CN114726421A

CN114726421A - Channel feedback method, information transmission method and equipment

Info

Publication number: CN114726421A
Application number: CN202110005389.9A
Authority: CN
Inventors: 吴丹; 孙军帅; 金婧; 苏鑫; 王启星
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2022-07-08
Also published as: WO2022148380A1; WO2022148380A9

Abstract

The invention provides a channel feedback method, an information transmission method and equipment, which solve the problem that a terminal in the prior art cannot perform channel estimation and feedback on a reflection channel. The method of the invention comprises the following steps: receiving a class I reference signal and a class II reference signal, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook; feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal; and feeding back the code word selected based on the II type codebook and the corresponding codebook type based on the II type reference signal. The invention can realize channel estimation and feedback of the reflection channel by introducing the II-type reference signal, thereby accurately reflecting the characteristics of the reflection channel, so that the base station can obtain accurate channel information and provide accurate basis for the precoding calculation when the subsequent base station side carries out beamforming.

Description

Channel feedback method, information transmission method and equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a channel feedback method, an information transmission method, and an apparatus.

Background

The intelligent reflecting plate is a novel intelligent passive surface, and the phase of the surface is controlled in real time by utilizing metamaterials (Meta-materials), so that the reflecting angle of incident waves is controlled, and reflecting beams in different directions are formed. The intelligent reflector has the characteristics of low cost and low power consumption, so that the intelligent reflector can realize signal forwarding without a complex Radio Frequency (RF) circuit.

In existing systems, the terminal estimates only this base station to terminal channel, and even in relay/access backhaul Integrated (IAB) systems, the terminal estimates the individual relay to terminal channel. In the intelligent reflective surface system, only the channel of the signal after surface reflection can be estimated by the terminal, and the channel characteristics and the structure of the channel are greatly different from those of a common transmitting node-receiving node channel. However, in the prior art, the terminal cannot perform channel estimation and feedback on the reflected channel.

Disclosure of Invention

The invention aims to provide a channel feedback method, an information transmission method and equipment, which are used for solving the problem that a terminal in the prior art cannot perform channel estimation and feedback on a reflection channel.

In order to achieve the above object, the present invention provides a channel feedback method, applied to a terminal, including:

receiving a class I reference signal and a class II reference signal, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook;

feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal;

and feeding back the code word selected based on the II type codebook and the corresponding codebook type based on the II type reference signal.

The I-type reference signal is one of a reference signal without node equipment and a reference signal without node equipment parameter adjustment;

the type II reference signal is one of a reference signal when node equipment exists and a reference signal when the parameter of the node equipment is adjusted, and the node equipment has a function of reflecting the signal or forwarding the reflected signal.

Wherein the method further comprises:

and receiving the configuration information of the II-type reference signal and a II-type codebook corresponding to the II-type reference signal.

Wherein the phase and/or amplitude of the node device is configured by a base station or determined by the node device.

Wherein the method further comprises:

acquiring channel state information and/or position related information of a terminal, wherein the channel state information is obtained by the type I reference signal, and the position related information comprises geographical position information and/or a receiving angle;

reporting target information to a base station, so that the base station sends a class II reference signal under the condition that the distance between the terminal and the node equipment is determined to be within a preset range according to the target information and the uplink measurement information; or, when it is determined that the distance between the terminal and the node device is within a preset range according to the target information, sending a first request to the base station, where the first request is used to request the base station to send a class II reference signal, and the target information includes the channel state information and/or the location related information.

Wherein the feeding back the code word selected based on the class II codebook and the corresponding codebook type based on the class II reference signal includes:

obtaining a class II reference signal configuration parameter, wherein the class II reference signal configuration parameter includes: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the feeding back the code word selected based on the class II codebook and the corresponding codebook type based on the class II reference signal further includes:

based on the configuration parameters of the II-type reference signals, subtracting the channel estimated by the II-type reference signals configured according to the corresponding first parameters at the first time domain position from the channel estimated by the II-type reference signals configured according to the corresponding second parameters at the second time domain position to obtain equivalent channels, wherein the first parameter configuration is different from the second parameter configuration.

and based on the II-type codebook, carrying out quantitative estimation on the equivalent channel to obtain a code word selected based on the II-type codebook, and feeding back the code word selected based on the II-type codebook and the corresponding codebook type to the base station.

Wherein the method further comprises:

and receiving a service signal reflected after the node equipment adjusts the phase and/or amplitude based on configuration information during service transmission, wherein the configuration information is configured by the code word selected by the base station based on the II-type codebook and the corresponding codebook type.

The invention also provides an information transmission method, which is applied to the base station and comprises the following steps:

sending a class I reference signal and a class II reference signal, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook;

receiving a code word selected based on the I-type codebook and a corresponding codebook type;

a codeword selected based on a class II codebook and a corresponding codebook type are received.

the class II reference signal is one of a reference signal when node equipment exists and a reference signal when node equipment parameters are adjusted, and the node equipment has a function of reflecting signals or forwarding the reflected signals.

Wherein, sending the type II reference signal comprises:

sending a II-type reference signal under the condition of meeting a preset condition;

wherein the preset condition comprises one of the following conditions:

determining that the distance between the terminal and the node equipment is within a preset range based on uplink measurement information and channel state information and/or position related information reported by the terminal, wherein the position related information comprises geographical position information and/or a receiving angle;

receiving a first request sent by a terminal, wherein the first request is used for requesting the base station to send a class II reference signal.

