CN111130604A

CN111130604A - CSI feedback method, terminal and network side equipment

Info

Publication number: CN111130604A
Application number: CN201811296301.8A
Authority: CN
Inventors: 李辉; 高秋彬; 陈润华
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2018-11-01
Filing date: 2018-11-01
Publication date: 2020-05-08
Anticipated expiration: 2038-11-01
Also published as: CN111130604B

Abstract

The embodiment of the invention provides a CSI feedback method, a terminal and network side equipment. The method comprises the following steps: the terminal determines beams of a plurality of transmission layers, wherein the plurality of transmission layers comprise transmission layers with different using beam numbers; the terminal sends CSI to network side equipment, wherein the CSI comprises beam index information, and the beam index information is used for indicating each transmission layer to use beams. The embodiment of the invention can reduce the cost of codebook feedback.

Description

CSI feedback method, terminal and network side equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a Channel State Information (CSI) feedback method, a terminal, and a network side device.

Background

Versions defined in a New Radio (NR) system include a Type I codebook (Type I) and a Type II codebook (Type II). The Type I codebook is based on beam selection and phase adjustment, the feedback overhead is small, the quantization precision of the channel is low, and the Type II codebook is based on linear combination of beams, the feedback overhead is large, and the channel quantization precision is high. In addition, in the current Type II codebook based on beam linear combining, each transmission layer uses the same L beams for linear combining, that is, the number of beams and the beams used by each transmission layer are the same, which results in a relatively large overhead for codebook feedback.

Disclosure of Invention

The embodiment of the invention provides a CSI feedback method, a terminal and network side equipment, and aims to solve the problem that the overhead of codebook feedback is high.

In order to achieve the above object, an embodiment of the present invention provides a CSI feedback method, including:

the terminal determines beams of a plurality of transmission layers, wherein the plurality of transmission layers comprise transmission layers with different using beam numbers;

the terminal sends CSI to network side equipment, wherein the CSI comprises beam index information, and the beam index information is used for indicating each transmission layer to use beams.

Optionally, the multiple transmission layers include at least one first type transmission layer and at least one second type transmission layer, where the first type transmission layer is formed by linearly combining multiple beams, the second type transmission layer is formed by one beam or by linearly combining multiple beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

Optionally, the beam index information includes:

one or more of the first type of transport layer using a set of indices of beams; and

one or more of the second type of transport layers use a set of indices of beams.

Optionally, the beam index information includes:

first and second beam index information;

wherein the first beam index information includes indexes of a plurality of beams to which beams used by the plurality of transmission layers belong;

the second beam index information includes a set of indices for beams used by one or more of the plurality of transport layers.

Optionally, if the plurality of transmission layers include transmission layers using beams for all beams indicated by the first beam index information, the second beam index information includes indexes of beams used by transmission layers other than the transmission layer; or

The second beam index information includes a set of indices of beams used by each of the plurality of transmission layers, wherein if there are transmission layers using the same beam, the transmission layers using the same beam in the second beam index information share the set of the same group of beam indices.

Optionally, the second type of transmission layer used beams belong to a part of the first type of transmission layer used beams; or

The second type of transmission layer uses a beam different from the beam used by the first type of transmission layer.

Optionally, the CSI further includes:

layer indication information, wherein the layer indication information is used for indicating related information of at least one of the first type of transmission layer and the second type of transmission layer.

Optionally, the information related to at least one of the first type of transport layer and the second type of transport layer includes:

a layer index belonging to the first type of transport layer among the plurality of transport layers, and/or a layer index belonging to the second type of transport layer among the plurality of transport layers;

or,

a transport layer type to which each of the plurality of transport layers belongs;

or,

a number of the first type of transmission layers in the plurality of transmission layers, and/or a number of the second type of transmission layers in the plurality of transmission layers.

Optionally, the CSI includes at least two parts, and the terminal maps the layer indication information and Rank Indication (RI) to the first part of the CSI.

Optionally, the number of beams used by the first type of transmission layer is predefined or signaled by the network side device in a high layer, and/or the number of beams used by the second type of transmission layer is predefined or signaled by the network side device in a high layer;

and/or the presence of a gas in the gas,

the number of the transmission layers of the first type of transmission layer is predefined or the network side equipment notifies a high-level signaling notification, and/or the number of the transmission layers of the second type of transmission layer is predefined or the network side equipment notifies the high-level signaling notification;

and/or the presence of a gas in the gas,

the structural relationship between the index of the beam used by the first type of transmission layer and one or more transmission layers is predefined or signaled by the network side equipment high layer, and/or the structural relationship between the index of the beam used by the second type of transmission layer and one or more transmission layers is predefined or signaled by the network side equipment high layer.

