A method of indicating channel state information (CSI) measurement and a communication device

Abstract

The application provides a channel state information (CSI) measurement indication method and a communication device. A network device indicates, to a terminal device, frequency domain units in a downlink reference signal resource for the terminal device to obtain the CSI through first indication information. Based on the first indication information, the terminal device can determine which frequency domain units in the downlink reference signal resource are used to obtain the CSI, and perform measurement based on the frequency domain units, and the obtained CSI is measured on the frequency domain units. The network device can flexibly configure the CSI measurement according to a system state, so as to control the acquisition of the CSI. Therefore, the terminal device can be more targeted in CSI acquisition under different conditions based on the indication.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wireless communication, and more particularly, to a method for indicating channel state information (CSI) measurement and a communication device. BACKGROUND

[0002] In massive multiple-input multiple output (Massive MIMO) technology, a network device can reduce interference between multiple users and interference between multiple signal streams of the same user through precoding technology, so as to improve signal quality, realize spatial division multiplexing, and improve spectrum utilization. Therefore, acquisition of at least one channel state information (CSI), such as a precoding matrix indicator (PMI) and a channel quality indicator (CQI), is particularly important.

[0003] A terminal device may, for example, determine a precoding matrix based on downlink channel measurement, and hopes to obtain, through feedback, a precoding matrix that is the same as or similar to the precoding matrix determined by the terminal device. Specifically, the terminal device may, for example, indicate construction of a precoding matrix by feeding back one or more spatial domain vectors, one or more frequency domain vectors, and one or more weighting coefficients.

[0004] Under beamforming technology, a network device transmits corresponding downlink reference signals, such as channel state information–reference signals (CSI-RS), to different user equipment (UE) for channel measurement, and obtains CSI measured by the UE to reconstruct a downlink channel or precoding. However, when a base station needs to obtain CSI of a large number of UEs, the communication overhead will be very large, and it is not possible to flexibly control the performance of the CSI acquisition scheme. SUMMARY

[0005] The present application provides a method for indicating channel state information (CSI) measurement and a communication device, so as to flexibly control CSI measurement.

[0006] In a first aspect, a method for indicating channel state information (CSI) measurement is provided. The method can be executed by a terminal device, or can also be executed by a component (such as a chip or a chip system) configured in the terminal device.

[0007] Specifically, the method comprises: receiving first indication information, the first indication information being used for indicating a frequency domain unit in a downlink reference signal resource for a terminal device to obtain the CSI; and measuring the CSI based on the first indication information.

[0008] Based on the above technical solution, the network device can flexibly configure the CSI measurement according to the system state (for example, the reference signal port, the system bandwidth, the scheduling bandwidth, the measurement bandwidth, the resource utilization, the transmission power, etc.), so as to control the acquisition of the CSI. Thus, it is beneficial for the terminal device to more targetedly perform the CSI acquisition in different cases based on the indication.

[0009] It should be understood that the measurement of the CSI on the frequency domain unit can be that the terminal device processes the measurement result on the frequency domain unit for obtaining the CSI in an accumulated manner to obtain the CSI; or the terminal device can obtain the CSI by performing Fast Fourier Transform (FFT) or Inverse Fast Fourier Transform (IFFT) on the frequency domain unit, taking the direct current component. Specifically, the terminal device performs channel estimation on the received CSI-RS based on the indication of the network device, then performs IFFT / FFT on the channel estimation result corresponding to the frequency domain unit, and finally takes the n-th point after the IFFT / FFT as the measurement result, for example, takes the 0-th point (i.e., the direct current component) as the measurement result; or other processing, which is not limited in the present application, as long as the technical solution of measuring and obtaining the CSI based on the indicated frequency domain unit falls within the protection scope of the present application.

[0010] In a second aspect, a method for indicating channel state information (CSI) measurement is provided. The method can be performed by a network device or a component (such as a chip or a chip system) configured in the network device.

[0011] Specifically, the method comprises: generating first indication information, the first indication information being used for indicating a frequency domain unit in a downlink reference signal resource for a terminal device to obtain the CSI; and sending the first indication information.

[0012] Based on the above technical solution, the network device can flexibly configure the CSI measurement according to the system state (for example, the reference signal port, the system bandwidth, the scheduling bandwidth, the measurement bandwidth, the resource utilization, the transmission power, etc.), so as to control the acquisition of the CSI. Thus, it is beneficial for the terminal device to more targetedly perform the CSI acquisition in different cases based on the indication.

[0013] In a possible implementation of the first aspect or the second aspect, the first indication information comprises second indication information used for indicating a starting frequency domain unit in the frequency domain units. It can be understood that, through indication of the second indication information, the starting frequency domain unit in the frequency domain units used by the terminal device to obtain the CSI can be determined. The starting frequency domain unit can be indicated by its position or identifier. The position of the starting frequency domain unit can be its relative position in the downlink reference signal resource or its absolute position in the system. The identifier of the starting frequency domain unit can be its relative identifier in the downlink reference signal resource or its absolute identifier in the system.

[0014] In a possible implementation of the first aspect or the second aspect, a distribution density of the frequency domain units used by the terminal device to obtain the CSI in the downlink reference signal resource is preset as being distributed every P frequency domain units, where P is an integer greater than or equal to 0. It can be understood that, if the distribution density of the frequency domain units used by the terminal device to obtain the CSI in the downlink reference signal resource is preset, through indication of the second indication information, not only the starting frequency domain unit in the frequency domain units used by the terminal device to obtain the CSI can be determined, but also the remaining frequency domain units in the frequency domain units can be determined.

[0015] In a possible implementation of the first aspect or the second aspect, the first indication information further comprises third indication information used for indicating a distribution density of the frequency domain units in the downlink reference signal resource. It can be understood that, the distribution density can also be flexibly configured through indication. Through indication of the third indication information, not only the starting frequency domain unit in the frequency domain units used by the terminal device to obtain the CSI can be determined, but also the remaining frequency domain units in the frequency domain units can be determined.

[0016] In a possible implementation of the first aspect or the second aspect, the first indication information comprises fourth indication information used for indicating a number of groups of the frequency domain units divided into groups.

[0017] In a possible implementation of the first aspect or the second aspect, each of the groups of the frequency domain units corresponds to different downlink reference signal ports. It can be understood that, through the fourth indication information, a number of groups of the frequency domain units used by the terminal device to obtain the CSI in the downlink reference signal resource can be determined. According to that each of the groups of the frequency domain units corresponds to different downlink reference signal ports, a number of groups of the downlink reference signal ports can be determined.

[0018] In a possible implementation of the first aspect or the second aspect, each of the groups of the frequency domain units corresponds to the same downlink reference signal port.

[0019] In a possible implementation of the first aspect or the second aspect, the first indication information further includes sixth indication information, where the sixth indication information is used to indicate a frequency domain unit that is a start of a first group of the groups of frequency domain units. It can be understood that if the division of the groups of frequency domain units for obtaining CSI is not fixed to start from a first frequency domain unit in all frequency domain units of the downlink reference signal resource, the sixth indication information can be used to flexibly configure the frequency domain position of the groups of frequency domain units for obtaining CSI.

[0020] In a possible implementation of the first aspect or the second aspect, the first indication information further includes sixth indication information, where the sixth indication information is used to indicate a frequency domain unit that is a start of a first group of the groups of frequency domain units. It can be understood that if the division of the groups of frequency domain units for obtaining CSI is not fixed to start from a first frequency domain unit in all frequency domain units of the downlink reference signal resource, the sixth indication information can be used to flexibly configure the frequency domain position of the groups of frequency domain units for obtaining CSI.

[0021] In a possible implementation of the first aspect or the second aspect, a distribution density of the frequency domain units in each of the groups of frequency domain units in the downlink reference signal resource is preset to be distributed every P frequency domain units, where P is an integer greater than or equal to 0. It can be understood that if P = 0, the distribution density of the frequency domain units for obtaining CSI in the downlink reference signal resource is preset to be distributed without interval, and it can be determined that the frequency domain units in each group of the groups of frequency domain units are adjacent to each other in the downlink reference signal resource; if the distribution density is preset to be distributed every P frequency domain units, and it is assumed that P = 1, it can be determined that the frequency domain units in each group of the groups of frequency domain units are separated by one frequency domain unit in the downlink reference signal resource.

[0022] In a possible implementation of the first aspect or the second aspect, the first indication information further includes seventh indication information, where the seventh indication information is used to indicate a frequency domain unit that is a start of a group of the groups of frequency domain units other than the first group; or the frequency domain unit that is the start of the group of the groups of frequency domain units other than the first group is preset to satisfy a predetermined condition. It can be understood that the frequency domain unit that is the start of the group of the groups of frequency domain units other than the first group can be indicated by signaling or predefined.

[0023] In a possible implementation of the first aspect or the second aspect, the predetermined condition is:

[0024] (G i + R0) mod M,

[0025] where G i is a group number of the groups of frequency domain units, i = 0, 1, 2,..., M; R0 is a frequency domain unit identifier of a frequency domain unit that is a start of a first group of the groups of frequency domain units; M is a group number of the groups of frequency domain units. mod represents (Gi + R0) divided by M. It can be understood that through the above predetermined conditions, the unit identifier of the frequency domain unit actually in the remaining group can be determined, thereby determining the frequency domain unit where the remaining group starts.

[0026] It should be understood that through all the above indication manners, compared with directly indicating each frequency domain unit through different values of the corresponding field, the indication overhead can be saved to a certain extent.

[0027] In conjunction with the first aspect or the second aspect, in some possible implementation manners, the first indication information indicates the frequency domain unit by indicating the identifier or the location of the frequency domain unit. It can be understood that, without considering the indication overhead, the frequency domain unit in the downlink reference signal resource for the terminal device to obtain the CSI can be directly indicated.

[0028] In conjunction with the first aspect or the second aspect, in some possible implementation manners, the first indication information includes at least one of the following: indication information for indicating a measurement bandwidth, indication information for indicating a downlink reference signal port number, and indication information for indicating a CSI acquisition scheme based on angle and time delay reciprocity. At least one of these information can be indicated through the first indication information, thereby implicitly indicating the frequency domain unit in the downlink reference signal resource for the terminal device to obtain the CSI.

[0029] In conjunction with the first aspect or the second aspect, in some possible implementation manners, at least one of the following is pre-set or indicated through the ninth indication information: a correspondence between the measurement bandwidth and the number of groups of the frequency domain unit divided into frequency domain unit groups; a correspondence between the measurement bandwidth and the distribution density of the frequency domain unit; a correspondence between the downlink reference signal port number and the number of groups of the frequency domain unit; a correspondence between the downlink reference signal port number and the distribution density of the frequency domain unit; a frequency domain unit where the first group starts; a frequency domain unit where the remaining group other than the first group starts; the distribution density of each group of frequency domain units; the distribution density of the frequency domain unit; and a frequency domain unit where the first group starts.

[0030] In conjunction with the first aspect or the second aspect, in some possible implementation manners, the frequency domain unit is a resource block (RB), a subband, a subcarrier, or a bandwidth part (BWP). It can be understood that the definition of the frequency domain unit can be implemented in different angles or different units.

[0031] In conjunction with the first aspect or the second aspect, in some possible implementation manners, the first indication information is carried in the subband reporting configuration CSI-ReportingBand. It can be understood that the first indication information can be sent through a newly defined field, or can be sent by multiplexing an existing field, and the interpretation of different values of the field is redefined.

[0032] It should be understood that the first indication information described above can be delivered through one signaling or delivered through multiple signaling, i.e., the first indication information includes second indication information, third indication information, fourth indication information, fifth indication information, sixth indication information, and seventh indication information, which are carried in multiple signaling.

[0033] It should be understood that the first indication information, the second indication information, the third indication information, the fourth indication information, the fifth indication information, the sixth indication information, and the seventh indication information described above can be the same indication information or different indication information, i.e., the indication of the to-be-indicated information can be in a joint indication manner or in a separate independent indication manner.

[0034] It should be understood that the first indication information can be carried in at least one of the following: a radio resource control (RRC) message, a medium access control (MAC) control element (CE), and downlink control information (DCI). The signaling listed above is only an example and should not constitute any limitation on the present application. The present application does not limit the specific signaling used to carry the first indication information.

[0035] In a third aspect, a communication apparatus is provided. The communication apparatus includes various modules or units, e.g., a processing unit, a transceiver unit, for performing the method in any possible implementation of the first aspect.

[0036] In a fourth aspect, a communication apparatus is provided. The communication apparatus includes a processor. The processor is coupled with a memory and is configured to execute instructions in the memory to implement the method in any possible implementation of the first aspect. Optionally, the communication apparatus further includes the memory. Optionally, the communication apparatus further includes a communication interface, and the processor is coupled with the communication interface.

[0037] In an implementation, the communication apparatus is a terminal device. When the communication apparatus is a terminal device, the communication interface can be a transceiver, or an input / output interface. Optionally, the transceiver can be a transceiver circuit, a receiver, a receiving circuit, a transmitter, a transmitting circuit, etc. Optionally, the input / output interface can be an input / output circuit.

[0038] In another implementation, the communication apparatus is a chip configured in a terminal device. When the communication apparatus is a chip configured in a terminal device, the communication interface can be an input / output interface, an input / output circuit, an input / output pin, etc., and the processor can be a processing circuit, a logic circuit, etc.

[0039] In a fifth aspect, a communication apparatus is provided. The communication apparatus includes various modules or units, e.g., a processing unit, a transceiving unit, for performing the method in any possible implementation of the second aspect.

[0040] In a sixth aspect, a communication apparatus is provided. The communication apparatus includes a processor. The processor is coupled to a memory and is configured to execute instructions stored in the memory to implement the method in any possible implementation of the second aspect. Optionally, the communication apparatus further includes the memory. Optionally, the communication apparatus further includes a communication interface, and the processor is coupled to the communication interface.

[0041] In an implementation, the communication apparatus is a terminal device. When the communication apparatus is a terminal device, the communication interface can be a transceiver, or an input / output interface. Optionally, the transceiver can be a transceiving circuit, a receiver, a receiving circuit, a transmitter, a transmitting circuit, etc. Optionally, the input / output interface can be an input / output circuit.

[0042] In another implementation, the communication apparatus is a chip configured in a terminal device. When the communication apparatus is a chip configured in a terminal device, the communication interface can be an input / output interface, an input / output circuit, an input / output pin, etc., and the processor can be a processing circuit, a logic circuit, etc.

[0043] In a seventh aspect, a processor is provided, including an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method in any possible implementation of the first aspect and the second aspect.

[0044] In a specific implementation, the processor can be one or more chips, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits, etc. The input signal received by the input circuit can be received and input by, for example but not limited to, a receiver, the output signal output by the output circuit can be output to and transmitted by, for example but not limited to, a transmitter, and the input circuit and the output circuit can be the same circuit which is used as the input circuit and the output circuit at different times. The embodiments of the present application do not limit the specific implementation of the processor and various circuits.

[0045] In an eighth aspect, a processing apparatus is provided, including a processor and a memory. The processor is configured to read instructions stored in the memory and can receive a signal through a receiver and transmit a signal through a transmitter to perform the method in any possible implementation of the first aspect and the second aspect.

[0046] Optionally, the processor is one or more, and the memory is one or more.

[0047] Optionally, the memory can be integrated with the processor, or the memory and the processor are separately arranged.

