WO2023160442A1

WO2023160442A1 - Csi reporting method, channel prediction method, terminal and network-side device

Info

Publication number: WO2023160442A1
Application number: PCT/CN2023/076146
Authority: WO
Inventors: 任千尧; 袁江伟; 刘昊
Original assignee: 维沃移动通信有限公司
Priority date: 2022-02-22
Filing date: 2023-02-15
Publication date: 2023-08-31
Also published as: CN116684916A

Abstract

The present application belongs to the technical field of communications. Disclosed are a channel state information (CSI) reporting method, a channel prediction method, a terminal and a network-side device. The CSI reporting method in the embodiments of the present application comprises: a terminal selecting at least two orthogonal-basis vector groups according to at least two symbols of CSI-RS transmitted on a target downlink channel, wherein each of the orthogonal-basis vector groups comprises one Doppler-domain orthogonal-basis vector, or each of the orthogonal-basis vector groups comprises one Doppler-domain orthogonal-basis vector and further comprises at least one of the following: one spatial-domain orthogonal-basis vector and one frequency-domain orthogonal-basis vector; and the terminal sending a CSI report to a network-side device, wherein the CSI report comprises first indication information and second indication information; and the first indication information comprises identification information of each orthogonal-basis vector in the at least two orthogonal-basis vector groups, and the second indication information comprises at least one of the following: a coefficient of each orthogonal-basis vector in the at least two orthogonal-basis vector groups and a combination coefficient of at least two orthogonal-basis vectors.

Description

CSI reporting method, channel prediction method, terminal and network side equipment

Cross References to Related Applications

This application claims priority to Chinese Patent Application No. 202210161995.4 filed in China on February 22, 2022, the entire contents of which are hereby incorporated by reference.

technical field

The present application belongs to the field of communication technology, and specifically relates to a channel state information (Channel State Information, CSI) reporting method, a channel prediction method, a terminal and a network side device.

Background technique

In related technologies, the state of the channel will change with time, and the conventional CSI feedback cannot keep up with the change of the channel, for example: between two adjacent CSI feedbacks, at this time, the network side device does not obtain new CSI feedback , the channel state can only be estimated according to the previous CSI feedback. However, when the channel has changed between two adjacent CSI feedbacks, if the network side device continues to estimate the channel state according to the previous CSI feedback, it will cause The channel estimation result does not match the actual state of the channel, thereby degrading communication performance.

Contents of the invention

The embodiment of the present application provides a CSI reporting method, a channel prediction method, a terminal, and a network-side device, so that the terminal can report a codebook of Doppler information reflecting channel changes over time, so that the network-side device can Changes in the channel to predict the channel state in a subsequent period of time, thereby improving communication performance.

In the first aspect, a method for reporting CSI is provided, and the method includes:

The terminal selects at least two sets of orthogonal basis vectors according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each set of orthogonal basis vectors includes a Doppler domain orthogonal basis vectors, or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector, so The at least two symbols correspond to N ₄ time-domain sampling points, and N ₄ is an integer greater than 1;

The terminal sends a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes each orthogonal basis vector in the at least two orthogonal basis vector groups The identification information of the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination of at least two orthogonal basis vectors coefficient.

In the second aspect, a CSI reporting device is provided, which is applied to a terminal, and the device includes:

The selection module is configured to select at least two sets of orthogonal basis vectors according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each set of orthogonal basis vectors includes 1 Doppler Orthogonal basis vectors in Le domain, or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector A base vector, the at least two symbols correspond to N ₄ time-domain sampling points, and N ₄ is an integer greater than 1;

A first sending module, configured to send a CSI report to a network side device, where the CSI report includes first indication information and second indication information, and the first indication information includes each of the at least two orthogonal basis vector groups Orthogonal basis vector identification information, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors .

In a third aspect, a channel prediction method is provided, the method comprising:

The network side device sends a channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N ₄ sampling points in the time domain, and N ₄ is an integer greater than 1;

The network-side device receives a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each orthogonal basis in at least two orthogonal basis vector groups Vector identification information, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors, the Each of the at least two sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector And also include at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector;

The network side device predicts the channel state information of the target downlink channel according to the CSI report.

In a fourth aspect, a channel prediction device is provided, which is applied to a network side device, and the device includes:

The second sending module is configured to send the channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N ₄ time domain sampling points, and N ₄ is greater than 1 integer;

The first receiving module is configured to receive a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each of at least two orthogonal basis vector groups The identification information of the orthogonal basis vector, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors, Each of the at least two sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes a Doppler-domain orthogonal The orthogonal basis vectors also include at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector;

A channel prediction module, configured to predict channel state information of the target downlink channel according to the CSI report.

In a fifth aspect, a terminal is provided, the terminal includes a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, the following The steps of the method in one aspect.

In a sixth aspect, a terminal is provided, including a processor and a communication interface, wherein the processor is configured to select at least two positive Orthogonal basis vector groups, each of which includes 1 Doppler domain orthogonal basis vector, or each of the orthogonal basis vector groups includes 1 Doppler domain orthogonal basis vector and also includes At least one of the following: 1 space-domain orthogonal basis vector and 1 frequency-domain orthogonal basis vector, the at least two symbols correspond to N ₄ time-domain sampling points, N ₄ is an integer greater than 1, and the communication interface uses For sending a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes an identifier of each orthogonal basis vector in the at least two orthogonal basis vector groups Information, the second indication information includes at least one of the following: coefficients of each orthogonal basis vector in the at least two sets of orthogonal basis vectors and combination coefficients of at least two orthogonal basis vectors.

In a seventh aspect, a network-side device is provided, the network-side device includes a processor and a memory, the memory stores programs or instructions that can run on the processor, and the programs or instructions are executed by the processor When realizing the steps of the method as described in the third aspect.

In an eighth aspect, a network side device is provided, including a processor and a communication interface, wherein the communication interface is used to send a channel state information reference signal CSI-RS to a terminal through at least two symbols on a target downlink channel, so The at least two symbols correspond to N ₄ sampling points in the time domain, where N ₄ is an integer greater than 1, and receive a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information The indication information includes identification information of each orthogonal basis vector in at least two sets of orthogonal basis vectors, and the second indication information includes at least one of the following items: each of the at least two sets of orthogonal basis vectors is orthogonal The coefficients of the basis vectors and the combination coefficients of at least two orthogonal basis vectors, each of the at least two orthogonal basis vector groups includes 1 Doppler domain orthogonal basis vector, or each The set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector; the processor is configured to The CSI report is used to predict the channel state information of the target downlink channel.

A ninth aspect provides a wireless communication system, including: a terminal and a network-side device, the terminal can be used to perform the steps of the CSI reporting method described in the first aspect, and the network-side device can be used to perform the steps of the third The steps of the channel prediction method described in the aspect.

In a tenth aspect, a readable storage medium is provided, and a program or Instructions, when the program or instructions are executed by the processor, implement the steps of the method described in the first aspect, or implement the steps of the method described in the third aspect.

In an eleventh aspect, a chip is provided, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run a program or an instruction to implement the method described in the first aspect. method, or implement the method as described in the third aspect.

In a twelfth aspect, a computer program/program product is provided, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the The steps of the CSI reporting method, or the steps of realizing the channel prediction method as described in the third aspect.

In this embodiment of the present application, the terminal selects at least two orthogonal basis vector groups according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each of the orthogonal basis vector groups includes 1 Doppler domain orthogonal basis vectors, or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain Domain orthogonal basis vector, the at least two symbols correspond to N ₄ time domain sampling points, N ₄ is an integer greater than 1; the terminal sends a CSI report to the network side device, and the CSI report includes the first indication information and The second indication information, the first indication information includes identification information of each orthogonal base vector in the at least two orthogonal base vector groups, and the second indication information includes at least one of the following: the at least two The coefficient of each orthogonal basis vector in the set of orthogonal basis vectors and the combination coefficient of at least two orthogonal basis vectors. In this way, the terminal reports the codebook information of the CSI report reflecting the Doppler information of the channel over time, so that the network side device can predict the channel state in a subsequent period of time according to the channel over time, thereby improving communication performance. .

Description of drawings

FIG. 1 is a schematic structural diagram of a wireless communication system to which an embodiment of the present application can be applied;

FIG. 2 is a flow chart of a CSI reporting method provided by an embodiment of the present application;

FIG. 3 is a flow chart of a channel prediction method provided in an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a CSI reporting device provided in an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a channel prediction device provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a hardware structure of a terminal provided in an embodiment of the present application;

Fig. 8 is a schematic structural diagram of a network side device provided by an embodiment of the present application.

Detailed ways

The technical scheme in the embodiment of the application will be carried out below in conjunction with the accompanying drawings in the embodiment of the application Clearly described, it is obvious that the described embodiments are some of the embodiments of the present application, but not all of the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in this application belong to the protection scope of this application.

The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application are capable of operation in sequences other than those illustrated or described herein and that "first" and "second" distinguish objects. It is usually one category, and the number of objects is not limited. For example, there may be one or more first objects. In addition, "and/or" in the description and claims means at least one of the connected objects, and the character "/" generally means that the related objects are an "or" relationship.

It is worth pointing out that the technology described in the embodiment of this application is not limited to the Long Term Evolution (Long Term Evolution, LTE)/LTE-Advanced (LTE-Advanced, LTE-A) system, and can also be used in other wireless communication systems, such as code Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access, OFDMA), Single-carrier Frequency Division Multiple Access (Single-carrier Frequency Division Multiple Access, SC-FDMA) and other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the above-mentioned system and radio technology, and can also be used for other systems and radio technologies. The following description describes the New Radio (NR) system for illustrative purposes, and uses NR terminology in most of the following descriptions, but these techniques can also be applied to applications other than NR system applications, such as the 6th generation (6 ^th Generation, 6G) communication system.

Fig. 1 shows a block diagram of a wireless communication system to which the embodiment of the present application is applicable. The wireless communication system includes a terminal 11 and a network side device 12 . Wherein, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a palmtop computer, a netbook, a super mobile personal computer (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), augmented reality (augmented reality, AR) / virtual reality (virtual reality, VR) equipment, robot, wearable device (Wearable Device) , Vehicle User Equipment (VUE), Pedestrian User Equipment (PUE), smart home (home equipment with wireless communication functions, such as refrigerators, TVs, washing machines or furniture, etc.), game consoles, personal computers (personal computer, PC), teller machine or self-service machine and other terminal side devices, wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart feet bracelets, smart anklets, etc.), smart wristbands, smart clothing, etc. It should be noted that the embodiment of this application does not limit the terminal 11 specific types. The network side device 12 may include an access network device or a core network device, where the access network device 12 may also be called a radio access network device, a radio access network (Radio Access Network, RAN), a radio access network function, or Wireless access network unit. The access network device 12 may include a base station, a wireless local area network (Wireless Local Area Networks, WLAN) access point or a WiFi node, etc., and the base station may be called a node B, an evolved node B (eNB), an access point, or a base transceiver station (Base Transceiver Station, BTS), radio base station, radio transceiver, Basic Service Set (BSS), Extended Service Set (Extended Service Set, ESS), Home Node B, Home Evolved Node B, sending and receiving point (Transmitting Receiving Point, TRP) or some other appropriate term in the field, as long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiment of this application, only the NR system The base station in the example is introduced as an example, and the specific type of the base station is not limited.

In wireless communication technology, accurate CSI feedback is crucial to channel capacity. Especially for a multi-antenna system, the transmitting end can optimize the signal transmission according to the CSI so that it can better match the channel state. For example: Channel Quality Indicator (CQI) can be used to select an appropriate modulation and coding scheme (Modulation and Coding Scheme, MCS) to achieve link adaptation; Precoding Matrix Indicator (PMI) can be used To achieve eigen beamforming, so as to maximize the strength of the received signal, or to suppress interference (such as inter-cell interference, interference between multiple users, etc.). Therefore, since the multi-antenna technology (such as: Multi-Input Multi-Output, MIMO) was proposed, the acquisition of CSI has always been a research hotspot.