The embodiment of the invention also provides a CSI feedback method, which comprises the following steps:

the method includes that network side equipment receives CSI sent by a terminal, wherein the CSI comprises beam index information, the beam index information is used for indicating beams used by each transmission layer in a plurality of transmission layers determined by the terminal, and the plurality of transmission layers comprise transmission layers with different using beam numbers.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

layer indication information, wherein the layer indication information is used for indicating related information of at least one of the first type of transmission layer and the second type of transmission layer;

the method further comprises the following steps:

and the network side equipment determines precoding according to the beam index information and the layer indication information.

or,

Optionally, the CSI includes at least two parts, and the layer indication information and the RI are mapped to the first part of the CSI.

Optionally, the number of beams used by the first type of transmission layer is predefined or the network side device notifies the terminal through a high-level signaling, and/or the number of beams used by the second type of transmission layer is predefined or the network side device notifies the terminal through a high-level signaling;

and/or the presence of a gas in the gas,

the number of the transmission layers of the first type of transmission layer is predefined or the network side equipment high-level signaling informs the terminal, and/or the number of the transmission layers of the second type of transmission layer is predefined or the network side equipment high-level signaling informs the terminal;

and/or the presence of a gas in the gas,

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

a determining module, configured to determine beams of a plurality of transmission layers, where the plurality of transmission layers include transmission layers using different numbers of beams;

a sending module, configured to send CSI to a network side device, where the CSI includes beam index information, and the beam index information is used to indicate each transmission layer to use a beam.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

or,

Optionally, the CSI includes at least two parts, and the terminal maps the layer indication information and the RI to the first part of the CSI.

and/or the presence of a gas in the gas,

An embodiment of the present invention further provides a network side device, including:

the CSI comprises beam index information, wherein the beam index information is used for indicating beams used by each transmission layer in a plurality of transmission layers determined by the terminal, and the plurality of transmission layers comprise transmission layers using different numbers of beams.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

the network side device further includes:

a determining module, configured to determine precoding according to the beam index information and the layer indication information.

or,

and/or the presence of a gas in the gas,

An embodiment of the present invention further provides a terminal, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the processor is configured to determine beams of a plurality of transmission layers, where the plurality of transmission layers include transmission layers using different numbers of beams;

the transceiver is configured to transmit CSI to a network side device, where the CSI includes beam index information, where the beam index information is used to indicate that each transmission layer uses a beam;

or,

the transceiver is configured to determine beams of a plurality of transmission layers, where the plurality of transmission layers include transmission layers using different numbers of beams;

the transceiver is further configured to transmit CSI to a network side device, where the CSI includes beam index information, and the beam index information is used to indicate that each transmission layer uses a beam.

Optionally, the beam index information includes:

first and second beam index information;

or,

and/or the presence of a gas in the gas,

An embodiment of the present invention further provides a network side device, including: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

the transceiver is configured to receive CSI sent by a terminal, where the CSI includes beam index information, where the beam index information is used to indicate a beam used by each of a plurality of transmission layers determined by the terminal, and the plurality of transmission layers include transmission layers using different numbers of beams.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

the processor or the transceiver is further configured to: and determining precoding according to the beam index information and the layer indication information.

or,

and/or the presence of a gas in the gas,

Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, where the program, when executed by a processor, implements the steps in the CSI feedback method on the terminal side provided in the embodiments of the present invention, or the program, when executed by the processor, implements the steps in the CSI feedback method on the network side device side provided in the embodiments of the present invention.

In the embodiment of the invention, a terminal determines beams of a plurality of transmission layers, wherein the plurality of transmission layers comprise transmission layers with different using beam numbers; the terminal sends CSI to network side equipment, wherein the CSI comprises beam index information, and the beam index information is used for indicating each transmission layer to use beams. In this way, since the plurality of transmission layers include transmission layers using different numbers of beams, overhead of codebook feedback is reduced.

Drawings

FIG. 1 is a schematic diagram of a network architecture to which embodiments of the present invention are applicable;

fig. 2 is a flowchart of a CSI feedback method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of another CSI feedback method provided by an embodiment of the present invention;

fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention;

fig. 5 is a structural diagram of a network side device according to an embodiment of the present invention;

fig. 6 is a structural diagram of another network-side device according to an embodiment of the present invention;

fig. 7 is a block diagram of another terminal according to an embodiment of the present invention;

fig. 8 is a structural diagram of another network-side device 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.