[0048] In the implementation process, the memory can be a non-transitory memory, such as a read only memory (ROM), which can be integrated on the same chip with the processor, or arranged on different chips respectively. The type of the memory and the arrangement manner of the memory and the processor are not limited in the embodiments of the present application.

[0049] It should be understood that the related data interaction process, such as sending indication information, can be the process of outputting indication information from the processor, and receiving capability information can be the process of receiving input capability information by the processor. Specifically, the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver. Wherein, the transmitter and the receiver can be collectively referred to as a transceiver.

[0050] The processing device in the eighth aspect can be one or more chips. The processor in the processing device can be implemented by hardware or software. When implemented by hardware, the processor can be a logic circuit, an integrated circuit, etc. When implemented by software, the processor can be a general-purpose processor, which realizes by reading software code stored in the memory. The memory can be integrated in the processor, or exist independently outside the processor.

[0051] In the ninth aspect, a computer program product is provided, which includes a computer program (also referred to as code or instruction), which, when executed, causes a computer to execute the method in any possible implementation manner of the first aspect and the second aspect.

[0052] In the tenth aspect, a computer readable medium is provided, which stores a computer program (also referred to as code or instruction), which, when executed on a computer, causes the computer to execute the method in any possible implementation manner of the first aspect and the second aspect.

[0053] In the eleventh aspect, a communication system is provided, which includes the network device and the terminal device as described above. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is an architecture schematic diagram of a communication system suitable for the indication method of channel state information (CSI) measurement provided in the embodiments of the present application;

[0055] Figure 2 is a schematic flowchart of a method for indicating channel state information (CSI) measurement provided by embodiments of the present application

[0056] Figure 3 is a schematic diagram of a frequency domain unit of a downlink reference signal resource provided by embodiments of the present application

[0057] Figure 4 is a schematic block diagram of a communication device provided by embodiments of the present application

[0058] Figure 5 is a schematic block diagram of a terminal device provided by embodiments of the present application

[0059] Figure 6 is a schematic block diagram of a network device provided by embodiments of the present application DETAILED DESCRIPTION

[0060] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0061] The technical solutions of embodiments of the present application can be applied to various communication systems, for example: a Long Term Evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD), a universal mobile telecommunication system (UMTS), a worldwide interoperability for microwave access (WiMAX) communication system, a future 5th Generation (5G) mobile communication system or a new radio Access Technology (NR). The 5G mobile communication system can include non-standalone (NSA) and / or standalone (SA).

[0062] The technical solutions provided in the application can also be applied to machine type communication (MTC), Long Term Evolution-machine (LTE-M), device-to-device (D2D) network, machine to machine (M2M) network, internet of things (IoT) network or other network. The IoT network may, for example, include a vehicle network. In the vehicle network system, the communication modes are collectively referred to as vehicle to X (V2X, X can represent any object), for example, the V2X can include vehicle to vehicle (V2V) communication, vehicle to infrastructure (V2I) communication, vehicle to pedestrian (V2P) communication or vehicle to network (V2N) communication, etc.

[0063] The technical solutions provided in the application can also be applied to future communication systems, such as a 6th Generation (6G) mobile communication system. The application is not limited in this regard.

[0064] In this embodiment of the application, the network device can be any device with wireless transceiver capabilities. This equipment includes, but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC), base transceiver station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP) in a wireless fidelity (WiFi) system. It can also be a gNB in ​​a 5G system, such as NR, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or transmission point, such as a baseband unit (BBU), or a distributed unit (DU), or a base station in a next-generation communication 6G system.

[0065] In some deployments, a gNB can include a centralized unit (CU) and a DU. The gNB can also include an active antenna unit (AAU). The CU implements part of the functions of the gNB, and the DU implements part of the functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services, implements the radio resource control (RRC), and the functions of the packet data convergence protocol (PDCP) layer. The DU is responsible for processing the physical layer protocol and real-time services, and implements the functions of the radio link control (RLC) layer, the medium access control (MAC) layer, and the physical (PHY) layer. The AAU implements part of the physical layer processing functions, radio frequency processing, and related functions of the active antenna. Since the information of the RRC layer eventually becomes the information of the PHY layer, or is converted from the information of the PHY layer, under this architecture, high-layer signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or being sent by the DU and the AAU. It can be understood that the network device can be a device including one or more of the CU node, the DU node, and the AAU node. In addition, the CU can be divided into a network device in the radio access network (RAN), or can be divided into a network device in the core network (CN), which is not limited in the present application.

[0066] The network device provides services for a cell, and a terminal device communicates with the cell through transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network device. The cell can belong to a macro base station (for example, a macro eNB or a macro gNB, etc.), or a base station corresponding to a small cell. The small cell can include a metro cell, a micro cell, a pico cell, a femto cell, etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services.

[0067] In the embodiments of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus.

[0068] The terminal device can be a device providing voice / data connectivity to a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals can be: a mobile phone, a pad, a computer (such as a notebook computer, a palm computer, etc.) with wireless transceiver function, a mobile internet device (MID), a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc.

[0069] Among them, the wearable device can also be called a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also a powerful function realized through software support and data interaction, cloud interaction. The general wearable smart device includes functions, large size, and can realize complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, and focuses on a certain application function and needs to cooperate with other devices such as a smart phone, such as various smart wristbands and smart jewelry for monitoring vital signs.

[0070] In addition, the terminal device can also be a terminal device in an internet of things (IoT) system. The IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of man-machine interconnection and object-object interconnection. IoT technology can achieve massive connection, deep coverage and terminal power saving through, for example, narrowband (NB) technology.

[0071] In addition, the terminal device can also include intelligent printers, train detectors, gas station sensors, and the like, and the main functions include collecting data (for some terminal devices), receiving control information and downlink data of network devices, and transmitting electromagnetic waves to transmit uplink data to network devices.

[0072] To facilitate understanding of the embodiments of the present application, the terms involved in the embodiments of the present application are briefly introduced below.

[0073] 1. Precoding: The network device can process the to-be-sent signal by means of a precoding matrix matched with the channel state in the case of known channel state, so that the to-be-sent signal after precoding is adapted to the channel, thereby reducing the complexity of the receiving device to eliminate the influence between channels. Therefore, through precoding processing of the to-be-sent signal, the receiving signal quality (such as signal to interference plus noise ratio (SINR) and the like) is improved. Therefore, by using the precoding technology, the sending device and multiple receiving devices can transmit on the same time-frequency resource, that is, multiple user multiple input multiple output (MU-MIMO) is realized.

[0074] It should be understood that the related description of the precoding technology herein is only an example for the purpose of understanding, and is not intended to limit the protection scope of the embodiments of the present application. In the specific implementation process, the sending device can also perform precoding in other ways. For example, in the case where the channel information (such as but not limited to the channel matrix) cannot be obtained, a pre-set precoding matrix or weighting processing method is used for precoding. For the sake of brevity, the specific content is not described herein.

[0075] 2、Channel reciprocity: In some communication modes, such as time division duplexing (TDD), the uplink and downlink channels transmit signals on different time domain resources on the same frequency domain resource. Within a relatively short time (such as the coherence time of channel propagation), it can be considered that the channel fading experienced by the signals on the uplink and downlink channels is the same. This is the reciprocity of the uplink and downlink channels. Based on the reciprocity of the uplink and downlink channels, the network device can measure the uplink channel according to the uplink reference signal, such as the sounding reference signal (SRS). And can estimate the downlink channel according to the uplink channel, so as to determine the precoding matrix for downlink transmission.

[0076] However, in some other communication modes, such as frequency division duplexing (FDD), due to the frequency band interval of the uplink and downlink channels being much larger than the coherence bandwidth, the uplink and downlink channels do not have complete reciprocity, and using the uplink channel to determine the precoding matrix for downlink transmission may not be able to adapt to the downlink channel. However, the uplink and downlink channels in the FDD mode still have partial reciprocity, for example, angular reciprocity and delay reciprocity. Therefore, the angle and the delay can also be referred to as reciprocity parameters.

[0077] When a signal is transmitted through a wireless channel, it can pass through multiple paths from the transmitting antenna to the receiving antenna. The multipath delay causes frequency selective fading, that is, the variation of the frequency domain channel. The delay is the transmission time of the wireless signal on different transmission paths, which is determined by the distance and speed, and has nothing to do with the frequency domain of the wireless signal. When the signal is transmitted on different transmission paths, there are different transmission delays due to different distances. Since the physical positions between the network device and the terminal device are fixed, the multipath distribution of the uplink and downlink channels is the same in delay. Therefore, the delay of the uplink and downlink channels in the FDD mode can be considered the same, or in other words, reciprocal.

[0078] In addition, the angle can refer to the angle of arrival (AOA) of the signal arriving at the receiving antenna via the wireless channel, or the angle of departure (AOD) of the signal transmitted by the transmitting antenna. In the embodiments of the present application, the angle can refer to the angle of arrival of the uplink signal at the network device, or the angle of departure of the downlink signal transmitted by the network device. Due to the reciprocity of the transmission paths of the uplink and downlink channels at different frequencies, the angle of arrival of the uplink reference signal and the angle of departure of the downlink reference signal can be considered reciprocal.

[0079] Optionally, each angle can be represented by an angle vector. Each time delay can be represented by a time delay vector. Therefore, in the embodiments of the present application, an angle vector can represent an angle, and a time delay vector can represent a time delay.

[0080] 3、Reference signal (RS): The reference signal can also be referred to as a pilot, a reference sequence, etc. In the embodiments of the present application, the reference signal can be a reference signal for channel measurement. For example, the reference signal can be a channel state information reference signal (CSI-RS) for downlink channel measurement, a synchronization signal block (ss / pbch block, SSB for short). It should be understood that the reference signals listed above are only examples and should not constitute any limitation on the present application. The present application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0081] In the embodiments of the present application, the reference signal includes a precoded reference signal and a non-precoded reference signal. The precoded reference signal can be a reference signal obtained after precoding. The precoding can specifically include beamforming and / or phase rotation. The beamforming can be implemented, for example, by precoding the downlink reference signal based on one or more angle vectors, and the phase rotation can be implemented, for example, by precoding the downlink reference signal based on one or more time delay vectors.

[0082] In the embodiments of the present application, precoding the downlink reference signal based on one or more angle vectors can also be referred to as loading one or more angle vectors onto the downlink reference signal to implement beamforming. Precoding the downlink reference signal based on one or more time delay vectors can also be referred to as loading one or more time delay vectors onto the downlink reference signal to implement phase rotation.

[0083] 4、Port: It can include a sending port (or transmitting port) and / or a receiving port.

[0084] The transmission port can be understood as a virtual antenna identified by the receiving device. It is a logical meaning, and one antenna port can be configured for each virtual antenna. Each virtual antenna can be a weighted combination of multiple physical antennas, and each antenna port can correspond to one reference signal port. The antenna port is used to carry at least one of a specific physical channel and a physical signal. The signals transmitted through the same antenna port can be considered to experience the same or related channels (such as large-scale channel characteristics, such as channel matrix H, the same) regardless of whether the signals are transmitted through the same or different physical antennas. That is, the signals transmitted through the same antenna port can be considered to have the same or related channels when demodulated by the receiving end. That is, the antenna port defines the channel at a certain symbol, and the antenna ports of two symbols are the same, which means that the channel at one symbol can be inferred from the channel at another symbol.

[0085] Optionally, the transmission port is a port after beamforming and phase rotation. For example, the reference signal of each transmission port can be a precoded reference signal obtained by precoding the reference signal based on an angle vector and a time delay vector. The transmission port can also be referred to as the port of the precoded reference signal.

[0086] The reference signal of each transmission port can be transmitted through one or more frequency domain units.

[0087] The receiving port can be understood as the receiving antenna of the receiving device. For example, in downlink transmission, the receiving port can refer to the receiving antenna of the terminal device.

[0088] 5. Channel state information (CSI): can include at least one of the following information: channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator, SS / PBCH block resource indicator (SSBRI), layer indicator (LI), rank indicator (RI), reference signal received power (RSRP). RSRP can be layer 1 RSRP (L1-RSRP). In this application, the channel state information can also include synchronization measurement results or indication information of synchronization measurement results.

[0089] 6、Frequency domain unit: occupies a certain bandwidth in the frequency domain, and includes different types corresponding to different division units, including but not limited to resource blocks (RBs), subbands, subcarriers, and bandwidth parts (BWPs).

[0090] 7、Angle vector: can be understood as a precoding vector used for beamforming a reference signal. Through beamforming, the reference signal transmitted by the transmitting device can have a certain spatial directivity. Therefore, the process of precoding the reference signal based on the angle vector can also be regarded as a process of spatial domain (or simply, spatial) precoding. Therefore, the angle vector can also be referred to as a spatial domain vector, a beam vector, etc.

[0091] The number of ports of the precoded reference signal obtained after precoding the reference signal based on one or more angle vectors is the same as the number of angle vectors. When the number of angle vectors K is less than the number of transmitting antenna ports T in one polarization direction, the dimensionality reduction of the antenna ports can be achieved through spatial domain precoding, thereby reducing the pilot overhead. Wherein K≥1, T≥1, and K, T are integers.

[0092] The angle vector can be a vector with a length of T.

[0093] Optionally, the angle vector is a Discrete Fourier Transform (DFT) vector. The DFT vector can refer to a vector in a DFT matrix.

[0094] Optionally, the angle vector is a conjugate transpose vector of the DFT vector. The DFT conjugate transpose vector can refer to a column vector in a conjugate transpose matrix of the DFT matrix.

[0095] Optionally, the angle vector is an oversampled DFT vector. The oversampled DFT vector can refer to a vector in an oversampled DFT matrix.

[0096] In a possible design, the angle vector may, for example, be a 2 dimensions (2D)-DFT vector v defined in a type II codebook in the NR protocol TS 38.214 version 15 (release 15, R15) l,m In other words, the angle vector can be a 2D-DFT vector or an oversampled 2D-DFT vector.

[0097] An example of a 2D-DFT vector is shown below.

[0098]

[0099] As

[0100] wherein I1 is the number of antenna ports with the same polarization direction contained in each column (or row) of the antenna array, and I2 is the number of antenna ports with the same polarization direction contained in each row (or column) of the antenna array. In this embodiment, T = I1 x I2. O1 and O2 are oversampling factors. i1 and i2 satisfy 0≤i1≤(O1×I1-1), 0≤i2≤(O2×I2-1).

[0101] Optionally, the angle vector is a steering vector of a uniform linear array (ULA). For example, wherein θ k is an angle, k = 1, 2, …, K. K represents the number of angle vectors; λ is a wavelength, and d is an antenna spacing.

[0102] wherein the steering vector can represent a phase difference existing in the response of a radial angle of arrival at different antennas. The steering vector a(θ k ) satisfies:

[0103] Optionally, the angle vector is a steering vector of a uniform plane array (UPA). The steering vector may, for example, be a steering vector containing horizontal angle and elevation angle information. For example, wherein θ k is a horizontal angle, is an elevation angle; ρ t is a three-dimensional coordinate of the t-th transmitting antenna port, t = 1, 2, …, T; u k is a unit spherical basis vector corresponding to the k-th angle:

[0104] Hereinafter, the angle vector is denoted as a(θ k ).

[0105] In downlink transmission, since the reference signal loaded with the angle vector can be transmitted to the terminal device through the downlink channel, the channel measured by the terminal device according to the received precoding reference signal is equivalent to the channel loaded with the angle vector. For example, the angle vector a(θ k ) is loaded to the downlink channel V, which can be represented as Va(θ k ).