Wherein the method further comprises:

sending a class II reference signal configuration parameter and a class II codebook corresponding to the class II reference signal to a terminal;

sending a type II reference signal configuration parameter and phase and/or amplitude configuration information of the node equipment to the node equipment;

the class II reference signal configuration parameters include: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the method further comprises:

obtaining a channel matrix according to the code word selected based on the II-type codebook and the corresponding codebook type;

performing precoding processing according to the channel matrix to obtain a first result;

based on the first result, configuring corresponding phase and/or amplitude configuration information during service transmission and transmission resources corresponding to the phase and/or amplitude configuration information for node equipment;

and sending a service signal, wherein the service signal is reflected on the transmission resource by the node equipment by using the phase and/or amplitude configuration information.

The invention also provides an information transmission method, which is applied to node equipment, wherein the node equipment has the function of reflecting signals or forwarding the reflected signals, and the method comprises the following steps:

receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter including: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the method further comprises:

and reporting the available phase to the base station.

Wherein the method further comprises:

acquiring corresponding phase and/or amplitude configuration information and transmission resources corresponding to the phase and/or amplitude configuration information during service transmission, wherein the phase and/or amplitude configuration information is configured by a code word selected by a base station based on a class II code book and a corresponding code book type, and the class II code book corresponds to a class II reference signal.

Wherein the method further comprises:

and on the transmission resource corresponding to the phase and/or amplitude configuration information, reflecting the traffic signal from the base station after adjusting the phase based on the phase and/or amplitude configuration information.

The present invention also provides a channel feedback device, including:

the first receiving module is used for receiving a class I reference signal and a class II reference signal, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook;

the first feedback module is used for feeding back the code word selected based on the I-type codebook and the corresponding codebook type based on the I-type reference signal;

and the second feedback module is used for feeding back the code word selected based on the class II codebook and the corresponding codebook type based on the class II reference signal.

Wherein, the channel feedback device further comprises:

a second receiving module, configured to receive the configuration information of the class II reference signal and a class II codebook corresponding to the class II reference signal.

Wherein, the channel feedback device further comprises:

a first obtaining module, configured to obtain channel state information and/or location related information of a terminal, where the channel state information is obtained from the class I reference signal, and the location related information includes geographical location information and/or a receiving angle;

a first sending module, configured to report target information to a base station, so that the base station sends a class II reference signal when determining that a distance between the terminal and a node device is within a preset range according to the target information and uplink measurement information; or, when it is determined that the distance between the terminal and the node device is within a preset range according to the target information, sending a first request to the base station, where the first request is used to request the base station to send a class II reference signal, and the target information includes the channel state information and/or the location related information.

Wherein the second feedback module comprises:

a first obtaining unit, configured to obtain a class II reference signal configuration parameter, where the class II reference signal configuration parameter includes: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the second feedback module further comprises:

a first calculating unit, configured to subtract, based on the class II reference signal configuration parameter, a channel estimated according to a class II reference signal corresponding to the first parameter configuration at a first time domain position from a channel estimated according to a class II reference signal corresponding to the second parameter configuration at a second time domain position, so as to obtain an equivalent channel, where the first parameter configuration is different from the second parameter configuration.

Wherein the second feedback module further comprises:

and the channel estimation unit is used for carrying out quantitative estimation on the equivalent channel based on the II-type codebook to obtain a code word selected based on the II-type codebook, and feeding back the code word selected based on the II-type codebook and the corresponding codebook type to the base station.

Wherein, the channel feedback device further comprises:

and a third receiving module, configured to receive a service signal reflected after a node device adjusts a phase and/or an amplitude based on configuration information during service transmission, where the configuration information is configured by the base station based on a codeword selected by the class II codebook and a corresponding codebook type.

The invention also provides a terminal, comprising a processor and a transceiver, wherein the processor is used for executing the following processes:

receiving, by the transceiver, a class I reference signal and a class II reference signal, the class I reference signal corresponding to a class I codebook and the class II reference signal corresponding to a class II codebook;

feeding back the code word selected based on the II type codebook and the corresponding codebook type based on the II type reference signal.

Wherein the transceiver is further configured to:

Wherein the processor is further configured to:

reporting target information to a base station through the transceiver so that the base station sends a class II reference signal under the condition that the distance between the terminal and the node equipment is determined to be within a preset range according to the target information and the uplink measurement information; or, when it is determined that the distance between the terminal and the node device is within a preset range according to the target information, sending a first request to the base station, where the first request is used to request the base station to send a class II reference signal, and the target information includes the channel state information and/or the location related information.

Wherein the processor is further configured to:

obtaining configuration parameters of a class II reference signal, wherein the configuration parameters of the class II reference signal include: and adjusting the parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the processor is further configured to:

and based on the configuration parameters of the II-type reference signals, subtracting the channel estimated by the II-type reference signals configured according to the corresponding first parameters at the first time domain position from the channel estimated by the II-type reference signals configured according to the corresponding second parameters at the second time domain position to obtain equivalent channels, wherein the first parameter configuration is different from the second parameter configuration.

Wherein the processor is further configured to:

and based on the II type codebook, carrying out quantitative estimation on the equivalent channel to obtain a code word selected based on the II type codebook, and feeding back the code word selected based on the II type codebook and the corresponding codebook type to the base station.

Wherein the transceiver is further configured to:

The invention also provides a terminal, which comprises a memory, a processor and a program which is stored on the memory and can be run on the processor; the processor, when executing the program, implements the channel feedback method as described above.

The present invention also provides a channel transmission apparatus, comprising:

a second sending module, configured to send a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

a fourth receiving module, configured to receive a codeword selected based on a class I codebook and a corresponding codebook type;

and a fifth receiving module, configured to receive the codeword selected based on the class II codebook and the corresponding codebook type.