Referring to fig. 1, fig. 1 is a schematic diagram of a network structure to which the embodiment of the present invention is applicable, and as shown in fig. 1, the network structure includes a terminal 11 and a network side device 12, where the terminal 11 may be a User Equipment (UE) or other terminal devices, for example: a terminal side Device such as a Mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), or a Wearable Device (Wearable Device), it should be noted that a specific type of the terminal is not limited in the embodiment of the present invention. The network side device 12 may be a base station, for example: macro station, LTE eNB, 5G NRNB, etc.; the network side device may also be a small station, such as a Low Power Node (LPN), pico, femto, or an Access Point (AP); the base station may also be a network node that is composed of a Central Unit (CU) and a plurality of Transmission Reception Points (TRPs) whose management is and controls. It should be noted that, in the embodiment of the present invention, the specific type of the network-side device is not limited.

Referring to fig. 2, fig. 2 is a flowchart of a CSI feedback method according to an embodiment of the present invention, as shown in fig. 2, including the following steps:

201. the terminal determines beams of a plurality of transmission layers, wherein the plurality of transmission layers comprise transmission layers with different using beam numbers;

202. the terminal sends CSI to network side equipment, wherein the CSI comprises beam index information, and the beam index information is used for indicating each transmission layer to use beams.

Wherein, the plurality of transmission layers may be greater than or equal to 3 transmission layers, for example: 3 or 4 transport layers. This may also support a higher rank (rank), i.e. feedback of a codebook supporting a higher rank.

In addition, the number of transmission layers is not limited herein, and the number of beams used by each transmission layer is also not limited. For example: the number of transmission layers may be 4 layers, layer 0, layer 1, layer 2 and layer 3, respectively, while the number of beams used by layer 0 and layer 1 may be 4 each, and the number of beams used by layer 2 and layer 3 may be 2 each.

The terminal may determine the beams of the plurality of transmission layers by determining the number of beams used by each transmission layer.

The above beam index information for indicating that each transmission layer uses a beam may be an explicit indication that each transmission layer uses a beam, for example: the beam index information includes a set of indexes of beams used by each transmission layer; alternatively, the above beam index information for indicating that each transmission layer uses the beam may implicitly indicate that each transmission layer uses the beam, for example: the beam index information includes a set of indexes of beams used by some transmission layers, and implicitly indicates a set of indexes of beams used by other transmission layers.

Through the above steps, since the plurality of transmission layers include transmission layers using different numbers of beams, the number of beams used by some transmission layers is less than the number of beams used by some transmission layers, so that when codebook feedback is performed by using the transmission layers, the overhead of codebook feedback can be reduced.

It should be noted that, in the embodiment of the present invention, the codebook fed back in the transmission layer may be a Type II codebook, that is, the embodiment of the present invention may reduce the feedback overhead of the Type II codebook and may support a higher rank. Thus, for a high rank Type II codebook, since a smaller number of beams are used for some transmission layers, low overhead Type II codebook feedback can be achieved and a higher rank is supported.

As an optional implementation manner, the plurality of transmission layers include at least one first type transmission layer and at least one second type transmission layer, where the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or by linearly combining a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

For example: the first type of transmission layer may be composed of four beams through linear combination, and the second type of transmission layer may be composed of one beam, or two or three beams through linear combination.

In addition, the terminal may classify the plurality of transmission layers into a first type transmission layer or a second type transmission layer by performing singular value decomposition on the channel matrix obtained by the measurement.

In addition, the number of the first type transmission layer and the second type transmission layer is not specifically limited, and the number of the first type transmission layer and the second type transmission layer may be the same. For example: the plurality of transport layers may include two transport layers of a first type and two transport layers of a second type. Of course, the number of the first type of transport layer and the second type of transport layer may also be different.

In this way, in this embodiment, since the plurality of transmission layers include at least one first type transmission layer and at least one second type transmission layer, by classifying the transmission layers, when determining the beam of each transmission layer, the terminal can respectively determine according to the type of each transmission layer, so that the terminal is more convenient in determining the beam used by each transmission layer.

In one implementation, the beam index information includes:

In the above beam index information, one set may indicate an index of a beam used by one transmission layer, and of course, if two transmission layers use the same beam, the indexes of the beams used by the two transmission layers may be indicated by one set. In addition, a set may also be referred to as a set of beam indices.

In this implementation, the beam index information includes: one or more first type transmission layers use a set of indices of beams; and, the one or more second type transmission layers use a set of indices of the beams. Only one set may be included since different transport layers use the same set. In this way, the content carried by the beam index information can be reduced, so that the overhead when the terminal sends the CSI to the network side device is relatively small.