[0106] ​Assume that the transmitting device is configured with a single polarization antenna, the number of transmitting antenna ports is T, the number of frequency domain units is N, N≥1, and N is an integer. For a receiving port of the receiving device, the channel estimated based on the received reference signal can be a matrix with a dimension of N×T. If the reference signal is spatially precoded based on an angle vector, the angle vector can be loaded on the reference signal respectively. Since the dimension of the angle vector is T×1, for a receiving port of the receiving device, the dimension of the channel estimated based on the precoded reference signal can be N×1. And on each receiving port and each frequency domain unit, the dimension of the channel estimated by the terminal device based on the received precoded reference signal can be 1×1.

[0107] It should be understood that the angle vector is a form proposed by the present application for representing an angle. The angle vector is named only for the convenience of distinguishing from the time delay, and should not constitute any limitation on the present application. The present application does not exclude the possibility of defining other names to represent the same or similar meanings in future protocols.

[0108] 8. Time delay vector: can also be called frequency domain vector. The time delay vector can be used to represent the vector of the variation of the channel in the frequency domain. As described above, the multipath time delay causes frequency selective fading. It can be known from Fourier transform that the time delay of a signal in the time domain can be equivalent to the phase rotation in the frequency domain.

[0109] For example, for a signal g(t), the signal can be transformed into the frequency domain by Fourier transform: For a signal g(t-t0), the signal can be transformed into the frequency domain by Fourier transform: Where ω is the frequency variable, different frequencies correspond to different phase rotations; t and t-t0 represent time delays.

[0110] The two time delay signals can be represented as x(t)=g(t)+g(t-t0), and thus the function of the frequency variable can be obtained Let g(ω)≡1, and the following can be obtained Therefore, the two different time delay signals cause frequency domain selective fading.

[0111] Since the phase variation of the channel in each frequency domain unit is related to the time delay, the variation of the phase of the channel in each frequency domain unit can be represented by a time delay vector. In other words, the time delay vector can be used to represent the time delay characteristics of the channel.

[0112] The precoding of the reference signal based on the time delay vector can essentially mean that the phase of each frequency domain unit in the frequency domain is rotated based on the elements in the time delay vector, so as to pre-compensate the frequency selective characteristics caused by the multipath time delay through the precoded reference signal. Therefore, the process of precoding the reference signal based on the time delay vector can be regarded as the process of frequency domain precoding.

[0113] Pre-coding the reference signal based on different delay vectors is equivalent to phase rotating each frequency domain unit of the channel based on different delay vectors. Moreover, the phase rotation angle of the same frequency domain unit can be different. In order to distinguish different delays, the network device can pre-code the reference signal based on each delay vector in the L delay vectors respectively.

[0114] Optionally, the length of the delay vector is N, N can refer to the number of frequency domain units used to carry the reference signal (such as the reference signal without pre-coding or the reference signal with pre-coding), N≥1, and N is an integer.

[0115] Optionally, the lth delay vector in the L delay vectors can be expressed as b(τ l ), Wherein, l = 0, 1, …, L-1; L can represent the number of delay vectors; f0, f1, …, f N-1 respectively represent the carrier frequencies of the 0th, 1st to (N-1)th frequency domain units.

[0116] Optionally, the delay vector is taken from a DFT matrix. For example, Each vector in the DFT matrix can be referred to as a DFT vector.

[0117] Wherein, O f is an oversampling factor, O f ≥1; k is the index of the DFT vector, and satisfies 0≤k≤O f ×N-1 or 1-O f ×N≤k≤0.

[0118] For example, when k<0, b(τ l ) and the vector u k in the DFT matrix can satisfy:

[0119] b(τ l )=u k β l And Wherein Δf=f n -f n+1 , 1≤n≤N-1.

[0120] In the following, the delay vector is denoted as b(τ l ).

[0121] In the embodiments of the present application, for the convenience of understanding, the specific process of frequency domain precoding of the reference signal is described by taking a resource block (RB) as an example of a frequency domain unit. When taking the RB as an example of a frequency domain unit, it can be considered that each frequency domain unit only includes one RB (which can be referred to as a reference signal RB for short) for carrying the reference signal. In fact, each frequency domain unit can include one or more RBs for carrying the reference signal. When multiple RBs for carrying the reference signal are included in each frequency domain unit, the network device can load the delay vector on the multiple RBs for carrying the reference signal in each frequency domain unit.

[0122] In the downlink transmission, since the reference signal loaded with the delay vector can be transmitted to the terminal device through the downlink channel, the channel measured by the terminal device according to the received precoded reference signal is equivalent to the channel loaded with the delay vector. In an implementation manner, if the reference signal is frequency domain precoded based on a delay vector with a length of N, the N elements in the delay vector can be loaded on the reference signals carried on N resource blocks (RBs), respectively. The n th element in the delay vector is loaded on the channel V (n) For example, it can be represented as

[0123] It should be noted that the frequency domain precoding of the reference signal based on the delay vector can be performed before resource mapping or after resource mapping, which is not limited in the present application.

[0124] 9, Spatial-frequency matrix: in the embodiments of the present application, the spatial-frequency matrix is an intermediate quantity for determining the precoding matrix.

[0125] In the embodiments of the present application, the spatial-frequency matrix can be determined based on the receiving port or the transmission layer, so the spatial-frequency matrix can be determined by the weighted sum of one or more angle-delay pairs, and therefore the dimension of the spatial-frequency matrix can also be N x T.

[0126] If the spatial-frequency matrix is determined based on the receiving port, the spatial-frequency matrix can be referred to as the spatial-frequency matrix corresponding to the receiving port. The spatial-frequency matrix corresponding to the receiving port can be used to construct the downlink channel matrix of each frequency domain unit, and then the precoding matrix corresponding to each frequency domain unit can be determined. The channel matrix corresponding to a certain frequency domain unit can be, for example, the conjugate transpose of the matrix constructed by the column vectors corresponding to the same frequency domain unit in the spatial-frequency matrix corresponding to each receiving port. For example, the n th column vector in the spatial-frequency matrix corresponding to each receiving port is extracted, and the matrix with a dimension of T x R can be obtained by arranging the column vectors from left to right according to the order of the receiving ports, R represents the number of receiving ports, R≥1 and is an integer. The channel matrix of the n th frequency domain unit can be obtained by performing conjugate transpose on the matrix.(n) The relationship between the channel matrix and the spatial-frequency matrix will be described in detail below, and the detailed description of the relationship between the two will be omitted here.

[0127] If the spatial-frequency matrix is determined based on the transmission layers, the spatial-frequency matrix can be referred to as a spatial-frequency matrix corresponding to the transmission layers. The spatial-frequency matrix corresponding to the transmission layers can be directly used to determine the precoding matrix corresponding to each frequency domain unit. The precoding matrix corresponding to a certain frequency domain unit can be constructed by column vectors corresponding to the same frequency domain unit in the spatial-frequency matrix corresponding to each transmission layer, for example. For example, the nthcolumn vector in the spatial-frequency matrix corresponding to each transmission layer is extracted, and a matrix with a dimension of T x Z is obtained by arranging the column vectors from left to right in the order of the transmission layers, where Z represents the number of transmission layers, Z≥1 and is an integer. The matrix can be used as the precoding matrix W (n) .

[0128] It should be noted that the precoding matrix determined by the channel measurement method provided by the embodiments of the present application can be a precoding matrix directly used for downlink data transmission, or can be obtained by some beamforming method, for example, including zero forcing (ZF), minimum mean-squared error (MMSE), maximum signal-to-leakage-and-noise ratio (SLNR), etc., to obtain a precoding matrix finally used for downlink data transmission. The present application does not limit this. The precoding matrix involved in the following can refer to the precoding matrix determined based on the channel measurement method provided by the present application.

[0129] The relationship between the spatial-frequency matrix and the downlink channel matrix and the precoding matrix will be briefly described.

[0130] The spatial-frequency matrix is an intermediate quantity that can be used to construct a precoding matrix based on the frequency domain continuity of a channel. The spatial-frequency matrix H can satisfy: H = SCF H . Wherein, S represents a matrix constructed by one or more (for example, K, K is a positive integer) angle vectors, for example, S = [a(θ1) a(θ2) … a(θ K )], F represents a matrix constructed by one or more (for example, L, L is a positive integer) delay vectors, for example, F = [b(τ1) b(τ2) … b(τ L )], and C represents a coefficient matrix constructed by a weighting coefficient corresponding to each angle vector in the K angle vectors and each delay vector in the L delay vectors. Each element in C can represent a weighting coefficient of a corresponding angle vector pair.

[0131] In the FDD mode, due to the uplink-downlink channel reciprocity of the delay and the angle, the spatial-frequency matrix HUL H UL = SC UL F H H DL H DL = SC DL F H Therefore, in the embodiments of the present application, the coefficient matrix C corresponding to the downlink channel is determined and fed back through the downlink channel measurement, and thus the precoding matrix adapted to the downlink channel can be determined. DL

[0132] It is uniformly stated that F H is the conjugate transpose matrix of F.

[0133] In addition, in order to facilitate the understanding of the embodiments of the present application, the following points are explained.

[0134] First, for the convenience of understanding, the main parameters involved in the present application are simply explained as follows:

[0135] P: the number of interval frequency domain units, P is an integer greater than or equal to 0, for example, P = 3, indicating that there are 3 frequency domain units in the middle of the two designated frequency domain units. Among them, the two designated frequency domain units can be equivalent to the frequency domain units for the terminal to obtain CSI in the downlink reference signal resource indicated by the first indication information in the embodiments of the present application.

[0136] T: the number of sending ports, T is a positive integer;

[0137] M: the number of groups of frequency domain units, which contains the frequency domain units for the terminal to obtain CSI

[0138] R: the number of receiving ports, R is a positive integer;

[0139] N: the number of frequency domain units for carrying reference signals, N is a positive integer;

[0140] K: the number of angle vectors, K is a positive integer;

[0141] L: the number of delay vectors, L is a positive integer;

[0142] ​Secondly, in the embodiments of the present application, for the frequency domain unit identifier, it can be the identifier information (for example, ID number, identifier index, etc.) of the frequency domain unit, or the position information (for example, position ID, position index, etc.) of the frequency domain unit, as long as it can identify the frequency domain unit. The frequency domain unit identifier can start from number 0, indicating the first frequency domain unit. The indication of the frequency domain unit identifier is equivalent to the indication of the position information or the identifier information of the frequency domain unit, that is, the indication of the frequency domain unit. Similarly, the group number of the frequency domain unit group can also start from number 0, indicating the first frequency domain unit group.

[0143] It should be understood that the above settings are provided for the technical solutions of the embodiments of the present application for ease of description, and are not used to limit the scope of the present application.

[0144] Thirdly, the "group" in the present application includes the actual existing group concept, and can also include the virtual group for the convenience of description, which groups the objects with common characteristics together, and does not necessarily exist the actual group concept. It should be understood that the "group" can include one object or multiple objects.

[0145] Fourthly, the first, second, third, fourth, fifth, sixth, seventh and various numerical numbers in the present application are only for the convenience of description and do not limit the scope of the embodiments of the present application. For example, the objects indicated by the first, second, third, fourth, fifth, sixth and seventh can be the same object, partially same object, or different objects, such as the second information and the third information, which can refer to the same information or different information.

[0146] Fifthly, in the present application, "for indicating" can include direct indication and indirect indication. When describing that the indication information is used to indicate A, it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information.

[0147] The information indicated by the indication information is referred to as to-be-indicated information. In the implementation process, there are many ways to indicate the to-be-indicated information, for example, but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, specified by a protocol), thereby reducing the indication overhead to a certain extent. For example, the protocol specifies the distribution density of the frequency domain unit, and by directly indicating the starting frequency domain unit, the indication of other frequency domain units under the distribution density can be achieved. At the same time, the common part of each information can be identified and uniformly indicated to reduce the indication overhead caused by separately indicating the same information.

[0148] In addition, the specific indication manner can also be various existing indication manners, for example, but not limited to, the above-mentioned indication manners and various combinations thereof. The specific details of various indication manners can refer to the prior art, and will not be described herein. As can be seen from the above, for example, when multiple information of the same type needs to be indicated, the indication manners of different information can be different. In the implementation process, the required indication manner can be selected according to the specific needs, and the selected indication manner is not limited by the embodiments of the present application. In this way, the indication manner involved in the embodiments of the present application should be understood as covering various methods that can enable the to-be-indicated information to be known by the to-be-indicated party.

[0149] In addition, the to-be-indicated information can have other equivalent forms, for example, the indication of the number of groups of the frequency domain unit grouping can be represented as the number of groups of the downlink reference signal port grouping, and vice versa. For another example, the distribution density can be represented as a position or an identification incremental manner, a rule, and the like. The technical solutions provided by the embodiments of the present application should be understood as covering various forms. For example, part or all of the characteristics involved in the embodiments of the present application should be understood as covering various forms of the characteristics.

[0150] The indication information of the to-be-indicated information can be sent together as a whole, or can be sent separately in multiple sub-information, and the sending period and / or sending occasion of the sub-information can be the same or different. In addition, the indication information can be indicated separately or jointly, for example, can be indicated separately by different bit positions in a bitmap, or jointly indicated by several bit positions in the bitmap. The specific sending method is not limited in the present application. The sending period and / or sending occasion of the sub-information can be predefined, for example, predefined according to a protocol, or configured by the transmitting end device to the receiving end device. The configuration information can include, for example but not limited to, one or a combination of at least two of radio resource control signaling, media access control (MAC) layer signaling and physical layer signaling. The radio resource control signaling can be, for example, radio resource control (RRC) signaling; the MAC layer signaling can include, for example, MAC control element (CE); and the physical layer signaling can include, for example, downlink control information (DCI).

[0151] Sixth, the definitions of many characteristics (such as CSI, RB, subband, subcarrier, BWP, angle and delay, etc.) listed in the present application are only used to explain the function of the characteristics by way of example, and the detailed content can refer to the prior art.

[0152] Seventh, "preset", "pre-setting", "predetermined", "predefined" or "preconfigured" can be realized by pre-saving corresponding codes, tables or other ways that can be used to indicate related information in devices (such as terminal devices and network devices), and the specific implementation manner is not limited in the present application. The "saving" can mean saving in one or more memories. The one or more memories can be separately set, or integrated in the encoder or decoder, processor, or communication device. The one or more memories can be part of separate setting, and part of integrated in the decoder, processor, or communication device. The type of memory can be any form of storage medium, which is not limited in the present application.

[0153] Eighth, the "protocol" involved in the embodiments of the present application can refer to a standard protocol in the communication field, which can include, for example, LTE protocol, NR protocol and related protocols applied to future communication systems, which is not limited in the present application.

[0154] Ninth, "at least one" means one or more, "multiple" means two or more. "And / or" describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after it. "At least one of the following" or similar expressions means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple.

[0155] Tenth, in the embodiments of the present application, "when", "in the case of", "if" and "if" and other descriptions all refer to the objective situation that the device (such as a terminal device or a network device) will make corresponding processing, not limited to time, and does not require the device (such as a terminal device or a network device) to have a judgment action when implemented, nor does it mean that there are other limitations.

[0156] Eleventh, in the embodiments of the present application, the RB can be a physical resource block (PRB) or a common resource block (CRB). The present application does not limit this. The PRB is numbered with the starting position of the resource (such as the bandwidth part (BWP)) scheduled for the terminal device as the reference point, and the CRB is numbered with the starting position of the wideband as the reference point. For specific definitions of PRB and CRB, please refer to the prior art, and for the sake of brevity, they will not be described in detail here.

