CN109327251A - PMI-based processing method, device, related equipment and storage medium - Google Patents

Abstract

The invention discloses a kind of processing method, device, relevant device and storage mediums for being based on pre-coding matrix instruction (PMI).Wherein, method includes: to carry out channel measurement to subband and to base station feedback channel state information (CSI)；Wherein, when feeding back CSI, when the bandwidth corresponding part of the subband or whole control channel bandwidth, the PMI and the first information of feedback indicate the pre-coding matrix of the subband data channel and the precoding vector of the subband control channel；The data channel transmits data using multithread precoding mode.

Description

PMI-based processing method, device, related equipment and storage medium

technical field

The present invention relates to the field of wireless communication, and in particular, to a processing method, device, terminal, base station and computer-readable storage medium based on a Precoding Matrix Index (PMI, Precoding Matrix Index).

Background technique

In a Long Term Evolution (LTE, Long Term Evolution) system, the physical layer control channel adopts a fixed transmission diversity scheme, and the data channel can adopt multiple transmission modes, including transmission mode 1 to transmission mode 10. Among them, there are multiple closed-loop transmission modes in transmission mode 1 to transmission mode 10, such as transmission mode 4: closed-loop spatial multiplexing, transmission mode 5: MU-MIMO, transmission mode 6 single-layer closed-loop MIMO, etc. In these closed-loop transmission modes, the terminal needs to feed back channel state information (CSI, Channel State Information), and then the base station configures a corresponding transmission mode based on the feedback CSI.

In order to enhance the coverage of the downlink control channel, it is considered to adopt the transmission mode of single-layer beamforming in the new air interface of the fifth generation mobile communication technology (5G), which can effectively improve the coverage performance. In order to support a closed-loop single-layer precoding scheme, PMI information is also required for the control channel.

In order to support the closed-loop single-layer precoding scheme of the control channel, one solution is to directly use the PMI of the data channel of a certain subband as the PMI of the control channel of the corresponding subband. However, in this solution, if the terminal feeds back the indication of the multi-layer codeword, the PMI of the data channel cannot be directly used as the PMI of the control channel of one subband.

Therefore, how to realize the PMI feedback of the control channel when the control channel supports the closed-loop single-layer precoding scheme is an urgent problem to be solved at present.

SUMMARY OF THE INVENTION

To solve the existing technical problems, embodiments of the present invention provide a PMI-based processing method, device, terminal, base station, and computer-readable storage medium.

The technical solution of the embodiment of the present invention is realized as follows:

An embodiment of the present invention provides a PMI-based processing method, including:

Channel measurement is performed on the subbands and CSI is fed back to the base station; wherein,

When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data.

In the above solution, the way of feeding back the PMI and the first information includes one of the following:

Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel;

The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel.

In the above scheme, the method also includes:

Receive radio resource control (RRC) signaling or system information sent by the base station;

Parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information;

Correspondingly, the PMI and the first information are fed back according to the obtained manner.

In the above solution, when the PMI of the subband data channel is fed back, and the first information fed back is not empty, one of the following characteristics is satisfied:

the first information independently indicates the precoding vector of the subband control channel;

The first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel.

In the above solution, when the first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel, the PMI of the subband data channel indicates a codeword in a codebook; The first information indicates a precoding vector at a specific position in the codeword.

An embodiment of the present invention also provides a PMI-based processing method, including:

Receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth;

Parse the CSI to obtain PMI and first information; use the PMI and the first information to determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel; the subband data channel adopts Data is transmitted by multi-stream precoding.

In the above scheme, the manner of determining the precoding matrix of the subband data channel and the precoding vector of the subband control channel by using the PMI and the first information includes one of the following:

When the PMI is the PMI of the subband data channel and the first information is empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; The fixed position or random position vector in the precoding matrix corresponding to the PMI of the data channel is used as the precoding vector of the subband control channel;

When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel.

In the above solution, the method of determining the precoding vector of the subband control channel by using the first information includes one of the following methods:

independently determining a precoding vector for the subband control channel using the first information;

The precoding vector of the subband control channel is jointly determined using the first information and the PMI of the subband data channel.

In the above scheme, the precoding vector of the subband control channel is jointly determined by the first information and the PMI of the subband data channel, including:

Using the PMI of the subband data channel, determine a codeword in a codebook;

The precoding vector at a specific position in the codeword indicated by the first information is used as the precoding vector of the subband control channel.

In the above solution, before receiving the CSI of the subband fed back by the terminal, the method further includes:

The feedback mode of the PMI and the first information is indicated to the terminal through RRC signaling or system information.

In the above scheme, the method also includes:

When the subband data channel adopts the single-stream precoding mode to transmit data, the PMI of the subband data channel is directly used as the PMI of the subband control channel.

An embodiment of the present invention further provides a PMI-based processing device, including:

a measurement module, used to perform channel measurement on the subband;

a feedback module for feeding back the CSI to the base station; wherein,

When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data.

An embodiment of the present invention also provides a PMI-based processing device, including:

a receiving unit for receiving the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth;

a parsing unit, configured to parse the CSI to obtain the PMI and the first information;

a determining unit, configured to use the PMI and the first information to determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel; the subband data channel uses multi-stream precoding to transmit data .

An embodiment of the present invention further provides a terminal, including:

a first processor, configured to perform channel measurement on the subband;

a first communication interface for feeding back CSI to the base station; wherein,

When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data.

In the above solution, the manner in which the first communication interface feeds back the PMI and the first information includes one of the following:

Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel;

The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel.

In the above solution, the first communication interface is also used to receive radio resource control RRC signaling or system information sent by the base station;

The first processor is further configured to parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information;

Correspondingly, the first communication interface feeds back the PMI and the first information according to the obtained manner.