Usually, the network-side device sends CSI reference signals (CSI-Reference Signals, CSI-RS) on some time-frequency resources of a certain slot (slot), and the terminal performs channel estimation based on the CSI-RS, and calculates the channel on this slot Information, the PMI is fed back to the base station through the codebook, and the network-side device combines the channel information according to the codebook information fed back by the terminal, and before the terminal reports CSI next time, the network-side device uses this channel information to perform data precoding and multi-user scheduling .

In order to further reduce the CSI feedback overhead, the terminal can change the PMI reported by each subband to report the PMI according to the delay (delay domain, that is, the frequency domain). Since the channel in the delay domain is more concentrated, it can be approximated with less delay PMI The PMI of all subbands can be regarded as reporting after compressing the delay field information.

Similarly, in order to reduce overhead, the network side device can precode the CSI-RS in advance and send the coded CSI-RS to the terminal. The terminal sees the channel corresponding to the coded CSI-RS. The terminal only needs to Select several ports with higher strength from the ports indicated by the network side device, and report the coefficients corresponding to these ports.

In related technologies, the information used by the network side device for CSI-RS precoding is angle information and delay information, and the network side device can use the uplink sounding reference signal (Sounding Reference Signal, SRS) to obtain this information, or through the previously reported PMI. In addition to the angle information and delay information, the channel information at a certain moment is phase information, which is rapidly changing information. The network side equipment cannot obtain it through other methods and needs to be reported by the terminal. Therefore, the terminal only needs to report the phase information. Yes, thereby reducing the overhead and processing complexity of CSI feedback.

Under the R16 codebook structure of the communication protocol in the related art, the network-side device sends CSI-RS, and the terminal receives and selects 2L space-domain orthogonal basis vectors (abbreviated as space-domain orthogonal basis, which can also be called angle-domain orthogonal basis), select M _v frequency-domain orthogonal basis vectors (which can also be referred to as time-delay (delay) domain orthogonal basis or), and the terminal reports the selected orthogonal basis and corresponding coefficients, and the network side device can The channel is recovered according to the orthogonal base and the coefficient corresponding to the orthogonal base.

However, in scenarios where the channel change rate is fast such as high-speed mobile, the conventional CSI feedback can no longer keep up with the change of the channel. In the embodiment of this application, the CSI codebook is made compatible by making the terminal report the Doppler domain orthogonal basis vector. Doppler information that can reflect channel changes over time, so that the network-side device can predict the channel state in a subsequent period of time based on the Doppler-domain orthogonal basis vector, so that the network-side device can then use the information reported by the terminal The channel recovered by the orthogonal base and the coefficient corresponding to the orthogonal base matches the actual channel state of the channel more closely.

The CSI reporting method, channel prediction method, CSI reporting device, channel prediction device, terminal and network side equipment provided in the embodiments of the present application are described in detail below through some embodiments and application scenarios with reference to the accompanying drawings.

Please refer to Figure 2. The CSI reporting method provided by the embodiment of the present application may be executed by a terminal, which may be the type of terminal listed in the embodiment shown in Figure 1, or may also include other types of The terminal is not specifically limited here. As shown in Figure 2, the CSI reporting method may include the following steps:

Step 201, the terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, and each of the orthogonal basis vector groups includes one Doppler domain orthogonal basis vector , or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector, the at least The two symbols correspond to N ₄ sampling points in the time domain, where N ₄ is an integer greater than 1.

In an implementation, the foregoing CSI-RS may be a precoded CSI-RS sent by a network side device. The aforementioned sampling points in the time domain may be sampling points for detecting orthogonal basis vectors. The at least two symbols corresponding to N ₄ time-domain sampling points can be expressed as: taking N ₄ time-domain sampling points on the time-domain resources of at least two symbols, each time-domain sampling point estimates a group of channel matrices, and each A set of channel matrices specifically refers to a channel matrix of _N3 frequency domain sampling points corresponding to the time domain sampling point or a channel matrix of multiple subbands in the frequency domain corresponding to the time domain sampling point. In this way, the terminal can select the orthogonal basis vectors in the air domain, frequency domain, and Doppler domain from the N ₄ sets of channel matrices.

It is worth pointing out that, in related technologies, the network side device only uses certain time-frequency resources of a slot The CSI-RS is sent on the network, and the terminal only selects K ₁ space-domain orthogonal bases and M frequency-domain orthogonal bases for the received CSI-RS of 1 symbol, that is, the terminal determines K ₁ ×M space-frequency domain orthogonal bases Base pair, it can be seen that the codebook determined by the terminal cannot carry Doppler domain information. However, in this embodiment of the present application, the terminal selects at least two sets of orthogonal basis vectors for the received CSI-RS of at least two symbols, and each set of orthogonal basis vectors includes one Doppler domain orthogonal basis vector, or Each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector, so that the terminal can be based on The channel estimation of the CSI-RS of at least two symbols obtains the Doppler domain information reflecting the change of the target downlink channel with time, and jointly determines the PMI sequence number according to the Doppler domain information, the air domain information and the frequency domain information, That is, the codebook in the embodiment of the present application takes Doppler domain information into consideration.

Step 202, the terminal sends a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes each of the at least two orthogonal basis vector groups The identification information of the orthogonal basis vectors, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two sets of orthogonal basis vectors and the combination coefficient of the at least two orthogonal basis vectors.

In a possible implementation manner, if each set of orthogonal basis vectors includes a Doppler domain orthogonal basis vector, the second indication information may include coefficients of the Doppler domain orthogonal basis vector , in applications, the coefficients of the Doppler domain orthogonal basis vector can indicate the time-varying characteristics of the target downlink channel.

In another possible implementation manner, if each set of orthogonal basis vectors includes one Doppler domain orthogonal basis vector, and also includes one spatial domain orthogonal basis vector and one frequency domain orthogonal basis vector At least one item, the second indication information may include the coefficient of each orthogonal basis vector and/or the combination coefficient of at least two orthogonal basis vectors, wherein the combination coefficient may be that at least two orthogonal basis vectors correspond to The coefficients of the orthogonal basis vector pairs for .

Taking an orthogonal basis vector group including 1 Doppler domain orthogonal basis vector, 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector as an example, the second indication information may include any of the following:

1) The coefficients of each Doppler domain orthogonal basis vector, the coefficients of each space domain orthogonal basis vector and the coefficients of each frequency domain orthogonal basis vector;

2) The coefficients of each Doppler domain orthogonal basis vector, and the coefficients of the space domain-frequency domain orthogonal basis vector pair;

3) The coefficients of the orthogonal basis vectors in the space-frequency-Doppler domain.

Of course, the second indication information may also include the coefficients of each spatial domain orthogonal basis vector, the coefficients of the Doppler domain-frequency domain orthogonal basis vector pair, etc., that is, each orthogonal basis vector group includes an independent orthogonal basis vector, the other two orthogonal basis vectors form an orthogonal basis vector pair, so that the second indication information includes the coefficients of each independent orthogonal basis vector and the coefficient of each orthogonal basis vector pair, which are not exhaustive here .

Wherein, the coefficients of the space-domain orthogonal basis vector and the coefficients of the frequency-domain orthogonal basis vector are used to indicate the space domain and frequency domain information of the target downlink channel, so that the coefficients in the second indication information can be used to indicate the target downlink channel over time The characteristics of the change, or the time-varying characteristics of the target downlink channel and the air domain and/or frequency domain information of the target downlink channel will not be described in detail here.

In an implementation, the CSI report reported by the above-mentioned terminal includes PMI, and the above-mentioned first indication information and second indication information may be information in the PMI (for example: the first indication information is used to indicate the identification information of the orthogonal basis vector, which may be The orthogonal basis vector is identified by the position of each orthogonal basis vector carried in the PMI), and based on the PMI, the terminal and the network side device can determine a precoding matrix in the codebook. In this way, based on the PMI, it can indicate the Doppler domain orthogonal basis vector and the coefficient of each Doppler domain orthogonal basis vector, and the network side device can predict the channel state of the target downlink channel in the next period of time according to the PMI, In this way, while reducing the overhead of the terminal and the network-side device based on precoding, the codebook can also be compatible with the Doppler domain information, so that the network-side device can receive the CSI report based on the information in this CSI report. PMI is used to predict the channel state of the target downlink channel in the next period of time, and select an appropriate modulation and coding scheme according to the predicted channel state, or to maximize the strength of the received signal, or to suppress interference, etc. In scenarios where time changes, communication performance is improved.

As an optional implementation manner, the terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, including:

The terminal selects K ₁ space-domain orthogonal basis vectors and M frequency-domain orthogonal basis vectors according to the CSI-RS of at least two symbols transmitted on the target downlink channel to obtain K ₁ ×M space-frequency domain orthogonal pair of basis vectors;

The terminal selects M ₁ Doppler domain orthogonal basis vectors for each of the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs, and obtains K ₁ ×M×M ₁ orthogonal basis vectors vector group;

Wherein, the K ₁ is the number of space domain orthogonal vector bases indicated by the network side equipment, the M is the number of frequency domain orthogonal vector bases indicated by the network side equipment, and the M ₁ is the Doppler frequency domain indicated by the network side equipment. The number of Le field orthogonal vector bases, K ₁ , M and M ₁ are respectively positive integers.

In implementation, the above terminal selects K ₁ space-domain orthogonal basis vectors and M frequency-domain orthogonal basis vectors according to the CSI-RS of at least two symbols transmitted on the target downlink channel to obtain K ₁ ×M space-frequency The domain orthogonal basis vector pair can be under the communication protocol R16 codebook structure in the related art, the network side device sends the CSI-RS, and the terminal receives and selects 2L space domain orthogonal basis vectors (abbreviated as space domain orthogonal basis) , the process of selecting M _v delay-field orthogonal bases is similar, and will not be repeated here. The differences between the embodiments of the present application and related technologies include:

1) One time-domain sampling point of the CSI report (that is, the granularity of the CSI measurement in the time domain) corresponds to one symbol, one part of a symbol (that is, one symbol is sampled at least twice, for example: every half symbol is sampled once) , at least two symbols or time domain bits of at least one CSI-RS resource (resource) place. Wherein, if a time-domain sampling point corresponds to at least two symbols, it is considered that within the at least two symbols, the channel will not change (that is, when the interval between at least two symbols is short and the channel state changes little, The at least two symbols can be regarded as one time instant to calculate CSI). And the N ₄ time-domain sampling points correspond to at least two symbols. For ease of description, in the following embodiments, one time-domain sampling point corresponds to one symbol as an example for illustration, that is, it is assumed that N ₄ time-domain sampling points correspond to N ₄ symbols.

2) For each space domain-frequency domain orthogonal basis vector pair, _M1 Doppler domain orthogonal basis vectors are also selected correspondingly.

Wherein, the values of K ₁ , M and M ₁ may be stipulated in the protocol, or determined according to an instruction of the network side device, and are not specifically limited here.

Of course, the above K ₁ ×M space domain-frequency domain orthogonal basis vector pairs may be indicated by the network side device, or selected by the terminal within the range indicated by the network side device, which is not specifically limited here.

In this embodiment, K ₁ ×M space domain-frequency domain orthogonal basis vector pairs are selected first, and then M ₁ Doppler domain orthogonal basis vectors are selected for each space domain-frequency domain orthogonal basis vector pair, which can simplify The process of selecting K ₁ ×M×M ₁ orthogonal basis vector groups.

In an optional implementation manner, the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs are jointly selected according to the N ₄ time domain sampling points.

Wherein, the above-mentioned N ₄ time-domain sampling points correspond to at least two symbols, at this time, the joint selection of the N ₄ time-domain sampling points may be adding the second-order matrix of the N ₄ time-domain sampling points, and according to The result after the addition selects K ₁ ×M pairs of orthogonal basis vectors in the space domain-frequency domain. In this way, N ₄ sampling points in the time domain can jointly select K ₁ ×M orthogonal basis vector pairs in the space domain and frequency domain.