[0157] To facilitate understanding of the embodiments of the present application, first, in combination with Figure 1 The communication system suitable for the method provided by the embodiments of the present application is described in detail. Figure 1 A schematic diagram of a communication system 100 suitable for the method provided by the embodiments of the present application is shown. As shown, the communication system 100 can include at least one network device, such as Figure 1 The network device 101 in the 5G system shown in the figure; the communication system 100 can also include at least one terminal device, such as Figure 1The terminal devices 102 to 107 shown are illustrated. These terminal devices 102 to 107 can be mobile or fixed. One or more of the network device 101 and terminal devices 102 to 107 can communicate via a wireless link. Each network device can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area. For example, a network device can send configuration information to a terminal device, and the terminal device can send uplink data to the network device based on this configuration information; another example is that the network device can send downlink data to the terminal device. Therefore, Figure 1 The network device 101 and terminal devices 102 to 107 constitute a communication system.

[0158] Optionally, the terminal devices can communicate directly with each other. For example, direct communication between terminal devices can be achieved using D2D technology. As shown in the figure, terminal devices 105 and 106, and terminal devices 105 and 107 can communicate directly using D2D technology. Terminal devices 106 and 107 can communicate with terminal device 105 individually or simultaneously.

[0159] Terminal devices 105 to 107 can also communicate with network device 101 respectively. For example, they can communicate directly with network device 101, as shown in the figure where terminal devices 105 and 106 can communicate directly with network device 101; they can also communicate indirectly with network device 101, as shown in the figure where terminal device 107 communicates with network device 101 via terminal device 106.

[0160] It should be understood that Figure 1 An exemplary diagram illustrates a network device and multiple terminal devices, as well as communication links between the communication devices. Optionally, the communication system 100 may include multiple network devices, and the coverage area of ​​each network device may include other numbers of terminal devices, such as more or fewer terminal devices. This application does not limit this.

[0161] The aforementioned communication devices, such as Figure 1 The network device 101 and terminal devices 102 to 107 can be configured with multiple antennas. These multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. Additionally, each communication device also includes a transmitter chain and a receiver chain, which, as will be understood by those skilled in the art, may include multiple components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, or antennas) related to signal transmission and reception. Therefore, the network device and the terminal device can communicate via multi-antenna technology.

[0162] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, but the embodiments of this application are not limited thereto.

[0163] To facilitate understanding of the embodiments of this application, the processing of downlink signals at the physical layer before transmission is briefly described below. It should be understood that the downlink signal processing described below can be performed by a network device or by a chip configured within the network device. For ease of explanation, it will be collectively referred to as a network device below.

[0164] Network devices can process codewords on the physical channel. These codewords can be encoded bits (e.g., including channel coding). The codewords are scrambled to generate scrambled bits. The scrambled bits are then modulated to obtain modulation symbols. These modulation symbols are then layer-mapped to multiple layers, or transport layers. After layer mapping, the modulation symbols are precoded to obtain a precoded signal. The precoded signal is then mapped to multiple resource elements (REs). These REs are subsequently orthogonally multiplexed (OFDM) and transmitted through the antenna port.

[0165] To obtain channel state information (CSI) for the downlink channel, network device 101 can send downlink reference signals to each terminal device to perform channel measurement and interference measurement. Each terminal device reports CSI, including any one of the following: precoding matrix indicator (PMI), rank indicator (RI), and channel quality indicator (CQI). The PMI tells network device 101 the optimal precoding matrix for the current downlink transmission. The RI tells network device 101 the optimal layer for the current downlink transmission. The CQI indicates the modulation and coding scheme available after adopting the recommended RI and PMI to ensure that the bit error rate of downlink data reception does not exceed a predetermined value. CSI reporting can be done periodically or aperiodically; the difference between the two methods lies in the configuration or triggering of the reporting.

[0166] The reported CSI can also be used by the network device to reconstruct the downlink channel. For example, in some communication modes, such as frequency division duplex (FDD), the network device 101 first receives the sounding reference signal (SRS) sent by the terminal device (for example, the terminal device 102), and estimates the information (for example, angle information, time delay information, etc.) having reciprocity between the uplink and the downlink by using the uplink SRS. In order to obtain the channel reciprocity information based on the uplink channel, the base station side needs to project the uplink channel on a certain spatial domain basis (S) or frequency domain basis (F), as follows

[0167] H UL = SC UL F H

[0168] According to the size of the elements in the projected C UL , at least one column vector is selected from the S and F matrices, denoted as s and f; the network device 101 loads the obtained information (for example, s, which can be regarded as angle information, and f, which can be regarded as time delay information) having reciprocity between the uplink and the downlink onto the downlink reference signal, and notifies the terminal device to measure and feed back the supplementary information required by the network device 101; the terminal device estimates and feeds back the CSI (for example, C DL ) as the supplementary information (for example, the full-band or partial sub-band complex amplitude corresponding to each port) by using the downlink reference signal; and the network device uses the information (for example, s and f) having reciprocity between the uplink and the downlink and the CSI (for example, C DL ) to construct c DL according to s, f and C DL . In c DL , the non-zero elements come from C DL , and the specific positions are determined by s and f. Further, the network side can reconstruct the downlink channel according to H DL = Sc DL F H . The above FDD is only an example, and the present application is not limited to applicable scenarios.

[0169] It should be understood that the above-described process of processing the downlink signal is only an exemplary description, and should not constitute any limitation on the present application. The process of processing the downlink signal can refer to the prior art for details, and the detailed description of the specific process is omitted here for brevity.

[0170] The indication method of channel state information (CSI) measurement provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0171] It should be understood that the following is only for the convenience of understanding and illustration, and the embodiments are all exemplarily described in detail by taking the interaction between the terminal device and the network device as an example. However, this should not constitute any limitation on the execution subject of the method provided by the embodiments of the present application. For example, the terminal device shown in the following embodiments can be replaced by a component (such as a chip or a chip system) configured in the terminal device. The network device shown in the following embodiments can also be replaced by a component (such as a chip or a chip system) configured in the network device. This is by no means a limitation that the improvement in the system must be performed together on both sides of the interaction. The technical solutions proposed by the present application have improvement on each side of the system.

[0172] The embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application, as long as the execution subject can communicate according to the method provided by the embodiments of the present application by running a program in which the code of the method provided by the embodiments of the present application is recorded. For example, the execution subject of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute a program.

[0173] The following will be described in detail Figure 2 The method for indicating channel state information (CSI) measurement provided by the embodiments of the present application is described in detail. Figure 2 The method 200 shown is a schematic flowchart of the method for indicating channel state information (CSI) measurement provided by the embodiments of the present application from the perspective of device interaction. Figure 2 The method 200 shown can include steps 210 to 230. The steps in the method 200 will be described in detail below.

[0174] In step 210, the network device generates first indication information, which is used to indicate the frequency domain unit in the downlink reference signal resource for the terminal device to obtain CSI.

[0175] The network device can flexibly configure the frequency domain unit for the terminal device to perform CSI measurement in the downlink reference signal resource configured for the terminal device. The frequency domain unit can have different division units, such as RB as the frequency domain unit, subband as the frequency domain unit, subcarrier as the frequency domain unit, and BWP as the frequency domain unit.

[0176] As shown in the following table, Figure 3 The downlink reference signal resource configured by the network device for the terminal occupies 8 frequency domain units from the frequency domain, and the identification information (such as identification index) or position information (such as position index) of the 8 frequency domain units is from 0 to 7. It can be understood that, Figure 3 in the table is only an example, Figure 3The given example is that the following row reference signal resource is taken as a reference, the starting frequency domain unit (the first frequency domain unit) of the downlink reference signal resource is taken as frequency domain unit 0, and other frequency domain units are sequentially numbered relative to frequency domain unit 0; optionally, in the embodiment of the application, the frequency domain unit can also be determined according to the frequency domain position in the system in which the actual frequency domain unit is located, for example, the starting frequency domain unit (the first frequency domain unit) of the actual downlink reference signal resource is from the fourth frequency domain unit in the system (the position index is frequency domain unit 3), and other frequency domain units are also determined according to the frequency domain position in the system in which they are actually located. It can be understood that in different scenarios, the position information can be replaced by the identification information, or expressed by each other, that is, the position information can be expressed by the identification information, or the identification information can be expressed by the position information.

[0177] The network device indicates, through the first indication information, the frequency domain units used by the terminal device to obtain the CSI according to a preset rule considering factors such as system state (for example, reference signal port, system bandwidth, scheduling bandwidth, measurement bandwidth, resource utilization, transmission power, etc.), that is, the first indication information can indicate which frequency domain units in the downlink reference signal resource are used by the terminal device to perform measurement and / or calculation of the CSI. For example, the network device can indicate, through the first indication information, that the terminal device performs measurement and / or calculation of the CSI based on frequency domain units 2, 4, 6, 8, and 10.

[0178] The indication of the frequency domain units by the first indication information can include different manners such as direct indication, indirect indication, explicit indication, and implicit indication, and does not limit that the identification information, position information, or all related information of the frequency domain units must be carried in the first indication information. This will be described in detail below.

[0179] In step 220, the network device sends the first indication information to the terminal device; and the terminal device receives the first indication information sent by the network device.

[0180] The network device sends the first indication information to the terminal device to instruct the terminal device to more specifically acquire the CSI. In the embodiment of the application, the form of the indication information is not limited, and it can be indicated through different indication manners. It should be understood that the first indication information can be carried in at least one of the following: a radio resource control (RRC) message, a medium access control (MAC) control element (CE), and a downlink control information (DCI). The listed signaling is only an example, and should not constitute any limitation on the application.

[0181] In step 230, the terminal device measures the CSI based on the first indication information on the indicated frequency domain units.

[0182] The terminal device can determine the frequency domain unit for obtaining the CSI in the downlink reference signal resource according to the indication of the first indication information. The terminal device can obtain the CSI based on the frequency domain unit for obtaining the CSI for all downlink reference signal ports, so as to obtain the PMI and the like. The terminal device can also obtain the CSI based on the frequency domain unit for obtaining the CSI corresponding to each group of downlink reference signal ports. The division of the downlink reference signal port group will be described together when the indication mode is described below, and will not be described here.

[0183] The CSI can be measured on the frequency domain unit for obtaining the CSI. The terminal device can obtain the CSI by accumulating the measurement results on the frequency domain unit for CSI measurement. Specifically, the terminal device performs channel estimation on the received CSI-RS based on the indication of the base station, and then accumulates and sums the channel estimation results corresponding to the frequency domain unit to obtain the measurement result. The terminal device can also obtain the CSI by performing FFT or IFFT on the frequency domain unit and taking the direct current component. Specifically, the terminal device performs channel estimation on the received CSI-RS based on the indication of the network device, and then performs IFFT / FFT on the channel estimation results corresponding to the frequency domain unit, and finally takes the nth point after IFFT / FFT as the measurement result, for example, takes the 0th point (i.e. the direct current component) as the measurement result. Other processing methods are also possible, and the present application does not limit the processing method as long as the CSI is obtained based on the indicated frequency domain unit.

[0184] It should be understood that after obtaining the CSI, the terminal device can report the obtained CSI to the network device.

[0185] The following is a concentrated and exemplary introduction to the indication mode of the first indication information:

[0186] Mode one:

[0187] The first indication information includes second indication information for indicating the starting frequency domain unit in the frequency domain unit for obtaining the CSI. It can be understood that the starting frequency domain unit in the frequency domain unit for the terminal device to obtain the CSI can be determined through the indication of the second indication information. The starting frequency domain unit can be indicated by its position information or identification information. The position of the starting frequency domain unit can be its relative position in the downlink reference signal resource, or its absolute position in the system. The identification of the starting frequency domain unit can be its relative identification in the downlink reference signal resource, or its absolute identification in the system. For ease of description, it is assumed that the downlink reference signal resource only occupies Figure 3The identification information (such as an identification index) or the position information (such as a position index) of the 8 frequency domain units is from 0 to 7. For example, the position / identification of the frequency domain unit is its relative position / identification in the downlink reference signal resource, and the indication mode shown in Table 1 is used for illustration. It should be understood that the embodiments of the present application are not limited to the example mode of Table 1. It should be noted that in the first mode and all the modes mentioned below, the index is taken as an example to describe the identification information or the position information.

[0188] Table 1

[0189]

[0190] It should be understood that the indication of the starting frequency domain unit described above can represent the indication of the index, such as the indication interpretation in Table 1. For example, 0 represents the frequency domain unit with an index of 0, 1 represents the frequency domain unit with an index of 1, and so on. Alternatively, it can also represent the indication of the ranking of the frequency domain unit in the downlink reference signal resource. For example, 1 represents the first frequency domain unit in the downlink reference signal resource, which is the frequency domain unit with an index of 0. The indication interpretation is not limited in the present application.

[0191] It can be seen that through the indication of the second indication information, the terminal device can at least determine the starting frequency domain unit in the frequency domain unit used to obtain the CSI. If it is agreed in advance that the frequency domain unit used to obtain the CSI is from the starting frequency domain unit to the last frequency domain unit occupied by the downlink reference signal resource by default, then if the second indication information takes the value of 010, through the indication of the second indication information, it can be determined that the frequency domain unit used to obtain the CSI is the frequency domain unit with an index of 2, 3, 4, 5, 6, and 7.

[0192] Further, the distribution density of the frequency domain units for obtaining CSI in the downlink reference signal resource can be preset in a pre-agreed manner, such as agreement by protocol. For example, the distribution density is distribution every P frequency domain units, and P is an integer greater than or equal to 0. It can be understood that, if the distribution density of the frequency domain units for obtaining CSI in the downlink reference signal resource is pre-agreed, all the frequency domain units for obtaining CSI can be determined by the indication of the second indication information. For example, the second indication information takes a value of 010, and the agreement specifies that the frequency domain units for obtaining CSI are either the frequency domain units with odd index information or position information or the frequency domain units with even index information, which means that the distribution density is distribution every 1 frequency domain unit, i.e., P = 1. It can be understood that the odd index and the even index herein can be based on relative index or absolute index, which is only an example of a rule. Then, by the indication of the second indication information 010, the frequency domain units for obtaining CSI can be determined as the frequency domain units with indexes of 2, 4, and 6. For another example, the second indication information takes a value of 001, and the agreement specifies that P = 2. Then, by the indication of the second indication information 001, the frequency domain units for obtaining CSI can be determined as the frequency domain units with indexes of 1, 4, and 7.

[0193] It should be understood that the definition of the distribution density can be different. For example, the distribution density can represent distribution every P frequency domain units, i.e., there are P frequency domain units between two frequency domain units for obtaining CSI. For another example, the distribution density can be represented as distribution every Q frequency domain units, Q being an integer greater than or equal to 1, i.e., Q = P + 1. For example, the starting frequency domain unit for obtaining CSI is frequency domain unit 2, and if Q = 2, the other frequency domain units for obtaining CSI are the frequency domain units with indexes of 4 and 6. The above is only an example, and the distribution density can also have other definitions, as long as any technical solution capable of representing the distribution of frequency domain units falls within the scope of the embodiments of the present application.

[0194] It should be noted that the above examples are not limiting to the present application.

