CN111510189B

CN111510189B - Information feedback method and device

Info

Publication number: CN111510189B
Application number: CN201910094033.XA
Authority: CN
Inventors: 金黄平; 任翔; 王潇涵; 韩玮; 吴晔; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-01-30
Filing date: 2019-01-30
Publication date: 2021-09-14
Anticipated expiration: 2039-01-30
Also published as: WO2020156103A1; CN113965232A; CN113965232B; CN111510189A

Abstract

The application provides an information feedback method and device, relates to the technical field of communication, and is used for solving the problem that channel state information fed back by a current terminal is not suitable for the terminal in a mobile state. The method comprises the following steps: the terminal generates first indication information, wherein the first indication information is used for indicating M time-frequency null units and weighting coefficients of the M time-frequency null units; wherein, a time-frequency space unit is determined according to a time-domain base vector, a frequency-domain base vector and a space-domain base vector. And then, the terminal sends the first indication information to the network equipment. The method and the device are suitable for the channel detection process.

Description

Information feedback method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to an information feedback method and apparatus.

Background

Massive multiple input multiple output (Massive MIMO) technology is one of the key technologies of the fifth generation (5th generation, 5G) communication system. Massive MIMO achieves significant improvements in spectral efficiency through the use of large-scale antennas. The accuracy of Channel State Information (CSI) acquired by the network device determines the performance of Massive MIMO to a great extent. In a Frequency Division Duplex (FDD) system or a Time Division Duplex (TDD) system in which channel reciprocity is not well satisfied, a codebook is generally used to quantize CSI. Therefore, codebook design is a key issue for Massive MIMO.

In the third generation partnership project (3 GPP) R15 protocol, codebooks are divided into Type I codebooks and Type II codebooks. The idea of the Type I codebook is beam selection, and the Type I codebook has a low overhead but a low approximation precision. The idea of the Type II codebook is that the beams are linearly combined, the approximation precision of the Type II codebook is high, but the feedback overhead is large. The codebook of the dominant opinion in the R16 protocol is the frequency domain compressed codebook. The frequency domain compression codebook compresses the codebook by using the continuity of the frequency domain, thereby reducing the feedback overhead and improving the performance of the codebook.

Currently, the channel state information can only characterize the channel state of the terminal at one time node based on the codebook defined by the R15 protocol or the R16 protocol. If the terminal is in a mobile state, the channel of the terminal may change over time. In this way, the precoding vector (or matrix) determined by the network device according to the previous channel state information does not match the current channel state of the terminal, so that the communication between the network device and the terminal is greatly interfered.

Disclosure of Invention

The application provides an information feedback method and device, which are used for solving the problem that the channel state information fed back by the current terminal is not suitable for the terminal in a moving state.

In order to achieve the purpose, the technical scheme is as follows:

in a first aspect, an information feedback method is provided, including: the terminal generates first indication information, wherein the first indication information is used for indicating M time-frequency space units and weighting coefficients of the M time-frequency space units; a time-frequency space unit is determined according to a time-domain basis vector, a frequency-domain basis vector and a space-domain basis vector, wherein M is a positive integer. And then, the terminal sends the first indication information to the network equipment. Based on the technical scheme, each time-frequency space unit in the M time-frequency space units indicated by the first indication information is determined according to a frequency domain basis vector, a time domain basis vector and a space domain basis vector, and the time domain basis vector can represent the change rule of the channel in the time domain, so that the time-frequency space units can also represent the change rule of the channel in the time domain. Therefore, the precoding matrix (or precoding vector) determined by the M time-frequency space units and the M weighting coefficients indicated by the first indication information can be matched with a channel changed by the terminal along with time change, and normal communication between the network equipment and the terminal is ensured.

In one possible design, the first indication information is used to indicate indexes of M time-frequency space-time units in the time-frequency space-time unit set; or, the first indication information is used to indicate indexes of the M time-frequency null units in the time-frequency null unit subset.

In one possible design, the first indication information is used to indicate L space-domain basis vectors, K time-domain basis vectors, and N frequency-domain basis vectors; alternatively, the first indication information indicates the L space base vectors and X₁A time-frequency unit; alternatively, the first indication information indicates K time-domain basis vectors and X₂A plurality of space-frequency units; alternatively, the first indication information indicates the N frequency-domain basis vectors and X₃And a space-time unit. Wherein, a time-frequency unit is determined by a time-domain basis vector and a frequency-domain basis vector; a space-frequency unit is determined by a space-domain basis vector and a frequency-domain basis vector; a space-time unit is defined by a time-domain basis vector and a space-domain basis vector. L, K, N, X₁、X₂And X₃Are all positive integers.

In one possible design, before the terminal generates the indication information, the method further includes: the terminal receives second indication information, wherein the second indication information is used for configuring a preset channel state information feedback mode; if the terminal adopts a preset channel state information feedback mode, the terminal detects reference signals of n time units and determines channel state information, wherein the channel state information comprises first indication information, and n is an integer greater than 1. Therefore, the terminal can feed back the channel state information based on n time units, and the precoding matrix (or precoding vector) adopted by the network equipment can be matched with the channel changed by the terminal along with the time, so that the normal communication between the network equipment and the terminal is ensured.

In one possible design, the second indication information is carried in codebook indication information, and the codebook indication information is used to indicate a type of a codebook used by the terminal. The codebook type comprises a type I codebook, a type II codebook and a time-frequency space codebook. It can be understood that, when the codebook indication information indicates that the codebook used by the terminal is a time-frequency space codebook, the codebook indication information carries the second indication information. In other words, the codebook indication information indirectly indicates that the terminal uses a preset channel state information feedback mode.

In a possible design, the second indication information is further used to indicate a value of n, so that the terminal can determine the value of n, that is, the terminal can determine the number of time units that need to perform reference signal measurement.

In one possible design, the method further includes: the terminal receives reference signal resource configuration information, wherein the reference signal resource configuration information is used for configuring a reference signal resource set, the reference signal resource set comprises a plurality of reference signal resources, and the plurality of reference signal resources correspond to different time units.

In one possible design, the method further includes: the terminal receives reference signal resource configuration information, wherein the reference signal resource configuration information is used for configuring a plurality of reference signal resource sets, and the plurality of reference signal resource sets correspond to different time units.

In a second aspect, an information feedback method is provided, including: the network equipment receives first indication information, wherein the first indication information is used for indicating M time-frequency space units and weighting coefficients of the M time-frequency space units; a time-frequency space unit is determined according to a time-domain basis vector, a frequency-domain basis vector and a space-domain basis vector, wherein M is a positive integer. And then, the network equipment determines the M time-frequency space units and the weighting coefficients of the M time-frequency space units according to the first indication information. Based on the technical scheme, each time-frequency space unit in the M time-frequency space units indicated by the first indication information is determined according to a frequency domain basis vector, a time domain basis vector and a space domain basis vector, and the time domain basis vector can represent the change rule of the channel in the time domain, so that the time-frequency space units can also represent the change rule of the channel in the time domain. Therefore, the precoding matrix (or precoding vector) determined by the M time-frequency space units and the M weighting coefficients indicated by the first indication information can be matched with a channel changed by the terminal along with time change, and normal communication between the network equipment and the terminal is ensured.

In one possible design, the first indication information is used to indicate indexes of M time-frequency space-time units in the time-frequency space-time unit set; or, the first indication information is used to indicate indexes of the M time-frequency null units in the subset of the time-frequency null unit set.

In one possible design, the method further includes: sending second indication information, wherein the second indication information is used for configuring a preset channel state information feedback mode; the preset channel state information feedback mode is used for indicating the terminal to detect reference signals of n time units and determining channel state information; the channel state information includes first indication information, and n is an integer greater than 1.

In one possible design, the second indication information is carried in codebook indication information, and the codebook indication information is used to indicate a type of a codebook used by the terminal.

In one possible design, the second indication information is further used to indicate a value of n.

In one possible design, the method further includes: the network device sends reference signal resource configuration information, wherein the reference signal resource configuration information is used for configuring a reference signal resource set, the reference signal resource set comprises a plurality of reference signal resources, and the plurality of reference signal resources correspond to different time units.

In one possible design, the method further includes: the network device sends reference signal resource configuration information, wherein the reference signal resource configuration information is used for configuring a plurality of reference signal resource sets, and the plurality of reference signal resource sets correspond to different time units.

In a third aspect, a terminal is provided, including: a processing module and a communication module. The processing module is used for generating first indication information, and the first indication information is used for indicating the M time-frequency null units and weighting coefficients of the M time-frequency null units; a time-frequency space unit is determined according to a time-domain basis vector, a frequency-domain basis vector and a space-domain basis vector, wherein M is a positive integer. And the communication module is used for sending the first indication information.

In one possible design, the communication module is further configured to receive second indication information, where the second indication information is used to configure a preset channel state information feedback mode. The processing module is further configured to detect reference signals of n time units and determine channel state information if a preset channel state information feedback mode is adopted, where the channel state information includes first indication information, and n is an integer greater than 1.

In one possible design, the communication module is further configured to receive reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, and the reference signal resource set includes a plurality of reference signal resources, and the plurality of reference signal resources correspond to different time units.

In one possible design, the communication module is further configured to receive reference signal resource configuration information, where the reference signal resource configuration information is used to configure a plurality of reference signal resource sets, and the plurality of reference signal resource sets correspond to different time units.

In a fourth aspect, a communication apparatus is provided, including: a processor and a memory, wherein the processor is configured to read an instruction in the memory and implement the information feedback method according to the instruction.

In a fifth aspect, a computer-readable storage medium is provided, which stores instructions that, when executed on a communication apparatus, enable the communication apparatus to perform the information feedback method of the first aspect.

A sixth aspect provides a computer program product containing instructions which, when run on a communication apparatus, enables the communication apparatus to perform the information feedback method of the first aspect.

In a seventh aspect, a chip is provided, where the chip includes a processing module and a communication interface, the communication interface is configured to receive an input signal and provide the input signal to the processing module, and/or is configured to output a signal generated by the processing module, and the processing module is configured to perform the information feedback method according to the first aspect. In an embodiment, the processing module may execute the code instructions to perform the information feedback method according to the first aspect. The code instructions may come from memory internal to the chip or from memory external to the chip. Alternatively, the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiver pin on a chip.

The technical effects brought by any one of the design manners in the third aspect to the seventh aspect may refer to the beneficial effects in the corresponding methods provided above and the technical effects brought by the design manners, and are not described herein again.

In an eighth aspect, a network device is provided, comprising: the device comprises a communication module and a processing module. The communication module is used for receiving first indication information, wherein the first indication information is used for indicating the M time-frequency null units and the weighting coefficients of the M time-frequency null units; a time-frequency space unit is determined according to a time-domain basis vector, a frequency-domain basis vector and a space-domain basis vector, wherein M is a positive integer. And the processing module is used for determining the M time-frequency space units and the weighting coefficients of the M time-frequency space units according to the first indication information.

In one possible design, the communication module is further configured to send second indication information, where the second indication information is used to configure a preset channel state information feedback mode; the preset channel state information feedback mode is used for indicating the terminal to detect reference signals of n time units and determining channel state information; the channel state information includes first indication information, and n is an integer greater than 1.