The embodiment of the present invention also provides a base station, including:

The second communication interface is used to receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth;

a second processor, configured to parse the CSI to obtain PMI and first information; determine a precoding matrix of the subband data channel and a precoding vector of the subband control channel by using the PMI and the first information; The subband data channel transmits data in a multi-stream precoding manner.

In the above solution, the second processor is specifically configured to perform one of the following operations:

When the PMI is the PMI of the subband data channel and the first information is empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; The fixed position or random position vector in the precoding matrix corresponding to the PMI of the data channel is used as the precoding vector of the subband control channel;

When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel.

In the above solution, the second processor is configured to perform one of the following operations:

independently determining a precoding vector for the subband control channel using the first information;

The precoding vector of the subband control channel is jointly determined using the first information and the PMI of the subband data channel.

In the above solution, the second processor is specifically used for:

Using the PMI of the subband data channel, determine a codeword in a codebook;

The precoding vector at a specific position in the codeword indicated by the first information is used as the precoding vector of the subband control channel.

In the above solution, the second communication interface is further configured to indicate the feedback mode of the PMI and the first information to the terminal through RRC signaling or system information before receiving the CSI of the subband fed back by the terminal.

In the above solution, the second processor is also used for:

When the subband data channel adopts the single-stream precoding mode to transmit data, the PMI of the subband data channel is directly used as the PMI of the subband control channel.

An embodiment of the present invention further provides a terminal, the terminal comprising: a first processor, a first memory, and a computer program stored on the first memory and capable of running on the first processor;

Wherein, the first processor is configured to execute the steps of any method on the terminal side when running the computer program.

An embodiment of the present invention also provides a base station, which is characterized by comprising: a second processor, a second memory, and a computer program stored on the second memory and capable of running on the second processor;

Wherein, the second processor is configured to execute the steps of any method on the base station side when running the computer program.

Embodiments of the present invention further provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of any method on the terminal side, or implements the steps of any method on the base station side.

In the PMI-based processing method, device, terminal, base station, and computer-readable storage medium provided by the embodiments of the present invention, when a data channel is transmitted in a multi-stream precoding manner, when feeding back CSI, the PMI and the first information are fed back, and the The fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel, which realizes the feedback of the PMI of the control channel, so that the single-stream precoding transmission mode of the control channel can be supported , so that the coverage performance of the downlink control channel can be effectively improved, and the reliability of control information transmission can be improved.

Description of drawings

In the drawings, which are not necessarily to scale, like reference numerals may describe like parts in different views. The accompanying drawings generally illustrate, by way of example and not limitation, the various embodiments discussed herein.

FIG. 1 is a schematic flowchart of a PMI-based processing method on a terminal side according to an embodiment of the present invention;

2 is a schematic diagram of a codebook corresponding to an antenna port in Embodiment 2 of the present invention;

3 is a schematic diagram of a codebook corresponding to an antenna port in Embodiment 4 of the present invention;

4 is a schematic flowchart of a PMI-based processing method at the base station side according to an embodiment of the present invention;

5 is a schematic flowchart of a PMI-based processing method according to an embodiment of the present invention;

6 is a schematic structural diagram of a PMI-based processing apparatus according to an embodiment of the present invention;

7 is a schematic structural diagram of another PMI-based processing apparatus according to an embodiment of the present invention;

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

FIG. 9 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a PMI-based processing system on an embodiment of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

In order to support the closed-loop single-layer precoding scheme of the control channel, one solution is to directly use the PMI of the data channel of a certain subband as the PMI of the control channel of the corresponding subband. This scheme can be used directly when the data channel adopts a single-stream precoding scheme. However, when the terminal feeds back the indication of the multi-layer codeword, that is, when the data channel adopts the multi-stream precoding method, it cannot be directly used for single-layer transmission of the control channel, that is, the PMI of the data channel cannot be directly used as the corresponding sub-channel. PMI of the control channel of the band.

Based on this, in various embodiments of the present invention: when the terminal feeds back CSI to the base station, when the bandwidth of the subband corresponds to part or all of the bandwidth of the control channel, the fed back PMI and the first information indicate the preset data channel of the subband. The coding matrix and the precoding vector of the subband control channel; the data channel uses multi-stream precoding to transmit data; and the base station analyzes the CSI of the subband fed back by the terminal to obtain the PMI and the first information; use the PMI and the first information to determine a precoding matrix for the subband data channel and a precoding vector for the subband control channel.

The solution provided by this embodiment of the present invention can be understood as a solution in which the data channel PMI is used to indicate the control channel precoding. When the data channel is transmitted in a multi-stream precoding manner, when the CSI is fed back, the PMI and the first information are fed back, and the PMI and the first information are fed back. The fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel, so as to realize the feedback of the PMI of the control channel, so that the single-stream precoding transmission of the control channel can be supported This can effectively improve the coverage performance of the downlink control channel and improve the reliability of control information transmission.

An embodiment of the present invention provides a PMI-based processing method, which is applied to a terminal. As shown in FIG. 1 , the method includes:

Step 101: perform channel measurement on the subband;

Step 102: Feed back the CSI to the base station.

Wherein, when feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding matrix of the subband control channel. coding vector; the data channel uses multi-stream precoding to transmit data.

It should be noted that: when the data channel single-stream precoding method transmits data, the PMI fed back by the terminal is the PMI of the data channel, that is, the base station directly uses the PMI of the data channel as the PMI of the control channel.

In the solution provided by the embodiments of the present invention, the transmission of data and control information adopts a closed-loop transmission mode.

The base station configures the corresponding transmission mode based on the CSI fed back by the terminal. Specifically, the CSI includes: a channel quality indicator (CQI, Channel Quality Index), a rank indicator (RI, Rand Index), a PMI, a precoding type indicator (PTI, Precoding Type Index), and the like. Among them, there is a direct correspondence between PMI and RI and the number of antenna ports. For example, if RI is 1, PMI corresponds to the indication of a codeword in the single-layer codebook; RI=2, PMI corresponds to double-layer code. Indication of a codeword in the book; RI=4/8, PMI corresponds to a codebook in the 4/8 layer codebook; and so on. The codebook corresponding to the 2-antenna port and the codebook corresponding to the 4-antenna port are shown in Figure 2 and Figure 3, respectively.