[0195] Mode two:

[0196] The first indication information includes: second indication information for indicating a starting frequency domain unit in the frequency domain units for obtaining CSI; and third indication information for indicating the distribution density of the frequency domain unit in the downlink reference signal resource. It can be understood that, unlike mode one, the distribution density in mode two is flexibly configured by indication information. For ease of description, it is assumed that the downlink reference signal resource only occupies Figure 3The identification information (such as identification index) or location information (such as location index) of the 8 frequency domain units is from 0 to 7. For example, the position / identification of the frequency domain unit is its relative position / identification in the downlink reference signal resource, and the indication manner shown in Table 2 is used for illustration. It should be understood that the embodiments of the present application are not limited to the example manner of Table 2. It should be noted that the joint indication manner of the second indication information and the third indication information being the same indication information in Table 2 is used as an example, and the optional second indication information and the third indication information can also be different indication information and are independently indicated.

[0197] Table 2

[0198]

[0199] In the same way as the first aspect, the definition manner of the distribution density can be different. For example, the distribution density can represent distribution per P frequency domain units, or the distribution density can represent distribution per Q frequency domain units, and other definitions are also possible, as long as any technical solution capable of representing the distribution of the frequency domain units falls within the scope of the embodiments of the present application. For example, in Table 2, the distribution density 1 represents distribution per 1 frequency domain unit, that is, there is 1 frequency domain unit for obtaining CSI per 1 frequency domain unit, which can also be interpreted as distribution per 0 frequency domain unit, for example, the frequency domain unit for obtaining CSI starts from the frequency domain unit with index 2, and then the other frequency domain units for obtaining CSI are the frequency domain units with indexes 3, 4, 5, 6, and 7. The distribution density 0.5 represents distribution per 2 frequency domain units, that is, there is 1 frequency domain unit for obtaining CSI per 2 frequency domain units, and the density is 1 / 2 = 0.5, which can also be interpreted as distribution per 1 frequency domain unit, for example, the frequency domain unit for obtaining CSI starts from the frequency domain unit with index 1, and then the other frequency domain units for obtaining CSI are the frequency domain units with indexes 3, 5, and 7. The distribution density 0.25 represents distribution per 4 frequency domain units, that is, there is 1 frequency domain unit for obtaining CSI per 4 frequency domain units, and the density is 1 / 4 = 0.25, which can also be interpreted as distribution per 3 frequency domain units, for example, the frequency domain unit for obtaining CSI starts from the frequency domain unit with index 0, and then the other frequency domain unit for obtaining CSI is the frequency domain unit with index 4.

[0200] The above interpretation of the indication for the starting frequency domain unit can represent an indication of its index, as shown in Table 1. Optionally, it can differ from the interpretation in Table 1, as shown in Table 2. For example, 1 represents the first frequency domain unit in the downlink reference signal resource, which is the frequency domain unit with index 0. This application does not limit the interpretation of the indication. "Reserved" indicates a reserved indication value that can be used for other indications. This is only one example. In the indication, the status value of the corresponding field can be used entirely or partially, reserving some for other indications. All indication methods in this embodiment can consider the "Reserved" case or not.

[0201] Taking Table 2 as an example, if the indication value is 110, then according to the indication, the frequency domain unit used to obtain CSI is determined to be the first frequency domain unit in the downlink reference signal resource, that is, frequency domain unit 0 with index 0, and the distribution density is distributed every 2 frequency domain units, that is, one frequency domain unit is used to obtain CSI for every 2 frequency domain units, or in other words, it is distributed every 1 frequency domain unit. Therefore, all the frequency domain units used for CSI acquisition in the downlink reference signal resource are finally determined to be frequency domain units with indices 0, 2, 4, and 6.

[0202] As can be seen, compared with indication method one, indication method two can also flexibly configure the distribution density of frequency domain units used to obtain CSI.

[0203] Method 3:

[0204] The first indication information includes fourth indication information used to indicate that the frequency domain units used to obtain CSI are divided into a number of frequency domain unit groups; and each of the frequency domain unit groups corresponds to different downlink reference signal ports. It should be understood that in mode three, the frequency domain units used to obtain CSI are grouped, as a possible implementation manner, the frequency domain unit groups correspond to different downlink reference signal ports, so the frequency domain unit groups are equivalent to grouping the downlink reference signal ports. As another possible implementation manner, the frequency domain unit groups correspond to all downlink reference signal ports, i.e., the downlink reference signal ports are not grouped, and the following is an example of 32 ports (32 ports of downlink reference signal port identification is 0-31), through the fourth indication information shown in Table 3, the case of 01, the downlink reference signal resource frequency domain units 0-7 are divided into 4 groups, group 0: [0 4]:, group 1: [1 5], group 2: [2 6], group 3: [3 7], wherein the numbers in the "[]" are the indexes of the frequency domain units. All of the 4 groups of frequency domain units correspond to downlink reference signal ports 0-31. In this way, ports 0-31 measure CSI on the frequency domain units of the 4 frequency domain unit groups, respectively. The characteristic of this scheme is that the terminal device accumulates ports 0-31 on the frequency domain units of group 0 to obtain 32 measurement coefficients, accumulates ports 0-31 on the frequency domain units of group 1 to obtain another 32 measurement coefficients, and respectively obtains 32 measurement coefficients on group 2 and group 3. In this way, 32 ports are used to obtain 128 measurement coefficients. This case is similar to mode one and mode two, and it does not limit to divide the downlink reference signal ports. For mode one and mode two, for example, the frequency domain units used to obtain CSI indicated by the first indication information can be used for all downlink reference signal ports, and the following is an example of 32 ports (32 ports of downlink reference signal port identification is 0-31), assuming that the frequency domain units used to obtain CSI are indexed as 0, 2, 4, and 6 in mode one or mode two, the terminal device can obtain CSI on the frequency domain units indexed as 0, 2, 4, and 6 for the 32 ports of downlink reference signal ports. Of course, in mode one and mode two, the frequency domain units used to obtain CSI can also be divided into frequency domain unit groups corresponding to different downlink reference signal ports. For example, the number of frequency domain unit groups or the number of downlink reference signal port groups can be agreed or signaled, and the association between the frequency domain unit groups and the downlink reference signal port groups can be determined according to the corresponding rules (which can be agreed or signaled). Optionally, mode one / mode two can be combined with mode three / mode four to implement. The following is also assumed that the downlink reference signal resource occupies only the frequency domain Figure 3The identification information (such as an identification index) or the position information (such as a position index) of the 8 frequency domain units is from 0 to 7. Taking the position / identification of the frequency domain unit as an example, which is the relative position / identification of the frequency domain unit in the downlink reference signal resource, the indication mode shown in Table 3 is used for example. Since the grouping of the frequency domain units corresponds to all downlink reference signal ports, which has been described above, the grouping of the frequency domain units corresponding to different downlink reference signal ports is mainly described below, that is, the grouping of the downlink reference signal ports is also performed. It should be understood that the embodiments of the present application are not limited to the example mode of Table 3.

[0205] Table 3

[0206]

[0207] It can be seen that the fourth indication information can determine the number of groups of the frequency domain units in the downlink reference signal resource for the terminal device to obtain the CSI, because the groups of the frequency domain units correspond to different downlink reference signal ports, that is, the number of groups of the downlink reference signal port groups is determined. For example, indication 10 can determine that the 8 frequency domain units with indexes 0-7 are divided into 2 groups, which are used for CSI acquisition of different downlink reference signal ports.

[0208] Optionally, the correspondence between each of the groups of the frequency domain units and different downlink reference signal ports can be indicated by fifth indication information included in the first indication information or pre-configured. It can be understood that the correspondence between each of the groups of the frequency domain units and different downlink reference signal ports can be pre-configured, such as protocol pre-definition, or can be flexibly configured. For example, the protocol stipulates that the downlink reference signal ports are evenly grouped, and the order of the groups of the downlink reference signal ports corresponds to the order of the groups of the frequency domain units (that is, the group number of the downlink reference signal ports from small to large respectively corresponds to the group number of the frequency domain units from small to large). Taking 32 ports as an example, if indication 10 is used, it can be determined that the 8 frequency domain units with indexes 0-7 are divided into 2 groups, and 32 ports are divided into 2 groups. The first 16 ports perform CSI acquisition based on the frequency domain units with indexes 0-3, and the last 16 ports perform CSI acquisition based on the frequency domain units with indexes 4-7. Of course, the protocol can also stipulate that the group number of the downlink reference signal ports from small to large respectively corresponds to the group number of the frequency domain units from large to small. For example, 32 ports are divided into 2 groups, where group number 0 represents the first group, including port numbers 0-15, group number 1 represents the second group, including port numbers 16-31, group number 0 in the group of the frequency domain units represents the first group, including frequency domain units 0-3, and group number 1 represents the second group, including frequency domain units 4-7. It can be determined that ports 0-15 acquire CSI based on frequency domain units 4-7, and ports 16-31 acquire CSI based on frequency domain units 0-3. The above examples of the correspondence do not limit the embodiments of the present application, and the embodiments of the present application can also have other correspondence.

[0209] In combination with the fifth indication information, an example can be illustrated by Table 4. In Table 4, the joint indication manner of the fourth indication information and the fifth indication information as the same indication information is taken as an example, and the optional fourth indication information and the fifth indication information can also be different indication information and are independently indicated respectively.

[0210] Table 4

[0211]

[0212] In Table 4, the corresponding relationship is relationship 1, which indicates that the group numbers of the downlink reference signal ports correspond to the group numbers of the frequency domain units from small to large respectively, and relationship 2 indicates that the group numbers of the downlink reference signal ports correspond to the group numbers of the frequency domain units from large to small respectively. It can be understood that the two kinds of corresponding relationships are only examples, for example, there can also be a corresponding relationship between the parity of the port group number and the parity of the frequency domain unit group number, or a specific indication that the port group number x corresponds to the frequency domain unit group number i, and the like. It can be seen that the fifth indication information can be flexibly configured to correspond to the relationship.

[0213] Mode four:

[0214] The first indication information includes: fourth indication information, used to indicate the number of groups of the frequency domain unit groups for obtaining CSI; and sixth indication information, used to indicate the frequency domain unit starting from the first group in the frequency domain unit group for obtaining CSI; each of the frequency domain unit groups corresponds to a different downlink reference signal port. It can be understood that if the division of the frequency domain unit group for obtaining CSI is not fixed from the first frequency domain unit in all the frequency domain units of the downlink reference signal resource, the frequency domain position of the frequency domain unit group for obtaining CSI can be flexibly configured through the indication of the sixth indication information. The following is illustrated by Table 5. In Table 5, the joint indication manner of the fourth indication information and the sixth indication information as the same indication information is taken as an example, and the optional fourth indication information and the fifth indication information can also be different indication information and are independently indicated respectively.

[0215] Table 5

[0216]

[0217] The above group 0 starting point indicates the frequency domain unit starting from the frequency domain unit group with the group number 0 in the frequency domain unit group (i.e., the first group of frequency domain units), and the indication interpretation thereof can indicate the index indication, such as the indication interpretation in Table 1 or the indication interpretation in Table 2. In Table 5, the same indication interpretation as in Table 2 is taken as an example, for example, 1 indicates the first frequency domain unit in the downlink reference signal resource, which is the frequency domain unit with the index 0. The indication interpretation is not limited in the present application.

[0218] Through the indication information in Table 5, it can be determined that how many groups of frequency domain units in the downlink reference signal resource are used for the terminal device to obtain CSI, and the starting frequency domain unit in the first group of frequency domain units with the group number 0, because the group of frequency domain units corresponds to different downlink reference signal ports, that is, the number of groups of downlink reference signal port grouping is determined. For example, the indication 101 can determine that the 8 frequency domain units with indexes 0-7 are divided into 2 groups, which are respectively used for CSI acquisition of different downlink reference signal ports, and the group of frequency domain units with the group number 0 starts from the second frequency domain unit in the downlink reference signal resource, that is, the group of frequency domain units with the group number 0 includes the frequency domain units with indexes 1, 2, 3, and 4; the group of frequency domain units with the group number 1 includes the frequency domain units with indexes 5, 6, 7, and 0.

[0219] Optionally, the correspondence between each group of frequency domain units and different downlink reference signal ports is indicated by fifth indication information included in the first indication information or is pre-set. For details, reference can be made to the description of the above-mentioned mode three, and here, an example is simply given. For example, still taking 32 ports as an example, the downlink reference signal ports are evenly grouped according to the protocol, and the order of each group corresponds to the order of the group of frequency domain units, so the indication 101 can determine that the group of frequency domain units with the group number 0 includes the frequency domain units with indexes 1, 2, 3, and 4, which are used for CSI acquisition of the downlink reference signal ports with numbers 0-15; the group of frequency domain units with the group number 1 includes the frequency domain units with indexes 5, 6, 7, and 0, which are used for CSI acquisition of the downlink reference signal ports with numbers 16-31.

[0220] In mode four, the first indication information can also include the above-mentioned fifth indication information, which is exemplarily illustrated in Table 6.

[0221] Table 6

[0222]

[0223] The correspondence in Table 6 can be understood by referring to the description of Table 4, and here, no longer be described. It can be seen that the correspondence can be flexibly configured through the fifth indication information. For example, still taking 32 ports as an example, the indication 101 can determine that the group of frequency domain units with the group number 0 includes the frequency domain units with indexes 1, 2, 3, and 4, which are used for CSI acquisition of the downlink reference signal ports with numbers 16-31; the group of frequency domain units with the group number 1 includes the frequency domain units with indexes 5, 6, 7, and 0, which are used for CSI acquisition of the downlink reference signal ports with numbers 0-15.

[0224] Optionally, similar to the first mode, the distribution density of the frequency domain units in each of the groups of frequency domain units in the downlink reference signal resource can be preset by a pre-agreed manner such as an agreement, for example, the distribution density is every P frequency domain units, and P is an integer greater than or equal to 0. It can be understood that if the distribution density is pre-defined, the scenario that the frequency domain units in the downlink reference signal resource can be flexibly grouped is expanded. Taking Table 5 as an example, for example, the agreement stipulates that the distribution density is every 1 frequency domain unit, if 101 is indicated, it can be determined that the 8 frequency domain units with indexes 0-7 are divided into 2 groups, which are respectively used for CSI acquisition of different downlink reference signal ports, and the frequency domain unit group with group number 0 starts from the second frequency domain unit in the downlink reference signal resource, then based on the preset distribution density, it can be determined that the frequency domain unit group with group number 0 includes frequency domain units with indexes 1, 3, 5, and 7; and the frequency domain unit group with group number 1 includes frequency domain units with indexes 2, 4, 6, and 0. For the description of the distribution density, refer to the first mode, which will not be repeated here.

[0225] Optionally, the distribution density can be indicated by the indication information, denoted as the eighth indication information, similar to the third indication information in the second mode, the first indication information can further include the eighth indication information on the basis of the above-mentioned Table 5 or Table 6 example, which is used to indicate the distribution density of the frequency domain units in each of the groups of frequency domain units in the downlink reference signal resource. For reference to the description of the second mode above, which will not be repeated here.

[0226] Optionally, the first indication information further includes the seventh indication information, which is used to indicate the starting frequency domain unit of the remaining groups in the groups of frequency domain units except the first group; through the indication of the seventh indication information, the grouping and division of the frequency domain units in the downlink reference signal resource for obtaining CSI can be non-uniform. For example, it is indicated that the above-mentioned 8 frequency domain units are divided into 2 groups, the starting frequency domain unit of group 0 has an index of 2, and the starting frequency domain unit of group 1 has an index of 5, then it can be determined that group 0 includes frequency domain units with indexes 2, 3, and 4, and group 1 includes frequency domain units with indexes 5, 6, 7, and 0.