In one possible design, the communication module is further configured to send reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, and the reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources correspond to different time units.

In one possible design, the communication module is further configured to send reference signal resource configuration information, where the reference signal resource configuration information is used to configure a plurality of reference signal resource sets, and the plurality of reference signal resource sets correspond to different time units.

In a ninth aspect, there is provided a communication apparatus comprising: and the processor is used for reading the instructions in the memory and realizing the information feedback method according to the second aspect.

A tenth aspect provides a computer-readable storage medium having stored therein instructions that, when run on a communication apparatus, enable the communication apparatus to execute the information feedback method of the second aspect described above.

In an eleventh aspect, there is provided a computer program product containing instructions which, when run on a communication apparatus, enables the communication apparatus to perform the information feedback method of the second aspect.

In a twelfth aspect, a chip is provided, where the chip includes a processing module and a communication interface, the communication interface is used to receive an input signal and provide the signal to the processing module, and/or is used to output a signal generated by the processing module, and the processing module is used to execute the information feedback method according to the second aspect. In an embodiment, the processing module may execute the code instructions to perform the information feedback method according to the second aspect. The code instructions may come from memory internal to the chip or from memory external to the chip. Alternatively, the processing module may be a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiver pin on a chip.

The technical effects brought by any one of the design manners of the eighth aspect to the twelfth aspect may refer to the beneficial effects of the corresponding methods provided above and the technical effects brought by the design manners, and are not described herein again.

In a thirteenth aspect, a communication system is provided that includes a terminal and a network device. The terminal is configured to execute the information feedback method according to the first aspect. The network device is configured to perform the information feedback method according to the second aspect.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a terminal and a network device according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of an antenna array according to an embodiment of the present application;

fig. 4 is a first flowchart of an information feedback method according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a time-frequency space unit set according to an embodiment of the present disclosure;

fig. 6 is a second flowchart of an information feedback method according to an embodiment of the present application;

fig. 7 is a third flowchart of an information feedback method according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

In the description of this application, "/" means "or" unless otherwise stated, for example, A/B may mean A or B. "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. Further, "at least one" means one or more, "a plurality" means two or more. The terms "first", "second", and the like do not necessarily limit the number and execution order, and the terms "first", "second", and the like do not necessarily limit the difference.

It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

The technical scheme provided by the application can be applied to various communication systems. The technical scheme provided by the application can be applied to a 5G communication system, a future evolution system or a plurality of communication fusion systems and the like, and can also be applied to the existing communication system and the like. The application scenarios of the technical solution provided in the present application may include a variety of scenarios, for example, scenarios such as machine-to-machine (M2M), macro-micro communication, enhanced mobile broadband (eMBB), ultra high reliability and ultra low latency communication (urlclc), and massive internet of things communication (mtc). These scenarios may include, but are not limited to: the communication scene between the terminals, the communication scene between the network equipment and the network equipment, the communication scene between the network equipment and the terminals and the like. The following description is given by taking the scenario in which the technical solution of the present application is applied to network equipment and terminal communication as an example.

In addition, the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

Fig. 1 is a schematic architecture diagram of a communication system to which the technical solution of the present application is applied. As shown in fig. 1, the communication system may include one or more network devices (only 1 shown) and one or more terminals connected to each network device. Fig. 1 is a schematic diagram, and does not limit the application scenarios of the technical solutions provided in the present application.

The network device may be a base station or base station controller for wireless communication, etc. For example, the base station may include various types of base stations, such as: a micro base station (also referred to as a small station), a macro base station, a relay station, an access point, and the like, which are not specifically limited in this embodiment of the present application. In this embodiment, the base station may be a base station (BTS) in a global system for mobile communication (GSM), a Code Division Multiple Access (CDMA), a base station (node B) in a Wideband Code Division Multiple Access (WCDMA), an evolved base station (eNB or e-NodeB) in a Long Term Evolution (LTE), an internet of things (IoT) or a narrowband internet of things (NB-IoT), a base station in a future 5G mobile communication network or a Public Land Mobile Network (PLMN) in a future evolution, which is not limited in this embodiment.

Terminals are used to provide voice and/or data connectivity services to users. The terminal may be referred to by different names, such as User Equipment (UE), access terminal, terminal unit, terminal station, mobile station, remote terminal, mobile device, wireless communication device, terminal agent, or terminal device. Optionally, the terminal 20 may be various handheld devices, vehicle-mounted devices, wearable devices, and computers with communication functions, which is not limited in this embodiment of the present application. For example, the handheld device may be a smartphone. The in-vehicle device may be an in-vehicle navigation system. The wearable device may be a smart band or a Virtual Reality (VR) device. The computer may be a Personal Digital Assistant (PDA) computer, a tablet computer, and a laptop computer.

Fig. 2 is a schematic diagram of hardware structures of a network device and a terminal according to an embodiment of the present application.

The terminal comprises at least one processor 101 and at least one transceiver 103. Optionally, the terminal may also include an output device 104, an input device 105, and at least one memory 102.

The processor 101, memory 102 and transceiver 103 are connected by a bus. The processor 101 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure. The processor 101 may also include multiple CPUs, and the processor 101 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, or processing cores that process data (e.g., computer program instructions).

Memory 102 may be a read-only memory (ROM) or other type of static storage device that may store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that may store information and instructions, but is not limited to, electrically erasable programmable read-only memory (EEPROM), compact disk read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 102 may be a separate device and is connected to the processor 101 via a bus. The memory 102 may also be integrated with the processor 101. The memory 102 is used for storing application program codes for executing the scheme of the application, and the processor 101 controls the execution. The processor 101 is configured to execute the computer program code stored in the memory 102, thereby implementing the methods provided by the embodiments of the present application.

The transceiver 103 may use any transceiver or other device for communicating with other devices or communication networks, such as ethernet, Radio Access Network (RAN), Wireless Local Area Networks (WLAN), etc. The transceiver 103 includes a transmitter Tx and a receiver Rx.

The output device 104 is in communication with the processor 101 and may display information in a variety of ways. For example, the output device 104 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 105 is in communication with the processor 101 and may receive user input in a variety of ways. For example, the input device 105 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.

The network device comprises at least one processor 201, at least one memory 202, at least one transceiver 203 and at least one network interface 204. The processor 201, memory 202, transceiver 203 and network interface 204 are connected by a bus. The network interface 204 is configured to connect with a core network device through a link (e.g., an S1 interface), or connect with a network interface of another network device through a wired or wireless link (e.g., an X2 interface) (not shown in the drawings), which is not specifically limited in this embodiment of the present invention. In addition, the description of the processor 201, the memory 202 and the transceiver 203 may refer to the description of the processor 101, the memory 102 and the transceiver 103 in the terminal, and will not be repeated herein.

To facilitate understanding of the embodiments of the present application, the following description is made.

First, the embodiments of the present application relate to the meaning of the main parameters:

(1)N_s: the length of the spatial basis vector, i.e., the number of elements contained in the spatial basis vector. In the embodiment of the present application, the vectorThe length of (c) may also be referred to as a dimension of a vector, and is herein collectively described, and will not be further described below.

(2)N_f: the length of the frequency-domain basis vector, i.e. the number of elements the frequency-domain basis vector contains.

(3)N_t: the length of the time-domain basis vector, i.e. the number of elements the time-domain basis vector contains.

(4) F: frequency domain basis vectors. Illustratively, in a two-dimensional coordinate system, F may be transformed into

In a three-dimensional coordinate system, F can be transformed into

(5) A: a time domain basis vector. Illustratively, in a two-dimensional coordinate system, A may be transformed into

In a three-dimensional coordinate system, A can be transformed into

(6) S: and (5) spatial domain basis vectors. Illustratively, in a two-dimensional coordinate system, S may be transformed into

In a three-dimensional coordinate system, S can be transformed into

Secondly, the meaning of the operation symbol in the formula related to the embodiment of the application is as follows:

(1) the angle symbol H denotes a conjugate transpose, e.g. i^HIs the conjugate transpose of the vector (or matrix) u.

(2) The corner mark T representing a transpose, e.g. u^TIs the transpose of the vector (or matrix) u.

(3)

Is the conjugate of the vector (or matrix) u.

(4)

Representing the Kronecker product. The detailed definition of the kronecker product can be referred to the prior art and is not described herein.

(5) Combination, which is a combination of m (m ≦ n) elements arbitrarily taken from n different elements as a group, is called a combination of m elements taken from n different elements. The number of combinations of m elements taken out of n different elements is

(6)

Indicating rounding up.

Third, in the embodiment of the present application, it is described that any vector (e.g., a space domain basis vector, a frequency domain basis vector, a time domain basis vector, etc.) is a column vector, and the description is unified here and will not be repeated herein. It is understood that, in particular implementations, the arbitrary vector may also be a row vector. According to the technical solutions provided by the present application, those skilled in the art should be able to reasonably presume that any vector is a row vector without creative efforts, and the corresponding technical solutions are not described herein. Furthermore, in the specific implementation process, the form of the vector used herein may be adjusted according to specific needs, for example, the vector is transposed, or the vector is represented as a conjugate of the vector, or a combination of the foregoing and other manners. Accordingly, the various conjectures and adjustments described above should be understood to fall within the scope of the embodiments of the present application.

Fourth, in the present embodiment, for convenience of description, when numbering is referred to, numbering may be continued from 0. For example, the M time-frequency space units include the 0 th time-frequency space unit to the M-1 st time-frequency space unit, and so on, which are not illustrated one by one here. Of course, the specific implementation is not limited to this, and for example, the numbers may be sequentially numbered from 1. It should be understood that the above descriptions are provided for convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Fifth, in the present embodiment, "for indicating" may include for direct indication and for indirect indication. For example, when a certain indication information is described as the indication information I, the indication information may be included to directly indicate I or indirectly indicate I, and does not necessarily represent that I is carried in the indication information.

If the information indicated by the indication information is referred to as information to be indicated, in a specific implementation process, there are many ways of indicating the information to be indicated, for example, but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or an index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein an association relationship exists between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other part of the information to be indicated is known or predetermined. For example, the indication of the specific information may be implemented by means of a predetermined arrangement order of the respective information (e.g., protocol specification), thereby reducing the indication overhead to some extent. Meanwhile, the universal parts of all information can be identified and indicated in a unified mode, so that the indicating overhead caused by independently indicating the same information is reduced. For example, it will be understood by those skilled in the art that the precoding matrix is composed of precoding vectors, and that each precoding vector in the precoding matrix may have the same components in terms of composition or other attributes.

The specific indication method may be any of various existing indication methods, such as, but not limited to, the above indication methods, various combinations thereof, and the like. The specific details of various indication modes can refer to the prior art, and are not described in detail herein. As can be seen from the above description, when a plurality of information of the same type are required to be indicated, for example, different information may be indicated differently. In a specific implementation process, a required indication manner may be selected according to a specific need, and the indication manner selected in the embodiment of the present application is not limited, so that the indication manner related to the embodiment of the present application should be understood to cover various methods that enable a party to be indicated to obtain information to be indicated.