Based on the direct correspondence between PMI and RI and the number of antenna ports, in this embodiment of the present invention, in the feedback CSI, when RI=1 (indicating that the data channel uses single-stream precoding to transmit data), the base station side can directly use The data channel PMI is used as the PMI of the control channel of the corresponding subband; when RI>=2 (indicating that the data channel adopts the multi-stream precoding mode to transmit data), the PMI and the first information are used to indicate the precoding of the subband data channel matrix and precoding vector for the subband control channel.

Here, in practical application, the extra bits except the PMI of the data channel may not be needed, and a vector at a fixed position or a random position in the multi-stream codeword indicated by the PMI of the data channel may be selected as the precoding vector of the control channel.

Based on this, in some embodiments, the manner of feeding back the PMI and the first information may be:

Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel.

It may also be necessary to feed back additional information bits other than the PMI of the data channel to indicate that a precoding vector in the multi-layer codeword is fed back as the precoding vector of the control channel, which can effectively support the unified precoding of the data channel and the control channel. design, so that the number of signaling processes and feedback bits can be reduced.

Based on this, in some embodiments, the manner of feeding back the PMI and the first information may be:

The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel.

Here, when the PMI of the subband data channel is fed back, and the feedback first information is not empty, the first information can independently indicate the precoding vector of the subband control channel; or, the first information and The PMI of the subband data channel jointly indicates the precoding vector of the subband control channel.

Wherein, in practical application, the base station and the terminal may agree in advance which of the above two methods is specifically adopted to realize the indication of the precoding vector of the subband control channel.

In some embodiments, when the first information and the PMI of the subband data channel jointly indicate a precoding vector of the subband control channel, the PMI of the subband data channel indicates a code in a codebook word; the first information indicates a precoding vector at a specific position in the codeword.

Since there are two ways of feeding back the PMI and the first information, in practical application, when the terminal supports the two feedback ways, the base station can configure which way the terminal uses to feed back the PMI and the first information through high-layer signaling.

Based on this, in some embodiments, the method may further include:

Receive RRC signaling or system information sent by the base station;

Parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information;

Correspondingly, when feeding back the CSI, the PMI and the first information are fed back according to the obtained manner.

Of course, when the terminal supports only one feedback mode, the PMI and the first information are fed back by using the feedback mode supported by the terminal.

The base station needs to perform corresponding processing based on the CSI fed back by the terminal. Based on this, an embodiment of the present invention also provides a PMI-based processing method, which is applied to the base station. As shown in Figure 4, the method includes:

Step 401: Receive the CSI of the subband fed back by the terminal;

Here, the bandwidth of the subband corresponds to part or all of the control channel bandwidth.

Step 402: Parse the CSI to obtain PMI and first information;

Step 403: Determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel by using the PMI and the first information.

Wherein, the subband data channel transmits data in a multi-stream precoding manner.

Here, in practical application, when the subband data channel transmits data in a single-stream precoding manner, the base station directly uses the PMI of the subband data channel as the PMI of the subband control channel.

In the solution provided by the embodiments of the present invention, the transmission of data and control information adopts a closed-loop transmission mode.

As mentioned above, the base station configures the corresponding transmission mode based on the CSI fed back by the terminal. When configuring the transmission mode, the precoding matrix of the subband data channel and the precoding vector of the subband control channel need to be determined.

Wherein, when determining the precoding vector of the control channel, when RI=1 (indicating that the data channel adopts the single-stream precoding method to transmit data), the base station side can directly use the data channel PMI as the PMI of the control channel of the corresponding subband; when When RI>=2 (indicating that the data channel uses multi-stream precoding to transmit data), the PMI and the first information are used to indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel.

Here, in practical application, when a vector of a fixed position or a random position in the multi-stream codeword indicated by the PMI of the data channel is selected as the precoding vector of the control channel, that is, the PMI obtained by analysis is the subband data. When the PMI of the channel is empty and the first information is empty, the precoding matrix of the subband data channel and the precoding vector of the subband control channel may be determined in the following manner:

Use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; and use the fixed position or random position vector in the precoding matrix corresponding to the PMI of the subband data channel as the subband Precoding vector for the control channel.

It may also be necessary to feed back additional information bits other than the PMI of the data channel to indicate to feed back a precoding vector in the multi-layer codeword as the precoding vector of the control channel, that is, when the PMI is the data channel of the subband data channel. When the PMI and the first information is not empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; and use the first information to determine the precoding of the subband control channel vector.

Since there are two ways of feeding back the PMI and the first information, that is, the base station can determine the precoding matrix of the subband data channel and the precoding of the subband control channel in one of the above two ways Therefore, in practical applications, when the terminal supports two feedback modes, the base station can configure which mode the terminal adopts to feed back the PMI and the first information through high-layer signaling.

Based on this, in some embodiments, before the receiving the CSI of the subband fed back by the terminal, that is, before performing step 401, the method may further include:

The feedback mode of the PMI and the first information is indicated to the terminal through RRC signaling or system information.

Wherein, when using the first information to determine the precoding vector of the subband control channel, the base station can use the first information to independently determine the precoding vector of the subband control channel; or use the first information to determine the precoding vector of the subband control channel independently; The information and the PMI of the subband data channel jointly determine the precoding vector for the subband control channel.

Here, in practical application, the base station and the terminal may agree in advance which of the above two methods is specifically adopted to realize the indication of the precoding vector of the subband control channel. Therefore, the base station can use the first information to determine the precoding vector of the subband control channel based on the agreed indication manner.