Wherein, the second sending module may include:

the first sending unit is used for sending a class II reference signal under the condition that a preset condition is met;

wherein the preset condition comprises one of the following conditions:

Wherein the information transmission apparatus further comprises:

a third sending module, configured to send a class II reference signal configuration parameter and a class II codebook corresponding to the class II reference signal to a terminal;

a fourth sending module, configured to send a class II reference signal configuration parameter and phase and/or amplitude configuration information of the node device to the node device;

Wherein the information transmission apparatus further comprises:

the first processing module is used for obtaining a channel matrix according to the code word selected based on the II-type codebook and the corresponding codebook type;

a second processing module, configured to perform precoding processing according to the channel matrix to obtain a first result;

a configuration module, configured to configure, for the node device, phase and/or amplitude configuration information corresponding to service transmission and a transmission resource corresponding to the phase and/or amplitude configuration information based on the first result;

a fifth sending module, configured to send a service signal, where the service signal is reflected by the node device on the transmission resource by using the phase and/or amplitude configuration information.

The present invention also provides a base station comprising a processor and a transceiver, the transceiver receiving and transmitting data under control of the processor, the processor being configured to:

transmitting a class I reference signal and a class II reference signal through the transceiver, wherein the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

Wherein the transceiver is further configured to:

transmitting a class II reference signal under the condition of meeting a preset condition;

wherein the preset condition comprises one of the following conditions:

Wherein the transceiver is further configured to:

Wherein the processor is further configured to:

configuring corresponding phase and/or amplitude configuration information and transmission resources corresponding to the phase and/or amplitude configuration information when the service is transmitted for the node equipment based on the first result;

transmitting, by the transceiver, a traffic signal, the traffic signal being reflected on the transmission resource by the node device using the phase and/or amplitude configuration information.

The invention also provides a base station, which comprises a memory, a processor and a program which is stored on the memory and can be run on the processor; the processor implements the information transmission method as described above when executing the program.

The present invention also provides an information transmission apparatus, comprising:

a sixth receiving module, configured to receive a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, where the class II reference signal configuration parameter includes: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the information transmission apparatus further comprises:

and a sixth sending module, configured to report an available phase to the base station.

Wherein the information transmission apparatus further comprises:

a second obtaining module, configured to obtain phase and/or amplitude configuration information corresponding to service transmission and a transmission resource corresponding to the phase and/or amplitude configuration information, where the phase and/or amplitude configuration information is configured by a codeword selected by a base station based on a class II codebook and a corresponding codebook type, and the class II codebook corresponds to a class II reference signal.

Wherein the information transmission apparatus further comprises:

and a first reflection module, configured to reflect the traffic signal from the base station after adjusting the phase based on the phase and/or amplitude configuration information on a transmission resource corresponding to the phase and/or amplitude configuration information.

The invention also provides a node device, which has a function of reflecting signals or forwarding reflected signals, and comprises a processor and a transceiver, wherein the processor is used for executing the following processes:

receiving, by the transceiver, a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter comprising: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Wherein the transceiver is further configured to:

and reporting the available phase to the base station.

Wherein the processor is further configured to:

The invention also provides node equipment, which comprises a memory, a processor and a program which is stored on the memory and can run on the processor; the processor implements the information transmission method as described above when executing the program.

The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the channel feedback method as described above, or the steps of the information transmission method as described above.

The technical scheme of the invention at least has the following beneficial effects:

in the embodiment of the invention, a class I reference signal and a class II reference signal are received, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook; feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal; based on the II-type reference signal, the code word selected based on the II-type codebook and the corresponding codebook type are fed back, so that channel estimation and feedback of the reflection channel can be realized by introducing the II-type reference signal, thereby accurately reflecting the characteristics of the reflection channel, enabling the base station to acquire accurate channel information, and providing an accurate basis for precoding calculation when the subsequent base station side carries out beamforming.

Drawings

FIG. 1 shows a schematic diagram of a transmission model of an intelligent reflective surface;

fig. 2 is a flow chart of a channel feedback method according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a channel information acquiring method according to an embodiment of the present invention;

FIG. 4 is a flow chart of a signal reflection method according to an embodiment of the present invention;

fig. 5 is a schematic view showing the interaction of the processes among the terminal, the reflector and the base station according to the embodiment of the present invention;

FIG. 6 is a schematic diagram of a time domain pattern of a class II reference signal;

fig. 7 is a block diagram of a channel feedback apparatus according to an embodiment of the present invention;

fig. 8 is a block diagram of a channel information acquiring apparatus according to an embodiment of the present invention;

FIG. 9 is a block diagram of a signal reflection apparatus according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 12 is a schematic structural view of a reflector according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.

The invention provides a channel feedback method, a channel information acquisition method, a signal reflection method and a device, aiming at the problem that a terminal in the prior art cannot perform channel estimation and feedback on a reflection channel.

In order to better understand the method of the embodiment of the present invention, those skilled in the art will first perform the following description. Fig. 1 is a schematic diagram of an intelligent reflective surface transmission model. The signal is reflected by the reflecting plate 1 and then is directly transmitted to the link h_dOverlapping at the terminal side to form an equivalent channel。

The m-th array of the reflecting plate has the reflection coefficient of

Wherein M is the number of reflector arrays, gamma_mTo the reflection amplitude, θ_mIs a phase shift.

The received signal of a single antenna terminal may be expressed as:

wherein, the specific form of the equivalent channel in the brackets is as follows:

it should be noted that, in the following description,

a channel matrix representing a direct link between the kth terminal and the base station; x can be a known reference signal or a signal transmitted by an unknown base station;

representing a channel matrix between the kth terminal and the reflector plate; f denotes a channel matrix between the base station and the reflection plate.

The received signal of the multi-antenna terminal may be expressed as:

since the reflecting plate is not provided with a general reflecting plateRF link, therefore, when forwarding signal, terminal can only obtain one cascade equivalent channel

Or H_k+G_kΓ F, however, in beamforming, the base station needs to acquire channel information to perform precoding calculation. Unlike the conventional relay, the reflector cannot actively transmit signals for channel estimation, so how to obtain G and F in equivalent channels is an important problem to be solved in reflector communication.