In addition, other equivalent forms of the information to be indicated may exist, for example, a row vector may be represented as a column vector, a matrix may be represented by a transposed matrix of the matrix, a matrix may also be represented as a vector or an array, the vector or the array may be formed by connecting each row vector or column vector of the matrix, a kronecker product of two vectors may also be represented as a product of one vector and a transposed vector of another vector, and the like. The technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, reference to some or all of the features in the embodiments of the present application should be understood to encompass various manifestations of such features.

The information to be indicated may be sent together as a whole, or may be sent separately by dividing into a plurality of pieces of sub information, and the sending periods and/or sending timings of these pieces of sub information may be the same or different. Specific transmission method this application is not limited. The sending period and/or sending timing of the sub information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example and without limitation, one or a combination of at least two of radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as Downlink Control Information (DCI).

To facilitate understanding of the technical solutions of the present application, some terms related to the embodiments of the present application are briefly described below.

1. Space domain basis vector

Each spatial basis vector may correspond to a transmit beam (beam) of the transmitting end device.

Spatial basis vectors are typically associated with antenna arrays, for example, many of the parameters involved in the spatial basis vector expression may be understood to be different attributes that characterize an antenna array. Therefore, in order to facilitate understanding of the spatial basis vectors according to the embodiments of the present application, the spatial basis vectors will be described below in conjunction with the antenna array. However, those skilled in the art should understand that the spatial basis vectors involved in the embodiments of the present application are not limited to a specific antenna array. In a specific implementation process, a suitable antenna array may be selected according to specific needs, and various parameters related to the space-domain basis vector in the embodiment of the present application may be set based on the selected antenna array.

Fig. 3 is a schematic diagram of an antenna array 300 that may be suitable for use in an embodiment of the present application. As shown in fig. 3, the antenna array 300 includes a plurality of element groups 302, and the element groups 302 are arranged in a matrix. Specifically, each row of the matrix includes a plurality of groups of elements 302, and each column includes a plurality of groups of elements 302. Each element group 302 includes two elements, an element 304 operating in a first polarization direction and an element 306 operating in a second polarization direction.

In a specific implementation process, the spatial domain basis vector may be obtained by a kronecker product of two vectors, where the two vectors respectively represent spatial domain characteristics of two dimensions of a spatial domain. For example, in conjunction with fig. 3, the two dimensions may be the dimension in which the rows and the dimension in which the columns of the matrix formed by the element groups 302 shown in fig. 3 are located.

In the embodiment of the present application, the dimension of the spatial basis vector is N_SI.e. a space-domain basis vector comprising N_SAnd (4) each element. N is a radical of_SThe number of transmit antenna ports of the transmit-end device in one polarization direction may be used. N is a radical of_S≥2，N_sIs an integer.

2. Frequency domain unit

The unit of the frequency domain resource can represent different frequency domain resource granularities. Exemplary, frequency domain units may include, but are not limited to: a subband, a Resource Block (RB), a subcarrier, a Resource Block Group (RBG), a precoding resource block group (PRG), or the like.

3. Frequency domain basis vectors

The frequency domain basis vectors are used for representing the variation rule of the channel in the frequency domain. The frequency domain basis vectors may be specifically used to represent the variation rule of the weighting coefficients of each spatial basis vector in each frequency domain unit. The change rule represented by the frequency domain basis vector is related to factors such as multipath time delay and the like. It will be appreciated that as a signal is transmitted through a wireless channel, there may be different transmission delays of the signal on different transmission paths. The law of the channel variation in the frequency domain caused by different propagation delays can be characterized by different frequency domain basis vectors.

In the embodiment of the application, the dimension of the frequency domain basis vector is N_fI.e. a frequency domain basis vector containing N_fAnd (4) each element.

Alternatively, the dimension of the frequency-domain basis vector may be equal to the number of frequency-domain units for which CSI measurements are required. Since the number of frequency domain elements that need to make CSI measurements at different time instants may differ, the dimensionality of the frequency domain basis vectors may also differ. In other words, the dimensions of the frequency domain basis vectors are variable.

Optionally, the dimension of the frequency-domain basis vector may also be equal to the number of frequency-domain units comprised by the available bandwidth of the terminal. Wherein the available bandwidth of the terminal may be configured by the network device. The available bandwidth of a terminal is a part or all of the system bandwidth. The available bandwidth of the terminal may also be referred to as a bandwidth part (BWP), which is not limited in this embodiment of the present application.

Optionally, the length of the frequency domain basis vector may also be equal to the length of a signaling used for indicating the position and number of the frequency domain units to be reported. For example, in NR, the signaling for indicating the location and number of frequency domain units to be reported may be reporting bandwidth (reporting band). The signaling may indicate the locations and the number of the frequency domain units to be reported in the form of a bitmap, for example. Thus, the dimension of the frequency domain basis vectors may be the number of bits of the bitmap.

4. Time cell

The time unit includes at least one Time Interval (TI) in a time domain, where the TI may be a Transmission Time Interval (TTI) in an LTE system, or a symbol-level short TTI, or a slot, a mini-slot, or an Orthogonal Frequency Division Multiplexing (OFDM) symbol in a 5G system. The embodiment of the present application does not limit this.

5. Time domain basis vector

The time domain basis vector is used for representing the variation rule of the channel in the time domain. That is, the time-domain basis vectors are used to characterize the time-variability of the channel. Time-varying of a channel refers to the variation of the transfer function of the channel over time. The time-varying property of the channel is related to Doppler shift (Doppler shift) and other factors.

In the embodiment of the application, the dimension of the time domain basis vector is N_tI.e. a time-domain basis vector containing N_tAnd (4) each element.

Alternatively, the dimension of the time-domain basis vector may be equal to the number of time units for which CSI measurements are required. It can be understood that, since the number of time units required for CSI measurement may be different in different scenarios, the dimension of the time-domain basis vector may also be different. In other words, the dimension of the temporal basis vectors is variable.

6. Time frequency unit

A time-frequency unit is determined based on a time-domain basis vector and a frequency-domain basis vector. In the embodiment of the present application, the time-frequency unit may be a time-frequency matrix or a time-frequency vector. It is understood that the time-frequency matrix and the time-frequency vector may be transformed to each other and may be determined by the same time-frequency basis vector and the same frequency-domain basis vector, and thus the time-frequency matrix and the time-domain vector are equivalent.

The time-frequency matrix may be of dimension N_t×N_fOf the matrix of (a). Optionally, the time-frequency matrix may be determined by, but is not limited to, any of the following formulas:

wherein v is₁Representing time frequency units.

The time-frequency vector may be of length N_t×N_fThe vector of (2). Can be used forOptionally, the time-frequency vector may be determined by, but is not limited to, any of the following formulas:

the above formula is merely an example provided in the embodiment of the present application, and the determination formula of the time frequency unit in the embodiment of the present application is not specifically limited.

In addition, the time-frequency unit may also have other names, such as a time-frequency unit. Similarly, the time-frequency vector may also have other names, such as a frequency-time vector. The time-frequency matrix may also have other names, such as a time-frequency matrix. The embodiment of the present application is not particularly limited to this.

7. Space frequency unit

A space-frequency unit is determined based on a space-domain basis vector and a frequency-domain basis vector. In the embodiment of the present application, the space-frequency unit may be a space-frequency matrix or a space-frequency vector. It is understood that the space-frequency matrix and the space-frequency vector can be transformed to each other and can be determined by the same space-domain basis vector and the same frequency-domain basis vector, so that the space-frequency matrix and the space-frequency vector are equivalent.

The space-frequency matrix may be of dimension N_s×N_fOf the matrix of (a). Alternatively, the space-frequency matrix may be determined by, but is not limited to, any of the following equations:

wherein v is₂Representing a space-frequency unit.

The space-frequency vector may be of length N_t×N_fThe vector of (2). Alternatively, the space-frequency vector may be determined by, but is not limited to, any of the following equations:

the above formula is merely an example provided in the embodiment of the present application, and the determination formula of the air frequency unit in the embodiment of the present application is not specifically limited.

In addition, the space-frequency unit may also have other names, such as a frequency space unit. Similarly, the space-frequency vector may also have other names, such as a frequency-space vector. The space-frequency matrix may also have other names, such as a frequency-space matrix. The embodiment of the present application is not particularly limited to this.

8. Space-time unit

The space-time unit is used for representing the change rule of the channel in two dimensions of a time domain and a space domain. A space-time unit is determined based on a time-domain basis vector and a space-domain basis vector. In the embodiment of the present application, the spatio-temporal unit may be a spatio-temporal matrix or a spatio-temporal vector. It is understood that both the space-time matrix and the space-time vector may be determined by the same time-domain basis vector and the same space-domain basis vector, and that the space-time matrix and the space-time vector may be transformed to each other, and thus are equivalent.

The space-time matrix may be of dimension N_s×N_tOf the matrix of (a). Alternatively, the spatio-temporal matrix may be determined, but is not limited to, by any of the following equations:

wherein v is₃Representing a spatiotemporal unit.

The space-time vector may be of length N_t×N_fThe vector of (2). Alternatively, the spatio-temporal vector may be determined by, but is not limited to, any of the following equations:

In addition, the spatio-temporal units may also have other names, such as spatio-temporal units. Similarly, the space-time vector may also have other names, such as space-time vector. The spatio-temporal matrix may also have other names, such as a spatio-temporal matrix. The embodiment of the present application is not particularly limited to this.

9. Time-frequency space unit

The time-frequency space unit is used for representing the change rule of the channel in three dimensions of time domain, frequency domain and space domain. A time-frequency space cell is defined by a time-domain basis vector, a frequency-domain basis vector, and a space-domain basis vector. Alternatively, a time-frequency space-unit is determined based on a time-domain basis vector and a space-frequency unit. Alternatively, a time-frequency space element is determined based on a frequency-domain basis vector and a time-frequency element. Alternatively, a time-frequency bin is determined based on a space-domain basis vector and a time-frequency bin.

In a specific implementation, the time-frequency space unit is a time-frequency space matrix or a time-frequency space vector. It is understood that the time-frequency space matrix and the time-frequency space vector can be transformed to each other, and the time-frequency space matrix and the time-frequency space vector are equivalent.

The time-frequency space matrix can be a three-dimensional matrix or a two-dimensional matrix. It is understood that a three-dimensional matrix is a matrix having three dimensions, and a two-dimensional matrix is a matrix having two dimensions. For convenience of illustration, if the time-frequency-space matrix is a three-dimensional matrix, the three dimensions of the time-frequency-space matrix will be referred to as time domain dimension, frequency domain dimension and space domain dimension respectively.

If the time-frequency space matrix is a three-dimensional matrix, the number of elements contained in the time-domain dimension of the three-dimensional matrix is N_tThe number of elements contained in the frequency domain dimension is N_fThe number of elements contained in the spatial dimension is: n is a radical of_s. Optionally, the time-frequency-space matrix may be determined by, but is not limited to, any of the following formulas:

wherein the content of the first and second substances,

representing a time-space-time matrix, the time-space-time matrixThe matrix is a three-dimensional matrix.