Wherein, in some embodiments, when the first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel, the base station uses the PMI using the subband data channel , determine a codeword in a codebook;

The base station uses the precoding vector at a specific position in the codeword indicated by the first information as the precoding vector of the subband control channel.

An embodiment of the present invention also provides a PMI-based processing method, as shown in Figure 5, the method includes;

Step 501: the terminal performs channel measurement on the subband and feeds back CSI to the base station;

Wherein, when feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding matrix of the subband control channel. coding vector; the data channel uses multi-stream precoding to transmit data.

Step 502: the base station receives the CSI of the subband fed back by the terminal;

Step 503: the base station parses the CSI to obtain the feedback PMI and first information;

Step 504: The base station determines the precoding matrix of the subband data channel and the precoding vector of the subband control channel by using the fed back PMI and the first information.

It should be noted that the specific processing procedures of the terminal and the base station have been described in detail above, and will not be repeated here.

In the PMI-based processing method provided by the embodiment of the present invention, when the data channel is transmitted in a multi-stream precoding manner, when feeding back CSI, the PMI and the first information are fed back, and the fed back PMI and the first information are used to indicate the subband The precoding matrix of the data channel and the precoding vector of the sub-band control channel realize the feedback of the PMI of the control channel. In this way, the single-stream precoding transmission mode of the control channel can be supported, thereby effectively improving the coverage performance of the downlink control channel. , to improve the reliability of control information transmission.

The solution of the present invention will be described in detail below in conjunction with application examples.

Application Example 1

The application scenario of this application embodiment is: the base station side has 4 antenna ports, and the codebook is shown in FIG. 3 . In a cell, multiple terminals (including terminal 1, terminal 2, and terminal 3) are configured in a closed-loop transmission mode.

In this application embodiment, the base station side fixedly selects the first vector in the feedback codeword as the precoding vector of the control channel.

The step of the base station determining the precoding vector of the control channel of each terminal includes:

First, each terminal feeds back CSI to the base station;

Specifically, terminal 1 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=1, PMI occupies 4 bits, specifically 0001. Combined with the codebook shown in FIG. 3, the single-layer codeword corresponding to PMI is W ₁ ^{1} =[1-j 1j] .

Terminal 2 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=2, PMI occupies 4 bits, specifically 1000. Combined with the codebook shown in FIG. 3, the double-layer codeword corresponding to PMI is:

Terminal 3 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=3, and PMI occupies 4 bits, specifically 1100. Combined with the codebook shown in FIG. 3, the two-layer codeword corresponding to PMI is:

Secondly, after receiving the CSI fed back by each terminal, the base station side determines the precoding vector of each control channel.

Specifically, for terminal 1, the base station directly uses W ₁ ^{1} as the precoding vector of the control channel.

For terminal 2, since W ₈ ^{1} is the first precoding vector in the W ₈ ^{1,2} codeword, W ₈ ^{1} is used as the precoding vector of the control channel.

For terminal 3, since for The first precoding vector in the codeword, so use as the precoding vector for the control channel.

Application Example 2

The application scenario of this application embodiment is: the base station side has 4 antenna ports, and the codebook is shown in FIG. 3 . In a cell, multiple terminals (including terminal 1, terminal 2, and terminal 3) are configured in a closed-loop transmission mode.

In this application embodiment, the base station side randomly selects a vector in the feedback codeword as the precoding vector of the control channel.

The step of the base station determining the precoding vector of the control channel of each terminal includes:

First, each terminal feeds back CSI to the base station;

Specifically, terminal 1 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Wherein, in the fed back CSI, RI=1, PMI occupies 4 bits, specifically 0001. Combined with the codebook shown in FIG. 3, the single-layer codeword corresponding to PMI is W ₁ ^{1} =[1 −j 1 j ].

Terminal 2 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=2, PMI occupies 4 bits, specifically 1000. Combined with the codebook shown in FIG. 3, the double-layer codeword corresponding to PMI is:

Terminal 3 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=3, and PMI occupies 4 bits, specifically 1100. Combined with the codebook shown in FIG. 3, the two-layer codeword corresponding to PMI is:

Secondly, after receiving the CSI fed back by each terminal, the base station side determines the precoding vector of each control channel.

Specifically, for terminal 1, the base station directly uses W ₁ ^{1} as the precoding vector of the control channel.

For terminal 2, the base station randomly uses W ₈ ^{2} as the precoding vector of the control channel for terminal 2.

For terminal 3, the base station randomly adopts the as the precoding vector for the control channel.

where W8{ ₂ ^} is the second vector in the codeword, for The third vector in the codeword.

Application Example 3

The application scenario of this application embodiment is: the base station side has 4 antenna ports, and the codebook is shown in FIG. 3 . In a cell, multiple terminals (including terminal 1, terminal 2, and terminal 3) are configured in a closed-loop transmission mode.

In this application embodiment, the base station configures the terminal through high-layer signaling and needs to use a vector in the feedback codeword of additional information bits as the precoding vector of the control channel, that is, the first information is not empty.

The step of the base station determining the precoding vector of the control channel of each terminal includes:

First, each terminal feeds back CSI to the base station;

Specifically, terminal 1 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Wherein, in the fed back CSI, RI=1, PMI occupies 4 bits, specifically 0001. Combined with the codebook shown in FIG. 3, the single-layer codeword corresponding to PMI is W ₁ ^{1} =[1 −j 1 j ].

Terminal 2 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=2, PMI occupies 4 bits, specifically 1000. Combined with the codebook shown in FIG. 3, the double-layer codeword corresponding to PMI is: At the same time, for the single-stream precoding scheme of the control channel, the first vector in the codeword, namely W ₈ ^{1} , has the best performance, so according to the received high-level signaling instruction, an additional 1-bit instruction is required, which is specifically designed to be 0 , that is, the bit information fed back by the terminal 2 for the PMI is 10000.