Because the phases of the array elements on the reflecting plate can be adjusted, the simplest channel estimation method in the prior art is that the phases of the reflecting plate are adjusted for multiple times, and the terminal receives equivalent channels twice

Or H_k+G_kAnd F, subtracting the difference and then carrying out channel estimation. Here, it is assumed that the channel is slowly changed during the transmission of the reference signal, so that the subtraction results in a concatenated channel

Or

Since the phase is known, a concatenated channel can be obtained

Or

If transmission is performed according to the communication flow of the existing base station and terminal (the base station sends a reference signal, the terminal estimates a channel, the terminal performs channel feedback, and the base station performs precoding calculation and scheduling), in the process, the reflector plate needs to perform multiple phase adjustments for the terminal to perform multiple channel estimations, the phase control of the reflector plate should be consistent with the sending format of the reference signal, a scheme for phase control of the reflector plate does not exist at present, and the relationship between the phase control scheme and the reference signal is not designed.

In addition to the lack of the above-mentioned phase control scheme, if the terminal can feed back only every time according to the existing procedure, the terminal can feed back

Or H_k+G_kAn estimate of Γ F. In existing systems, the terminal estimates only this channel from the base station to the terminal

Or H_kEven in a relay/access backhaul Integrated (IAB) system, the terminal estimates a separate relay-terminal channel F. In the intelligent reflective surface system, only the channel of the signal after surface reflection can be estimated by the terminal, and the channel characteristics and the structure of the channel are greatly different from those of a common transmitting node-receiving node channel. Therefore, if the terminal performs the feedback after performing the quantization estimation on the equivalent channel according to the current codebook format, it is difficult to accurately reflect the characteristics of the reflective link channel.

Based on this, as shown in fig. 2, an embodiment of the present invention provides a channel feedback method, where the method is applied to a terminal, and the method includes:

step 201, receiving a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook.

Here, optionally, the class I reference signal is one of a reference signal when no node device exists and a reference signal when a node device parameter is not adjusted;

Here, the node device may be a reflection plate.

Here, the class II reference signal is used for channel estimation in the baffle communication system.

It should be noted that the class II Reference Signal may be a Channel State Information-Reference Signal (CSI-RS), where the CSI-RS is used as the class II Reference Signal and is used for Channel estimation in the reflective plate communication system.

It should be noted that the class II codebook corresponding to the class II reference signal is a codebook matching a reflection channel.

Step 202, based on the class I reference signal, feeding back a codeword selected based on a class I codebook and a corresponding codebook type;

it should be noted that the class I reference signal may include a synchronization signal, a CSI-RS, and the like.

Step 203, feeding back the code word selected based on the class II codebook and the corresponding codebook type based on the class II reference signal.

According to the channel feedback method, a class I reference signal and a class II reference signal are received, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook; feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal; based on the II-type reference signal, the code word selected based on the II-type codebook and the corresponding codebook type are fed back, so that channel estimation and feedback of the reflection channel can be realized by introducing the II-type reference signal, thereby accurately reflecting the characteristics of the reflection channel, enabling the base station to acquire accurate channel information, and providing an accurate basis for precoding calculation when the subsequent base station side carries out beamforming.

As an optional implementation manner, the method according to the embodiment of the present invention may further include:

Here, the configuration information of the class II reference signal includes at least, but is not limited to: the transmission resource (e.g., the time-frequency position corresponding to the transmission of the class II reference signal) for transmitting the class II reference signal, the correspondence between the class II reference signal and the transmission resource, and the reference signals on which symbols correspond to the same parameter.

It should be noted that the configuration information of the class II reference signal and the class II codebook corresponding to the class II reference signal are configured by the base station. Specifically, the terminal receives the configuration information of the class II reference signal sent by the base station, and receives the class II reference signal sent by the base station and reflected by the reflector through the configuration information.

Optionally, the phase and/or amplitude of the node device is configured by a base station or determined by the node device.

Specifically, the phase and/or amplitude of the reflector is configured by the base station or determined by the reflector.

It should be noted that the class II reference signal is reflected by the node device at the phase of the node device. Here, the number of phases of the node device is greater than or equal to 2.

As an optional implementation manner, the method in the embodiment of the present invention may further include:

in this step, specifically, the terminal performs channel measurement according to the class I reference signal to obtain channel state information of the terminal.

Here, the location-related information may be obtained by the terminal by using existing information, or may be obtained by the base station based on signal state information reported by the terminal, measurement information of the base station, and deployment information.

Here, the terminal may report target information to the base station, and the base station determines whether the terminal is located near a node device (e.g., a reflection plate) according to the target information and the uplink measurement information; if yes, the base station is required to send a class II reference signal for reflecting channel estimation; otherwise, no processing is performed.

Alternatively, the terminal may determine itself whether it is located near the node device (such as a reflection plate) according to the obtained target information; if yes, triggering the base station to send a II-type reference signal for reflecting channel estimation; otherwise, no processing is performed.

Here, if the target information is geographical location information, the base station may determine whether the terminal is located near the node device based on a comparison between the geographical location of the terminal reported by the terminal and a location of the node device (e.g., a reflector).

If the target information is a receiving angle, the base station compares the receiving angle of the class I reference signal reported by the terminal with the position of the node device (such as a reflecting plate), and can know the position of the terminal relative to the node device, so as to determine whether the terminal is located near the node device.

If the target information is channel state information, the base station can obtain the possible position of the terminal by combining the positions of the existing base station and node equipment (such as a reflecting plate) based on the channel strength reported by the terminal, and can judge whether the terminal is positioned near the node equipment.

As an alternative implementation, step 203 of the method according to the embodiment of the present invention may include:

obtaining a class II reference signal configuration parameter, wherein the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times, and corresponding different time domain positions of different parameters.