If the time-frequency space matrix is a two-dimensional matrix, the time-frequency space matrix can have the following three implementation modes:

in the first mode, two dimensions of the time-frequency space matrix can be respectively called as a time-frequency dimension and a space dimension. Wherein, the number of elements contained in the time-frequency dimension of the time-frequency space matrix is N_tN_fThe number of elements contained in the spatial dimension is: n is a radical of_s. The time-frequency-space matrix can be expressed as

In this case, the time-frequency-space matrix may be determined by, but is not limited to, any of the following formulas:

in the second mode, two dimensions of the time-frequency-space matrix can be respectively called as a space-time dimension and a frequency-domain dimension. Wherein, the number of elements contained in the time-frequency space matrix in the space-time dimension is N_tN_sThe number of elements contained in the frequency domain dimension is N_f. The time-frequency-space matrix can be expressed as

and in the third mode, two dimensions of the time-frequency space matrix can be respectively called a space-frequency dimension and a time-domain dimension. Wherein, the number of elements contained in the time-frequency space matrix in the space-frequency dimension is N_sN_fThe number of elements contained in the time-domain dimension is N_t. The time-frequency-space matrix can be expressed as

if the time-frequency space unit is a time-frequency space vector, the length of the time-frequency space vector is N_t×N_f×N_s. Optionally, the time-frequency space vector may be determined by, but is not limited to, any of the following formulas:

wherein, V^allRepresenting time-frequency space vectors.

The above formula is merely an example provided in the embodiment of the present application, and the formula for determining the time-space-frequency unit in the embodiment of the present application is not particularly limited. For example, in the above formula, the time-domain basis vector may be replaced with a conjugate vector of the time-domain basis vector (or a transposed vector, or a conjugated transposed vector), the frequency-domain basis vector may be replaced with a conjugate vector of the frequency-domain basis vector (or a transposed vector, or a conjugated transposed vector), and the time-domain basis vector may be replaced with a conjugate vector of the time-domain basis vector (or a transposed vector, or a conjugated transposed vector).

10. Set of time-domain basis vectors

The set of time-domain basis vectors includes a plurality of time-domain basis vectors. Optionally, any two time-domain basis vectors in the set of time-domain basis vectors are orthogonal.

The time-domain basis vectors in the set of time-domain basis vectors may be represented as:

wherein, O_tAt a predetermined value, O_tIs a positive integer, 0 is not more than m_t≤O_tN_t-1. In the concrete implementation process, O_tIt can be understood as oversampling in one dimension of the time domain.

11. Set of frequency domain basis vectors

The set of frequency-domain basis vectors includes a plurality of frequency-domain basis vectors. Optionally, any two frequency-domain basis vectors in the set of frequency-domain basis vectors are orthogonal.

The frequency-domain basis vectors in the set of frequency-domain basis vectors may be represented as:

wherein, O_fAt a predetermined value, O_fIs a positive integer, 0 is not more than m_f≤O_fN_f-1. In the concrete implementation process, O_fIt can be understood as oversampling in one dimension of the time domain.

12. Set of space-domain basis vectors

The set of spatial basis vectors includes a plurality of spatial basis vectors. Optionally, any two spatial basis vectors in the set of spatial basis vectors are orthogonal.

The spatial basis vectors in the set of spatial basis vectors may be represented as:

wherein, O₁、O₂At a predetermined value, O₁、O₂Are all positive integers, 0 is less than or equal to m₁≤O₁N₁-1，0≤m₂≤O₂N₂-1. In the concrete implementation process, O₁And O₂The effect of (c) can be understood as oversampling in two dimensions of the spatial domain. N is a radical of₁And N₂Which may be used to represent the number of element groups 302 per row (or column) element group 302 and the number of element groups 302 per column (or row) element group 302 in the antenna array 300 shown in fig. 3.

13. Time-frequency unit set, space-frequency unit set, time-space unit set and time-frequency space unit set

The set of time frequency units includes a plurality of time frequency units. In a specific implementation, the time-frequency unit set may be a time-frequency vector set or a time-frequency matrix set. It is to be understood that the set of time frequency vectors comprises a plurality of time frequency vectors and the set of time frequency matrices comprises a plurality of time frequency matrices. Optionally, the time-frequency unit set may be preset, or may be determined according to the time-domain basis vector set and the frequency-domain basis vector set.

The set of space-frequency units includes a plurality of space-frequency units. In a specific implementation, the set of space-frequency units may be a set of space-frequency vectors or a set of space-frequency matrices. It is to be understood that the set of space-frequency vectors comprises a plurality of space-frequency vectors and the set of space-frequency matrices comprises a plurality of space-frequency matrices. Optionally, the space-frequency unit set may be preset, or may be determined according to the space-domain basis vector set and the frequency-domain basis vector set.

The set of spatiotemporal units includes a plurality of spatiotemporal units. In a specific implementation, the set of spatio-temporal units may be a set of spatio-temporal vectors, or a set of spatio-temporal matrices. It is to be understood that the set of space-time vectors comprises a plurality of space-time vectors and the set of space-time matrices comprises a plurality of space-time matrices. Optionally, the set of spatio-temporal units may be preset, or may be determined according to the set of time-domain basis vectors and the set of spatial basis vectors.

The time-frequency space unit set comprises a plurality of time-frequency space units. In a specific implementation, the time-frequency space unit set may be a time-frequency space vector set, or a time-frequency space matrix set. It is understood that the set of time-frequency space vectors includes a plurality of time-frequency space vectors, and the set of time-frequency space matrices includes a plurality of time-frequency space matrices. Optionally, the time-frequency space unit set may be preset, or may be determined according to the time-domain basis vector set, the frequency-domain basis vector set, and the space-domain basis vector set.

14. Weighting coefficient

The weighting coefficients are used to represent the weights of the time-frequency null units in the weighted summation. The weighting coefficients include amplitude and phase. For example, the weighting factor is ae^jθWhere a is the amplitude and θ is the phase.

Optionally, the weighting coefficients fed back to the network device by the terminal are subjected to quantization processing, so as to reduce feedback overhead. It should be noted that the magnitude (or modulus) of the weighting factor may be zero or close to zero. When quantizing the amplitudes of these weighting coefficients whose amplitudes are zero or approximately zero, the quantized values thereof may be zero. If the quantized value of the amplitude of the weighting factor is 0, the weighting factor can be called a weighting factor with zero amplitude. Correspondingly, if the quantized value of the amplitude of the weighting factor is not 0, the weighting factor may be referred to as a weighting factor with nonzero amplitude.

15. Normalization and normalization coefficients

Before quantizing the weighting coefficients, the respective weighting coefficients may be subjected to normalization processing, that is, the absolute values of the respective weighting coefficients are processed as relative values with respect to the normalization coefficients. The normalization coefficient may be configured in advance, or may be one of a plurality of weighting coefficients, for example, the weighting coefficient with the largest amplitude (or modulus).

The following description will take, as an example, a weighting coefficient having the largest amplitude among a plurality of weighting coefficients as a normalization coefficient. For example, the amplitude of the weighting coefficient with the largest amplitude may be classified as 1, and the phase may be classified as 0 or 2 π; the other weighting coefficients are expressed as relative values with respect to the weighting coefficient having the largest amplitude. After normalization, the amplitude of each weighting coefficient has a value in the range of [0, 1], and the phase of each weighting coefficient has a value in the range of [0, 2 π ] or [ - π, π ].

In the embodiments shown below, normalization may determine the maximum weighting factor in units of one polarization direction, in units of one transmission layer (e.g., one or more polarization directions on one transmission layer), or in units of all transmission layers. Thus, normalization can be performed over different ranges for each polarization direction, each transmission layer, or all transmission layers, etc. It should be understood that the unit of normalization is not limited to the above list, and the application is not limited thereto.

16. Reference signal, reference signal resource set

The reference signal includes, but is not limited to, a channel state information reference signal (CSI-RS). The reference signal resource corresponds to at least one of a time domain resource, a frequency domain resource, and a code domain resource of the reference signal. The set of reference signal resources includes one or more reference signal resources.

Taking the reference signal resource as the CSI-RS resource as an example, the CSI-RS resource may be divided into a non-zero power (NZP) CSI-RS resource and a Zero Power (ZP) CSI-RS resource.

The CSI-RS resource may be configured by CSI reporting configuration (CSI reporting setting). The CSI reporting setting may configure a CSI-RS resource set for Channel Measurement (CM). Optionally, the CSI reporting setting may also configure a CSI-RS resource set for Interference Measurement (IM). Optionally, the CSI reporting setting may also configure a set of CSI-RS resources with non-zero power for interference measurement.

The CSI reporting setting may be used to indicate a time domain behavior, a bandwidth, a format corresponding to a report quality (report quality), and the like of CSI reporting. The time domain behavior includes, for example, periodicity (periodic), semi-persistence (semi-persistent), and aperiodicity (aperiodic). The terminal device may generate a CSI report based on a CSI reporting setting.

17. Channel State Information (CSI)

Illustratively, the channel state information may include: at least one of a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), a channel state information reference signal resource indicator (CRI), and a Layer Indicator (LI).

As shown in fig. 4, an information feedback method provided in an embodiment of the present application includes the following steps:

s101, the terminal generates first indication information.

The first indication information is used for indicating M time-frequency space units and weighting coefficients of the M time-frequency space units, and M is a positive integer.

In this embodiment of the present application, a value of M is predefined, or a network device sends configuration information to a terminal to indicate. Optionally, the configuration information may explicitly indicate a value of M, for example, the configuration information includes the value of M. Or, the configuration information implicitly indicates the value of M. For example, in a case where M time-frequency space units are determined according to L space basis vectors, K time-domain basis vectors, and N frequency-domain basis vectors, that is, in a case where M is L × K × N, the configuration information may indirectly indicate a value of M by indicating a value of L, a value of K, and a value of N. Of course, the values of L, K, and N may be indicated by different information. For example, the value of L is indicated by the first information, the value of K is indicated by the second information, and the value of N is indicated by the third information.

It is worth noting that the configuration information, the first information, the second information, and the third information may be carried in RRC signaling, MAC-CE signaling, or DCI, and the embodiment of the present application is not limited thereto.

For convenience of description, information indicating M time-frequency null units in the first indication information is hereinafter referred to as component information, and information indicating weighting coefficients of the M time-frequency null units is hereinafter referred to as coefficient information. That is, the first indication information includes: component information and coefficient information.

Optionally, the component information may be implemented in any one of the following manners:

in the first mode, the component information is used to indicate M time-frequency null units in the time-frequency null unit set.

(1) The component information includes an index of each of the M time-frequency space-time units in the set of time-frequency space-time units.

Thus, assuming that the set of time-frequency null units includes Q time-frequency null units, the overhead of the component information is

(2) The component information includes: and combining indexes of the M time-frequency null units in the time-frequency null unit set.