Terminal 3 performs channel measurement on the subband corresponding to its control channel, and feeds back CSI;

Among them, in the fed back CSI, RI=3, and PMI occupies 4 bits, specifically 1100. Combined with the codebook shown in FIG. 3, the two-layer codeword corresponding to PMI is: At the same time, for the control channel single-stream precoding scheme, the second vector in the codeword is The performance is optimal, so according to the received high-layer signaling, an additional 2-bit indication is required, which is specifically designed to be 01, that is, the bit information fed back by the terminal 3 for the PMI is 110001.

Secondly, after receiving the CSI fed back by each terminal, the base station side determines the precoding vector of each control channel.

Specifically, for terminal 1, the base station directly uses W ₁ ^{1} as the precoding vector of the control channel.

For terminal 2, the base station determines the precoding vector of the control channel according to the bit information fed back for the PMI, that is, the last bit of 10000 is determined as The first vector in the codeword, namely W ₈ ^{1} .

For terminal 3, the base station determines the precoding vector of the control channel according to the bit information fed back for the PMI, that is, the last 2 bits of the determination of 110001 are: The second vector in the codeword, i.e.

where W ₈ ^{1} is the first precoding vector in the W ₈ ^{1,2} codeword, for The second vector in the codeword.

As can be seen from the solution of the application example, in the solution of the embodiment of the present invention:

1. If a subband corresponds to part or all of the control channel bandwidth, perform unified PMI feedback for the data channel and control channel of the subband;

2. In the feedback CSI, when RI=1, the base station side can directly use the data channel PMI as the PMI of the control channel of the corresponding subband.

In the feedback CSI, when RI>=2 and no additional bits are fed back to indicate the precoding vector of the control channel, a vector based on a fixed position or a random position in the multi-stream codeword can be selected as the control precoding vector; or , when RI>=2 and there is an extra bit to feed back the precoding vector indicating the control channel, a vector in the feedback codeword is indicated as a control precoding vector indication.

Among them, it is assumed that the number of additional feedback bits is n, and the size of RI is r, and the requirement is: 2 ⁿ ≥ r.

3. The base station can indicate whether the feedback mode of the current terminal requires additional bits by means of high-level signaling.

In order to realize the method of the embodiment of the present invention, the embodiment of the present invention provides a PMI-based processing device, which is set at the terminal. As shown in FIG. 6 , the device includes:

a measurement module 61, configured to perform channel measurement on the subband;

The feedback module 62 is used to feed back the CSI to the base station; wherein,

When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data.

It should be noted that: when the data channel single-stream precoding method transmits data, the PMI fed back by the feedback module 62 is the PMI of the data channel, that is, the base station directly uses the PMI of the data channel as the PMI of the control channel.

In the solution provided by the embodiments of the present invention, the transmission of data and control information adopts a closed-loop transmission mode.

Here, in practical application, the extra bits except the PMI of the data channel may not be needed, and a vector at a fixed position or a random position in the multi-stream codeword indicated by the PMI of the data channel may be selected as the precoding vector of the control channel. It may also be necessary to feed back additional information bits other than the PMI of the data channel to indicate that a precoding vector in the multi-layer codeword is fed back as the precoding vector of the control channel, which can effectively support the unified precoding of the data channel and the control channel. design, so that the number of signaling processes and feedback bits can be reduced.

Based on this, in some embodiments, the feedback module 62 is specifically configured to feed back the PMI and the first information in one of the following ways:

Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel;

The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel.

Here, when the PMI of the subband data channel is fed back, and the feedback first information is not empty, the first information can independently indicate the precoding vector of the subband control channel; or, the first information and The PMI of the subband data channel jointly indicates the precoding vector of the subband control channel.

Wherein, in practical application, the base station and the terminal may agree in advance which of the above two methods is specifically adopted to realize the indication of the precoding vector of the subband control channel.

In some embodiments, when the first information and the PMI of the subband data channel jointly indicate a precoding vector of the subband control channel, the PMI of the subband data channel indicates a code in a codebook word; the first information indicates a precoding vector at a specific position in the codeword.

Since there are two ways of feeding back the PMI and the first information, in practical application, when the terminal supports the two feedback ways, the base station can configure which way the terminal uses to feed back the PMI and the first information through high-layer signaling.

Based on this, in some embodiments, the apparatus may further include: a receiving and parsing unit, configured to:

Receive the RRC signaling or system information sent by the base station;

Parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information;

Correspondingly, the feedback unit 62 feeds back the PMI and the first information according to the obtained manner.

It should be noted that when the PMI-based processing apparatus provided in the above embodiments performs PMI processing, only the division of the above-mentioned program modules is used as an example for illustration. In practical applications, the above-mentioned processing may be allocated to different program modules as required. Completion means dividing the internal structure of the device into different program modules to complete all or part of the processing described above.

In practical application, the measurement module 61 , the feedback module 62 , and the receiving and parsing module may be implemented by a processor in a PMI-based processing device in combination with a communication interface.

In order to implement the method of the embodiment of the present invention, the embodiment of the present invention further provides a PMI-based processing device, which is set at the base station. As shown in FIG. 7 , the device includes:

The receiving unit 71 is used for receiving the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth;

a parsing unit 72, configured to parse the CSI to obtain PMI and first information;

A determination unit 73, configured to use the PMI and the first information to determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel; the subband data channel is transmitted in a multi-stream precoding manner data.

Here, in practical application, when the subband data channel adopts the single-stream precoding mode to transmit data, the determining unit 73 directly uses the PMI of the subband data channel as the PMI of the subband control channel.

In the solution provided by the embodiments of the present invention, the transmission of data and control information adopts a closed-loop transmission mode.