Here, the parameters involved in the class II reference signal configuration parameters in this step are specifically referred to as phases. Specifically, the phase configured each time may be a phase corresponding to one time domain position, or multiple phases corresponding to one time domain position. The phase of the configuration may be represented in vector form.

Further, step 203 of the method according to the embodiment of the present invention may further include:

and based on the II-type reference signal configuration parameters, subtracting the channel estimated by the II-type reference signal configured according to the corresponding first parameter at the first time domain position from the channel estimated by the II-type reference signal configured according to the corresponding second parameter at the second time domain position to obtain an equivalent channel, wherein the first parameter configuration is different from the second parameter configuration.

In one example, the phase of the reflector is adjusted at multiple RS transmission positions, and the terminal/base station may obtain an estimated value of an equivalent channel at the i-th adjustment, that is:

H_k+G_kΓF＝A_i

subtracting the two equivalent channels to obtain:

it can be seen that this process removes the effect of the direct-view path, resulting in a channel estimate for the purely reflective link.

In this step, since the characteristics of the reflective link are different from those of the direct link, when performing feedback, a class II codebook is selected according to the configuration of the base station for feedback, and the channel feedback information includes a codeword (for example, a precoding matrix index PMI) selected based on the class II codebook and a corresponding codebook type, so as to enable the base station to distinguish which type of codebook the currently fed codeword is based on for feedback.

Here, since the channel feedback information takes into account the characteristics of the channel of the reflection link, the configuration information configured by the base station based on the channel feedback information is more accurate with respect to the phase and/or amplitude of the node device, and the reflected traffic signal after adjusting the phase and/or amplitude using the configuration information can enhance the signal strength, reduce the interference between users, and improve the system capacity.

As shown in fig. 3, an embodiment of the present invention further provides an information transmission method, where the method is applied to a base station, and includes:

step 301, sending a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

Here, the node device may be a reflection plate.

Here, the class II reference signal is used for channel estimation in the reflector communication system.

Here, the class I reference signal is transmitted to the terminal, and the purpose is to enable the terminal to perform channel measurement based on the class I reference signal, report channel state information, thereby determining whether the terminal is located near the node device, and transmit the class II reference signal when the terminal is located near the node device.

As an optional implementation, the sending the class II reference signal includes:

wherein the preset condition comprises one of the following conditions:

Here, the specific implementation step of determining that the distance between the terminal and the node device (such as a reflection plate) is within the preset range based on the channel state information and/or the position-related information reported by the terminal is already described in the embodiment of the method at the terminal side, and is not described here again.

Step 302, receiving a codeword selected based on a class I codebook and a corresponding codebook type;

Here, specifically, the code word selected based on the class I codebook and the corresponding codebook type fed back by the terminal are received.

Step 303, receiving a codeword selected based on a class II codebook and a corresponding codebook type.

Here, specifically, a codeword selected based on a class II codebook and a corresponding codebook type fed back by the terminal are received.

According to the information transmission method, the type I reference signal and the type II reference signal are sent, the type I reference signal corresponds to the type I codebook, and the type II reference signal corresponds to the type II codebook; receiving a code word selected based on the I-type codebook and a corresponding codebook type; and receiving the code word selected based on the II-type codebook and the corresponding codebook type, thus, the code word selected based on the II-type codebook and the corresponding codebook type which can accurately reflect the channel characteristics are fed back by the terminal, and based on the code word, the base station can acquire accurate channel information, thereby providing an accurate basis for the subsequent precoding calculation during beamforming.

As an optional implementation, the method further includes:

it should be noted that the class II reference signal configuration parameter and the class II codebook are configured by the base station. Here, the base station may transmit the class II reference signal based on the class II reference signal configuration parameter.

Sending a class II reference signal configuration parameter and the node device phase and/or amplitude configuration information to a node device, the class II reference signal configuration parameter including: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Here, the class II reference signal configuration parameter is associated with node device phase and/or amplitude configuration information, and the node device phase and/or amplitude configuration information is sent to the node device, and the purpose is to instruct the node device to perform corresponding phase adjustment, so that the terminal makes appropriate channel estimation and feedback.

in an example, considering that the position of the node device (such as a reflecting plate) is relatively fixed, the deployment position of the node device is more prone to be selected at a position having a direct sight with the base station, and therefore, a channel between the base station and the node device is a deterministic known channel and can be approximately considered as invariant (the channel from the node device to the base station can be obtained through uplink and downlink reciprocity at the initial stage of deployment). In addition, the channel between the node equipment and the base station can be solved by some approximate methods. In the channel estimation process, the phase of the node equipment can be adjusted for a plurality of times, so that the matrix is considered to be

Is a known matrix. The matrix F (channel matrix between the reflector plate and the base station) is also assumed to be a known matrix.

Thus, the base station end aims to obtain

Or G_kCan be calculated using the following equation:

wherein the content of the first and second substances,

N_Tnumber of base station end antennaMatrix of

To select any M- (N-1) N in the matrix F_TAnd (5) forming a matrix by columns. Thus, a coefficient matrix of a full rank square matrix can be constructed

The matrix can be solved according to zero-breaking ZF criterion and minimum mean square error MMSE criterion

Or G_k。

According to the above equation, it is only necessary to be able to pass a sufficient number of times: (

Sub) to obtain a coefficient matrix of sufficient dimensions, the above equation can be used to solve

Or G_k. Compared with the prior method which needs M +1 times of training, the method can reduce the training time

And secondary training, thereby reducing reference signal overhead. E.g. M100, N_TAt 64, the reference signal overhead can be reduced by 98%.

sending a traffic signal, said traffic signal being reflected by said node device on said transmission resource using said phase and/or amplitude configuration information.

As shown in fig. 4, an embodiment of the present invention further provides an information transmission method, where the method is applied to a node device, where the node device has a function of reflecting a signal or forwarding a reflected signal, and the method includes:

step 401, receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, where the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times, and corresponding different time domain positions of different parameters.