If the time-frequency space unit set comprises Q time-frequency space units, the combination number of M time-frequency space units is selected from the time-frequency space unit set

It is understood that the combination of M time-frequency space units indicated by the component information is only

One of the combinations. This can be preset between the terminal and the network device

The index of each combination in the combinations, so that the terminal feeds back the indexes of the M time-frequency space unit combinations, and the network equipment can determine the corresponding M time-frequency space units. It will be appreciated that in this case the overhead of the component information is

(3) The component information includes: the index of the time-frequency space unit subset and the index of each time-frequency space unit in the M time-frequency space units in the time-frequency space unit subset.

As the name implies, the time-frequency null unit subset is the subset of the time-frequency null unit set. The set of time-frequency space-cells may include a plurality of subsets of time-frequency space-cells. The network device and the terminal may preset the index of each time-frequency space-unit subset and the time-frequency space-units included in each time-frequency space-unit subset. In this way, the terminal feeds back the index of the time-frequency space unit subset to the network device, so that the network device can know which time-frequency space unit subset the M time-frequency space units are selected from.

Assuming that the time-frequency space-unit set comprises Q time-frequency space-units, the time-frequency space-unit set can be divided into P time-frequency space-unit subsets, each time-frequency space-unit subset comprises Q₁A time-frequency null unit, Q ═ Q₁X P. In this case, the overhead of the component information is:

(4) the component information includes: and the indexes of the time-frequency space unit subsets and the indexes of the combinations of the M time-frequency space units in the time-frequency space unit subsets.

Assuming that the time-frequency space-unit set comprises Q time-frequency space-units, the time-frequency space-unit set can be divided into P time-frequency space-unit subsetsEach time-frequency space-unit subset comprises Q₁A time-frequency null unit, Q ═ Q₁X P. In this case, the number of combinations of M time-frequency space units is selected from the time-frequency space unit subset as

And the index of each combination in each combination is fed back by the terminal, so that the indexes of the M time-frequency space unit combinations in the time-frequency space unit subset are fed back by the terminal, and the network equipment can determine the corresponding M time-frequency space units from the time-frequency space unit subset.

It can be understood that in this case, the overhead of the component information is:

(5) the component information includes: and (4) collecting a bitmap (bitmap) corresponding to the time-frequency space unit. Each q bits in the bitmap corresponding to the time-frequency space unit set correspond to one time-frequency space unit in the time-frequency space unit set, the values of the q bits are used for indicating whether the time-frequency space unit corresponding to the bit belongs to the M time-frequency space units, and q is a positive integer. For example, taking q ═ 1 as an example, if a bit in the bitmap takes a value of "0", the time-frequency space unit corresponding to the bit does not belong to the M time-frequency space units; and if the value of a certain bit in the bitmap is '1', the time-frequency space unit corresponding to the bit belongs to the M time-frequency space units.

It can be understood that, assuming that the time-frequency null unit set includes Q time-frequency null units, the overhead of the component information is Q × Q.

(6) The component information includes: the index of the time-frequency space-time unit subset and the bitmap corresponding to the time-frequency space-time unit subset. Each bit in the bitmap corresponding to the time-frequency space unit subset corresponds to one time-frequency space unit in the time-frequency space unit subset, and the value of each bit is used for indicating whether the time-frequency space unit corresponding to the bit belongs to the M time-frequency space units.

the overhead of the component information in each case is specifically analyzed above. The overhead of other information (e.g., spatial domain basis vector information, frequency domain basis vector information, etc.) may refer to the above analysis, which is described herein in a unified manner and will not be described further below.

And in the second mode, the component information is used for indicating L space-domain basis vectors, K time-domain basis vectors and N frequency-domain basis vectors. Wherein L, K, N are all positive integers. L, K, N are predefined or preconfigured by the network device. In the case where L, K, N is preconfigured by a network device, L, K, N may be indicated by the same information or different information, and the embodiment of the present application is not limited thereto.

For convenience of description, information indicating L spatial basis vectors among the component information is hereinafter simply referred to as spatial basis vector information, information indicating K time-domain basis vectors among the component information is simply referred to as time-domain basis vector information, and information indicating N frequency-domain basis vectors among the component information is simply referred to as frequency-domain basis vector information.

Optionally, the spatial basis vector information may include at least one of:

(1) the index of each space domain base vector in the L space domain base vectors in the space domain base vector set;

(2) the indexes of the combination of the L space-domain basis vectors in the space-domain basis vector set;

(3) the index of the space-domain basis vector subset and the index of each space-domain basis vector in the space-domain basis vector subset in the L space-domain basis vectors;

(4) indexes of the space-domain basis vector subsets and indexes of combinations of the L space-domain basis vectors in the space-domain basis vector subsets;

(5) bitmap corresponding to the space domain base vector set; each q bits in the bitmap corresponding to the spatial basis vector set correspond to one spatial basis vector in the spatial basis vector set, and the values of the q bits are used for indicating whether the corresponding spatial basis vector belongs to the L spatial basis vectors;

(6) indexes of the space domain base vector subsets and bitmaps corresponding to the space domain base vector subsets; each q bits in the bitmap corresponding to the spatial basis vector subset correspond to one spatial basis vector in the spatial basis vector subset, and the value of the q bits is used for indicating whether the corresponding spatial basis vector belongs to the L spatial basis vectors.

Optionally, the time-domain basis vector information may include at least one of the following:

(1) an index of each of the K time-domain basis vectors in the set of time-domain basis vectors;

(2) the indexes of the combination of the K time-domain basis vectors in the time-domain basis vector set;

(3) the index of the time-domain basis vector subset, and the index of each time-domain basis vector in the time-domain basis vector subset in the K time-domain basis vectors;

(4) indexes of the time domain basis vector subsets and indexes of combinations of the K time domain basis vectors in the time domain basis vector subsets;

(5) a bitmap corresponding to the time domain basis vector set; each q bits in a bitmap corresponding to the time domain basis vector set correspond to one time domain basis vector in the time domain basis vector set, and the values of the q bits are used for indicating whether the corresponding time domain basis vector belongs to the K time domain basis vectors;

(6) indexes of the time domain base vector subsets and bitmaps corresponding to the time domain base vector subsets; each q bits in the bitmap corresponding to the time domain basis vector subset correspond to one time domain basis vector in the time domain basis vector subset, and the value of the q bits is used for indicating whether the corresponding time domain basis vector belongs to the K time domain basis vectors.

Optionally, the frequency domain basis vector information may include at least one of:

(1) an index of each of the N frequency-domain basis vectors in the set of frequency-domain basis vectors;

(2) an index of a combination of the N frequency-domain basis vectors into a set of frequency-domain basis vectors;

(3) an index of the subset of frequency domain basis vectors, and an index of each of the N frequency domain basis vectors in the subset of frequency domain basis vectors;

(4) indexes of the frequency domain basis vector subsets and indexes of the combination of the N frequency domain basis vectors in the frequency domain basis vector subsets;

(5) a bitmap corresponding to the frequency domain basis vector set; each q bits in the bitmap corresponding to the frequency domain basis vector set correspond to one frequency domain basis vector in the frequency domain basis vector set, and the values of the q bits are used for indicating whether the corresponding frequency domain basis vector belongs to the N frequency domain basis vectors;

(6) indexes of the frequency domain basis vector subsets and bitmaps corresponding to the frequency domain basis vector subsets; each q bits in the bitmap corresponding to the frequency domain basis vector subset correspond to one frequency domain basis vector in the frequency domain basis vector subset, and the values of the q bits are used for indicating whether the corresponding frequency domain basis vector belongs to the N frequency domain basis vectors.

It should be noted that L space-domain basis vectors, K time-domain basis vectors, and N frequency-domain basis vectors can determine L × K × N time-frequency space units. If L × K × N > M, the component information further includes: first location information indicating locations of the M time-frequency null units in the L K N time-frequency null units.

Optionally, the first location information may include any one of the following:

(1) the device comprises a first bitmap, wherein each q bits in the first bitmap correspond to one time-frequency space unit in L multiplied by K multiplied by N time-frequency space units, and the q bits are used for indicating whether the time-frequency space unit belongs to the M time-frequency space units or not;

(2) the indexes of the combination of the M time-frequency space units in the L multiplied by K multiplied by N time-frequency space units;

(3) the index of each time-frequency space unit in the M time-frequency space units in the L multiplied by K multiplied by N time-frequency space units;

(4) the positions of the space domain basis vectors corresponding to each of the M time-frequency space units in the L space domain basis vectors, the positions of the time domain basis vectors corresponding to each of the M time-frequency space units in the K time domain basis vectors, and the positions of the frequency domain basis vectors corresponding to each of the M time-frequency space units in the N frequency domain basis vectors.

Third, component information is used to indicate L space base vectors and X₁And a time-frequency unit. Wherein, L, X₁Are all positive integers. L, X₁Is predefined or is pre-configured by the network device. At L, X₁When preconfigured by the network device, L, X₁The information may be indicated by the same information or different information, and the embodiment of the present application is not limited thereto.

For convenience of description, information indicating L spatial basis vectors among component information is hereinafter simply referred to as spatial basis vector information, and information indicating X among component information is hereinafter simply referred to as spatial basis vector information₁The information of each time-frequency unit is referred to as time-frequency unit information for short. It should be noted that, for a specific implementation of the spatial basis vector information, reference may be made to the foregoing description, and details are not described herein again.

Optionally, the time-frequency unit information may include at least one of the following:

(1)X₁the index of each time-frequency unit in the time-frequency unit set;

(2)X₁the index of the combination of the time frequency units in the time frequency unit set;

(3) index of time-frequency unit subset, and X₁The index of each time-frequency unit in the time-frequency unit subset;

(4) index of time-frequency unit subset toAnd X₁The index of the combination of the time-frequency units in the time-frequency unit subset;

(5) a bitmap corresponding to the time-frequency unit set; wherein, every q bits in the bitmap corresponding to the time frequency unit set correspond to a time frequency unit in the time frequency unit set, and the values of the q bits are used for indicating whether the corresponding time frequency unit belongs to the X or not₁A time-frequency unit;

(6) the index of the time-frequency unit subset and the bitmap corresponding to the time-frequency unit subset; wherein, each q bits in the bitmap corresponding to the time-frequency unit subset correspond to a frequency domain basis vector in the time-frequency unit subset, and the value of the q bits is used for indicating whether the corresponding time-frequency unit belongs to the X or not₁And a time-frequency unit.

L space base vectors and X₁One time-frequency unit can determine LxX₁And a time-frequency empty cell. If L X₁>M, then the component information further includes: second location information indicating that M time-frequency space units are at LxX₁A position in each time-frequency space cell.

Optionally, the second location information may include at least one of:

(1) a second bitmap of every q bits and LxX₁One of the time-frequency space units corresponds to one of the M time-frequency space units, and the q bits are used for indicating whether the corresponding time-frequency space unit belongs to the M time-frequency space units or not;

(2) the combination of M time-frequency null units is at L X₁Indices in individual time-frequency space-units;

(3) each time-frequency space unit in M time-frequency space units is at L multiplied by X₁Indices in individual time-frequency space-units;

(4) the position of the space domain base vector corresponding to each time-frequency space unit in the M time-frequency space units in the L space domain base vectors and the position of the time-frequency unit corresponding to each time-frequency space unit in the X space domain base vector₁Position in each time-frequency unit.