In another optional implementation manner, the K ₁ ×M space-frequency domain orthogonal basis vector pairs are the space-frequency domain orthogonal basis vector pairs corresponding to each of the N ₄ time-domain sampling points The preset airspace-frequency domain orthogonal basis vector pair, the preset airspace-frequency domain orthogonal basis vector pair includes:

K ₁ ×M space-frequency domain orthogonal basis vector pairs corresponding to the preset time-domain sampling points among the N ₄ time-domain sampling points;

K ₁ ×M pairs of space-frequency domain orthogonal basis vectors with larger power values of the equivalent channel selected from the space-frequency domain orthogonal basis vector pairs corresponding to the N ₄ time-domain sampling points.

In an implementation, the aforementioned preset time domain sampling point may be a time domain sampling point whose time domain position is at the first position among the N ₄ time domain sampling points or a time domain sampling point arranged at other preset time domain positions . In this way, the terminal only needs to measure the K ₁ ×M space-frequency domain orthogonal basis vectors corresponding to the time-domain sampling point, thereby reducing the calculation amount of the terminal.

In addition, after selecting K ₁ ×M pairs of space-frequency domain orthogonal basis vectors, M ₁ same Doppler-domain orthogonal basis vectors can be selected for each space-frequency domain orthogonal basis vector pair, Or select M ₁ different Doppler domain orthogonal basis vectors for each space domain-frequency domain orthogonal basis vector pair respectively, in This is not specifically limited.

After the terminal selects K ₁ ×M×M ₁ orthogonal basis vector groups, the terminal can report all the selected orthogonal basis vectors and the coefficients of each orthogonal basis vector, that is, report K ₁ ×M×M ₁ Orthogonal basis vector group and K ₁ ×M×M ₁ coefficients; or, the terminal can only report the non-zero coefficients (that is, the coefficients whose amplitude value is not equal to 0) among the K ₁ ×M×M ₁ coefficients, and the Orthogonal basis vectors corresponding to non-zero coefficients; or, the terminal may choose to report part of the orthogonal basis vectors and their coefficients among the K ₁ ×M×M ₁ coefficients.

For example: the terminal determines that the at least two orthogonal basis vector groups include γ×K ₁ ×M×M ₁ orthogonal basis vector groups corresponding to γ×K ₁ ×M×M ₁ coefficients, and the γ× K ₁ ×M×M ₁ coefficients are larger γ×K ₁ ×M×M ₁ coefficients among the non-zero coefficients, and the γ is any constant between 0 and 1; or,

The terminal determines that the at least two orthogonal basis vector sets include β×K ₁ ×M×γ×M ₁ orthogonal basis vector sets corresponding to β×K ₁ ×M×γ×M ₁ coefficients, the The β×K ₁ ×M×γ×M ₁ coefficients are the larger β×K ₁ ×M×γ×M ₁ coefficients among the non-zero coefficients, and the β is any constant between 0 and 1; or ,

The terminal determines that the at least two orthogonal basis vector sets include β×K ₁ ×M×M ₁ orthogonal basis vector sets corresponding to β×K ₁ ×M×M ₁ coefficients, and the β×K ₁ The ×M×M ₁ coefficients are the larger β×K ₁ ×M×M ₁ coefficients among the non-zero coefficients.

In practice, the above value of γ can be specified by the protocol or indicated by the network side device. For example, if the protocol stipulates that γ is equal to 0.5, after the terminal selects 24 orthogonal basis vector groups, it can only report the 24 Among the 24 coefficients corresponding to the orthogonal basis vector set, 0.5×24=12 coefficients that are not equal to zero and have larger values, and the 12 orthogonal basis vector sets corresponding to the 12 coefficients.

In addition, the above β may be a proportional value associated with the coefficients of the airspace-frequency domain orthogonal basis vector pair agreed in the agreement, for example: assuming that the agreement stipulates that β is equal to 0.5, then 12 airspace-frequency domain orthogonal basis vectors are selected at the terminal After pairing, you can only report 0.5×12=6 coefficients among the 12 coefficients corresponding to the 12 airspace-frequency domain orthogonal basis vector pairs that are not equal to zero and have a larger value, and the 6 airspace coefficients corresponding to the 6 coefficients - Pairs of frequency-domain orthonormal basis vectors.

Method 1: The above-mentioned terminal reports γ×K ₁ ×M×M ₁ coefficients can be: the terminal reports γ×M ₁ Doppler domain coefficients for each of the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs Nonzero coefficients of the orthogonal basis vectors. Or, after selecting K ₁ ×M×M ₁ orthogonal basis vector groups, further select larger γ×K ₁ ×M×M ₁ non-zero coefficients from K ₁ ×M×M ₁ coefficients, where , the value of γ can be predefined by the protocol or indicated by the network side device.

Method 2: The above-mentioned terminal reports β×K ₁ ×M×γ×M ₁ coefficient can be: the terminal reports the larger β×K ₁ ×M among the K ₁ ×M space-frequency domain orthogonal basis vector pairs non-zero coefficients (that is, K ₁ ×M coefficients of K ₁ ×M spatial-frequency domain orthogonal basis vector pairs include β×K ₁ ×M non-zero coefficients), and the β×K ₁ ×M spatial domain - Each of the frequency-domain orthogonal basis vector pairs reports γ×M ₁ more The coefficients of the orthogonal basis vectors in the Doppler domain, the coefficients of the γ×M ₁ Doppler domain orthogonal basis vectors are the larger values of γ×M ₁ among the coefficients of the M ₁ Doppler domain orthogonal basis vectors a non-zero coefficient.

_That is to say, in this mode, the terminal first selects K ₁ ×M space-frequency domain orthogonal basis vector pairs, and then selects β× K ₁ ×M non-zero coefficients with large values, and for each of the β×K ₁ ×M spatial-frequency domain orthogonal basis vector pairs corresponding to the β×K ₁ ×M coefficients, select M ₁ Doppler-domain orthogonal basis vector, and finally, according to the coefficients of the M ₁ Doppler-domain orthogonal basis vectors, select γ×M ₁ non-zero coefficients with larger values, and finally get β×K ₁ × M × γ × M ₁ coefficient.

Optionally, the set of β×K ₁ ×M×γ×M ₁ orthogonal basis vectors includes coefficients selected from K ₁ ×M space-frequency domain orthogonal basis vector pairs that are not zero and whose magnitudes are smaller Large β×K ₁ ×M ones, and each of the β×K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponds to the coefficients of γ×M ₁ Doppler domain orthogonal basis vectors, Wherein, the γ×M ₁ Doppler-domain orthogonal basis vectors are γ×M ₁ of the M ₁ Doppler-domain orthogonal basis vectors with non-zero coefficients and relatively large amplitudes.

In this embodiment, the selection process of the coefficients of the β×K ₁ ×M space domain-frequency domain orthogonal basis vector pairs is separated from the selection process of the coefficients of the γ×M ₁ Doppler domain orthogonal basis vectors, so that According to the existing technology, select the larger space-frequency domain orthogonal basis vector pairs among the β×K ₁ ×M non-zero coefficients, and then select the corresponding γ× M ₁ Doppler domain orthogonal basis vectors with large coefficients.

Method 3: The above-mentioned terminal reporting β×K ₁ ×M×M ₁ coefficients can be: the terminal reports β×K ₁ × among the K ₁ ×M coefficients of K ₁ ×M space domain-frequency domain orthogonal basis vector pairs M non-zero coefficients, that is, the terminal selects M ₁ Doppler domain orthogonal basis vectors for each non-zero coefficient space-frequency domain orthogonal basis vector pair, and reports the M ₁ Doppler domain orthogonal basis vectors The coefficients of the basis vectors. Alternatively, after selecting K ₁ ×M×M ₁ orthogonal basis vector groups, further select larger β×K ₁ _× M×M ₁ non-zero coefficients from the K 1 ×M×M ₁ coefficients.

In this embodiment, the overhead of CSI reporting can be reduced by reporting the relatively large non-zero coefficients among the K ₁ ×M×M ₁ coefficients.

As an optional implementation manner, the CSI reporting method further includes:

The terminal determines a first window in the Doppler domain, and the CSI report further includes third indication information, where the third indication information is used to indicate at least one of a starting position and a window length of the first window , the Doppler domain orthogonal basis vectors in the at least two sets of orthogonal basis vectors are measured in the first window, and the window length of the first window is less than or equal to the N ₄ , or, the The window length of the first window is less than or equal to the product of N ₄ and the oversampling multiple in the Doppler domain.

In an implementation, the above-mentioned first window may be a Doppler window determined by the terminal, that is, the terminal determines a range of the Doppler domain, and measures and selects an orthogonal basis vector in the Doppler domain within the range of the Doppler domain. Or, in the case of oversampling in the Doppler domain, the first window range, and in the expanded first window, the Doppler domain orthogonal basis vectors are oversampled according to the Doppler domain oversampling multiple.

Wherein, the window length of the first window is less than or equal to the N ₄ , which can be understood as: the first window contains at most N ₄ sampling points in the time domain, thus corresponding to at most N ₄ Doppler domain orthogonal basis vectors. In the same way, the window length of the above-mentioned first window is less than or equal to the product of N ₄ and the oversampling multiple in the Doppler domain, which can be understood as: the first window contains at most 0 ₃ times the time-domain sampling points of N ₄ , thus corresponding to at most O ₃ times the Doppler domain orthogonal basis vectors of N ₄ , where O ₃ is the oversampling multiple in the Doppler domain.

In implementation, the above-mentioned first window may be indicated by its starting position and window length, wherein the length of the first window may be specified in the protocol or reported by the terminal through the above-mentioned third indication information, and the starting position of the first window may be The position can be reported by the terminal or defaults to 0.

From another point of view, the third indication information may only indicate one of them, or indicate two items, wherein, in the case where the third indication information only indicates one of them, the other item may be determined in a manner stipulated in the agreement For example, assuming that the initial position of the first window is 0 by default in the protocol, if the third indication information indicates that the window length of the first window is 5, then the Doppler domain corresponding to the first window ranges from 0 to 5.

In this embodiment, the terminal reports the range of the Doppler domain to the network side device, so that the network side device can perform channel recovery and channel prediction based on the Doppler domain orthogonal basis vectors within the range.

Optionally, each space domain-frequency domain orthogonal basis vector pair in the at least two sets of orthogonal basis vectors corresponds to the respective first window, or, in the at least two sets of orthogonal basis vectors All pairs of space domain-frequency domain orthogonal basis vectors correspond to the same first window.

In this embodiment, similar to the fact that the same or different Doppler domain orthogonal basis vectors can be selected for each space-frequency domain orthogonal basis vector pair, each space-frequency domain orthogonal basis vector pair can be in the same or different Respective Doppler domain orthogonal basis vectors are selected within the scope of different Doppler domains, which is not specifically limited here.

The terminal receives fourth indication information from the network side device, where the fourth indication information is used to indicate at least one of the starting position and the window length of the second window for measuring the Doppler domain orthogonal basis vector , and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is a Doppler domain window, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N ₄ , or the window length of the second window is less than or equal to the N ₄ and Doppler The product of domain oversampling multiples, the length of the third window is less than or equal to N ₃ , where N ₃ is the number of frequency domain sampling points indicated by the network side device;

According to the at least two symbols CSI-RS transmitted on the target downlink channel, the terminal includes:

The terminal selects the Doppler domain orthogonal basis vector of the CSI-RS within the second window;

and / or,

The terminal selects the CSI-RS within the third window and needs to calculate Doppler domain information Orthogonal basis vectors in the frequency domain;

and / or,

The terminal selects the frequency-domain orthogonal basis vector of the CSI-RS within the third window.

For the above-mentioned second window, its meaning is similar to that of the first window, except that the above-mentioned second window is indicated to the terminal by the network-side device, while the above-mentioned first window is reported by the terminal to the network-side device, In this way, when the network side device sends the fourth indication information to the terminal, the terminal can select the Doppler domain orthogonal basis vector within the range of the Doppler domain (ie, the second window) indicated by the network side device.