Here, the class II reference signal configuration parameters and the node device phase and/or amplitude configuration information are configured by the base station. It should be noted that the phase and/or amplitude may be configured by the base station, or may be reported by the terminal.

Specifically, a class II reference signal configuration parameter and node device phase and/or amplitude configuration information sent by a base station are received.

In the information transmission method of the embodiment of the present invention, by receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times and different time domain positions corresponding to different parameters, so that the node equipment can be indicated to perform corresponding adjustment, and the terminal can perform appropriate channel estimation and feedback.

As an optional implementation manner, the method further includes:

and reporting the available phase to the base station.

Here, the node device reports the available phase to the base station, and the purpose of the node device is to facilitate the base station to configure the node device phase and/or amplitude configuration information based on the phase reported by the node device. Specifically, the phase included in the node device phase and/or amplitude configuration information is taken from an available phase reported by the node device.

and acquiring corresponding phase and/or amplitude configuration information during service transmission and transmission resources corresponding to the phase and/or amplitude configuration information.

Further, the method of the embodiment of the present invention may further include:

and reflecting the traffic signal from the base station after adjusting the phase based on the phase and/or amplitude configuration information on the transmission resource corresponding to the phase and/or amplitude configuration information.

It should be noted that, because the node device reflects the class II reference signal, and after the node device receives the class II reference signal, the channel estimation is performed based on the class II reference signal to obtain the codeword selected based on the class II codebook and the corresponding codebook type, where the codeword selected based on the class II codebook and the corresponding codebook type take into account characteristics of a reflected link channel, here, the base station configures information for a corresponding phase and/or amplitude during service transmission configured for the node device based on the codeword selected based on the class II codebook and the corresponding codebook type, so that the phase and/or amplitude configuration of the node device is more accurate, and the reflected service signal after adjusting the phase using the phase and/or amplitude configuration information can reduce interference between users and improve system capacity.

In the information transmission method of the embodiment of the present invention, by receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times and different time domain positions corresponding to different parameters, so that the node equipment can be instructed to perform corresponding adjustment, and the terminal can perform appropriate channel estimation and feedback.

The following describes the implementation process of the method of the present invention in terms of flow interaction among the terminal, the reflector and the base station based on the reflector communication system.

As shown in fig. 5, the specific interaction flow is as follows:

s1: a terminal receives a class I reference signal sent by a base station;

s2: a terminal reports target information to a base station, wherein the target information comprises channel state information and/or position related information;

here, after receiving the class I reference signal transmitted by the base station, the terminal performs channel measurement to obtain channel state information.

Alternatively, S3: the terminal triggers the base station to send the configuration information of the II-type reference signal under the condition that the terminal determines that the terminal is positioned near the reflecting plate based on the target information;

s4: the base station sends the configuration information of the II-type reference signal and a II-type codebook to the terminal;

it should be noted that, when the base station determines that it is located near the reflection plate based on the target information reported by the terminal, the base station sends the configuration information of the class II reference signal.

S5: the base station sends the configuration information of the II-type reference signal and the phase information of the reflector to the reflector;

s6: and the base station sends a II-type reference signal, and the reflector adjusts the phase reflection signal at the corresponding RS sending position based on the configuration information of the II-type reference signal and the phase information of the reflector.

Specifically, as shown in fig. 6, the reflector obtains a time domain pattern of a class II reference signal configured by the base station from the base station, and adjusts phases of the reflector at different time domain positions, so that the terminal can receive the class II reference signal reflected by different phases.

S7: the terminal carries out channel estimation of a reflection link based on the II-type reference signal and selects a II-type codebook for feedback;

since the characteristics of the reflective link are different from those of the direct transmission link, the type II codebook is selected for feedback according to the configuration of the base station when feedback is performed, and it should be distinguished in the feedback information which type of codebook is based on the PMI currently fed back.

S8: the base station configures phase configuration information when the reflector plate actually transmits;

it should be noted that, the base station calculates the channel matrix based on the feedback of the terminal; and performing precoding calculation based on the channel matrix to obtain a first result, and configuring phase configuration information of the reflector during actual transmission based on the first result, and configuring transmission resource information corresponding to the phase configuration information to the reflector.

S9: the base station transmits service;

s10: the reflector plate reflects the traffic signal on the corresponding transmission resource using the phase in the phase configuration information.

As shown in fig. 7, an embodiment of the present invention further provides a channel feedback apparatus, where the apparatus is applied to a terminal, and the apparatus includes:

a first receiving module 701, configured to receive a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

a first feedback module 702, configured to feedback, based on the class I reference signal, a codeword selected based on a class I codebook and a corresponding codebook type;

a second feedback module 703, configured to feedback, based on the class II reference signal, a codeword selected based on a class II codebook and a corresponding codebook type.

Optionally, the class I reference signal is one of a reference signal without a node device and a reference signal without an adjusted node device parameter;

Optionally, the channel feedback apparatus further includes:

a second receiving module, configured to receive configuration information of the class II reference signal and a class II codebook corresponding to the class II reference signal.

Optionally, the channel feedback apparatus further includes:

Optionally, the second feedback module 703 includes:

Optionally, the second feedback module 703 further includes:

Optionally, the channel feedback apparatus further includes:

The channel feedback device of the embodiment of the invention receives a class I reference signal and a class II reference signal, wherein the class I reference signal corresponds to a class I codebook, and the class II reference signal corresponds to a class II codebook; feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal; based on the II-type reference signal, the code word selected based on the II-type codebook and the corresponding codebook type are fed back, so that channel estimation and feedback of the reflection channel can be realized by introducing the II-type reference signal, thereby accurately reflecting the characteristics of the reflection channel, enabling the base station to acquire accurate channel information, and providing an accurate basis for precoding calculation when the subsequent base station side carries out beamforming.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the terminal-side method embodiment, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

As shown in fig. 8, an embodiment of the present invention further provides an information transmission apparatus, where the apparatus is applied to a base station, and the apparatus includes:

a second sending module 801, configured to send a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

a fourth receiving module 802, configured to receive a codeword selected based on a class I codebook and a corresponding codebook type;

a fifth receiving module 803, configured to receive the codeword selected based on the class II codebook and the corresponding codebook type.