Mode four, component information is used to indicate K time-domain basis vectors and X₂And a space frequency unit. Wherein L is、X₂Are all positive integers. L, X₂Is predefined or is pre-configured by the network device. At L, X₂When preconfigured by the network device, L, X₂The information may be indicated by the same information or different information, and the embodiment of the present application is not limited thereto.

For convenience of description, information indicating K time-domain basis vectors in component information is hereinafter simply referred to as time-domain basis vector information, and information indicating X in component information is hereinafter simply referred to as time-domain basis vector information₂The information of each space-frequency unit is simply referred to as space-frequency unit information. It should be noted that, for a specific implementation of the time-domain basis vector information, reference may be made to the foregoing description, and details are not described herein again.

Optionally, the space-frequency unit information may include at least one of the following:

(1)X₂an index of each of the plurality of space-frequency units in the set of space-frequency units;

(2)X₂an index of a combination of space-frequency units in a set of space-frequency units;

(3) indices of subsets of space-frequency units, and X₂An index of each of the plurality of space-frequency units in the subset of space-frequency units;

(4) indices of subsets of space-frequency units, and X₂An index of a combination of space-frequency units in a subset of space-frequency units;

(5) a bitmap corresponding to the space-frequency unit set; wherein, every q bits in the bitmap corresponding to the space-frequency unit set correspond to one space-frequency unit in the space-frequency unit set, and the values of the q bits are used for indicating whether the corresponding space-frequency unit belongs to the X or not₂A plurality of space-frequency units;

(6) indexes of the space-frequency unit subsets and bitmaps corresponding to the space-frequency unit subsets; wherein, each q bits in the bitmap corresponding to the space-frequency unit subset correspond to a frequency domain basis vector in the space-frequency unit subset, and the value of the q bits is used for indicating whether the corresponding space-frequency unit belongs to the X or not₂And a space frequency unit.

In addition, K time-domain basis vectors and X₂A space frequencyThe unit being able to determine KxX₂And a time-frequency empty cell. If K X₂>M, then the component information further includes: third position information indicating that the M time-frequency space units are at KxX₂A position in each time-frequency space cell.

Optionally, the third location information may include at least one of:

(1) a third bitmap, each q bits in the third bitmap corresponding to KxX₂One of the time-frequency null units, the q bits being used to indicate whether the corresponding time-frequency null unit belongs to the M time-frequency null units;

(2) the combination of M time-frequency null units is K multiplied by X₂Indices in individual time-frequency space-units;

(3) each time-frequency space unit KxX in M time-frequency space units₂Indices in individual time-frequency space-units;

(4) the position of the time domain basis vector corresponding to each time-frequency space unit in the M time-frequency space units in the K time domain basis vectors and the position of the space-frequency unit corresponding to each time-frequency space unit in the X time-frequency space unit₂A position in a space frequency unit.

Mode five, component information is used to indicate N frequency domain basis vectors and X₃And a space-time unit. Wherein, L, X₂Are all positive integers. L, X₂Is predefined or is pre-configured by the network device. At L, X₂When preconfigured by the network device, L, X₂The information may be indicated by the same information or different information, and the embodiment of the present application is not limited thereto.

For convenience of description, information indicating N frequency-domain basis vectors in component information is hereinafter simply referred to as frequency-domain basis vector information, and information indicating X in component information is hereinafter simply referred to as frequency-domain basis vector information₃The information of the individual spatio-temporal units is simply referred to as spatio-temporal unit information. It should be noted that, for a specific implementation of the frequency domain basis vector information, reference may be made to the foregoing description, and details are not described herein again.

Optionally, the spatiotemporal unit information may include at least one of:

(1)X₃an index of each of the spatiotemporal units in the set of spatiotemporal units;

(2)X₃an index of combinations of spatiotemporal units in a set of spatiotemporal units;

(3) indices of subsets of spatio-temporal units, and X₃An index of each of the spatio-temporal units in a subset of the spatio-temporal units;

(4) indices of subsets of spatio-temporal units, and X₃An index of combinations of spatio-temporal units in a subset of spatio-temporal units;

(5) the time-space unit sets corresponding bitmaps; wherein, each q bits in the bitmap corresponding to the spatiotemporal unit set correspond to a spatiotemporal unit in the spatiotemporal unit set, and the values of the q bits are used for indicating whether the corresponding spatiotemporal unit belongs to the X or not₃A spatio-temporal unit;

(6) indexes of the space-time unit subsets and bitmaps corresponding to the space-time unit subsets; wherein each bit in the bitmap corresponding to the subset of space-time units corresponds to a frequency domain basis vector in the subset of space-time units, and the value of each bit is used for indicating whether the corresponding space-time unit belongs to the X₃And a space-time unit.

N frequency-domain basis vectors and X₃The space-time unit can determine NxX₃And a time-frequency empty cell. If NxX₃>M, then the component information further includes: fourth position information indicating that M time-frequency null units are at NxX₃A position in each time-frequency space cell.

Optionally, the fourth location information may include at least one of:

(1) a fourth bitmap, each q bits in the fourth bitmap corresponding to NxX₃One of the time-frequency null units, the q bits being used to indicate whether the corresponding time-frequency null unit belongs to the M time-frequency null units;

(2) the combination of M time-frequency null units is at NxX₃Indices in individual time-frequency space-units;

(3) each time-frequency space unit NxX in M time-frequency space units₃One hourAn index in a frequency space unit;

(4) the position of the frequency domain basis vector corresponding to each time-frequency space unit in the M time-frequency space units in the N time-domain basis vectors and the position of the time-space unit corresponding to each time-frequency space unit in the X time-space unit₃A position in a spatiotemporal unit.

The above is an introduction to the component information, and in a specific implementation, the terminal may also implement the component information in other ways, which is not limited in this embodiment of the present application.

It can be understood that the terminal specifically adopts any one of the first to fifth modes to implement the component information, which may be defined by a protocol, or determined by mutual negotiation between the terminal and the network device, or pre-configured by the network device to the terminal, and the embodiment of the present application is not limited thereto.

In this embodiment of the present application, none of the quantized values of the amplitudes of the weighting coefficients of the M time-frequency space units is zero. In other words, the weighting coefficients of the M time-frequency space units are all weighting coefficients with nonzero amplitude.

In this case, the coefficient information may be implemented in any one of the following ways:

(1) the coefficient information includes: quantization information for each of the M weighting coefficients.

Wherein the quantization information of the weighting coefficients comprises quantization information of amplitude and quantization information of phase. The quantization information of the amplitude may be a quantization value of the amplitude, or may be an index of the quantization value of the amplitude. The quantization information of the phase may be a quantization value of the phase or an index of the quantization value of the phase.

(2) The coefficient information includes: position information of one or more normalization coefficients, and quantization information of each of the M weighting coefficients other than the normalization coefficient.

Alternatively, the position information of the normalization coefficient may be an index of the normalization coefficient among the M weighting coefficients. For example, the M weighting coefficients may be numbered in a predefined order and the position of the normalization coefficient may be indicated by the index of the normalization coefficient.

In an embodiment of the present application, the one or more normalization coefficients may be: a first normalization coefficient, one or more second normalization coefficients, and/or one or more third normalization coefficients.

Optionally, the first normalization coefficient may be a weighting coefficient with the largest amplitude among the M weighting coefficients. The first normalization coefficient is used for performing normalization processing on each weighting coefficient in the M weighting coefficients.

The second normalization coefficient and the third normalization coefficient are described below with reference to fig. 5. Fig. 5 is a schematic diagram of a time-frequency space unit set provided in the embodiment of the present application. FIG. 5 illustrates a three-dimensional coordinate system and the locations of time-frequency void cells in a set of time-frequency void cells in the three-dimensional coordinate system. Where f represents the frequency domain dimension, s represents the spatial domain dimension, and t represents the time domain dimension. Each circle represents a time-frequency void cell. The time-frequency empty units represented by the black circles do not belong to the M time-frequency empty units, and the time-frequency empty units represented by the white circles belong to the M time-frequency empty units.

The second normalization coefficient may be a weighting coefficient with the largest amplitude among the weighting coefficients corresponding to the time-frequency space units on the same plane in the M time-frequency space units. And the second normalization coefficient is used for normalizing the weighting coefficients corresponding to the time-frequency space units in the same plane in the M time-frequency space units.

It can be understood that the plane may be a plane formed by a time domain dimension and a space domain dimension in a three-dimensional coordinate system, may also be a plane formed by a time domain dimension and a frequency domain dimension, and may also be a plane formed by a frequency domain dimension and a space domain dimension

The third normalization coefficient may be a weighting coefficient with the largest amplitude among the weighting coefficients corresponding to the time-frequency null units in the same row among the M time-frequency null units. And the third normalization coefficient is used for normalizing the weighting coefficients corresponding to the time-frequency null units in the same row in the M time-frequency null units.

It is understood that the above-mentioned row may be a row in the frequency domain dimension, a row in the time domain dimension, or a row in the spatial domain dimension.

Optionally, if the first normalization coefficient and the second normalization coefficient exist in the coefficient information at the same time, it is described that the M weighting coefficients adopt multi-level quantization. Wherein the first stage is to quantize the relative value of the second normalized coefficient determined by the first normalized coefficient processing. The second stage of quantization is to quantize the relative values of the weighting coefficients determined by the second normalization coefficient processing. Therefore, in this case, the coefficient information may further include: quantization information of the second normalized coefficient.

Optionally, if the first normalization coefficient and the third normalization coefficient exist in the coefficient information at the same time, it is described that the M weighting coefficients adopt multi-level quantization. Wherein the first-stage quantization is to quantize a relative value of the third normalization coefficient determined through the first normalization coefficient processing. The second stage of quantization is to quantize the relative values of the weighting coefficients determined by the third normalization coefficient process. Therefore, in this case, the coefficient information may further include: quantization information of the third normalization coefficient.

Optionally, if the second normalization coefficient and the third normalization coefficient exist in the coefficient information at the same time, it is indicated that the M weighting coefficients adopt multi-level quantization. Wherein the first-stage quantization is to quantize a relative value of a third normalization coefficient determined through the second normalization coefficient processing. The second-stage quantization is to quantize the relative values of the weighting coefficients determined through the third normalization coefficient processing. Therefore, in this case, the coefficient information may further include: quantization information of the third normalization coefficient.

Optionally, if the first normalization coefficient, the second normalization coefficient, and the third normalization coefficient exist in the coefficient information at the same time, it is indicated that the M weighting coefficients adopt multi-level quantization. Wherein the first-stage quantization is to quantize a relative value of the second normalization coefficient determined through the first normalization coefficient processing. The second-stage quantization is to quantize the relative value of the third normalization coefficient determined through the second normalization coefficient processing. The third-stage quantization is to quantize the relative values of the weighting coefficients determined through the third normalization coefficient processing. Therefore, in this case, the coefficient information may further include: quantization information for the second normalized coefficient and quantization information for the third normalized coefficient.