Here, in practical application, when a vector of a fixed position or a random position in the multi-stream codeword indicated by the PMI of the data channel is selected as the precoding vector of the control channel, that is, the PMI obtained by analysis is the subband data. When the PMI of the channel and the first information is empty, the determining unit 73 is specifically configured to:

Use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; and use the fixed position or random position vector in the precoding matrix corresponding to the PMI of the subband data channel as the subband Precoding vector for the control channel.

It may also be necessary to feed back additional information bits other than the PMI of the data channel to indicate to feed back a precoding vector in the multi-layer codeword as the precoding vector of the control channel. Based on this, in some embodiments, the determining unit 73, specifically for:

When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel.

Since there are two ways of feeding back the PMI and the first information, that is, the base station can determine the precoding matrix of the subband data channel and the precoding of the subband control channel in one of the above two ways Therefore, in practical applications, when the terminal supports two feedback modes, the base station can configure which mode the terminal adopts to feed back the PMI and the first information through high-layer signaling.

Based on this, in some embodiments, the apparatus may further include:

The indicating unit is used to indicate the feedback mode of the PMI and the first information to the terminal through RRC signaling or system information before receiving the CSI of the subband fed back by the terminal.

Wherein, when using the first information to determine the precoding vector of the subband control channel, the determining unit 73 may independently determine the precoding vector of the subband control channel by using the first information; or The determining unit 73 uses the first information and the PMI of the subband data channel to jointly determine the precoding vector of the subband control channel.

Wherein, in some embodiments, when the first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel, the determining unit 73 utilizes the subband data channel PMI, determine the codeword in a codebook;

The determining unit 73 takes the precoding vector of the specific position in the codeword indicated by the first information as the precoding vector of the subband control channel.

It should be noted that when the PMI-based processing apparatus provided in the above embodiments performs PMI processing, only the division of the above-mentioned program modules is used as an example for illustration. In practical applications, the above-mentioned processing may be allocated to different program modules as required. Completion means dividing the internal structure of the device into different program modules to complete all or part of the processing described above.

In practical application, the receiving unit 71 and the indicating unit can be realized by the processor in the PMI-based processing device in conjunction with the communication interface; the parsing unit 72 and the determining unit 73 can be realized by the processor in the PMI-based processing device.

Based on the hardware implementation of the above device, an embodiment of the present invention further provides a terminal. As shown in FIG. 8 , the terminal 80 includes:

the first communication interface 81, capable of information interaction with the base station;

The first processor 82 is connected to the first communication interface to realize information exchange with the base station, and is used to execute the method provided by one or more technical solutions on the terminal side when running the computer program.

Specifically, the first processor 82 is configured to perform channel measurement on the subband;

The first communication interface 81 is used to feed back CSI to the base station; wherein,

When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data.

Wherein, in an embodiment, the manner in which the first communication interface 81 feeds back the PMI and the first information includes one of the following:

Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel;

The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel.

In an embodiment, the first communication interface 81 is further configured to receive radio resource control RRC signaling or system information sent by the base station;

The first processor 82 is further configured to parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information;

Correspondingly, the first communication interface 81 feeds back the PMI and the first information according to the obtained manner.

Of course, in practical application, as shown in Figure 8, the terminal may also include:

a first memory 83, on which the computer program is stored;

User interface 84 .

The various components in the terminal 80 are coupled together through a bus system 85 . It will be appreciated that the bus system 85 is used to implement the connection communication between these components. In addition to the data bus, the bus system 85 also includes a power bus, a control bus and a status signal bus. For clarity, however, the various buses are labeled as bus system 85 in FIG. 8 .

The user interface 84 may include a display, a keyboard, a mouse, a trackball, a click wheel, keys, buttons, a touch pad or a touch screen, and the like.

The first memory 83 in the embodiment of the present invention is used to store various types of data to support the operation of the terminal 80 .

The terminal-side method disclosed in the above embodiments of the present invention may be applied to the first processor 82, or implemented by the first processor 82. The first processor 82 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit in the first processor 82 or the instructions in the form of software. The above-mentioned first processor 82 may be a general-purpose processor, a digital signal processor (DSP, Digital Signal Processor), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The first processor 82 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. In combination with the steps of the methods disclosed in the embodiments of the present invention, it can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the first memory 83, and the first processor 82 reads the information in the first memory 83, and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, the terminal 80 may be implemented by one or more Application Specific Integrated Circuit (ASIC, Application Specific Integrated Circuit), DSP, Programmable Logic Device (PLD, Programmable Logic Device), Complex Programmable Logic Device (CPLD, Complex) Programmable Logic Device), Field-Programmable Gate Array (FPGA, Field-Programmable Gate Array), general-purpose processor, controller, microcontroller (MCU, Micro Controller Unit), microprocessor (Microprocessor), or other electronic components to achieve , used to perform the aforementioned method.

Based on the hardware implementation of the above device, an embodiment of the present invention further provides a base station. As shown in FIG. 9 , the base station 90 includes:

The second communication interface 91 is capable of information interaction with the base station;

The second processor 92 is connected to the first communication interface to implement information exchange with the base station, and is used to execute the method provided by one or more technical solutions on the terminal side when running the computer program.

Specifically, the second communication interface 91 is used to receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth;

The second processor 92 is configured to parse the CSI to obtain PMI and first information; determine the precoding matrix of the subband data channel and the precoding matrix of the subband control channel by using the PMI and the first information. coding vector; the subband data channel uses multi-stream precoding to transmit data.

In one embodiment, the second processor 92 is specifically configured to perform one of the following operations:

When the PMI is the PMI of the subband data channel and the first information is empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; The fixed position or random position vector in the precoding matrix corresponding to the PMI of the data channel is used as the precoding vector of the subband control channel;

When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel.

In one embodiment, the second processor 92 is configured to perform one of the following operations:

independently determining a precoding vector for the subband control channel using the first information;

The precoding vector of the subband control channel is jointly determined using the first information and the PMI of the subband data channel.