Optionally, the second sending module 801 may include:

wherein the preset condition comprises one of the following conditions:

Optionally, the information transmission apparatus further includes:

the class II reference signal configuration parameters include: and adjusting the parameters for multiple times, and corresponding different time domain positions of different parameters.

Optionally, the information transmission apparatus further includes:

the first processing module is used for obtaining a channel matrix according to the code words selected based on the II-type codebook and the corresponding codebook types;

a fifth sending module, configured to send a service signal, where the service signal is reflected on the transmission resource by the node device using the phase and/or amplitude configuration information.

According to the information transmission device, the type I reference signal and the type II reference signal are sent, the type I reference signal corresponds to the type I codebook, and the type II reference signal corresponds to the type II codebook; receiving a code word selected based on the I-type codebook and a corresponding codebook type; and receiving the code word selected based on the II-type codebook and the corresponding codebook type, thus, the code word selected based on the II-type codebook and the corresponding codebook type which can accurately reflect the channel characteristics are fed back by the terminal, and based on the code word, the base station can acquire accurate channel information, thereby providing an accurate basis for the subsequent precoding calculation during beamforming.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment on the base station side, and can achieve the same technical effect, and details of the same parts and beneficial effects as those of the method embodiment in this embodiment are not described herein again.

As shown in fig. 9, an embodiment of the present invention further provides an information transmission apparatus, where the apparatus is applied to a node device, where the node device has a function of reflecting a signal or forwarding a reflected signal, and the apparatus includes:

a sixth receiving module 901, configured to receive a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, where the class II reference signal configuration parameter includes: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Optionally, the information transmission apparatus further includes:

and a first reflection module, configured to reflect the traffic signal from the base station after adjusting the phase based on the phase and/or amplitude configuration information on the transmission resource corresponding to the phase and/or amplitude configuration information.

In the information transmission apparatus according to the embodiment of the present invention, by receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times and different time domain positions corresponding to different parameters, so that the node equipment can be indicated to perform corresponding adjustment, and the terminal can perform appropriate channel estimation and feedback.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the reflector side method embodiment, and can achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are not repeated herein.

In order to better achieve the above object, as shown in fig. 10, an embodiment of the present invention further provides a terminal, which includes a processor 1000 and a transceiver 1010, and the terminal further includes a user interface 1020, where the processor 1000 is configured to perform the following processes:

receiving, by the transceiver 1010, a class I reference signal and a class II reference signal, the class I reference signal corresponding to a class I codebook and the class II reference signal corresponding to a class II codebook;

Optionally, the transceiver 1010 is further configured to:

Optionally, the processor 1000 is further configured to:

reporting target information to a base station through the transceiver 1010, so that the base station sends a class II reference signal when determining that the distance between the terminal and the node device is within a preset range according to the target information and the uplink measurement information; or, when it is determined that the distance between the terminal and the node device is within a preset range according to the target information, sending a first request to the base station, where the first request is used to request the base station to send a class II reference signal, and the target information includes the channel state information and/or the location related information.

Optionally, the processor 1000 is further configured to:

Based on the II-type reference signal configuration parameters, subtracting a channel estimated by the II-type reference signal configured according to the corresponding first parameter at a first time domain position from a channel estimated by the II-type reference signal configured according to the corresponding second parameter at a second time domain position to obtain an equivalent channel, wherein the first parameter configuration is different from the second parameter configuration;

Optionally, the transceiver 1010 is further configured to:

According to the terminal provided by the embodiment of the invention, the I-type reference signal and the II-type reference signal are received, wherein the I-type reference signal corresponds to an I-type codebook, and the II-type reference signal corresponds to an II-type codebook; feeding back a code word selected based on the I-type codebook and a corresponding codebook type based on the I-type reference signal; based on the II-type reference signal, the code word selected based on the II-type codebook and the corresponding codebook type are fed back, so that channel estimation and feedback of the reflection channel can be realized by introducing the II-type reference signal, thereby accurately reflecting the characteristics of the reflection channel, enabling the base station to acquire accurate channel information, and providing an accurate basis for precoding calculation when the subsequent base station side carries out beamforming.

The embodiment of the invention also provides a terminal, which comprises a memory, a processor and a program which is stored on the memory and can be operated on the processor; when the processor executes the program, the processes in the channel feedback method embodiment described above are implemented, and the same technical effect can be achieved, and for avoiding repetition, details are not described here again.

In order to better achieve the above object, as shown in fig. 11, an embodiment of the present invention further provides a base station, including a processor 1100 and a transceiver 1110, where the transceiver 1110 receives and transmits data under the control of the processor 1100, and the processor 1100 is configured to perform the following processes:

sending, by the transceiver 1110, a class I reference signal and a class II reference signal, where the class I reference signal corresponds to a class I codebook and the class II reference signal corresponds to a class II codebook;

Optionally, the transceiver 1110 is further configured to:

wherein the preset condition comprises one of the following conditions:

Optionally, the transceiver 1110 is further configured to:

Optionally, the processor 1100 is further configured to:

In the base station of the embodiment of the invention, the I-type reference signal and the II-type reference signal are sent, wherein the I-type reference signal corresponds to the I-type codebook, and the II-type reference signal corresponds to the II-type codebook; receiving a code word selected based on the I-type codebook and a corresponding codebook type; and receiving the code word selected based on the II-type codebook and the corresponding codebook type, thus the code word selected based on the II-type codebook and the corresponding codebook type which can accurately reflect the channel characteristics are fed back by the terminal, and based on the code word selected based on the II-type codebook and the corresponding codebook type, the base station can acquire accurate channel information, thereby providing an accurate basis for the subsequent precoding calculation during beamforming.