Further, after the network side device indicates the second window to the terminal, the terminal can also report the first window to the network side device, and the first window is included in the second window, at this time, the terminal can indicate to the network side device Doppler domain orthogonal basis vectors are selected within the partial Doppler domain range. For example: the second window indicated by the network side device is 0-8, if the terminal selects the Doppler domain orthogonal basis vector within the Doppler domain range: 0-5, the first window that the terminal can report can be 0-8 5.

For example: assuming that one symbol corresponds to one Doppler sampling point, then N ₄ symbols represent N ₄ × R ₂ Doppler sampling points, where R ₂ is the oversampling multiple, and the base station indicates a window (ie, the second window) , the starting position of the window is 0, the length is N _d , configured by the base station, N _d <N ₄ , the terminal will only measure and report the Doppler in the range of 0~N _d -1, this can help the terminal reduce the complexity.

Similarly, when the terminal reports the identity of the Doppler orthogonal basis vector, it can also report the starting position and window length of the window where the Doppler orthogonal basis vector is located by means of a window (that is, reporting the first window). And the specific position of the Doppler orthogonal basis vector in the window, for example: assuming N ₄ =8, N _d =6, the terminal is only reporting the Doppler orthogonal basis vector within the position index 0-5; or, Assuming that the window length of the first window is fixed to 2 by the base station configuration or agreement, and the starting position index of the first window reported by the terminal is 1, it means that the terminal reports the Doppler orthogonal basis vector corresponding to the position index 1 and 2; or , assuming that the window length of the first window is fixed at 4, and the terminal reports the starting position index of the first window as 1, which means that the first window contains position indexes: 1, 2, 3, 4, and the terminal selects the position index 1 and 4 corresponds to the Doppler domain orthogonal basis vector, the terminal can additionally report a combination number up to C(4,2) to indicate the location index 1 and 4 of the Doppler domain orthogonal basis vector; or, the terminal Report the starting position index of the first window as 1, and the window length of the first window as 1, indicating that there is only one Doppler domain orthogonal basis vector. Among them, the terminal specifically reports several Doppler domain orthogonal basis vectors, which can be determined according to the parameter M _1. When M ₁ =1, the terminal can only report a 3-bit number to represent a certain value in the position index 0-5 , which is the starting position of the first window.

In addition, the above-mentioned third window is the delay domain range indicated by the network side device, and the delay domain range can be converted into a corresponding frequency domain range, and the terminal can select a frequency domain orthogonal basis vector within the frequency domain range, and/or , the terminal can select an orthogonal basis vector in the frequency domain that needs to calculate Doppler domain information within the range of the frequency domain.

In this embodiment, the network device may indicate the Doppler domain range and/or the frequency domain range to the terminal, so that the terminal selects the Doppler domain orthogonal basis vector and /or frequency-domain orthogonal basis vectors, which can reduce the calculation amount of the terminal.

In implementation, the above-mentioned M ₊₁ Doppler domain orthogonal basis vectors can be oversampled, and the oversampling multiple can be indicated by the network side device or a range can be agreed upon through an agreement, wherein, if the oversampling multiple is indicated by the network side device, Then the oversampling multiple can be configured jointly with parameters such as M and K ₁ .

The terminal acquires a Doppler oversampling multiple O ₃ , and the Doppler oversampling multiple O ₃ includes O ₃ Doppler oversampling identifiers;

The terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, including:

The terminal selects M ₁ Doppler domain orthogonal basis vectors from N ₄ ×O ₃ candidate Doppler domain orthogonal basis vectors;

Wherein, the first indication information further includes Doppler oversampling identifiers corresponding to the M ₁ Doppler domain orthogonal basis vectors.

In implementation, each Doppler oversampling flag can correspond to a group of Doppler domain orthogonal basis vectors, and each group of Doppler domain orthogonal basis vectors can include N ₄ Doppler domain orthogonal basis vectors, For example: assuming O ₃ =4, four sets of Doppler domain orthogonal basis vectors are collected, and the four sets of Doppler domain orthogonal basis vectors correspond to Doppler oversampling flags 0-3 respectively.

In the implementation, when the terminal obtains the Doppler oversampling multiple O ₃ , there are N ₄ × O ₃ candidate Doppler domain orthogonal basis vectors in total, and the M ₁ Doppler domain orthogonal basis vectors selected by the terminal The basis vectors are included in the N ₄ ×O ₃ candidate Doppler domain orthogonal basis vectors.

In one embodiment, the network side device may indicate that some Doppler domain orthogonal basis vectors are not within the candidate range based on the above-mentioned ₀₃ Doppler oversampling identifiers and/or time domain sampling point identifiers, for example: assume O ₃ =4, then there are N ₄ ×O ₃ candidate Doppler domain orthogonal basis vectors in total. At this time, if the network side device instructs the terminal not to detect the second set of Doppler domain orthogonal basis vectors, Or instruct the terminal not to detect the Doppler domain orthogonal basis vectors of some of the time domain sampling points in the N ₄ time domain sampling points, then it can be excluded from the N ₄ × O ₃ candidate Doppler domain orthogonal basis vectors The non-detection partial Doppler domain orthogonal basis vector indicated by the network side device can reduce the calculation amount of the terminal.

In another embodiment, when the terminal reports the CSI, it may also indicate the Doppler oversampling flag corresponding to the Doppler domain orthogonal basis vector selected in the CSI, that is, tell the network side device that the terminal selects from O3 Which Doppler oversampling is identified, and/or, when reporting the CSI, the terminal may also indicate the time domain sampling point corresponding to the Doppler domain orthogonal basis vector selected in the CSI.

Further, the terminal may also indicate the Doppler domain range where the Doppler domain orthogonal basis vector corresponding to the above-mentioned Doppler oversampling identifier and/or time domain sampling point selected by the terminal is located by reporting the first window .

Similar to the fact that the same or different Doppler domain orthogonal basis vectors can be selected for each space domain-frequency domain orthogonal basis vector pair, each space domain-frequency domain orthogonal basis vector pair can correspond to the same or different Different Doppler oversampling identifiers, for example: the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs correspond to the same Doppler oversampling identifier, which is not specifically limited here.

Of course, in implementation, the terminal may also report all selected Doppler domain orthogonal basis vectors to the network side device, which is not specifically limited here.

As an optional implementation manner, the CSI report also includes a strongest coefficient indicator (Strongest Coefficient Indicator, SCI), the SCI is used to indicate the position of the coefficient with the largest amplitude value, and the position includes:

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.

In implementation, the coefficients of the space domain orthogonal basis vector, the frequency domain orthogonal basis vector and the Doppler domain orthogonal basis vector are all complex numbers, and the complex numbers have amplitude values (may be referred to simply as amplitude values) and phase values, wherein the amplitude The maximum value can be regarded as the maximum power of the equivalent channel. By reporting the position of the coefficient with the largest amplitude value, the number of coefficients reported by the terminal can be reduced. Compared with the number of bits occupied by the coefficient reported by the terminal, the SCI occupancy The number of bits is less, which can reduce the overhead of the terminal. For example: assume that the terminal needs to report a total of 12 coefficients. At this time, the terminal can report the position of a coefficient with the largest amplitude, and report the ratio (including amplitude and phase) of the other 11 coefficients to this coefficient. In this way, the base station can report the position of the largest coefficient The magnitude of the coefficient is regarded as 1, and the phase is regarded as 0. According to the ratio of the other 11 coefficients to this coefficient, the base station can obtain the relationship of 12 coefficients. In this way, each ratio reported by the terminal and the corresponding original coefficient have a fixed multiple relationship. so as not to affect the final result.

As an optional implementation manner, the CSI report further includes a bitmap of the coefficient;

The bitmap is the bit of the product of the coefficients of the K ₁ spatial domain orthogonal basis vectors, the coefficients of the M frequency domain orthogonal basis vectors, and the coefficients of the M ₁ Doppler domain orthogonal basis vectors Figure; or,

The bit map is a bit map of the number K ^NZ of the first parameter whose value is the first preset value, wherein, if the target first parameter is equal to the first preset value, the second indication information includes Coefficients of M ₁ Doppler domain orthogonal basis vectors corresponding to the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter; if the target first parameter is equal to the second preset value , the second indication information includes the preset number of M 1 Doppler domain orthogonal basis vectors corresponding to the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first _parameter Coefficients of the Puller domain orthogonal basis vectors; or,

The bitmap is a bitmap of the product of the K ^NZ and the coefficients of the M ₁ Doppler domain orthogonal basis vectors.

In an implementation, the coefficient bitmap is used to indicate the position of the coefficient of the orthogonal basis vector reported by the terminal.

In the related art, in the K ₁ ×M bitmap, 1 is used to indicate the non-zero coefficient, and the K ₁ ×M The bitmap of is composed of the coefficients of K ₁ space-domain orthogonal basis vectors and the coefficients of M frequency-domain orthogonal basis vectors.

The bitmap in the embodiment of this application can be any of the following:

1) K ₁ ×M×M ₁ bitmap, where 1 is used to indicate non-zero coefficients, the K ₁ ×M×M ₁ bitmap consists of K ₁ coefficients of spatial domain orthogonal basis vectors, M frequency domain The coefficients of the orthogonal basis vectors and the composition of the coefficients of M ₁ Doppler domain orthogonal basis vectors;

2) K _NZ bitmap, where K _NZ represents the number of 1s in the K ₁ ×M bitmap. Wherein, if the bit value in the bitmap is equal to 1, it means that the _M1 Doppler domain orthogonal basis vectors corresponding to the space domain-frequency domain orthogonal base pair corresponding to the bit value all report coefficients; If the bit value is equal to 0, it means that there is only one reporting coefficient in the M ₁ Doppler domain orthogonal base vectors corresponding to the space domain-frequency domain orthogonal base pair corresponding to the bit value (for example: M ₁ Doppler domain orthogonal base vectors The coefficient of the first Doppler-domain orthogonal basis vector in the intersection basis vector, that is, the preset Doppler-domain orthogonal basis vector can be the first Doppler among the M ₁ Doppler-domain orthogonal basis vectors Domain Orthogonal Basis Vectors);

3) A bitmap of K _NZ ×M ₁ , wherein non-zero coefficients are indicated by 1;

For the above bitmap 2) or 3), the bitmap in the CSI can be omitted in some cases, for example: in the case of meeting the preset condition, the CSI report does not include the bitmap, the preset condition Include at least one of the following:

said M ₁ is equal to 1;

The values of the bitmap are all equal to 1.

In this way, the bitmap may not be reported when it is not necessary, and the resource consumption of CSI reporting can be reduced.

In order to illustrate the CSI reporting method provided by the embodiment of the present application, the following embodiment is taken as an example to illustrate the CSI reporting method provided in the embodiment of the present application:

example one

Assume that the terminal receives the CSI-RS sent by the network side equipment in N ₄ symbols, where the number of CSI-RS ports received by each symbol is P, the number of subbands is N _CQI , and the PMI subband in each CQI subband The number is R, then there are N ₃ =N _CQI ×R PMI subbands in total, and the terminal has estimated the channels of P CSI-RS ports in each subband of each symbol. If the terminal has N _r antennas, then The channel received by the terminal is H _ij , i represents a symbol, and its value is any integer from 1 to N ₄ , j represents a subband, and its value is any integer from 1 to N ₃ , then H _ij is N _r *The complex matrix of P, based on which the terminal calculates and reports the PMI.

In the related technology, N ₄ =1, the terminal will use channels of all subbands to select 2×L (or K ₁ ) spatial domain orthogonal basis vectors and M _v (or M) frequency domain orthogonal basis vectors, where, L represents the number of beams. However, in the embodiment of the present application, for all channels of N ₄ symbols, common 2×L spatial domain orthogonal basis vectors and M _v frequency domain orthogonal basis vectors are selected.