In an embodiment, the second processor 92 is specifically configured to:

Using the PMI of the subband data channel, determine a codeword in a codebook;

The precoding vector at a specific position in the codeword indicated by the first information is used as the precoding vector of the subband control channel.

In an embodiment, the second communication interface 91 is further configured to indicate the feedback mode of the PMI and the first information to the terminal through RRC signaling or system information before receiving the CSI of the subband fed back by the terminal.

In an embodiment, the second processor 92 is further configured to: when the subband data channel transmits data in a single-stream precoding manner, use the PMI of the subband data channel directly as the subband PMI of the control channel.

Of course, in practical application, as shown in Figure 9, the terminal may also include:

A second memory 93 on which the computer program is stored.

The various components in the base station 90 are coupled together through a bus system 94 . It will be appreciated that the bus system 94 is used to implement the connection communication between these components. In addition to the data bus, the bus system 94 also includes a power bus, a control bus and a status signal bus. For the sake of clarity, however, the various buses are labeled as bus system 94 in FIG. 9 .

The second memory 93 in the embodiment of the present invention is used for storing various types of data to support the operation of the base station 90 .

The methods disclosed in the above embodiments of the present invention may be applied to the second processor 92, or implemented by the second processor 92. The second processor 92 may be an integrated circuit chip with signal processing capability. In the implementation process, each step of the above-mentioned method can be completed by a hardware integrated logic circuit in the second processor 92 or an instruction in the form of software. The aforementioned second processor 92 may be a general-purpose processor, a DSP, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. The second processor 92 may implement or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software module may be located in a storage medium, and the storage medium is located in the second memory 93, and the second processor 92 reads the information in the second memory 93, and completes the steps of the foregoing method in combination with its hardware.

In an exemplary embodiment, base station 90 may be implemented by one or more ASICs, DSPs, PLDs, CPLDs, FPGAs, general purpose processors, controllers, MCUs, Microprocessors, or other electronic components for performing the aforementioned methods.

It can be understood that the memory (for example, the first memory 83 and the second memory 93 ) in this embodiment of the present invention may be a volatile memory or a non-volatile memory, and may also include both volatile and non-volatile memories . Wherein, the non-volatile memory may be a read-only memory (ROM, Read Only Memory), a programmable read-only memory (PROM, Programmable Read-Only Memory), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory) Memory), Electrically Erasable Programmable Read-Only Memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), Magnetic Random Access Memory (FRAM, ferromagneticrandom access memory), Flash Memory (Flash Memory), Magnetic Surface Memory, Optical Disc, Or compact disc read-only memory (CD-ROM, Compact Disc Read-Only Memory); magnetic surface memory can be magnetic disk memory or tape memory. The volatile memory may be a random access memory (RAM, Random Access Memory), which is used as an external cache memory. By way of example and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Synchronous Static Random Access Memory (SSRAM), Dynamic Random Access Memory (DRAM, Dynamic Random Access Memory), Synchronous Dynamic Random Access Memory (SDRAM, Synchronous Dynamic Random Access Memory), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM, Double Data Rate Synchronous Dynamic Random Access Memory), Enhanced Synchronous Dynamic Random Access Memory Access memory (ESDRAM, Enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, SyncLink Dynamic Random Access Memory), Direct memory bus random access memory (DRRAM, Direct Rambus Random Access Memory). The memories described in the embodiments of the present invention are intended to include, but not be limited to, these and any other suitable types of memories.

In an exemplary embodiment, this embodiment of the present invention further provides a computer-readable storage medium, for example, including a first memory 83 storing a computer program, and the computer program stored in the first memory 83 can be stored by the first processor of the terminal 80. 82 is executed to complete the steps of the aforementioned terminal-side method; it may also include a second memory 93 that stores computer programs, and the computer programs stored in the second memory 93 can be executed by the second processor 92 of the base station 90 to complete the aforementioned base station. the steps described in the side method.

It should be noted that the computer-readable storage medium provided by the embodiment of the present invention may be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface memory, optical disk, or CD-ROM; it may also include the above-mentioned memory. One or any combination of various devices.

In order to realize the method of the embodiment of the present invention, the embodiment of the present invention also provides a PMI-based processing system, as shown in Figure 10, the system includes:

The terminal 101 is configured to perform channel measurement on the subband and feed back the CSI to the base station 102; wherein, when feeding back the CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the The precoding matrix of the subband data channel and the precoding vector of the subband control channel; the data channel adopts a multi-stream precoding mode to transmit data;

The base station 102 is configured to receive the CSI of the subband fed back by the terminal 101; parse the CSI to obtain the fed back PMI and first information; and determine the precoding of the subband data channel by using the fed back PMI and the first information matrix and precoding vector for the subband control channel.

It should be noted that: the specific processing procedures of the terminal 101 and the base station 102 have been described in detail above, and will not be repeated here.

The above descriptions are merely preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention.

Claims (25)