[0227] Optionally, the starting frequency domain unit of the remaining groups in the groups of frequency domain units except the first group can also satisfy a predetermined condition by pre-definition of the agreement. The following is an example of the description, for example, the predetermined condition can be:

[0228] (G i +R0)mod M,

[0229] wherein, G i is the group number of the group of frequency domain units, i=0, 1, 2, …, M; R0is the frequency domain unit identifier of the starting frequency domain unit of the first group in the group of frequency domain units; M is the number of groups of the group of frequency domain units. mod represents (Gi +R0) divided by M and taking the remainder.

[0230] For example, the predetermined condition can be:

[0231] (M i +R0-G i )mod M,

[0232] wherein, G i is a group number of the group of frequency domain units, i=0, 1, 2, …, M; R0is a frequency domain unit identifier of a frequency domain unit starting at the first group in the group of frequency domain units; M is a group number of the group of frequency domain units. mod represents (G i +R0) divided by M and taking the remainder. It can be understood that the predetermined condition in the examples of other manners below can also be replaced by this condition, or other conditions, and the present application does not limit the predetermined condition.

[0233] It can be understood that through the above predetermined condition, the frequency domain unit identifier of the frequency domain unit starting at the first group is determined according to the indication information, and the frequency domain unit identifiers of the frequency domain units starting at the remaining groups are determined, thereby determining the frequency domain units starting at the remaining groups. It can be understood that the frequency domain unit identifier here can be position information (such as a position index) or identifier information (such as an identifier index) of the frequency domain unit.

[0234] It should be understood that through the above manners one to four, compared with manner five of directly indicating each frequency domain unit through different values of the corresponding field, the indication overhead can be saved to a certain extent. Manner five is introduced below.

[0235] Manner five:

[0236] The first indication information indicates the frequency domain unit by indicating the identifier or position of the frequency domain unit. It can be understood that if the indication overhead is not considered, the frequency domain unit for the terminal device to obtain the CSI in the downlink reference signal resource can be directly indicated. Still taking the example of the downlink reference signal resource occupying 8 frequency domain units with indexes 0-7, the example is illustrated through Table 7 below.

[0237] Table 7

[0238]

[0239] It can be seen that the fifth mode indicates different frequency domain units in the form of a bitmap. For example, for a frequency domain unit with an index of 1, the first indication information takes a value of 0, which can indicate that the frequency domain unit is not a frequency domain unit for obtaining CSI. For a frequency domain unit with an index of 3, the first indication information takes a value of 1, which can indicate that the frequency domain unit is a frequency domain unit for obtaining CSI. Therefore, according to the indication of Table 7, it can be determined that the indexes of the frequency domain units for obtaining CSI are 0, 2, 3, 5, and 6.

[0240] It can be seen that, although the fifth mode can increase the indication overhead, the indication flexibility is higher.

[0241] The sixth mode is as follows.

[0242] The first indication information can implicitly indicate the frequency domain units for obtaining CSI by indicating a measurement bandwidth. Optionally, the first indication information is configuration information of the measurement bandwidth, or the first indication information indirectly indicates the measurement bandwidth. As an implementation manner, the protocol can agree on a corresponding relationship between the measurement bandwidth and the number of frequency domain unit groups, such as the example relationship shown in Table 8. The protocol can also agree on the specific positions of the frequency domain unit groups and the distribution density of the frequency domain unit groups. For example, the protocol can agree that the starting frequency domain unit of the first frequency domain unit group and the starting frequency domain units of the remaining groups satisfy a predetermined condition. For example, the starting frequency domain unit of the first frequency domain unit group can be the first frequency domain unit (i.e., the frequency domain unit 0 with an index of 0) in the downlink reference signal resource, and the starting frequency domain units of the remaining groups can satisfy a predetermined condition. The predetermined condition can be, for example, (G i +R0)mod M, which is defined in the description of the fourth mode above. The distribution density of the frequency domain unit groups can be similar to the example of the above modes, which can be represented as a distribution of every Q frequency domain units. Optionally, Q=M, which can be denoted as a density equal to 1 / M. It can be understood that at least one of the starting frequency domain unit of the first frequency domain unit group, the starting frequency domain units of the remaining groups, and the distribution density of the frequency domain unit groups can also be indicated by indication information. The relationship between the indication information and the first indication information is not limited in the present application.

[0243] Still taking the example of the downlink reference signal resource occupying 8 frequency domain units with indexes of 0-7, based on the corresponding relationship of Table 8, the network device indicates a measurement bandwidth of 10 MHz by the first indication information, and based on the protocol pre-agreement that the starting position of the first frequency domain unit group is the first frequency domain unit (frequency domain unit 0) in the downlink reference signal resource, the protocol agrees that the starting frequency domain units of the remaining groups satisfy (G iIf the measurement bandwidth is 10MHz, the distribution density of each group of frequency domain units is 1 / 4, and the terminal device can determine that there are four groups of frequency domain units for obtaining the CSI, the first group occupies frequency domain units 0, 4; the second group occupies frequency domain units 1, 5; the third group occupies frequency domain units 2, 6; and the fourth group occupies frequency domain units 3, 7.

[0244] Table 8

[0245] Measurement bandwidth <5 MHz ≥ 5 MHz & < 10 MHz ≥ 10 MHz & < 20 MHz ≥ 20 MHz Number of frequency domain unit groups (M) 1 2 4 8

[0246] As another possible implementation manner, the protocol stipulates the correspondence between the measurement bandwidth and the distribution density P of the frequency domain units for obtaining the CSI (P is described above). For example, the exemplary correspondence is shown in Table 9. The protocol also stipulates the starting frequency domain unit position of the frequency domain units for obtaining the CSI. For example, the network device configures the measurement bandwidth as 10MHz, and the protocol stipulates that the starting frequency domain unit position is the first frequency domain unit (i.e., frequency domain unit 0), and then the frequency domain units for the terminal device to obtain the CSI are 0, 4.

[0247] Table 9

[0248] Measurement bandwidth <5 MHz ≥ 5 MHz & < 10 MHz ≥ 10 MHz & < 20 MHz ≥ 20 MHz Distribution density (P) 0 1 3 7

[0249] As a possible implementation manner, the above measurement bandwidth can be indicated by adding a field or signaling, or can be realized by CSI-FrequencyOccupation configuration in CSI-RS-ResourceMapping of the RRC signaling.

[0250] It should be understood that the correspondence between the measurement bandwidth and the number of groups of frequency domain units or the distribution density in the above table is only a possible implementation manner, and the present application is not limited thereto. In addition, the number of groups of frequency domain units or the distribution density can also be indicated by indication information, and the relationship between the indication information and the first indication information is not limited herein.

[0251] Manner seven:

[0252] The first indication information can implicitly indicate the frequency domain units used for obtaining the CSI by indicating the number of CSI-RS ports. Optionally, the first indication information is configuration information of the CSI-RS ports, or the first indication information indirectly indicates the number of CSI-RS ports. As a possible implementation, the protocol agrees on a correspondence between the number of CSI-RS ports and the number of groups of frequency domain units, as shown in the example relationship in Table 10. The specific positions of each group of frequency domain units and the distribution density of each group of frequency domain units are also agreed, for example, the starting frequency domain unit of the first group of frequency domain units and the starting frequency domain units of the remaining groups satisfy a predetermined condition. For example, the starting frequency domain unit of the first group of frequency domain units is the first frequency domain unit (i.e., frequency domain unit 0 with index 0) in the downlink reference signal resource, and the starting frequency domain units of the remaining groups other than the first group satisfy a predetermined condition, which can be, for example, (G i +R0)mod M, which is defined in the description of the fourth manner above; the distribution density of each group of frequency domain units can be expressed as being distributed every Q frequency domain units, and optionally Q=M, which can be denoted as a density equal to 1 / M. It can be understood that at least one of the starting frequency domain unit of the first group of frequency domain units, the starting frequency domain units of the remaining groups other than the first group, and the distribution density of each group of frequency domain units can also be indicated by indication information, and the relationship between the indication information and the first indication information is not limited by the present application.

[0253] Still taking the example of the downlink reference signal resource occupying 8 frequency domain units with indexes 0-7, based on the correspondence in Table 10, the network device indicates the number of CSI-RS ports as 16 by the first indication information, and based on the agreement that the starting position of the first group of frequency domain units is the first frequency domain unit (frequency domain unit 0), the starting frequency domain units of the remaining groups other than the first group satisfy (G i +R0)mod M, and the distribution density of each group of frequency domain units is 1 / M, the terminal device can determine that there are 4 groups of frequency domain units used for obtaining the CSI, the first group occupies frequency domain units 0, 4; the second group occupies frequency domain units 1, 5; the third group occupies frequency domain units 2, 6; and the fourth group occupies frequency domain units 3, 7.

[0254] Table 10

[0255] Number of CSI-RS ports [1,2,4] [8,12] [16,24] 32 Number of frequency domain unit groups (M) 1 2 4 8

[0256] It can be understood that the correspondence between the number of CSI-RS ports and the number of groups of frequency domain units can be, for example, as shown in Table 10, that the more the number of ports, the more the number of groups of frequency domain units, or as shown in Table 10', that the more the number of ports, the less the number of groups of frequency domain units. Of course, the present application is not limited to these two rules of correspondence, and these are only examples.

[0257] Table 10'

[0258] Number of CSI-RS ports [1,2,4] [8,12] [16,24] 32 Number of frequency domain unit groups (M) 8 4 2 1

[0259] As another possible implementation, the protocol agrees on the correspondence between the number of CSI-RS ports and the distribution density P of the frequency domain units used to obtain the CSI (see the description of P above). An exemplary correspondence can be shown in Table 11 below. The protocol also agrees on the starting position of the frequency domain units used to obtain the CSI. For example, the network device configures the number of CSI-RS ports to be 16 ports, and the protocol agrees that the starting position of the frequency domain units is the first frequency domain unit (i.e., frequency domain unit 0), and then the frequency domain units used by the terminal device to obtain the CSI are 0, 4.

[0260] Table 11

[0261] Number of CSI-RS ports [1,2,4] [8,12] [16,24] 32 Distribution density (P) 0 1 3 7

[0262] It can be understood that the correspondence between the number of CSI-RS ports and the distribution density (P) can be the correspondence shown in Table 11, in which the more the number of ports, the sparser the distribution density (i.e., the larger the number of interval frequency domain units P). It can also be the correspondence shown in Table 11', in which the more the number of ports, the more compact the distribution density (i.e., the smaller the number of interval frequency domain units P). Of course, the present application is not limited to these two rules of correspondence, and these are only examples.

[0263] Table 11'

[0264] Number of CSI-RS ports [1,2,4] [8,12] [16,24] 32 Distribution density (P) 7 3 1 0

[0265] As an implementation, the number of CSI-RS ports described above can be indicated by adding a field or signaling, or can be implemented by configuring nrofPorts in CSI-RS-ResourceMapping of RRC signaling.

[0266] It should be understood that the correspondence between the number of CSI-RS ports and the number of frequency domain unit groups or the distribution density in the above table is only one possible implementation, and the present application is not limited thereto. In addition, the number of frequency domain unit groups or the distribution density can also be indicated by indication information, and the relationship between the indication information and the first indication information is not limited by the present application.

[0267] Mode eight:

[0268] The first indication information can implicitly indicate the frequency domain units used for obtaining the CSI by indicating an angle and time delay reciprocity based CSI acquisition scheme. Optionally, the first indication information is configuration information of a CSI-RS port, or the first indication information indirectly indicates a number of CSI-RS ports. As one possible implementation, the protocol stipulates that when the first indication information indicates that the current CSI acquisition scheme is an angle and time delay reciprocity based CSI acquisition scheme, the frequency domain units are fixedly divided into M groups, and stipulates the specific positions of the frequency domain units in each group and the distribution density of the frequency domain units in each group. For example, it is stipulated that the starting position of the first group of frequency domain units is the first frequency domain unit (i.e., frequency domain unit 0 with an index of 0) in the downlink reference signal resource, and the starting frequency domain units of the remaining groups other than the first group satisfy a predetermined condition. The predetermined condition may, for example, be that (G i +R0)mod M, which is defined with reference to the description in the above-described manner four. The distribution density of the frequency domain units in each group can be expressed as a distribution of every Q frequency domain units, and optionally Q = M, which can be denoted as a density equal to 1 / M.

[0269] Still taking the example in which the downlink reference signal resource occupies 8 frequency domain units with indexes of 0-7, it is assumed that M = 4, and when the network device configures an angle and time delay reciprocity based CSI acquisition scheme, based on the protocol stipulation given in the above example, the terminal device can determine that the starting position of the first group of frequency domain units is the first frequency domain unit (frequency domain unit 0) in the downlink reference signal resource, and the frequency domain units used for obtaining the CSI are 4 groups, the first group occupies frequency domain units 0, 4; the second group occupies frequency domain units 1, 5; the third group occupies frequency domain units 2, 6; and the fourth group occupies frequency domain units 3, 7.

[0270] As another possible implementation, the protocol stipulates that when the first indication information configures the current CSI acquisition scheme as an angle and time delay reciprocity based CSI acquisition scheme, the distribution density of the frequency domain units (assuming it is denoted as P, and the specific meaning is described in the above-described other manners) and the starting frequency domain unit of the frequency domain units used for obtaining the CSI are stipulated. Taking the example in which the protocol stipulates that P = 3, when the network device indicates an angle and time delay reciprocity based CSI acquisition scheme through the first indication information, based on the protocol stipulation that the starting position of the frequency domain units is the first frequency domain unit (frequency domain unit 0) in the downlink reference signal resource, the terminal device determines that the frequency domain units used for obtaining the CSI are 0, 4. It can be understood that the content of the above protocol stipulation can also be indicated by at least one item of indication information, and the relationship between the indication information and the first indication information is not limited by the present application.

[0271] It should be understood that the above-mentioned mode eight can be used in combination with the CSI-RS port and / or the measurement bandwidth. As one implementation manner, when the network device indicates the angle and time delay reciprocity based CSI acquisition scheme, and the measurement bandwidth is greater than, equal to or less than a certain predetermined value, the protocol stipulates that the frequency domain units are fixedly divided into M groups, and the specific position and distribution density of each group of frequency domain units are stipulated, for example, the starting frequency domain unit of the first group of frequency domain units is the first frequency domain unit in the downlink reference signal resource (i.e., the frequency domain unit 0 with the index of 0), and the starting frequency domain units of the remaining groups other than the first group satisfy the predetermined condition, which can be: (G i +R0)mod M; and the distribution density of each group of frequency domain units is 1 / M. Or when the network device indicates the angle and time delay reciprocity based CSI acquisition scheme, and the measurement bandwidth is greater than, equal to or less than a certain predetermined value, the protocol stipulates the distribution density (for example, denoted as P) of the frequency domain units used for acquiring the CSI, and stipulates the starting position of the frequency domain units used for acquiring the CSI.