For example: 2×L space-domain orthogonal basis vectors and M _v frequency-domain orthogonal basis vectors are selected by the following steps:

Step 1. Calculation formula:

Among them, Cov represents the covariance matrix, Indicates the conjugate transformation value, and H indicates the MIMO matrix.

Step 2. Select the strongest 2L column in Cov, or divide H _ij into two polarizations, select the strongest L column on each polarization, and then merge into 2L columns, the result on each polarization can be the same It can also be different.

Step 3. In each symbol, the N ₃ channels are transformed into the time delay domain through the discrete inverse Fourier transform (Inverse Discrete Fourier Transform, IDFT) of N ₃ points, and the N ₃ symbols are transformed at each time delay point The power is added, and M _v time delays with the highest power are selected.

Step 4. According to the selected 2L space-domain orthogonal basis W ₁ and the frequency-domain orthogonal basis W _f corresponding to M _v time delays, determine 2L×M _v space-frequency domain orthogonal basis pairs, and then calculate each The equivalent channel H _ie of the space-frequency domain orthogonal base pair, where e is the identity of the space-frequency domain orthogonal base pair, and its value is any integer from 1 to 2L×M _v , and H _ie is Nr× 2L matrix.

Step 5. For each space-frequency domain orthogonal base pair, perform N ₄ × R ₂ -point discrete Fourier transform (Discrete Fourier Transform, DFT) changes on the H _ie of all N ₄ symbols to obtain the Doppler domain channel, where R ₂ is the oversampling multiple of the Doppler domain, calculate the power value of each point, find the position with the highest power value, and report the oversampling index and Doppler offset corresponding to this position to the base station. Specifically, after N ₄ H _ie perform DFT of N ₄ ×R ₂ points, N ₄ ×R ₂ H _ike are obtained, i=1～N ₄ , k represents the oversampling flag, and the value of k is Any integer from 1 to R ₂ , i corresponding to the H _ike with the highest power is the Doppler offset value. Among them, each spatial-frequency domain orthogonal base pair has a Doppler offset value result.

Certainly, in an implementation, the value of k of all the space domain-frequency domain orthogonal base pairs may be the same, but the value of i may be different.

Please refer to Figure 3, a channel prediction method provided by the embodiment of the present application corresponds to the CSI reporting method shown in Figure 2, that is, the channel prediction method provided by the embodiment of the present application sends a CSI-RS to the network side device for execution The terminal of the CSI reporting method as shown in Figure 2 detects the CSI-RS, and reports the CSI reported to the network-side device performing the channel prediction method as shown in Figure 3 according to the detection result, so that the network-side device reports according to the CSI The Doppler domain information in the target channel is used to know the change of the target downlink channel over time, and then the channel state information of the target downlink channel can be predicted accordingly.

As shown in Figure 3, the channel prediction method may include the following steps:

Step 301, the network side device sends the CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N ₄ sampling points in the time domain, where N ₄ is an integer greater than 1.

The time-domain sampling points in this embodiment of the present application have the same meaning as the time-domain sampling points in the CSI reporting method shown in FIG. 2 , and details are not repeated here.

Step 302, the network side device receives a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each of at least two orthogonal basis vector groups The identification information of the orthogonal basis vectors, the second indication information includes at least one of the following items: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the coefficients of the at least two orthogonal basis vectors Combining coefficients, each of the at least two sets of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes 1 Doppler The domain orthogonal basis vectors also include at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector.

The first indication information, the second indication information, the orthogonal basis vector group, and the coefficients of each orthogonal basis vector in at least two orthogonal basis vector groups in the embodiment of the present application can refer to the CSI report shown in Figure 2 The explanation in the method will not be repeated here.

Step 303, the network side device predicts the channel state information of the target downlink channel according to the CSI report.

In this embodiment, the network side device predicts the channel state information of the target downlink channel according to the CSI report, which may be based on the space domain orthogonal basis vector and its coefficient, frequency domain normal The orthogonal basis vector and its coefficients and the Doppler domain orthogonal basis vector and its coefficients are used to restore the target downlink channel, and the recovered target downlink channel is restored based on the Doppler domain orthogonal basis vector and its coefficients, so as to reflect the target The time-varying characteristics of the downlink channel, the network-side device can predict the channel state information of the target downlink channel at a subsequent time according to the time-varying characteristics of the target downlink channel.

Optionally, the at least two orthogonal basis vector groups are K ₁ ×M×M ₁ orthogonal basis vector groups, and the K ₁ ×M×M ₁ orthogonal basis vector groups include K ₁ ×M Space-frequency domain orthogonal basis vector pairs and M ₁ Doppler domain orthogonal basis vectors corresponding to the K ₁ ×M space-frequency domain orthogonal basis vector pairs;

The K ₁ is the number of airspace orthogonal vector bases indicated by the network side device, and the M is the network side The number of frequency domain orthogonal vector bases indicated by the device, the M ₁ is the number of Doppler domain orthogonal vector bases indicated by the network side device, and K ₁ , M and M ₁ are positive integers respectively.

Optionally, the K ₁ ×M space-frequency domain orthogonal basis vector pairs are jointly selected according to the N ₄ time-domain sampling points; or,

The K ₁ ×M pairs of space-frequency domain orthogonal basis vectors are preset space-frequency domain orthogonal basis vectors in the space-frequency domain orthogonal basis vector pairs corresponding to the N ₄ time-domain sampling points Yes, the preset airspace-frequency domain orthogonal basis vector pair includes:

Optionally, each of the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponds to M ₁ same Doppler domain orthogonal basis vectors.

Optionally, the at least two sets of orthogonal basis vectors include:

The K ₁ ×M×M ₁ set of orthogonal basis vectors; or,

Orthogonal basis vector groups corresponding to non-zero coefficients in the K ₁ ×M×M ₁ orthogonal basis vector groups; or,

γ×K ₁ ×M×M ₁ orthogonal basis vector groups corresponding to γ×K ₁ ×M×M ₁ coefficients, the γ×K ₁ ×M×M ₁ coefficients are the non-zero coefficients ₁ large γ×K ₁ ×M×M, where γ is any constant between 0 and 1; or,

β×K ₁ ×M×γ×M ₁ orthogonal basis vector groups corresponding to β×K ₁ ×M×γ×M ₁ coefficients, the β×K ₁ ×M×γ×M ₁ coefficients are all 1 larger β×K ₁ ×M×γ× _M among the non-zero coefficients mentioned above, the said β is any constant between 0 and 1; or,

β×K ₁ ×M×M ₁ orthogonal basis vector groups corresponding to β×K ₁ ×M×M ₁ coefficients, the β×K ₁ ×M×M ₁ coefficients are the non-zero coefficients Large β×K ₁ ×M×M ₁ pieces.

Optionally, each of the N ₄ time-domain sampling points corresponds to a time-domain position of one symbol, a part of one symbol, at least two symbols, or at least one CSI-RS resource.

Optionally, the CSI report further includes third indication information, the third indication information is used to indicate at least one of the starting position and the window length of the first window, and the at least two orthogonal basis vector sets The Doppler domain orthogonal basis vector in is measured in the first window, and the window length of the first window is less than or equal to the N ₄ , or, the window length of the first window is less than or equal to the N ₄ and Doppler domain oversampling multiple product of .

Optionally, the channel prediction method further includes:

The network side device sends fourth indication information to the terminal, where the fourth indication information is used to indicate at least one of the starting position and the window length of the second window for measuring the Doppler domain orthogonal basis vector , and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is a Doppler domain window, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N ₄ , or the window length of the second window is less than or equal to the N ₄ and Doppler The product of domain oversampling multiples, the length of the third window is less than or equal to N3, and N3 is the number of frequency domain sampling points indicated by the network side device.

Optionally, the first indication information further includes Doppler oversampling identifiers corresponding to the M ₁ Doppler domain orthogonal basis vectors.

Optionally, the K ₁ ×M pairs of space domain-frequency domain orthogonal basis vectors correspond to the same Doppler oversampling identifier.

Optionally, the CSI report further includes the strongest coefficient indication SCI, the SCI is used to indicate the position of the coefficient with the largest amplitude value, and the position includes:

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.

Optionally, the CSI report further includes a bitmap of the coefficients;

The bit map is a bit map of the number K ^NZ of the first parameter whose value is the first preset value, wherein, if the target first parameter is equal to the first preset value, the second indication information includes Coefficients of M 1 Doppler domain orthogonal basis vectors corresponding to the K ₁ × _M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter; if the target first parameter is equal to the second preset value , the second indication information includes the preset number of M 1 Doppler domain orthogonal basis vectors corresponding to the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first _parameter Coefficients of the Puller domain orthogonal basis vectors; or,

Optionally, the CSI report does not include the bitmap when a preset condition is met, and the preset condition includes at least one of the following:

said M ₁ is equal to 1;

The values of the bitmap are all equal to 1.

The channel prediction method provided by the embodiment of the present application can reflect the Doppler domain information of the target downlink channel based on the codebook used in the CSI report reported by the terminal, so that the channel state information of the target downlink channel can be predicted according to the Doppler domain information .

The CSI reporting method provided in the embodiment of the present application may be executed by a CSI reporting device. In the embodiment of the present application, the CSI reporting device provided by the embodiment of the present application is described by taking the CSI reporting device executing the CSI reporting method as an example.

Please refer to FIG. 4. The CSI reporting device provided by the embodiment of the present application is applied to a terminal. As shown in FIG. 4, the CSI reporting device 400 may include the following modules:

The selection module 401 is configured to select at least two orthogonal basis vector groups according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each of the orthogonal basis vector groups includes more than one Orthogonal basis vectors in the Doppler domain, or each set of orthogonal basis vectors includes 1 orthogonal basis vector in the Doppler domain and also includes at least one of the following: 1 orthogonal basis vector in the space domain and 1 orthogonal basis vector in the frequency domain An intersection basis vector, the at least two symbols correspond to N ₄ time-domain sampling points, and N ₄ is an integer greater than 1;

The first sending module 402 is configured to send a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes each of the at least two orthogonal basis vector groups The identification information of an orthogonal basis vector, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination of at least two orthogonal basis vectors coefficient.

Optionally, select module 401, including:

The first selection unit is configured to select K ₁ spatial domain orthogonal basis vectors and M frequency domain orthogonal basis vectors according to the CSI-RS of at least two symbols transmitted on the target downlink channel to obtain K ₁ ×M spatial domain − Orthogonal basis vector pairs in the frequency domain;

The second selection unit is configured to select M ₁ Doppler domain orthogonal basis vectors for each of the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs, to obtain K ₁ ×M×M ₁ set of orthogonal basis vectors;

The K ₁ ×M space-frequency domain positive corresponding to the preset time-domain sampling points among the N ₄ time-domain sampling points cross-basis vector pair;

Optionally, the selection module 401 is also used to execute:

determining that the at least two sets of orthogonal basis vectors comprise the K ₁ ×M ×M ₁ sets of orthogonal basis vectors; or,

Determining that the at least two orthogonal basis vector sets include the orthogonal basis vector sets corresponding to non-zero coefficients in the K ₁ ×M ×M ₁ orthogonal basis vector sets; or,

determining that the at least two orthogonal basis vector sets include γ×K ₁ ×M×M ₁ orthogonal basis vector sets corresponding to γ×K ₁ ×M×M ₁ coefficients, the γ×K ₁ ×M× The M ₁ coefficients are the larger γ×K1×M×M ₁ of the non-zero coefficients, and the γ is any constant between 0 and 1; or,

It is determined that the at least two orthogonal basis vector sets include β×K ₁ ×M×γ×M ₁ orthogonal basis vector sets corresponding to β×K ₁ ×M×γ×M ₁ coefficients, the β×K ₁ ×M×γ×M ₁ coefficient is the larger β×K ₁ ×M×γ×M ₁ among the non-zero coefficients, and the β is any constant between 0 and 1; or,

It is determined that the at least two orthogonal basis vector sets include β×K ₁ ×M×M ₁ orthogonal basis vector sets corresponding to β×K ₁ ×M×M ₁ coefficients, and the β×K ₁ ×M× M ₁ coefficients are larger β×K ₁ ×M×M ₁ coefficients among the non-zero coefficients.