Note that, the arrangement order of the respective weighting coefficients in the coefficient information may be defined in advance. In this way, the terminal or the network device can respectively indicate and analyze the quantization information of the respective weighting coefficients based on the same arrangement order.

Optionally, the first indication information is further used to indicate R time-frequency space units. The amplitude of the weighting coefficients of the R time-frequency null units is zero. Or, the quantized value of the amplitude of the weighting coefficients of the R time-frequency space units is zero.

It can be understood that how the first indication information indicates the R time-frequency space units may refer to the foregoing description, and is not described herein again.

In addition, because the amplitude of the weighting coefficient corresponding to the R time-frequency space units is zero, the first indication information may not indicate the weighting coefficient corresponding to the R time-frequency space units, so as to reduce signaling overhead.

Of course, the first indication information may also indicate the weighting coefficients of the R time-frequency space units. Thus, the coefficient information is actually used to indicate the weighting coefficients of the M + R time-space units. In this case, the system information may be implemented in any one of the following manners:

(1) the system information includes: quantization information for each of the M + R weighting coefficients.

(2) The system information includes: position information of one or more normalization coefficients, and quantization information of each of the M + R weighting coefficients other than the normalization coefficients.

(3) The coefficient information includes: position information of one or more normalization coefficients, and quantization information of each of the M weighting coefficients other than the normalization coefficients.

Optionally, in the above manners (1) to (3), the coefficient information is further used to indicate a value of R. That is, the coefficient information is also used to indicate the number of weighting coefficients with non-zero amplitude among the M + R weighting coefficients.

Optionally, in the above modes (1) to (3), the coefficient information further includes a bitmap, where the bitmap is used to indicate the number and the position of the weighting coefficients with nonzero amplitude in the M + R weighting coefficients, and the number and the position of the weighting coefficients with zero amplitude.

It should be noted that, for the specific description of the coefficient information used for indicating the weighting coefficients of the M + R time-frequency space units, reference may be made to the specific description of the coefficient information used for indicating the weighting coefficients of the M time-frequency space units in the foregoing, and details are not repeated here.

S102, the terminal sends first indication information to the network equipment.

The first indication information may be carried in a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH).

Optionally, the first indication information may be a PMI, or a partial cell in the PMI, or other indication information besides the PMI, and the embodiment of the present application is not limited thereto.

For a specific implementation manner of step S102, reference may be made to the prior art, which is not described herein again.

S103, the network equipment determines the M time-frequency space units and the weighting coefficients corresponding to the M time-frequency space units according to the first indication information.

Then, the network device may construct a precoding matrix (or a precoding vector) according to the M time-frequency null units and the M time-frequency null units. The codebook for constructing the precoding matrix (or the precoding vector) may be a time-frequency-space codebook as described below. It is understood that the time-frequency space codebook is only an exemplary name provided for distinguishing from the type I codebook and the type II codebook, and the time-frequency space codebook may also have other names, which is not limited in this application.

The time-frequency space codebook may be:

α_mthe M-th weighting coefficient in the M weighting coefficients; v_mThe number of the M time-frequency space units is the mth time-frequency space unit; v_mH is a precoding matrix when the matrix is a time-frequency space matrix; v_mAnd H is a precoding vector when the vector is a time-frequency space vector.

The above formula (1) can be modified to the following formula (2) or (6). Wherein, in the formula (2),

is a pre-coding matrix, the pre-coding matrix is a three-dimensional matrix; in the formula (3), H^allIs a precoding vector. In the formulas (4) to (6),

each represents a precoding matrix, which is a two-dimensional matrix.

Alternatively, the above formula (2) may be further modified to the following formula (7).

Wherein the content of the first and second substances,

the L-th space base vector of the L space base vectors;

is the nth frequency domain basis vector in the N frequency domain basis vectors;

is the kth time domain basis vector in the K time domain basis vectors; alpha is alpha_n,l,kAnd weighting coefficients corresponding to the ith space domain basis vector, the nth frequency domain basis vector and the kth time domain basis vector.

Based on the technical scheme shown in fig. 4, each time-frequency space unit of the M time-frequency space units indicated by the first indication information is determined according to a frequency-domain basis vector, a time-domain basis vector and a space-domain basis vector, and the time-domain basis vector can represent a change rule of a channel in a time domain, so that a precoding matrix (or a precoding vector) determined by the M time-frequency space units indicated by the first indication information and the M weighting coefficients can match a channel changed by a terminal along with time change, and normal communication between the network device and the terminal is ensured.

Optionally, as shown in fig. 6, before step S101, the method may further include step S201.

S201, the network equipment sends second indication information to the terminal.

The second indication information is used for configuring a preset channel state information feedback mode. That is, after the terminal receives the second indication information, the terminal adopts a preset channel state information feedback mode.

The preset channel state information feedback mode is used for indicating the terminal to detect the reference signals of n time units and determining the channel state information. Wherein the channel state information includes first indication information.

In this embodiment, the value of n may be predefined, or set by the network device by sending configuration information to the terminal. In this embodiment of the present application, the configuration information may indicate a value of n in an explicit manner, for example, the configuration information includes the value of n. Alternatively, the configuration information may indicate the value of n in an implicit manner, for example, the configuration information indirectly configures the value of n by configuring the number of reference signal resources. For example, if the configuration information configures 3 reference signal resources, the value of n is 3. It can be understood that, in the embodiment of the present application, which information is specifically included in the configuration information to indicate the value of n is not limited. In addition, the configuration information may be the second indication information or other information, and the embodiment of the present application is not limited thereto.

Optionally, the n time units may be continuous or discontinuous. For example, assuming that n is 3, and n time units are OFDM symbol #1, OFDM symbol #2, and OFDM symbol # 3; alternatively, the n time cells are OFDM symbol #1, OFDM symbol #3, and OFDM symbol # 5.

As an implementation manner, the second indication information may be carried in codebook indication information, where the codebook indication information is used to indicate a type of a codebook used by the terminal. Optionally, the codebook types include a type I codebook, a type II codebook, and a time-frequency space codebook provided in this embodiment. It can be understood that, if the codebook indication information carries the second indication information, the codebook indication information is used for indicating the terminal to use a time-frequency space codebook.

Optionally, the second indication information may be carried in RRC signaling, MAC CE signaling, or DCI.

Based on the technical scheme shown in fig. 6, the network device sends the second indication information to the terminal to trigger the terminal to adopt the preset channel state information feedback mode, so that the terminal can feed back the channel state information based on n time units, a precoding matrix (or a precoding vector) adopted by the network device can be matched with a channel changed by the terminal along with time, and normal communication between the network device and the terminal is ensured.

Optionally, as shown in fig. 7, before step S101, the method may further include step S301.

S301, the network equipment sends the reference signal resource configuration information to the terminal.

Wherein the reference signal resource configuration information is used for configuring reference signal resources. The reference signal resource configuration information may be carried in RRC signaling, MAC CE signaling, or DCI.

In an embodiment of the present application, the reference signal resource may be a CSI-RS resource, and the reference signal resource set may be a CSI-RS resource set. The reference signal resource configuration information may be the CSI reporting setting or a part of cells in the CSI reporting setting.

Optionally, the reference signal resource configuration information at least includes one of the following situations:

in case one, the reference signal resource configuration information is used to configure a plurality of reference signal resource sets, where the plurality of reference signal resource sets correspond to different time units. That is, one set of reference signal resources corresponds to one time unit. Thus, if two reference signal resources belong to different reference signal resource sets, the two reference signal resources correspond to different time units. If two reference signal resources belong to the same reference signal resource set, the two reference signal resources correspond to the same time unit.

In case two, the reference signal resource configuration information is used to configure a reference signal resource set, where the reference signal resource set includes a plurality of reference signal resources, and the plurality of reference signal resources correspond to different time units.

It can be understood that the multiple reference signal resources correspond to different time units, specifically, the configurations of the multiple reference signal resources on the time domain resource are different. For example, multiple reference signal resources in the same reference signal resource set may be configured with the same time domain start symbol, and different time domain offset values.

It should be noted that the time domain resource corresponding to the reference signal resource may be determined by the time domain start symbol and the time domain offset value. The time domain offset value is used for indicating a difference value between a time domain resource corresponding to the reference signal resource and a time domain starting symbol. For example, if the time domain start symbol is OFDM symbol #1 and the time domain offset value is 3, the time domain resource corresponding to the reference signal resource is OFDM # 4.

In this embodiment of the present application, the reference signal resource configuration information may also be used to configure a time domain behavior reported by CSI.

If the time domain behavior reported by the CSI is periodic or semi-persistent, for the case one, the number of reference signal resource sets configured by the reference signal resource configuration information is equal to n, that is, the number of reference signal resource sets configured by the reference signal resource configuration information is equal to the number of time units for which the terminal needs to perform reference signal measurement. In this way, for each of the n sets of reference signal resources, the terminal may select one or more reference signal resources from the sets of reference signal resources for reference signal reception and measurement.

If the time domain behavior reported by the CSI is periodic or semi-persistent, for case two, the number of reference signal resource sets configured by the reference signal resource is equal to 1, and the number of reference signal resources included in the reference signal resource set is equal to n. In this way, the terminal can receive and measure the reference signals on the n reference signal resources included in the reference signal resource set.

If the time domain behavior reported by the CSI is aperiodic, for the case one, the number of reference signal resource sets configured by the reference signal resource is greater than or equal to n, that is, the number of reference signal resource sets configured by the reference signal resource configuration information is greater than or equal to the number of time units for which the terminal needs to perform reference signal measurement. Optionally, in this case, the network device may send trigger information to the terminal to indicate the identities of the n sets of reference signal resources for the CM. In this way, for each of the n sets of reference signal resources, the terminal may select one or more reference signal resources from the sets of reference signal resources for reference signal reception and measurement.

If the time domain behavior reported by the CSI is aperiodic, for case two, the number of reference signal resource sets configured by the reference signal resource is greater than or equal to 1, and the number of reference signal resources included in each reference signal resource set is greater than or equal to n. Optionally, in this case, the network device may send trigger information to the terminal to indicate an identification of the reference signal resource set for the CM. Thus, the terminal can select n reference signal resources from the reference signal resource set indicated by the trigger information for receiving and measuring the reference signal.

Optionally, the trigger information may also be used to indicate n reference signal resources for the CM. In this case, the terminal can perform reception and measurement of the reference signal with the n reference signal resources indicated by the trigger information.

It should be noted that the trigger information may also be used to indicate the identification of the reference signal resource set for IM.

The Trigger information may be a CSI Trigger State (CSI Trigger State) field, and the CSI Trigger State field may be carried in DCI.

Based on the technical solution shown in fig. 7, the network device configures reference signal resources of multiple time units for the terminal by sending reference signal resource configuration information to the terminal, so that the terminal can measure reference signals of multiple time units, thereby determining channel state information based on multiple time units.