[0272] As another implementation manner, when the network device indicates the angle and time delay reciprocity based CSI acquisition scheme, and the number of CSI-RS ports is greater than, equal to or less than a certain predetermined value, the protocol stipulates that the frequency domain units are fixedly divided into M groups, and the specific position and distribution density of each group of frequency domain units are stipulated, for example, the starting frequency domain unit of the first group of frequency domain units is the first frequency domain unit in the downlink reference signal resource (i.e., the frequency domain unit 0 with the index of 0), and the starting frequency domain units of the remaining groups other than the first group satisfy the predetermined condition, which can be: (G i +R0)mod M; and the distribution density of each group of frequency domain units is 1 / M. Or when the network device indicates the angle and time delay reciprocity based CSI acquisition scheme, and the number of CSI-RS ports is greater than, equal to or less than a certain predetermined value, the protocol stipulates the distribution density (for example, denoted as P) of the frequency domain units used for acquiring the CSI, and stipulates the starting position of the frequency domain units used for acquiring the CSI.

[0273] As another implementation manner, when the network device indicates the angle and time delay reciprocity based CSI acquisition scheme, and the measurement bandwidth is greater than, equal to or less than a certain predetermined value, and the number of CSI-RS ports is greater than or less than a certain predetermined value, the protocol stipulates that the frequency domain units are fixedly divided into M groups, and the specific position and the distribution density of each group of frequency domain units are stipulated, for example, the starting position of the first group of frequency domain units is the 0th frequency domain unit, and the starting frequency domain units of the remaining groups other than the first group satisfy the following predetermined condition: (G i+R0)mod M; the distribution density of each group of frequency domain units is 1 / M. Or when the network device indicates the CSI acquisition scheme based on angle and time delay reciprocity, and the measurement bandwidth is greater than, equal to or less than a certain predetermined value, and the number of CSI-RS ports is greater than or less than a certain predetermined value, the protocol stipulates that the distribution density of the frequency domain units used to acquire the CSI is P, and stipulates the starting position of the frequency domain units used to acquire the CSI.

[0274] It can be seen that for the above-mentioned modes six to eight, the first indication information includes at least one of the following: indication information for indicating the measurement bandwidth, indication information for indicating the number of CSI-RS ports, and indication information for indicating the CSI acquisition scheme based on angle and time delay reciprocity. These pieces of information can be delivered through one signaling or through multiple signaling; they can be the same indication information or different indication information, that is, the indication of the information to be indicated can be in the form of joint indication or in the form of separate independent indication; these pieces of indication information can be the first indication information or part of the first indication information.

[0275] For the above-mentioned modes six to eight, the CSI-RS is only an example of the downlink reference signal, and the present application is not limited to the CSI-RS, which can be other reference signals in the downlink reference signal.

[0276] For the above-mentioned modes one to five:

[0277] Optionally, the first indication information can be sent through a newly defined field or can be sent by multiplexing an existing field, for example, the first indication information is carried in the sub-band reporting configuration CSI-ReportingBand. It can be understood that the interpretation of different values of the field is redefined, or the first few bits of the existing field are used.

[0278] It should be understood that the above-mentioned first indication information can be delivered through one signaling or through multiple signaling, that is, the second indication information, the third indication information, the fourth indication information, the fifth indication information, the sixth indication information, the seventh indication information, and the eighth indication information included in the first indication information are carried in multiple signaling.

[0279] It should be understood that the above-mentioned first indication information, second indication information, third indication information, fourth indication information, fifth indication information, sixth indication information, seventh indication information, and eighth indication information can be the same indication information or different indication information, that is, the indication of the information to be indicated can be in the form of joint indication or in the form of separate independent indication.

[0280] Through the embodiments of this application, network devices can flexibly configure CSI measurements according to system status (e.g., resource utilization, transmission power, etc.) to control CSI acquisition. This allows terminal devices to acquire CSI more effectively under different circumstances based on instructions.

[0281] It should be understood that in the above embodiments, the terminal device and / or network device may execute some or all of the steps in each embodiment. These steps or operations are merely examples, and other operations or variations thereof may also be performed in the embodiments of this application. Furthermore, the steps may be executed in different orders as presented in the embodiments, and it is not necessary to execute all the operations in the embodiments of this application. Moreover, the sequence number of each step does not imply the order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0282] Figure 4 This is a schematic block diagram of a communication device provided in an embodiment of this application. Figure 4 As shown, the communication device 1000 may include a processing unit 1100 and a transceiver unit 1200.

[0283] In one possible design, the communication device 1000 may correspond to the terminal device in the above method embodiments. For example, it may be a terminal device or a component (such as a chip or chip system) configured in a terminal device.

[0284] It should be understood that the communication device 1000 may correspond to the terminal device in the method 200 according to the embodiments of this application, and the communication device 1000 may include functions for performing... Figure 2 The unit in method 200 of the communication device 1000 executes the method of the terminal device. Furthermore, each unit in the communication device 1000 and the other operations and / or functions described above are respectively for implementing... Figure 2 The corresponding process of method 200 in the middle.

[0285] Wherein, when the communication device 1000 is used to perform Figure 2 When method 200 is executed, processing unit 1100 can be used to execute step 230 in method 200, and transceiver unit 1200 can be used to execute step 220 in method 200. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0286] It should also be understood that when the communication device 1000 is a terminal device, the transceiver unit 1200 in the communication device 1000 can be implemented by a transceiver, for example, it can correspond to Figure 5The transceiver 2020 in the terminal device 2000 shown in the diagram, and the processing unit 1100 in the communication device 1000, can be implemented by at least one processor, for example, corresponding to Figure 5 The processor 2010 in the terminal device 2000 shown in the figure.

[0287] It should also be understood that when the communication device 1000 is a chip configured in a terminal device, the transceiver unit 1200 in the communication device 1000 can be implemented through an input / output interface, and the processing unit 1100 in the communication device 1000 can be implemented through a processor, microprocessor, or integrated circuit integrated on the chip or chip system.

[0288] In another possible design, the communication device 1000 may correspond to the network device in the above method embodiment. For example, it may be a network device or a component (such as a chip or chip system) configured in a network device.

[0289] It should be understood that the communication device 1000 may correspond to the network device in the method 200 according to the embodiments of this application, and the communication device 1000 may include functions for performing... Figure 2 The method 200 in the communication device 1000 is a unit that executes the method. Furthermore, each unit in the communication device 1000 and the other operations and / or functions described above are respectively for implementing... Figure 2 The corresponding process of method 200 in the middle.

[0290] Wherein, when the communication device 1000 is used to perform Figure 2 When method 200 is executed, processing unit 1100 can be used to execute step 210 of method 200, and transceiver unit 1200 can be used to execute step 220 of method 200. It should be understood that the specific process of each unit executing the above-mentioned corresponding steps has been described in detail in the above method embodiments, and will not be repeated here for the sake of brevity.

[0291] It should also be understood that when the communication device 1000 is a network device, the transceiver unit in the communication device 1000 can be implemented by a transceiver, for example, it can correspond to... Figure 6 The transceiver 3100 in the network device 3000 shown in the figure, and the processing unit 1100 in the communication device 1000 can be implemented by at least one processor, for example, corresponding to Figure 6 The processor 3200 in the network device 3000 shown in the figure.

[0292] It should also be understood that when the communication device 1000 is a chip configured in a network device, the transceiver unit 1200 in the communication device 1000 can be implemented through an input / output interface, and the processing unit 1100 in the communication device 1000 can be implemented through a processor, microprocessor, or integrated circuit integrated on the chip or chip system.

[0293] Figure 5 is a structural schematic diagram of a terminal device 2000 provided by an embodiment of the present application. The terminal device 2000 can be applied to a system as shown in Figure 1 , and perform the functions of the terminal device in the above method embodiments. As shown in the figure, the terminal device 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further includes a memory 2030. The processor 2010, the transceiver 2002 and the memory 2030 can communicate with each other through internal connection paths, and transfer control and / or data signals. The memory 2030 is used to store a computer program, and the processor 2010 is used to call and run the computer program from the memory 2030 to control the transceiver 2020 to transceive signals. Optionally, the terminal device 2000 can further include an antenna 2040, which is used to send the uplink data or uplink control signaling output by the transceiver 2020 through wireless signals.

[0294] The above processor 2010 and the memory 2030 can be combined into one processing device, and the processor 2010 is used to execute the program code stored in the memory 2030 to realize the above functions. In specific implementation, the memory 2030 can be integrated in the processor 2010 or independent of the processor 2010. The processor 2010 can correspond to the processing unit 1100 in Figure 4 .

[0295] The above transceiver 2020 can correspond to the transceiving unit 1200 in Figure 4 . The transceiver 2020 can include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). The receiver is used to receive signals, and the transmitter is used to transmit signals.

[0296] It should be understood that the terminal device 2000 as shown in Figure 5 can realize each process of the terminal device in the method embodiment as shown in Figure 2 . The operation and / or function of each module in the terminal device 2000 is respectively used to realize the corresponding flow in the above method embodiments. For details, please refer to the description in the above method embodiments, and the detailed description is appropriately omitted here.

[0297] The above processor 2010 can be used to execute the actions implemented internally by the terminal device described in the above method embodiments, such as the control of the terminal device to other components (for example, the control of the transceiver 2020); and the transceiver 2020 can be used to execute the actions of the terminal device receiving or sending to the network device described in the above method embodiments. For details, please refer to the description in the above method embodiments, and the description is not repeated here.

[0298] Optionally, the terminal device 2000 may also include a power supply 2050 for providing power to various devices or circuits in the terminal device.

[0299] In addition, to make the terminal device more functional, the terminal device 2000 may also include one or more of the following: an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, and a sensor 2100. The audio circuit may also include a speaker 2082, a microphone 2084, etc.

[0300] Figure 6 This is a schematic diagram of the network device provided in the embodiments of this application, for example, a schematic diagram of a base station. This base station 3000 can be applied to, for example... Figure 1 In the system shown, the functions of the network device in the above method embodiment are executed. As shown in the figure, the base station 3000 may include one or more radio frequency units, such as a remote radio unit (RRU) 3100 and one or more baseband units (BBU) (also referred to as distributed units (DU)) 3200. The RRU 3100 may be referred to as a transceiver unit, and... Figure 4 The transceiver unit 3100 corresponds to the transceiver unit 1200 in the diagram. Optionally, the transceiver unit 3100 can also be called a transceiver, transceiver circuit, or transceiver, etc., and it may include at least one antenna 3101 and a radio frequency unit 3102. Optionally, the transceiver unit 3100 may include a receiving unit and a transmitting unit, where the receiving unit may correspond to a receiver (or receiver circuit) and the transmitting unit may correspond to a transmitter (or transmitter circuit). The RRU 3100 is mainly used for transmitting and receiving radio frequency signals and converting radio frequency signals to baseband signals, such as for sending indication information to terminal equipment. The BBU 3200 is mainly used for baseband processing and controlling the base station. The RRU 3100 and BBU 3200 can be physically set together or physically separated, i.e., a distributed base station.

[0301] The BBU 3200 is the control center of the base station, also known as the processing unit, and can communicate with... Figure 4 The processing unit 1100 in the above-mentioned method is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spreading, etc. For example, the BBU (processing unit) can be used to control the base station to execute the operation process of the network device in the above-mentioned method embodiment, such as generating the above-mentioned indication information.

[0302] In an example, the BBU 3200 can be composed of one or more boards, and the boards can collectively support a wireless access network of a single access technology (e.g., an LTE network), or can separately support wireless access networks of different access technologies (e.g., an LTE network, a 5G network, or other networks). The BBU 3200 further includes a memory 3201 and a processor 3202. The memory 3201 is configured to store necessary instructions and data. The processor 3202 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operations of the network device in the above method embodiments. The memory 3201 and the processor 3202 can serve one or more boards. That is, the memory and the processor can be separately arranged on each board. Alternatively, the memory and the processor can be shared by multiple boards. In addition, necessary circuits can also be arranged on each board.

[0303] It should be understood that, Figure 6 The base station 3000 shown can implement Figure 2 The processes of the network device in the method embodiments described above. The operations and / or functions of the various modules in the base station 3000 are respectively configured to implement the corresponding processes in the above method embodiments. For details, refer to the descriptions in the above method embodiments, and the detailed descriptions are appropriately omitted here.

[0304] The BBU 3200 described above can be configured to perform the actions implemented internally by the network device described in the above method embodiments, and the RRU 3100 can be configured to perform the actions of sending or receiving by the network device to or from the terminal device described in the above method embodiments. For details, refer to the descriptions in the above method embodiments, and the detailed descriptions are appropriately omitted here.

[0305] It should be understood that, Figure 6 The base station 3000 shown is only one possible form of the network device, and should not constitute any limitation on the present application. The methods provided by the present application can be applied to other forms of network devices. For example, the network device can include an AAU, and can further include a CU and / or a DU, or can include a BBU and an adaptive radio unit (ARU), or a BBU; the network device can also be a customer premises equipment (CPE), and can also be in other forms, and the present application does not limit the specific form of the network device.

[0306] The CU and / or the DU can be configured to perform the actions implemented internally by the network device described in the above method embodiments, and the AAU can be configured to perform the actions of sending or receiving by the network device to or from the terminal device described in the above method embodiments. For details, refer to the descriptions in the above method embodiments, and the detailed descriptions are appropriately omitted here.

[0307] The embodiment of the present application further provides a processing device, comprising a processor and an interface; the processor is used for executing the method in any of the method embodiments.

[0308] It should be understood that the processing device described above can be one or more chips. For example, the processing device can be a field programmable gate array (FPGA), can be an application specific integrated circuit (ASIC), can also be a system on chip (SoC), can also be a central processor unit (CPU), can also be a network processor (NP), can also be a digital signal processor (DSP), can also be a micro controller unit (MCU), can also be a programmable logic device (PLD) or other integrated chip.

[0309] In the implementation process, each step of the above method can be completed by the integrated logic circuit of the hardware in the processor or the instructions in the software form. The steps of the method disclosed in the embodiment of the present application can be directly embodied as the execution completed by the hardware processor, or executed by the combination of the hardware and the software module in the processor. The software module can be located in the mature storage medium in the field, such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable memory, register and the like. The storage medium is located in the memory, and the processor reads the information in the memory, and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0310] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with a signal processing capability. In the implementation process, the steps of the above method embodiments can be completed by an integrated logic circuit or an instruction in the form of software in the processor. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as a hardware code processor for execution, or a combination of hardware and software modules in the code processor for execution. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the storage, and the processor reads the information in the storage, and combines the hardware to complete the steps of the above method.

[0311] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example but not limitation, many forms of RAM are available, 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 SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct memory bus random access memory (DRAM). It should be noted that the memory of the system and method described herein is intended to include but not limited to these and any other suitable types of memory.

[0312] According to the method provided by the embodiment of the application, the application further provides a computer program product, which comprises computer program codes, and when the computer program codes run on a computer, the computer is caused to execute the method. Figure 2 The method executed by the terminal device and the network device in the embodiment shown.

[0313] According to the method provided by the embodiment of the application, the application further provides a computer readable medium, which stores program codes, and when the program codes run on a computer, the computer is caused to execute the method. Figure 2 The method executed by the terminal device and the network device in the embodiment shown.

[0314] According to the method provided by the embodiment of the application, the application further provides a system, which comprises one or more terminal devices and one or more network devices.

[0315] The network device in each of the apparatus embodiments above and the network device or the terminal device in the method embodiments correspond completely, and the corresponding steps are executed by the corresponding modules or units, for example, the communication unit (transceiver) executes the steps of receiving or sending in the method embodiments, and the steps other than sending and receiving can be executed by the processing unit (processor). The functions of the specific units can refer to the corresponding method embodiments. The processor can be one or more.

[0316] In this specification, the terms "component", "module", "system" and the like are used to represent computer-related entities, hardware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and / or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and / or thread of execution, and a component can be localized on one computer and / or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components can communicate by way of local and / or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and / or across a network such as the Internet with other systems via the signal), by way of the data packets, and / or other means in accordance with a signal.