Optionally, the CSI reporting device 400 also includes:

A determining module, configured to determine the first window in the Doppler domain, the CSI report further includes third indication information, the third indication information is used to indicate at least one of the starting position and the window length of the first window One item, the Doppler domain orthogonal basis vectors in the at least two sets of orthogonal basis vectors are measured in the first window, and the window length of the first window is less than or equal to the N ₄ , or , the window length of the first window is less than or equal to the product of N ₄ and the Doppler domain oversampling multiple.

Optionally, each space domain-frequency domain orthogonal basis vector pair in the at least two sets of orthogonal basis vectors corresponds to the respective first window, or, in the at least two sets of orthogonal basis vectors all empty The domain-frequency domain orthogonal basis vector pair corresponds to the same first window.

Optionally, the CSI reporting device 400 also includes:

The second receiving module is configured to receive fourth indication information from the network side device, where the fourth indication information is used to indicate the starting position and window length of the second window for measuring the Doppler domain orthogonal basis vector and/or, the fourth indication information is used to indicate at least one of the starting position and window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is A window in the Doppler domain, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N4, or the window length of the second window is less than or equal to the _N4 and The product of the oversampling multiple in the Doppler domain, the length of the third window is less than or equal to N ₃ , and the N ₃ is the number of frequency domain sampling points indicated by the network side device;

The selection module 401 is specifically configured to perform at least one of the following:

selecting a Doppler domain orthogonal basis vector of the CSI-RS within the second window;

Selecting the CSI-RS within the third window needs to calculate the frequency domain orthogonal basis vector of Doppler domain information;

Select the frequency-domain orthogonal basis vector of the CSI-RS within the third window.

Optionally, the CSI reporting device 400 also includes:

An acquisition module, configured to acquire a Doppler oversampling multiple O ₃ , the Doppler oversampling multiple O ₃ including O ₃ Doppler oversampling identifications;

Select module 401, specifically for:

Select M ₁ Doppler domain orthogonal basis vectors from N ₄ × O ₃ candidate Doppler domain orthogonal basis vectors;

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.

Optionally, the CSI report further includes a bitmap of the coefficients;

The bit map is a bit map of the number K ^NZ of the first parameter whose value is the first preset value, wherein, if the target first parameter is equal to the first preset value, the second indication information includes The target No. K ₁ × M space domain-frequency domain orthogonal basis vectors corresponding to a parameter The coefficients of M ₁ Doppler domain orthogonal basis vectors corresponding; If the first parameter of the target is equal to the second preset value, then the The second indication information includes the preset Doppler domain orthogonality among the M ₁ Doppler domain orthogonal basis vectors corresponding to the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter. the coefficients of the intersecting basis vectors; or,

said M ₁ is equal to 1;

The values of the bitmap are all equal to 1.

The CSI reporting apparatus 400 in this embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in the electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or other devices other than the terminal. Exemplarily, the terminal may include, but is not limited to, the types of terminal 11 listed above, and other devices may be servers, Network Attached Storage (Network Attached Storage, NAS), etc., which are not specifically limited in this embodiment of the present application.

The CSI reporting apparatus 400 provided by the embodiment of the present application can realize each process realized by the method embodiment shown in FIG. 2 and achieve the same technical effect. To avoid repetition, details are not repeated here.

The channel prediction method provided in the embodiment of the present application may be executed by a channel prediction device. In the embodiment of the present application, the channel prediction device provided in the embodiment of the present application is described by taking the channel prediction method performed by the channel prediction device as an example.

Please refer to FIG. 5, a channel prediction device provided in the embodiment of the present application can be applied to network side equipment. As shown in FIG. 5, the channel prediction device 500 may include the following modules:

The second sending module 501 is configured to send the channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N ₄ time domain sampling points, and N ₄ is greater than 1 an integer of

The first receiving module 502 is configured to receive a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each of at least two orthogonal basis vector groups Orthogonal basis vector identification information, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors , each of the at least two sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes a Doppler-domain normal The orthogonal basis vectors also include at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector;

The channel prediction module 503 is configured to predict the channel state information of the target downlink channel according to the CSI report.

The _K1 is the number of space domain orthogonal vector bases indicated by the network side equipment, the M is the number of frequency domain orthogonal vector bases indicated by the network side equipment, and the _M1 is the Doppler domain indicated by the network side equipment The number of orthogonal vector bases, K ₁ , M and M ₁ are respectively positive integers.

Optionally, the at least two sets of orthogonal basis vectors include:

The K ₁ ×M×M ₁ set of orthogonal basis vectors; or,

β×K ₁ ×M×γ×M1 orthogonal basis vector groups corresponding to β×K ₁ ×M×γ×M1 coefficients, the β×K ₁ ×M×γ×M ₁ coefficients are the non _One larger β×K ₁ ×M×γ×M among the zero coefficients, where β is any constant between 0 and 1; or,

Optionally, the set of β×K1×M×γ×M ₁ orthogonal basis vectors includes coefficients selected from K ₁ ×M pairs of space-frequency domain orthogonal basis vectors that are not zero and have relatively large coefficients β×K ₁ ×M , and each of the β×K ₁ ×M spatial-frequency domain orthogonal basis vector pairs corresponds to the coefficients of γ×M ₁ Doppler domain orthogonal basis vectors, where , the γ×M ₁ Doppler-domain orthogonal basis vectors are γ×M ₁ ones among the M ₁ Doppler-domain orthogonal basis vectors with non-zero coefficients and relatively large amplitudes.

Optionally, the CSI report further includes third indication information, the third indication information is used to indicate at least one of the starting position and the window length of the first window, and the at least two orthogonal basis vector sets The Doppler domain orthogonal basis vector in is measured in the first window, and the window length of the first window is less than or equal to the N ₄ , or, the window length of the first window is less than or equal to the The product of N ₄ and the oversampling factor in the Doppler domain.

Optionally, the channel prediction device 500 also includes:

The third sending module is configured to send fourth indication information to the terminal, where the fourth indication information is used to indicate at least one of the starting position and the window length of the second window for measuring the Doppler domain orthogonal basis vector one, and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is Doppler a window in the Le domain, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N ₄ , or the window length of the second window is less than or equal to the N ₄ and more The product of the oversampling multiple in the Puller domain, the length of the third window is less than or equal to N3, and the N3 is the number of sampling points in the frequency domain indicated by the network side device.

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.

Optionally, the CSI report further includes a bitmap of the coefficients;

said M ₁ is equal to 1;

The values of the bitmap are all equal to 1.

The channel prediction apparatus 500 provided in the embodiment of the present application can realize each process realized by the method embodiment shown in FIG. 3 and achieve the same technical effect. To avoid repetition, details are not repeated here.

Optionally, as shown in FIG. 6 , the embodiment of the present application also provides a communication device 600, including a processor 601 and a memory 602, and the memory 602 stores programs or instructions that can run on the processor 601, such as , when the communication device 600 is a terminal, when the program or instruction is executed by the processor 601, each step of the above CSI reporting method embodiment is implemented, and the same technical effect can be achieved. When the communication device 600 is a network-side device, when the program or instruction is executed by the processor 601, the steps of the above-mentioned channel prediction method embodiment can be achieved, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

The embodiment of the present application also provides a terminal, including a processor and a communication interface, the processor is used to select at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, each The set of orthogonal basis vectors includes 1 spatial domain orthogonal basis vector, 1 frequency domain orthogonal basis vector and 1 Doppler domain orthogonal basis vector, and the at least two symbols correspond to N ₄ time domain sampling points , N ₄ is an integer greater than 1, the communication interface is used to send a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes the at least two The identification information of each orthogonal basis vector in the set of orthogonal basis vectors, the second indication information includes at least one of the following items: the coefficient of each orthogonal basis vector in the at least two sets of orthogonal basis vectors and at least two Combination coefficients of orthogonal basis vectors. This terminal embodiment corresponds to the above-mentioned terminal-side method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this terminal embodiment, and can achieve the same technical effect. Specifically, FIG. 7 is a schematic diagram of a hardware structure of a terminal implementing an embodiment of the present application.

The terminal 700 includes, but is not limited to: a radio frequency unit 701, a network module 702, an audio output unit 703, an input unit 704, a sensor 705, a display unit 706, a user input unit 707, an interface unit 708, a memory 709, and a processor 710. At least some parts.

Those skilled in the art can understand that the terminal 700 may also include a power supply (such as a battery) for supplying power to various components, and the power supply may be logically connected to the processor 710 through the power management system, so as to manage charging, discharging, and power consumption through the power management system. Management and other functions. The terminal structure shown in FIG. 7 does not constitute a limitation on the terminal, and the terminal may include more or fewer components than shown in the figure, or combine some components, or arrange different components, which will not be repeated here.

It should be understood that, in this embodiment of the present application, the input unit 704 may include a graphics processing unit (Graphics Processing Unit, GPU) 7041 and a microphone 7042, and the graphics processor 7041 is used by the image capture device ( Such as the image data of the still picture or video obtained by the camera) for processing. The display unit 706 may include a display panel 7061, and the display panel 7061 may be configured in the form of a liquid crystal display, an organic light emitting diode, or the like. The user input unit 707 includes at least one of a touch panel 7071 and other input devices 7072 . The touch panel 7071 is also called a touch screen. The touch panel 7071 may include two parts, a touch detection device and a touch controller. Other input devices 7072 may include, but are not limited to, physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, and joysticks, which will not be described in detail here.

In the embodiment of the present application, the radio frequency unit 701 may transmit the downlink data from the network side device to the processor 710 for processing after receiving the downlink data; in addition, the radio frequency unit 701 may send uplink data to the network side device. Generally, the radio frequency unit 701 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like.

The memory 709 can be used to store software programs or instructions as well as various data. The memory 709 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instructions required by at least one function (such as a sound playing function, image playback function, etc.), etc. Furthermore, memory 709 may include volatile memory or nonvolatile memory, or, memory 709 may include both volatile and nonvolatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), electronically programmable Erase Programmable Read-Only Memory (Electrically EPROM, EEPROM) or Flash. Volatile memory can be random access memory (Random Access Memory, RAM), static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (Double Data Rate SDRAM, DDRSDRAM), enhanced synchronous dynamic random access memory (Enhanced SDRAM, ESDRAM), synchronous connection dynamic random access memory (Synch link DRAM , SLDRAM) and Direct Memory Bus Random Access Memory (Direct Rambus RAM, DRRAM). The memory 709 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

The processor 710 may include one or more processing units; optionally, the processor 710 integrates an application processor and a modem processor, wherein the application processor mainly handles operations related to the operating system, user interface, and application programs, etc., Modem processors mainly process wireless communication signals, such as baseband processors. It can be understood that the foregoing modem processor may not be integrated into the processor 710 .

Wherein, the processor 710 is configured to select at least two orthogonal basis vector groups according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each of the orthogonal The base vector group includes 1 space domain orthogonal base vector, 1 frequency domain orthogonal base vector and 1 Doppler domain orthogonal base vector, the at least two symbols correspond to N ₄ time domain sampling points, N ₄ is an integer greater than 1;

The radio frequency unit 701 is configured to send a CSI report to the network side device, where the CSI report includes first indication information and second indication information, and the first indication information includes each of the at least two orthogonal basis vector groups The identification information of the orthogonal basis vectors, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two sets of orthogonal basis vectors and the combination coefficient of the at least two orthogonal basis vectors.