1. A processing method for indicating PMI based on a precoding matrix, wherein the method comprises: Channel measurement is performed on the subband and the channel state information CSI is fed back to the base station; wherein, When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data. 2. The method according to claim 1, wherein the manner of feeding back the PMI and the first information comprises one of the following: Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel; The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel. 3. The method according to claim 2, wherein the method further comprises: Receive radio resource control RRC signaling or system information sent by the base station; Parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information; Correspondingly, the PMI and the first information are fed back according to the obtained manner. 4. The method according to claim 2, wherein when the PMI of the subband data channel is fed back, and the first information fed back is not empty, one of the following characteristics is satisfied: the first information independently indicates the precoding vector of the subband control channel; The first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel. The method according to claim 4, wherein when the first information and the PMI of the subband data channel jointly indicate the precoding vector of the subband control channel, the The PMI indicates a codeword in a codebook; the first information indicates a precoding vector at a specific position in the codeword. 6. A PMI-based processing method, wherein the method comprises: Receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth; Parse the CSI to obtain PMI and first information; use the PMI and the first information to determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel; the subband data channel adopts Data is transmitted by multi-stream precoding. 7. The method according to claim 6, wherein the manner of determining the precoding matrix of the subband data channel and the precoding vector of the subband control channel by using the PMI and the first information comprises the following: one: When the PMI is the PMI of the subband data channel and the first information is empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; The fixed position or random position vector in the precoding matrix corresponding to the PMI of the data channel is used as the precoding vector of the subband control channel; When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel. 8. The method according to claim 7, wherein the manner of determining the precoding vector of the subband control channel by using the first information comprises one of the following manners: independently determining a precoding vector for the subband control channel using the first information; The precoding vector of the subband control channel is jointly determined by using the first information and the PMI of the subband data channel. 9 . The method according to claim 8 , wherein the jointly determining the precoding vector of the subband control channel by using the first information and the PMI of the subband data channel comprises: 10 . Using the PMI of the subband data channel, determine a codeword in a codebook; The precoding vector of the specific position in the codeword indicated by the first information is used as the precoding vector of the subband control channel. 10. The method according to claim 7, wherein before receiving the CSI of the subband fed back by the terminal, the method further comprises: The feedback mode of the PMI and the first information is indicated to the terminal through RRC signaling or system information. 11. The method according to any one of claims 6 to 10, wherein the method further comprises: When the subband data channel adopts the single-stream precoding mode to transmit data, the PMI of the subband data channel is directly used as the PMI of the subband control channel. 12. A PMI-based processing device, wherein the device comprises: a measurement module, used to perform channel measurement on the subband; a feedback module for feeding back the CSI to the base station; wherein, When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data. 13. A PMI-based processing device, wherein the device comprises: a receiving unit, configured to receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth; a parsing unit, configured to parse the CSI to obtain the PMI and the first information; a determining unit, configured to use the PMI and the first information to determine the precoding matrix of the subband data channel and the precoding vector of the subband control channel; the subband data channel uses multi-stream precoding to transmit data . 14. A terminal, wherein the terminal comprises: a first processor, configured to perform channel measurement on the subband; a first communication interface for feeding back CSI to the base station; wherein, When feeding back CSI, when the bandwidth of the subband corresponds to part or all of the control channel bandwidth, the fed back PMI and the first information indicate the precoding matrix of the subband data channel and the precoding vector of the subband control channel ; the data channel adopts multi-stream precoding mode to transmit data. 15. The terminal according to claim 14, wherein a manner in which the first communication interface feeds back the PMI and the first information comprises one of the following: Feeding back the PMI of the subband data channel, and feeding back that the first information is empty; the PMI of the subband data channel indicates the precoding matrix of the subband data channel; and the fixed position vector or random position in the precoding matrix The vector of is used for the base station to determine the precoding vector of the subband control channel; The PMI of the subband data channel is fed back, and the first information fed back is not empty, and the first information is used for the base station to determine the precoding vector of the subband control channel. 16. The terminal according to claim 15, wherein, The first communication interface is further configured to receive radio resource control RRC signaling or system information sent by the base station; The first processor is further configured to parse the RRC signaling or system information to obtain the PMI and the feedback mode of the first information; Correspondingly, the first communication interface feeds back the PMI and the first information according to the obtained manner. 17. A base station, wherein the base station comprises: The second communication interface is used to receive the CSI of the subband fed back by the terminal; the bandwidth of the subband corresponds to part or all of the control channel bandwidth; a second processor, configured to parse the CSI to obtain PMI and first information; determine a precoding matrix of the subband data channel and a precoding vector of the subband control channel by using the PMI and the first information; The subband data channel transmits data in a multi-stream precoding manner. 18. The base station according to claim 17, wherein the second processor is specifically configured to perform one of the following operations: When the PMI is the PMI of the subband data channel and the first information is empty, use the PMI of the subband data channel to determine the precoding matrix of the subband data channel; The fixed position or random position vector in the precoding matrix corresponding to the PMI of the data channel is used as the precoding vector of the subband control channel; When the PMI is the PMI of the subband data channel and the first information is not empty, the precoding matrix of the subband data channel is determined by using the PMI of the subband data channel; and the first information is used to determine the precoding matrix of the subband data channel. A message determines the precoding vector for the subband control channel. 19. The base station according to claim 18, wherein the second processor is configured to perform one of the following operations: independently determining a precoding vector for the subband control channel using the first information; The precoding vector of the subband control channel is jointly determined by using the first information and the PMI of the subband data channel. 20. The base station according to claim 19, wherein the second processor is specifically configured to: Using the PMI of the subband data channel, determine a codeword in a codebook; The precoding vector of the specific position in the codeword indicated by the first information is used as the precoding vector of the subband control channel. 21. The base station according to claim 18, wherein the second communication interface is further configured to feed back the PMI and the first information through RRC signaling or system information before receiving the CSI of the subband fed back by the terminal. mode is indicated to the terminal. 22. The base station according to any one of claims 17 to 21, wherein the second processor is further configured to: When the subband data channel adopts the single-stream precoding mode to transmit data, the PMI of the subband data channel is directly used as the PMI of the subband control channel. 23. A terminal, characterized in that the terminal comprises: a first processor, a first memory, and a computer program stored on the first memory and capable of running on the first processor; Wherein, when the first processor is configured to execute the computer program, the steps of the method of any one of claims 1 to 5 are executed. 24. A base station, comprising: a second processor, a second memory, and a computer program stored on the second memory and capable of running on the second processor; Wherein, when the second processor is configured to execute the computer program, the steps of the method according to any one of claims 6 to 11 are executed. 25. A computer-readable storage medium on which a computer program is stored, characterized in that, when the computer program is executed by a processor, the steps of the method of any one of claims 1 to 5 are implemented, or the method of claim 6 is implemented. to the steps of any one of 11.