The base station comprises a memory, a processor and a program which is stored on the memory and can be run on the processor; the method is characterized in that the processor implements each process in the above-described information transmission method embodiment when executing the program, and can achieve the same technical effect, and for avoiding repetition, the details are not repeated here.

In order to better achieve the above object, as shown in fig. 12, an embodiment of the present invention further provides a node device, where the node device has a function of reflecting signals or forwarding reflected signals, and includes a processor 1200 and a transceiver 1210, where the processor 1200 is configured to perform the following processes:

receiving, by the transceiver 1210, a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, where the class II reference signal configuration parameter includes: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

Optionally, the transceiver 1210 is further configured to:

and reporting the available phase to the base station.

Optionally, the processor 1200 is further configured to:

acquiring corresponding phase and/or amplitude configuration information and transmission resources corresponding to the phase and/or amplitude configuration information during service transmission, wherein the phase and/or amplitude configuration information is configured by a code word selected by a base station based on a class II code book and a corresponding code book type, and the class II code book corresponds to a class II reference signal;

In the node device of the embodiment of the present invention, by receiving a class II reference signal configuration parameter and node device phase and/or amplitude configuration information, the class II reference signal configuration parameter includes: and adjusting the parameters for multiple times and different time domain positions corresponding to different parameters, so that the node equipment can be indicated to perform corresponding adjustment, and the terminal can perform appropriate channel estimation and feedback.

The embodiment of the invention also provides node equipment, which comprises a memory, a processor and a program which is stored on the memory and can be operated on the processor; when the processor executes the program, the processes in the above-described information transmission method embodiment are implemented, and the same technical effects can be achieved, and are not described herein again to avoid repetition.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements each process in the channel feedback method or the information transmission method, and can achieve the same technical effect, and in order to avoid repetition, the computer program is not described here again. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block or blocks.

These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A channel feedback method is applied to a terminal, and is characterized by comprising the following steps:

2. The method of claim 1, wherein the class I reference signal is one of a reference signal without a node device and a reference signal with node device parameters unadjusted;

3. The method of claim 1, further comprising:

4. The method according to claim 2, characterized in that the phase and/or amplitude of the node device is configured by a base station or decided by the node device.

5. The method of claim 1, further comprising:

acquiring channel state information and/or position related information of a terminal, wherein the channel state information is obtained by the I-type reference signal, and the position related information comprises geographical position information and/or a receiving angle;

reporting target information to a base station so that the base station sends a class II reference signal under the condition that the distance between the terminal and the node equipment is determined to be within a preset range according to the target information and uplink measurement information; or, when it is determined that the distance between the terminal and the node device is within a preset range according to the target information, sending a first request to the base station, where the first request is used to request the base station to send a class II reference signal, and the target information includes the channel state information and/or the location related information.

6. The method of claim 1, wherein the feeding back the selected codeword based on the class II codebook and the corresponding codebook type based on the class II reference signal comprises:

obtaining configuration parameters of a class II reference signal, wherein the configuration parameters of the class II reference signal include: and adjusting parameters for multiple times, and corresponding different time domain positions of different parameters.

7. The method of claim 1 or 6, wherein the feeding back the selected codeword based on the class II codebook and the corresponding codebook type based on the class II reference signal further comprises

8. The method of claim 1, wherein the feeding back the selected codeword based on the class II codebook and the corresponding codebook type based on the class II reference signal further comprises:

9. The method of claim 1, further comprising:

10. An information transmission method applied to a base station, comprising:

11. The method of claim 10, wherein the class I reference signal is one of a reference signal without a node device and a reference signal with node device parameters unadjusted;

12. The method of claim 10, wherein transmitting a class II reference signal comprises:

wherein the preset condition comprises one of the following conditions:

13. The method of claim 10, further comprising:

14. The method of claim 10, further comprising:

15. An information transmission method applied to a node device, the node device having a function of reflecting a signal or forwarding a reflected signal, the method comprising:

16. The method of claim 15, further comprising:

and reporting the available phase to the base station.

17. The method of claim 15, further comprising:

18. The method of claim 17, further comprising:

19. A channel feedback apparatus, comprising:

20. A terminal comprising a processor and a transceiver, wherein the processor is configured to perform the following:

21. A terminal comprising a memory, a processor, and a program stored on the memory and executable on the processor; characterized in that the processor implements the channel feedback method according to any one of claims 1 to 9 when executing the program.

22. A channel transmission apparatus, comprising:

23. A base station comprising a processor and a transceiver, the transceiver receiving and transmitting data under control of the processor, characterized in that the processor is configured to:

24. A base station comprising a memory, a processor and a program stored on the memory and executable on the processor; characterized in that the processor, when executing the program, implements the information transmission method according to any one of claims 10 to 14.

25. An information transmission apparatus, comprising:

26. A node device having a function of reflecting or repeating a reflected signal, comprising a processor and a transceiver, wherein the processor is configured to perform the following process:

27. A node apparatus comprising a memory, a processor, and a program stored on the memory and executable on the processor; characterized in that the processor, when executing the program, implements the information transmission method according to any one of claims 15 to 18.

28. A computer readable storage medium, having stored thereon a computer program, characterized in that the program, when being executed by a processor, carries out the steps in the channel feedback method according to any one of claims 1 to 9, or the steps in the information transmission method according to any one of claims 10 to 14, or the steps in the information transmission method according to any one of claims 15 to 18.