Optionally, the selecting at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel performed by the processor 710 includes:

According to the CSI-RS of at least two symbols transmitted on the target downlink channel, K ₁ space-domain orthogonal basis vectors and M frequency-domain orthogonal basis vectors are selected to obtain K ₁ ×M space-frequency domain orthogonal basis vector pairs ;

Selecting M ₁ Doppler domain orthogonal basis vectors for each of the K ₁ ×M space domain-frequency domain orthogonal basis vector pairs respectively, to obtain K ₁ ×M×M ₁ orthogonal basis vector groups;

Optionally, the selecting at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel performed by the processor 710 further includes:

determining that the at least two orthogonal basis vector sets include γ×K ₁ ×M×M ₁ orthogonal basis vector sets corresponding to γ×K ₁ ×M×M ₁ coefficients, the γ×K ₁ ×M× M ₁ coefficients for the non-zero coefficients ₁ of the larger γ×K1×M×M, said γ is any constant between 0 and 1; or,

Optionally, the processor 710 is further configured to determine a first window in the Doppler domain, and the CSI report further includes third indication information, where the third indication information is used to indicate a starting position of the first window and at least one item in the window length, the Doppler domain orthogonal basis vectors in the at least two orthogonal basis vector groups are measured in the first window, and the window length of the first window is less than or equal to The N ₄ , or, the window length of the first window is less than or equal to the product of the N ₄ and the Doppler domain oversampling multiple.

Optionally, the radio frequency unit 701 is further configured to receive fourth indication information from the network side device, where the fourth indication information is used to indicate the starting position of the second window for measuring the Doppler domain orthogonal basis vector and at least one of the window length, and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the The second window is a window in the Doppler domain, the third window is a window in the delay domain, and the window length of the second window is less than or equal to the N4, or, the window length of the second window is less than or equal to the The product of N ₄ and the oversampling multiple in the Doppler domain, the length of the third window is less than or equal to N ₃ , and the N ₃ is the number of frequency domain sampling points indicated by the network side device;

The selection of at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel performed by the processor 710 includes:

and / or,

Selecting the CSI-RS in the third window needs to calculate the frequency domain orthogonality of the Doppler domain information basis vector;

and / or,

Optionally, the radio frequency unit 701 is also used to obtain a Doppler oversampling multiple O ₃ , where the Doppler oversampling multiple O ₃ includes O ₃ Doppler oversampling identifiers;

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.

Optionally, the CSI report further includes a bitmap of the coefficients;

said M ₁ is equal to 1;

The values of the bitmap are all equal to 1.

The terminal 700 provided in the embodiment of the present application can implement each of the CSI reporting devices shown in FIG. 4 The implementation process of the module can achieve the same beneficial effects as the CSI reporting device shown in FIG. 4 , which will not be repeated here.

The embodiment of the present application also provides a network side device, including a processor and a communication interface, the communication interface is used to send the channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, and the at least The two symbols correspond to N ₄ sampling points in the time domain, where N ₄ is an integer greater than 1, and a CSI report from the terminal is received, the CSI report includes first indication information and second indication information, and the first indication The information includes identification information of each orthogonal basis vector in at least two sets of orthogonal basis vectors, and the second indication information includes at least one of the following: each orthogonal basis vector in the at least two sets of orthogonal basis vectors The coefficients and the combination coefficients of at least two orthogonal basis vectors, each of the at least two orthogonal basis vector groups includes 1 Doppler domain orthogonal basis vector, or each of the The set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector; the processor is configured to report, predicting channel state information of the target downlink channel. The network-side device embodiment corresponds to the above-mentioned network-side device method embodiment, and each implementation process and implementation mode of the above-mentioned method embodiment can be applied to this network-side device embodiment, and can achieve the same technical effect.

Specifically, the embodiment of the present application also provides a network side device. As shown in FIG. 8 , the network side device 800 includes: an antenna 801 , a radio frequency device 802 , a baseband device 803 , a processor 804 and a memory 805 . The antenna 801 is connected to the radio frequency device 802 . In the uplink direction, the radio frequency device 802 receives information through the antenna 801, and sends the received information to the baseband device 803 for processing. In the downlink direction, the baseband device 803 processes the information to be sent and sends it to the radio frequency device 802 , and the radio frequency device 802 processes the received information and sends it out through the antenna 801 .

The method performed by the network side device in the above embodiments may be implemented in the baseband device 803, where the baseband device 803 includes a baseband processor.

The baseband device 803 may include at least one baseband board, for example, a plurality of chips are arranged on the baseband board, as shown in FIG. The program executes the network device operations shown in the above method embodiments.

The network side device may also include a network interface 806, such as a common public radio interface (common public radio interface, CPRI).

Specifically, the network-side device 800 in this embodiment of the present invention further includes: instructions or programs stored in the memory 805 and operable on the processor 804, and the processor 804 calls the instructions or programs in the memory 805 to execute the various programs shown in FIG. The method of module execution achieves the same technical effect, so in order to avoid repetition, it is not repeated here.

The embodiment of the present application also provides a readable storage medium, the readable storage medium stores a program or an instruction, and when the program or instruction is executed by a processor, the above-mentioned CSI reporting method or channel prediction is realized Each process of the method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.

Wherein, the processor is the processor in the terminal described in the foregoing embodiments. The readable storage medium includes a computer-readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk, and the like.

The embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above-mentioned CSI reporting method or channel prediction Each process of the method embodiment can achieve the same technical effect, and will not be repeated here to avoid repetition.

It should be understood that the chip mentioned in the embodiment of the present application may also be called a system-on-chip, a system-on-chip, a system-on-a-chip, or a system-on-a-chip.

An embodiment of the present application further provides a computer program/program product, the computer program/program product is stored in a storage medium, and the computer program/program product is executed by at least one processor to implement the above-mentioned CSI reporting method or channel Each process in the embodiment of the prediction method can achieve the same technical effect, and will not be repeated here to avoid repetition.

The embodiment of the present application also provides a wireless communication system, including: a terminal and a network-side device, the terminal can be used to perform the steps of the above CSI reporting method, and the network-side device can be used to perform the above-mentioned channel The steps of the prediction method can achieve the same technical effect as the method embodiment shown in FIG. 2 and FIG. 3 , and will not be repeated here to avoid repetition.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. Functions are performed, for example, the described methods may be performed in an order different from that described, and various steps may also be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of computer software products, which are stored in a storage medium (such as ROM/RAM, magnetic CD, CD), including several instructions to make a terminal (which can be a mobile phone, computer, server, air conditioner, or network equipment, etc.) execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims

A method for reporting channel state information CSI, comprising:

The terminal selects at least two sets of orthogonal basis vectors according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each set of orthogonal basis vectors includes a Doppler domain orthogonal basis vectors, or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 space domain orthogonal basis vector and 1 frequency domain orthogonal basis vector, so The at least two symbols correspond to N 4 time-domain sampling points, and N 4 is an integer greater than 1;

The terminal sends a CSI report to the network side device, the CSI report includes first indication information and second indication information, and the first indication information includes each orthogonal basis vector in the at least two orthogonal basis vector groups The second indication information includes at least one of the following items: coefficients of each orthogonal basis vector in the at least two sets of orthogonal basis vectors and combination coefficients of at least two orthogonal basis vectors.
The method according to claim 1, wherein the terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, including:

The terminal selects K 1 space-domain orthogonal basis vectors and M frequency-domain orthogonal basis vectors according to the CSI-RS of at least two symbols transmitted on the target downlink channel to obtain K 1 ×M space-frequency domain orthogonal pair of basis vectors;

The terminal selects M 1 Doppler domain orthogonal basis vectors for each of the K 1 ×M space domain-frequency domain orthogonal basis vector pairs, and obtains K 1 ×M×M 1 orthogonal basis vectors vector group;

Wherein, the K 1 is the number of space domain orthogonal vector bases indicated by the network side equipment, the M is the number of frequency domain orthogonal vector bases indicated by the network side equipment, and the M 1 is the Doppler frequency domain indicated by the network side equipment. The number of Le field orthogonal vector bases, K 1 , M and M 1 are respectively positive integers.
The method according to claim 2, wherein the K 1 ×M space-frequency domain orthogonal basis vector pairs are jointly selected according to the N 4 time-domain sampling points; or,

The K 1 ×M pairs of space-frequency domain orthogonal basis vectors are preset space-frequency domain orthogonal basis vectors in the space-frequency domain orthogonal basis vector pairs corresponding to the N 4 time-domain sampling points Yes, the preset airspace-frequency domain orthogonal basis vector pair includes:

K 1 ×M space-frequency domain orthogonal basis vector pairs corresponding to the preset time-domain sampling points among the N 4 time-domain sampling points;

K 1 ×M pairs of space-frequency domain orthogonal basis vectors with larger power values of the equivalent channel selected from the space-frequency domain orthogonal basis vector pairs corresponding to the N 4 time-domain sampling points.
The method according to claim 2, wherein each of the K 1 ×M pairs of space domain-frequency domain orthogonal basis vectors corresponds to M 1 same Doppler domain orthogonal basis vectors.
The method according to claim 2, wherein the terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, further comprising:

The terminal determines that the at least two sets of orthogonal basis vectors include the K 1 ×M×M 1 sets of orthogonal basis vectors; or,

The terminal determines that the at least two sets of orthogonal basis vectors include sets of orthogonal basis vectors corresponding to non-zero coefficients among the K 1 ×M×M 1 sets of orthogonal basis vectors; or,

The terminal determines that the at least two orthogonal basis vector sets include γ×K 1 ×M×M 1 orthogonal basis vector sets corresponding to γ×K 1 ×M×M 1 coefficients, and the γ×K 1 ×M×M 1 coefficient is the larger γ×K1×M×M 1 among the non-zero coefficients, and the γ is any constant between 0 and 1; or,

The terminal determines that the at least two orthogonal basis vector sets include β×K 1 ×M×γ×M 1 orthogonal basis vector sets corresponding to β×K 1 ×M×γ×M 1 coefficients, the The β×K 1 ×M×γ×M 1 coefficients are the larger β×K 1 ×M×γ×M 1 coefficients among the non-zero coefficients, and the β is any constant between 0 and 1; or ,

The terminal determines that the at least two orthogonal basis vector sets include β×K 1 ×M×M 1 orthogonal basis vector sets corresponding to β×K 1 ×M×M 1 coefficients, and the β×K 1 The ×M×M 1 coefficients are the larger β×K 1 ×M×M 1 coefficients among the non-zero coefficients.
The method according to claim 5, wherein the β×K 1 ×M×γ×M 1 sets of orthogonal basis vectors include coefficients selected from K 1 ×M space-frequency domain orthogonal basis vector pairs β×K 1 ×M that are not zero and have large coefficient magnitudes, and each of the β×K 1 ×M spatial-frequency domain orthogonal basis vector pairs corresponds to γ×M 1 Doppler domain The coefficients of the orthogonal basis vectors, wherein the γ×M 1 Doppler domain orthogonal basis vectors are the γ×M 1 Doppler domain orthogonal basis vectors with non-zero coefficients and relatively large amplitudes M 1 .
The method according to claim 1, wherein each of the N 4 time-domain sampling points corresponds to a symbol, a part of a symbol, at least two symbols, or the time of at least one CSI-RS resource domain location.
The method according to claim 2, wherein the method further comprises:

The terminal determines a first window in the Doppler domain, and the CSI report further includes third indication information, where the third indication information is used to indicate at least one of a starting position and a window length of the first window , the Doppler domain orthogonal basis vectors in the at least two sets of orthogonal basis vectors are measured in the first window, and the window length of the first window is less than or equal to the N 4 , or, the The window length of the first window is less than or equal to the product of N 4 and the oversampling multiple in the Doppler domain.
The method according to claim 8, wherein each space-frequency domain orthogonal basis vector pair in the at least two orthogonal basis vector groups corresponds to the first window respectively, or the at least two All the airspace-frequency domain orthogonal basis vector pairs in the four orthogonal basis vector groups correspond to the same first window.
The method according to claim 1 or 9, wherein the method further comprises:

The terminal receives fourth indication information from the network side device, where the fourth indication information is used to indicate at least one of the starting position and the window length of the second window for measuring the Doppler domain orthogonal basis vector , and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is a Doppler domain window, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N 4 , or the window length of the second window is less than or equal to the N 4 and Doppler The product of domain oversampling multiples, the length of the third window is less than or equal to N 3 , where N 3 is the number of frequency domain sampling points indicated by the network side device;

The terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, including:

The terminal selects the Doppler domain orthogonal basis vector of the CSI-RS within the second window;

and / or,

The terminal selects the CSI-RS frequency domain orthogonal basis vector that needs to calculate Doppler domain information in the third window;

and / or,

The terminal selects the frequency-domain orthogonal basis vector of the CSI-RS within the third window.
The method according to claim 2 or 8, wherein the method further comprises:

The terminal acquires a Doppler oversampling multiple O 3 , and the Doppler oversampling multiple O 3 includes O 3 Doppler oversampling identifiers;

The terminal selects at least two orthogonal basis vector groups according to the CSI-RS of at least two symbols transmitted on the target downlink channel, including:

The terminal selects M 1 Doppler domain orthogonal basis vectors from N 4 ×O 3 candidate Doppler domain orthogonal basis vectors;

Wherein, the first indication information further includes Doppler oversampling identifiers corresponding to the M 1 Doppler domain orthogonal basis vectors.
The method according to claim 11, wherein the K 1 ×M space domain-frequency domain orthogonal basis vector pairs correspond to the same Doppler oversampling identifier.
The method according to claim 11, wherein the CSI report further includes the strongest coefficient indication SCI, the SCI is used to indicate the position of the coefficient with the largest amplitude value, and the position includes:

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.
The method according to claim 2, wherein the CSI report further comprises a bitmap of the coefficients;

The bitmap is the bit of the product of the coefficients of the K 1 spatial domain orthogonal basis vectors, the coefficients of the M frequency domain orthogonal basis vectors, and the coefficients of the M 1 Doppler domain orthogonal basis vectors Figure; or,

The bit map is a bit map of the number K NZ of the first parameter whose value is the first preset value, wherein, if the target first parameter is equal to the first preset value, the second indication information includes Coefficients of M 1 Doppler domain orthogonal basis vectors corresponding to the K 1 ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter; if the target first parameter is equal to the second preset value , the second indication information includes the preset number of M 1 Doppler domain orthogonal basis vectors corresponding to the K 1 ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter Coefficients of the Puller domain orthogonal basis vectors; or,

The bitmap is a bitmap of the product of the K NZ and the coefficients of the M 1 Doppler domain orthogonal basis vectors.
The method according to claim 14, wherein, if a preset condition is met, the CSI report does not include the bitmap, and the preset condition includes at least one of the following:

said M 1 is equal to 1;

The values of the bitmap are all equal to 1.
A channel state information CSI reporting device, applied to a terminal, the device includes:

The selection module is configured to select at least two sets of orthogonal basis vectors according to the channel state information reference signal CSI-RS of at least two symbols transmitted on the target downlink channel, and each set of orthogonal basis vectors includes 1 Doppler Orthogonal basis vectors in Le domain, or each set of orthogonal basis vectors includes 1 Doppler domain orthogonal basis vector and also includes at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector A base vector, the at least two symbols correspond to N 4 time-domain sampling points, and N 4 is an integer greater than 1;

A first sending module, configured to send a CSI report to a network side device, where the CSI report includes first indication information and second indication information, and the first indication information includes each of the at least two orthogonal basis vector groups Orthogonal basis vector identification information, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors .
A channel prediction method, comprising:

The network side device sends a channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N 4 sampling points in the time domain, and N 4 is an integer greater than 1;

The network-side device receives a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each orthogonal basis in at least two orthogonal basis vector groups Vector identification information, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors, the Each of the at least two sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis The vector also includes at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector;

The network side device predicts the channel state information of the target downlink channel according to the CSI report.
The method according to claim 17, wherein the at least two sets of orthogonal basis vectors are K 1 ×M×M 1 sets of orthogonal basis vectors, and the K 1 ×M ×M 1 sets of orthogonal basis vectors The group includes K 1 ×M space domain-frequency domain orthogonal basis vector pairs and M 1 Doppler domain orthogonal basis vectors corresponding to each of the K 1 ×M space domain-frequency domain orthogonal basis vector pairs;

The K1 is the number of space domain orthogonal vector bases indicated by the network side equipment, the M is the number of frequency domain orthogonal vector bases indicated by the network side equipment, and the M1 is the Doppler domain indicated by the network side equipment The number of orthogonal vector bases, K 1 , M and M 1 are respectively positive integers.
The method according to claim 18, wherein the K 1 ×M space-frequency domain orthogonal basis vector pairs are jointly selected according to the N 4 time-domain sampling points; or,

The K 1 ×M pairs of space-frequency domain orthogonal basis vectors are preset space-frequency domain orthogonal basis vectors in the space-frequency domain orthogonal basis vector pairs corresponding to the N 4 time-domain sampling points Yes, the preset airspace-frequency domain orthogonal basis vector pair includes:

K 1 ×M space-frequency domain orthogonal basis vector pairs corresponding to the preset time-domain sampling points among the N 4 time-domain sampling points;

K 1 ×M pairs of space-frequency domain orthogonal basis vectors with larger power values of the equivalent channel selected from the space-frequency domain orthogonal basis vector pairs corresponding to the N 4 time-domain sampling points.
The method according to claim 18, wherein each of the K 1 ×M pairs of space domain-frequency domain orthogonal basis vectors corresponds to M 1 same Doppler domain orthogonal basis vectors.
The method of claim 18, wherein the at least two sets of orthogonal basis vectors comprise:

The K 1 ×M×M 1 set of orthogonal basis vectors; or,

Orthogonal basis vector groups corresponding to non-zero coefficients in the K 1 ×M×M 1 orthogonal basis vector groups; or,

γ×K 1 ×M×M 1 orthogonal basis vector groups corresponding to γ×K 1 ×M×M 1 coefficients, the γ×K 1 ×M×M 1 coefficients are the non-zero coefficients 1 large γ×K 1 ×M×M, where γ is any constant between 0 and 1; or,

β×K 1 ×M×γ×M1 orthogonal basis vector groups corresponding to β×K 1 ×M×γ×M1 coefficients, the β×K 1 ×M×γ×M 1 coefficients are the non One larger β×K 1 ×M×γ×M among the zero coefficients, where β is any constant between 0 and 1; or,

β×K 1 ×M×M 1 orthogonal basis vector groups corresponding to β×K 1 ×M×M 1 coefficients, the β×K 1 ×M×M 1 coefficients are the non-zero coefficients Large β×K 1 ×M×M 1 pieces.
The method according to claim 21, wherein the β×K1×M×γ×M 1 sets of orthogonal basis vectors include coefficients selected from K 1 ×M space-frequency domain orthogonal basis vector pairs. is zero and β×K 1 ×M coefficients with large magnitudes, and each of the β×K 1 ×M spatial-frequency domain orthogonal basis vector pairs corresponds to γ×M 1 Doppler domain orthogonal basis vectors , wherein the γ×M 1 Doppler-domain orthogonal basis vectors are γ×M 1 γ×M 1 Doppler-domain orthogonal basis vectors with non-zero coefficients and relatively large amplitudes.
The method according to claim 17, wherein each of the N 4 time-domain sampling points corresponds to a symbol, a part of a symbol, at least two symbols, or the time of at least one CSI-RS resource domain location.
The method according to claim 18, wherein the CSI report further includes third indication information, the third indication information is used to indicate at least one of the starting position of the first window and the window length, and the at least The Doppler domain orthogonal basis vectors in the two orthogonal basis vector groups are measured in the first window, and the window length of the first window is less than or equal to the N 4 , or, the first window The window length is less than or equal to the product of N 4 and the oversampling multiple in the Doppler domain.
The method according to claim 24, wherein each space domain-frequency domain orthogonal basis vector pair in the at least two orthogonal basis vector groups corresponds to the respective first window, or the at least two All the airspace-frequency domain orthogonal basis vector pairs in the four orthogonal basis vector groups correspond to the same first window.
The method according to claim 17 or 25, wherein the method further comprises:

The network side device sends fourth indication information to the terminal, where the fourth indication information is used to indicate at least one of the starting position and the window length of the second window for measuring the Doppler domain orthogonal basis vector , and/or, the fourth indication information is used to indicate at least one of the starting position and the window length of the third window for measuring the frequency-domain orthogonal basis vector, wherein the second window is a Doppler domain window, the third window is a window in the delay domain, the window length of the second window is less than or equal to the N 4 , or the window length of the second window is less than or equal to the N 4 and Doppler The product of domain oversampling multiples, the length of the third window is less than or equal to N3, and N3 is the number of frequency domain sampling points indicated by the network side device.
The method according to claim 18 or 24, wherein the first indication information further includes Doppler oversampling identifiers corresponding to the M 1 Doppler domain orthogonal basis vectors.
The method according to claim 27, wherein the K 1 ×M pairs of space domain-frequency domain orthogonal basis vectors correspond to the same Doppler oversampling identifier.
The method according to claim 27, wherein the CSI report further includes the strongest coefficient indication SCI, the SCI is used to indicate the position of the coefficient with the largest amplitude value, and the position includes:

airspace position, frequency domain position, and Doppler domain position; or,

Combined spatial-frequency domain location and Doppler domain location; or,

the location of the joint spatial-frequency-Doppler domain; or,

Doppler domain location.
The method of claim 18, wherein the CSI report further includes the coefficient bitmap;

The bitmap is the bit of the product of the coefficients of the K 1 spatial domain orthogonal basis vectors, the coefficients of the M frequency domain orthogonal basis vectors, and the coefficients of the M 1 Doppler domain orthogonal basis vectors Figure; or,

The bit map is a bit map of the number K NZ of the first parameter whose value is the first preset value, wherein, if the target first parameter is equal to the first preset value, the second indication information includes Coefficients of M 1 Doppler domain orthogonal basis vectors corresponding to the K 1 ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter; if the target first parameter is equal to the second preset value , the second indication information includes the preset number of M 1 Doppler domain orthogonal basis vectors corresponding to the K 1 ×M space domain-frequency domain orthogonal basis vector pairs corresponding to the target first parameter Coefficients of the Puller domain orthogonal basis vectors; or,

The bitmap is a bitmap of the product of the K NZ and the coefficients of the M 1 Doppler domain orthogonal basis vectors.
The method according to claim 30, wherein, if a preset condition is met, the CSI report does not include the bitmap, and the preset condition includes at least one of the following:

said M 1 is equal to 1;

The values of the bitmap are all equal to 1.
A channel prediction device applied to network side equipment, the device comprising:

The second sending module is configured to send the channel state information reference signal CSI-RS to the terminal through at least two symbols on the target downlink channel, the at least two symbols correspond to N 4 time domain sampling points, and N 4 is greater than 1 integer;

The first receiving module is configured to receive a CSI report from the terminal, the CSI report includes first indication information and second indication information, and the first indication information includes each of at least two orthogonal basis vector groups The identification information of the orthogonal basis vector, the second indication information includes at least one of the following: the coefficient of each orthogonal basis vector in the at least two orthogonal basis vector groups and the combination coefficient of at least two orthogonal basis vectors, Each of the at least two sets of orthogonal basis vectors includes a Doppler-domain orthogonal basis vector, or each of the sets of orthogonal basis vectors includes a Doppler-domain orthogonal The basis vectors also include at least one of the following: 1 spatial domain orthogonal basis vector and 1 frequency domain orthogonal basis vector;

A channel prediction module, configured to predict channel state information of the target downlink channel according to the CSI report.
A terminal, comprising a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, any one of claims 1 to 15 is implemented Steps in the method for reporting channel state information CSI.
A network-side device, comprising a processor and a memory, the memory stores programs or instructions that can run on the processor, and when the programs or instructions are executed by the processor, any of claims 17 to 31 can be implemented. A step of the channel prediction method described in one item.
A readable storage medium, on which a program or an instruction is stored, and when the program or instruction is executed by a processor, the channel state information CSI reporting method according to any one of claims 1 to 15 is realized steps, or realize the steps of the channel prediction method according to any one of claims 17 to 31.