The above-mentioned scheme provided by the embodiment of the present application is mainly introduced from the perspective of interaction between each network element. It will be understood that each network element, such as the network device and the terminal, for implementing the above-described functions, includes corresponding hardware structures and/or software modules for performing each function. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the network device and the terminal may be divided into the functional modules according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation. The following description will be given by taking the case of dividing each function module corresponding to each function:

fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application. As shown in fig. 8, the terminal includes a communication module 801 and a processing module 802. The communication module 801 is configured to support the terminal to perform step S102 in fig. 4, step S201 in fig. 6, step S301 in fig. 7, and/or other processes for the technical solutions described herein. The processing module 802 is configured to support the terminal to perform step S101 in fig. 4 and/or other processes of the technical solutions described herein. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

As an example, in conjunction with the terminal shown in fig. 2, the communication module 801 in fig. 8 may be implemented by the transceiver 103 in fig. 2, and the processing module 802 in fig. 8 may be implemented by the processor 101 in fig. 2, which is not limited in this embodiment.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions; the computer readable storage medium, when run on the terminal shown in fig. 2, causes the terminal to perform the methods shown in fig. 4, 6 and 7. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The embodiment of the present application further provides a chip, which includes a processing module and a communication interface, where the communication interface is configured to transmit a received code instruction to the processing module, where the code instruction may be from a memory inside the chip or from a memory outside the chip or other devices, and the processing module is configured to execute the code instruction to support a terminal to execute the method shown in fig. 4, 6, and 7. Wherein, the processing module is a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiving pin.

Embodiments of the present application also provide a computer program product containing computer instructions, which when run on the terminal shown in fig. 2, enables the terminal to perform the methods shown in fig. 4, fig. 6 and fig. 7.

The terminal, the computer storage medium, the chip and the computer program product provided in the embodiments of the present application are all configured to execute the method provided above, and therefore, the beneficial effects achieved by the terminal, the computer storage medium, the chip and the computer program product may refer to the beneficial effects corresponding to the method provided above, and are not described herein again.

Fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present application. As shown in fig. 9, the network device includes a communication module 901 and a processing module 902. The communication module is configured to support the network device to perform step S102 in fig. 4, step S201 in fig. 6, step S301 in fig. 7, and/or other processes for the solution described herein. The processing module 902 is used to support the network device to perform step S104 in fig. 4, and/or other processes for the solutions described herein. All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.

As an example, in conjunction with the network device shown in fig. 2, the communication module 901 in fig. 9 may be implemented by the transceiver 203 in fig. 2, and the processing module 902 in fig. 9 may be implemented by the processor 201 in fig. 2, which is not limited in this embodiment.

The embodiment of the application also provides a computer readable storage medium, wherein the computer readable storage medium stores computer instructions; the computer readable storage medium, when run on the network device shown in fig. 2, causes the network device to perform the methods shown in fig. 4, 6, and 7. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, digital subscriber line) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium, or a semiconductor medium (e.g., solid state disk), among others.

The embodiment of the present application further provides a chip, which includes a processing module and a communication interface, where the communication interface is configured to transmit a received code instruction to the processing module, where the code instruction may be from a memory inside the chip or from a memory outside the chip or other devices, and the processing module is configured to execute the code instruction to support a network device to perform the method shown in fig. 4, fig. 6, and fig. 7. Wherein, the processing module is a processor or a microprocessor or an integrated circuit integrated on the chip. The communication interface may be an input-output circuit or a transceiving pin.

Embodiments of the present application also provide a computer program product containing computer instructions, which when run on the network device shown in fig. 2, enables the network device to perform the methods shown in fig. 4, fig. 6 and fig. 7.

The network device, the computer storage medium, the chip and the computer program product provided in the embodiments of the present application are all configured to execute the method provided above, and therefore, the beneficial effects achieved by the method can refer to the beneficial effects corresponding to the method provided above, and are not described herein again.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. An information feedback method, characterized in that the method comprises:

generating first indication information, wherein the first indication information is used for indicating M time-frequency null units and weighting coefficients of the M time-frequency null units; a time-frequency space unit is determined according to a time-domain base vector, a frequency-domain base vector and a space-domain base vector, wherein M is a positive integer; the time domain base vector is used for representing the change rule of a channel in the time domain;

and sending the first indication information.

2. The information feedback method according to claim 1,

the first indication information is used for indicating indexes of M time-frequency space units in a time-frequency space unit set; alternatively, the first and second electrodes may be,

the first indication information is used for indicating indexes of the M time-frequency space units in the time-frequency space unit subset.

3. The information feedback method according to claim 1,

the first indication information is used for indicating L space domain basis vectors, K time domain basis vectors and N frequency domain basis vectors; alternatively, the first and second electrodes may be,

the first indication information is used for indicating L space base vectors and X₁A time-frequency unit; a time-frequency unit is determined by a time-domain basis vector and a frequency-domain basis vector; alternatively, the first and second electrodes may be,

the first indication information is used for indicating K time domain basis vectors and X₂A plurality of space-frequency units; a space-frequency unit is determined by a space-domain basis vector and a frequency-domain basis vector; alternatively, the first and second electrodes may be,

the first indication information is used for indicating N frequency domain basis vectors and X₃A spatio-temporal unit; a space-time unit is determined by a time-domain basis vector and a space-domain basis vector;

wherein, L, K, N, X₁、X₂And X₃Are all positive integers.

4. The information feedback method according to any one of claims 1 to 3, further comprising, before generating the indication information:

receiving second indication information, wherein the second indication information is used for configuring a preset channel state information feedback mode;

if the terminal adopts a preset channel state information feedback mode, detecting reference signals of n time units, and determining channel state information, wherein the channel state information comprises the first indication information, and n is an integer greater than 1.

5. The information feedback method of claim 4, wherein the second indication information is carried in codebook indication information, and the codebook indication information is used for indicating a type of a codebook used by a terminal.

6. The information feedback method according to claim 4 or 5, wherein the second indication information is further used for indicating a value of the n.

7. The information feedback method according to any one of claims 1 to 6, wherein the method further comprises:

receiving reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, where the reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources correspond to different time units.

8. The information feedback method according to any one of claims 1 to 6, wherein the method further comprises:

receiving reference signal resource configuration information, where the reference signal resource configuration information is used to configure multiple reference signal resource sets, and the multiple reference signal resource sets correspond to different time units.

9. An information feedback method, characterized in that the method comprises:

receiving first indication information, wherein the first indication information is used for indicating M time-frequency null units and weighting coefficients of the M time-frequency null units; a time-frequency space unit is determined according to a time-domain base vector, a frequency-domain base vector and a space-domain base vector, wherein M is a positive integer; the time domain base vector is used for representing the change rule of a channel in the time domain;

and determining the M time-frequency space units and the weighting coefficients of the M time-frequency space units according to the first indication information.

10. The information feedback method according to claim 9,

the first indication information is used for indicating indexes of M time-frequency null units in subsets of a time-frequency null unit set.

11. The information feedback method according to claim 9,

wherein, L, K, N, X₁、X₂And X₃Are all positive integers.

12. The information feedback method according to any one of claims 9 to 11, wherein the method further comprises:

sending second indication information, wherein the second indication information is used for configuring a preset channel state information feedback mode; the preset channel state information feedback mode is used for indicating the terminal to detect reference signals of n time units and determining channel state information; the channel state information includes the first indication information, and n is an integer greater than 1.

13. The information feedback method of claim 12, wherein the second indication information is carried in codebook indication information, and the codebook indication information is used for indicating a type of a codebook used by a terminal.

14. The information feedback method according to claim 12 or 13, wherein the second indication information is further used for indicating a value of the n.

15. The information feedback method according to any one of claims 9 to 14, wherein the method further comprises:

sending reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, where the reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources correspond to different time units.

16. The information feedback method according to any one of claims 9 to 14, wherein the method further comprises:

and sending reference signal resource configuration information, wherein the reference signal resource configuration information is used for configuring a plurality of reference signal resource sets, and the reference signal resource sets correspond to different time units.

17. A terminal, comprising:

the processing module is used for generating first indication information, wherein the first indication information is used for indicating M time-frequency space units and weighting coefficients of the M time-frequency space units; a time-frequency space unit is determined according to a time-domain base vector, a frequency-domain base vector and a space-domain base vector, wherein M is a positive integer; the time domain base vector is used for representing the change rule of a channel in the time domain;

and the communication module is used for sending the first indication information.

18. The terminal of claim 17,

19. The terminal of claim 17,

wherein, L, K, N, X₁、X₂And X₃Are all positive integers.

20. The terminal according to any of the claims 17 to 19,

the communication module is further configured to receive second indication information, where the second indication information is used to configure a preset channel state information feedback mode;

the processing module is further configured to detect reference signals of n time units and determine channel state information if a preset channel state information feedback mode is adopted, where the channel state information includes the first indication information, and n is an integer greater than 1.

21. The terminal of claim 20, wherein the second indication information is carried in codebook indication information, and the codebook indication information is used for indicating a type of a codebook used by the terminal.

22. The terminal according to claim 20 or 21, wherein the second indication information is further used for indicating a value of the n.

23. The terminal according to any of the claims 17 to 22,

the communication module is further configured to receive reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, where the reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources correspond to different time units.

24. The terminal according to any of the claims 17 to 22,

the communication module is further configured to receive reference signal resource configuration information, where the reference signal resource configuration information is used to configure multiple reference signal resource sets, and the multiple reference signal resource sets correspond to different time units.

25. A network device, comprising:

the communication module is used for receiving first indication information, wherein the first indication information is used for indicating M time-frequency space units and weighting coefficients of the M time-frequency space units; a time-frequency space unit is determined according to a time-domain base vector, a frequency-domain base vector and a space-domain base vector, wherein M is a positive integer; the time domain base vector is used for representing the change rule of a channel in the time domain;

and the processing module is used for determining the M time-frequency space units and the weighting coefficients of the M time-frequency space units according to the first indication information.

26. The network device of claim 25,

27. The network device of claim 25,

wherein, L, K, N, X₁、X₂And X₃Are all positive integers.

28. The network device of any one of claims 25 to 27,

the communication module is further configured to send second indication information, where the second indication information is used to configure a preset channel state information feedback mode; the preset channel state information feedback mode is used for indicating the terminal to detect reference signals of n time units and determining channel state information; the channel state information includes the first indication information, and n is an integer greater than 1.

29. The network device of claim 28, wherein the second indication information is carried in codebook indication information, and the codebook indication information is used for indicating a type of a codebook used by a terminal.

30. The network device according to claim 28 or 29, wherein the second indication information is further used to indicate a value of the n.

31. The network device of any one of claims 25 to 30,

the communication module is further configured to send reference signal resource configuration information, where the reference signal resource configuration information is used to configure a reference signal resource set, where the reference signal resource set includes multiple reference signal resources, and the multiple reference signal resources correspond to different time units.

32. The network device of any one of claims 25 to 30,

the communication module is further configured to send reference signal resource configuration information, where the reference signal resource configuration information is used to configure multiple reference signal resource sets, and the multiple reference signal resource sets correspond to different time units.

33. A computer readable storage medium having stored therein instructions which, when run on a communication apparatus, cause the communication apparatus to perform the method of any of claims 1 to 8, or cause the communication apparatus to perform the method of any of claims 9 to 16.