[0317] Those of skill in the art would understand that the various illustrative logical blocks and steps described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or combinations of both. The disclosure is not limited to implementations set forth herein for the sake of providing an overall understanding of architectures, suitability, and alternatives thereof. Those of skill would further understand that the functionality of various illustrative logical blocks and steps can be carried out by one or more electrical circuits, microprocessors, or gate arrays designed with source or object code, by a programmed computer, or by a combination thereof. Such functionality can be carried out in various ways, depending inter alia on the particular application for which the disclosure is employed, the design choices, and available technology. Skilled artisans can employ a variety of different approaches to implement the described functionality, and all combinations of these approaches are contemplated.

[0318] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the system, device and unit described above can refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0319] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0320] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0321] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit.

[0322] In the above embodiments, the functions of the various functional units can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, the software can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are wholly or partially generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. 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 includes one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, high-density digital video disc (digital video disc, DVD)), or semiconductor media (for example, solid state disk (solid state disk, SSD)) and the like.

[0323] The functions, if implemented in the form of software functional units and sold or used as independent products, can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (read-only memory, ROM), a random access memory (random access memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0324] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for indicating Channel State Information (CSI) measurements, characterized in that, The method includes: Receive first indication information from network device, the first indication information being used to indicate a frequency domain unit in downlink reference signal resources for the terminal device to obtain the CSI; Based on the first indication information, the CSI is measured on the frequency domain unit; The first indication information includes: The second indication information and the third indication information, wherein the second indication information is used to indicate the starting frequency domain unit in the frequency domain unit, and the third indication information is used to indicate the distribution density of the frequency domain unit in the downlink reference signal resource; The second and third indications are jointly indicated by the same indication.

2. The method according to claim 1, characterized in that, The first indication information includes: The fourth indication information is used to indicate the number of groups into which the frequency domain unit is divided.

3. The method according to claim 2, characterized in that, Each frequency domain unit group corresponds to a different downlink reference signal port. The correspondence between each frequency domain unit group and the different downlink reference signal ports is indicated by the fifth indication information included in the first indication information, or is preset.

4. The method according to claim 2, characterized in that, The first indication information also includes: The sixth indication information is used to indicate the first frequency domain unit in the first group of the frequency domain unit group.

5. The method according to claim 3, characterized in that, The distribution density of the frequency domain units in each of the frequency domain unit groups in the downlink reference signal resource is preset to be distributed at intervals of P frequency domain units, where P is an integer greater than or equal to 0.

6. The method according to claim 4, characterized in that, The first indication information further includes a seventh indication information, used to indicate the starting frequency domain units of the remaining groups in the frequency domain unit group other than the first group; or The frequency domain units of the remaining groups in the frequency domain unit group, excluding the first group, are preset to meet predetermined conditions.

7. The method according to claim 6, characterized in that, The predetermined conditions are: (G i +R0)mod M, Among them, G i R0 is the group number of the frequency domain unit group, i = 0, 1, 2, ..., M; M is the frequency domain unit identifier of the first frequency domain unit in the frequency domain unit group; M is the group number of the frequency domain unit group; mod represents (G i +R0) divided by M and the remainder is taken.

8. The method according to claim 1, characterized in that, The first indication information indicates the frequency domain unit by indicating the identifier or location of the frequency domain unit.

9. The method according to claim 1, characterized in that, The first indication information includes at least one of the following: Indication information used to indicate the measurement bandwidth, indication information used to indicate the number of downlink reference signal ports, and indication information used to indicate the CSI acquisition scheme based on angle and time delay reciprocity.

10. The method according to claim 9, characterized in that, At least one of the following is preset or indicated via the ninth instruction information: The correspondence between the measured bandwidth and the number of frequency domain unit groups into which the frequency domain unit is divided; The correspondence between the measurement bandwidth and the distribution density of the frequency domain units; The correspondence between the number of downlink reference signal ports and the number of frequency domain unit groups; The correspondence between the number of downlink reference signal ports and the distribution density of the frequency domain units; The first group of initial frequency domain units; Frequency domain units starting from the groups other than the first group; Distribution density of each group of frequency domain units; The distribution density of the frequency domain units; The starting frequency domain unit in the frequency domain unit.

11. The method according to any one of claims 1-10, characterized in that, The first indication information is carried in the subband reporting configuration CSI-ReportingBand.

12. The method according to any one of claims 1-10, characterized in that, The frequency domain unit is a resource block (RB), a subband, a subcarrier, or a bandwidth portion (BWP).

13. A method for indicating Channel State Information (CSI) measurements, characterized in that, The method includes: Generate first indication information, which is used to indicate the frequency domain unit in the downlink reference signal resource used by the terminal device to obtain the CSI; Send the first instruction information; The first indication information includes: The second indication information and the third indication information, wherein the second indication information is used to indicate the starting frequency domain unit in the frequency domain unit, and the third indication information is used to indicate the distribution density of the frequency domain unit in the downlink reference signal resource; The second and third indications are jointly indicated by the same indication.

14. The method according to claim 13, characterized in that, The first indication information includes: The fourth indication information is used to indicate the number of groups into which the frequency domain unit is divided.

15. The method according to claim 14, characterized in that, Each frequency domain unit group corresponds to a different downlink reference signal port. The correspondence between each frequency domain unit group and the different downlink reference signal ports is indicated by the fifth indication information included in the first indication information, or is preset.

16. The method according to claim 14, characterized in that, The first indication information also includes: The sixth indication information is used to indicate the first frequency domain unit in the first group of the frequency domain unit group.

17. The method according to claim 15, characterized in that, The distribution density of the frequency domain units in each of the frequency domain unit groups in the downlink reference signal resource is preset to be distributed at intervals of P frequency domain units, where P is an integer greater than or equal to 0.

18. The method according to claim 16, characterized in that, The first indication information further includes a seventh indication information, used to indicate the starting frequency domain units of the remaining groups in the frequency domain unit group other than the first group; or The frequency domain units of the remaining groups in the frequency domain unit group, excluding the first group, are preset to meet predetermined conditions.

19. The method according to claim 18, characterized in that, The predetermined conditions are: (G i +R0)mod M, Among them, G i R0 is the group number of the frequency domain unit group, i = 0, 1, 2, ..., M; M is the frequency domain unit identifier of the first frequency domain unit in the frequency domain unit group; M is the group number of the frequency domain unit group; mod represents (G i +R0) divided by M and the remainder is taken.

20. The method according to claim 13, characterized in that, The first indication information indicates the frequency domain unit by indicating the identifier or location of the frequency domain unit.

21. The method according to claim 13, characterized in that, The first indication information includes at least one of the following: Indication information used to indicate the measurement bandwidth, indication information used to indicate the number of downlink reference signal ports, and indication information used to indicate the CSI acquisition scheme based on angle and time delay reciprocity.

22. The method according to claim 21, characterized in that, At least one of the following is preset or indicated via the ninth instruction information: The correspondence between the measured bandwidth and the number of frequency domain unit groups into which the frequency domain unit is divided; The correspondence between the measurement bandwidth and the distribution density of the frequency domain units; The correspondence between the number of downlink reference signal ports and the number of frequency domain unit groups; The correspondence between the number of downlink reference signal ports and the distribution density of the frequency domain units; The first group of initial frequency domain units; Frequency domain units starting from the groups other than the first group; Distribution density of each group of frequency domain units; The distribution density of the frequency domain units; The starting frequency domain unit in the frequency domain unit.

23. The method according to any one of claims 13-22, characterized in that, The first indication information is carried in the subband reporting configuration CSI-ReportingBand.

24. The method according to any one of claims 13-22, characterized in that, The frequency domain unit is a resource block (RB), a subband, a subcarrier, or a bandwidth portion (BWP).

25. An indication device for measuring Channel State Information (CSI), characterized in that, The device includes: The transceiver unit is configured to receive first indication information from a network device, wherein the first indication information is configured to indicate a frequency domain unit in the downlink reference signal resource used by the terminal device to obtain the CSI; A processing unit is configured to measure the CSI in the frequency domain unit based on the first indication information; The first indication information includes: The second indication information and the third indication information, wherein the second indication information is used to indicate the starting frequency domain unit in the frequency domain unit, and the third indication information is used to indicate the distribution density of the frequency domain unit in the downlink reference signal resource; The second and third indications are jointly indicated by the same indication.

26. The apparatus according to claim 25, characterized in that, The first indication information includes: The fourth indication information is used to indicate the number of groups into which the frequency domain unit is divided.

27. The apparatus according to claim 26, characterized in that, Each frequency domain unit group corresponds to a different downlink reference signal port. The correspondence between each frequency domain unit group and the different downlink reference signal ports is indicated by the fifth indication information included in the first indication information, or is preset.

28. The apparatus according to claim 26, characterized in that, The first indication information also includes: The sixth indication information is used to indicate the first frequency domain unit in the first group of the frequency domain unit group.

29. The apparatus according to claim 27, characterized in that, The distribution density of the frequency domain units in each of the frequency domain unit groups in the downlink reference signal resource is preset to be distributed at intervals of P frequency domain units, where P is an integer greater than or equal to 0.

30. The apparatus according to claim 28, characterized in that, The first indication information further includes a seventh indication information, used to indicate the starting frequency domain units of the remaining groups in the frequency domain unit group other than the first group; or The frequency domain units of the remaining groups in the frequency domain unit group, excluding the first group, are preset to meet predetermined conditions.

31. The apparatus according to claim 30, characterized in that, The predetermined conditions are: (G i +R0)mod M, Among them, G i R0 is the group number of the frequency domain unit group, i = 0, 1, 2, ..., M; M is the frequency domain unit identifier of the first frequency domain unit in the frequency domain unit group; M is the group number of the frequency domain unit group; mod represents (G i +R0) divided by M and the remainder is taken.

32. The apparatus according to claim 25, characterized in that, The first indication information indicates the frequency domain unit by indicating the identifier or location of the frequency domain unit.

33. The apparatus according to claim 25, characterized in that, The first indication information includes at least one of the following: Indication information used to indicate the measurement bandwidth, indication information used to indicate the number of downlink reference signal ports, and indication information used to indicate the CSI acquisition scheme based on angle and time delay reciprocity.

34. The apparatus according to claim 33, characterized in that, At least one of the following is preset or indicated via the ninth instruction information: The correspondence between the measured bandwidth and the number of frequency domain unit groups into which the frequency domain unit is divided; The correspondence between the measurement bandwidth and the distribution density of the frequency domain units; The correspondence between the number of downlink reference signal ports and the number of frequency domain unit groups; The correspondence between the number of downlink reference signal ports and the distribution density of the frequency domain units; The first group of initial frequency domain units; Frequency domain units starting from the groups other than the first group; Distribution density of each group of frequency domain units; The distribution density of the frequency domain units; The starting frequency domain unit in the frequency domain unit.

35. The apparatus according to any one of claims 25-34, characterized in that, The first indication information is carried in the subband reporting configuration CSI-ReportingBand.

36. The apparatus according to any one of claims 25-34, characterized in that, The frequency domain unit is a resource block (RB), a subband, a subcarrier, or a bandwidth portion (BWP).

37. An indication device for Channel State Information (CSI) measurement, characterized in that, The device includes: A processing unit is configured to generate first indication information, wherein the first indication information is configured to indicate a frequency domain unit in the downlink reference signal resource used by the terminal device to obtain the CSI; Transceiver unit, used to send the first indication information; The first indication information includes: The second indication information and the third indication information, wherein the second indication information is used to indicate the starting frequency domain unit in the frequency domain unit, and the third indication information is used to indicate the distribution density of the frequency domain unit in the downlink reference signal resource; The second and third indications are jointly indicated by the same indication.

38. The apparatus according to claim 37, characterized in that, The first indication information includes: The fourth indication information is used to indicate the number of groups into which the frequency domain unit is divided.

39. The apparatus according to claim 38, characterized in that, Each frequency domain unit group corresponds to a different downlink reference signal port. The correspondence between each frequency domain unit group and the different downlink reference signal ports is indicated by the fifth indication information included in the first indication information, or is preset.

40. The apparatus according to claim 38, characterized in that, The first indication information also includes: The sixth indication information is used to indicate the first frequency domain unit in the first group of the frequency domain unit group.

41. The apparatus according to claim 39, characterized in that, The distribution density of the frequency domain units in each of the frequency domain unit groups in the downlink reference signal resource is preset to be distributed at intervals of P frequency domain units, where P is an integer greater than or equal to 0.

42. The apparatus according to claim 40, characterized in that, The first indication information further includes a seventh indication information, used to indicate the starting frequency domain units of the remaining groups in the frequency domain unit group other than the first group; or The frequency domain units of the remaining groups in the frequency domain unit group, excluding the first group, are preset to meet predetermined conditions.

43. The apparatus according to claim 42, characterized in that, The predetermined conditions are: (G i +R0)mod M, Among them, G i R0 is the group number of the frequency domain unit group, i = 0, 1, 2, ..., M; M is the frequency domain unit identifier of the first frequency domain unit in the frequency domain unit group; M is the group number of the frequency domain unit group; mod represents (G i +R0) divided by M and the remainder is taken.

44. The apparatus according to claim 37, characterized in that, The first indication information indicates the frequency domain unit by indicating the identifier or location of the frequency domain unit.

45. The apparatus according to claim 37, characterized in that, The first indication information includes at least one of the following: Indication information used to indicate the measurement bandwidth, indication information used to indicate the number of downlink reference signal ports, and indication information used to indicate the CSI acquisition scheme based on angle and time delay reciprocity.

46. ​​The apparatus according to claim 45, characterized in that, At least one of the following is preset or indicated via the ninth instruction information: The correspondence between the measured bandwidth and the number of frequency domain unit groups into which the frequency domain unit is divided; The correspondence between the measurement bandwidth and the distribution density of the frequency domain units; The correspondence between the number of downlink reference signal ports and the number of frequency domain unit groups; The correspondence between the number of downlink reference signal ports and the distribution density of the frequency domain units; The first group of initial frequency domain units; Frequency domain units starting from the groups other than the first group; Distribution density of each group of frequency domain units; The distribution density of the frequency domain units; The starting frequency domain unit in the frequency domain unit.

47. The apparatus according to any one of claims 37-46, characterized in that, The first indication information is carried in the subband reporting configuration CSI-ReportingBand.

48. The apparatus according to any one of claims 37-46, characterized in that, The frequency domain unit is a resource block (RB), a subband, a subcarrier, or a bandwidth portion (BWP).

49. The apparatus according to any one of claims 25-34 and 37-46, characterized in that, The processing unit is a processor, and the transceiver unit is a transceiver.

50. A processing apparatus, characterized in that, The device includes at least one processor and a communication interface for inputting and / or outputting signals, wherein the at least one processor is configured to execute a computer program stored in a memory to enable the device to perform the method as described in any one of claims 1 to 24.

51. A processing apparatus, characterized in that, The device includes a processor for executing a computer program stored in a memory to cause the device to perform the method as described in any one of claims 1 to 24.

52. A processing apparatus, characterized in that, include: Memory, used to store computer programs; A processor for calling and running the computer program from the memory, such that the apparatus implements the method as described in any one of claims 1 to 24.

53. A computer-readable medium, characterized in that, Includes a computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 24.

54. A computer program product, characterized in that, The computer program product includes a computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 24.

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