As an optional implementation, the beam index information includes:

first and second beam index information;

The beams used by the plurality of transmission layers belong to a plurality of beams, and it is understood that each beam used by each of the plurality of transmission layers is a beam in the plurality of beams, for example: the first beam index information includes indexes of 6 beams, and the plurality of transmission layers include layer 0, layer 1, layer 2, and layer 3, wherein layer 0 uses 4 beams among the 6 beams, layer 1 similarly uses the 4 beams among the 6 beams, layer 2 uses 2 beams among the 6 beams, and layer 3 uses 2 beams among the 6 beams. It should be noted that there may be repeated beams used by different transmission layers, for example: the 2 beams used by layer 2 use some 2 of the 4 beams for layer 0.

The second beam index information may include a set of indexes of beams used by all or part of the plurality of transmission layers.

In this embodiment, since the beams used by the plurality of transmission layers belong to a plurality of beams, the first beam index information may be referred to as absolute beam index information, that is, the absolute beam index information includes indexes of the plurality of beams and is used to configure all the transmission layers. And the second beam index information may be referred to as relative beam index information, i.e., the relative beam index information is used to indicate one or more beams selected from the absolute beam index information for constituting one or more transmission layers.

Since each transmission layer is instructed to use a beam by the above-described first beam index information and second beam index information, it is possible to more accurately instruct each transmission layer to use a beam.

The plurality of transmission layers including all the transmission layers using the beam indicated by the first beam index information may be understood as one or more transmission layers using the plurality of beams indicated by the beam indicated by the first beam index information. Thus, the second beam index information comprises the indexes of the beams used by the transmission layers except the transmission layer, so that the signaling overhead can be saved.

In addition, in this embodiment, if there are transmission layers using the same beam, the transmission layers using the same beam in the second beam index information share a set of the same group of beam indexes, which can also save signaling overhead.

As an alternative implementation, the second type of transmission layer usage beam belongs to a part of the first type of transmission layer usage beams; or

In this embodiment, the beams used by the second type of transmission layer may belong to a part of the beams used by the first type of transmission layer, or the beams used by the second type of transmission layer are different from the beams used by the first type of transmission layer, so that the beams used by the second type of transmission layer are more diversified, and the flexibility is higher when the beams used by the second type of transmission layer.

As an optional implementation, the CSI further includes:

The type of the layer indication message is not limited herein, for example: the layer indication message may use a 4-bit bitmap (bitmap) form. If four transport layers are included, namely layer 0, layer 1, layer 2 and layer 3, and the content of the layer indication message is '1100', it means that layer 0 and layer 1 are the first type of transport layer, and layer 2 and layer 3 are the second type of transport layer.

It should be noted that, the network side device receives the layer indication information and the beam index information sent by the terminal, so that the precoding used by the network side device can be determined. Specifically, since the precoding used by the network side device has multiple parameters, after the network side device receives the layer indication information and the beam index information, the unique parameter can be determined according to the layer indication information and the beam index information, and the precoding that needs to be used is further determined.

In this way, since the CSI further includes the layer indication information, the network side device may determine precoding more accurately.

In one implementation, the information related to at least one of the first type of transport layer and the second type of transport layer includes: a layer index belonging to the first type of transport layer among the plurality of transport layers, and/or a layer index belonging to the second type of transport layer among the plurality of transport layers;

in this implementation, since the related information includes the layer index of the first type transmission layer and/or the layer index of the second type transmission layer, the network side device may determine the beams used by the first type transmission layer and the second type transmission layer more accurately.

In another implementation, the information related to at least one of the first type of transport layer and the second type of transport layer includes: a transport layer type to which each of the plurality of transport layers belongs;

in this implementation, since the related information may include the transmission layer types of the first type transmission layer and the second type transmission layer, the network side device may more accurately determine the types of beams used by the first type transmission layer and the second type transmission layer.

In another implementation, the information related to at least one of the first type of transport layer and the second type of transport layer includes: a number of the first type of transmission layers in the plurality of transmission layers, and/or a number of the second type of transmission layers in the plurality of transmission layers.

In this implementation manner, since the related information may include the numbers of the first type transmission layer and the second type transmission layer, the network side device may more accurately determine the numbers of the beams used by the first type transmission layer and the second type transmission layer.

In another implementation, the CSI includes at least two parts, and the terminal maps the layer indication information and the RI to the first part of the CSI.

The terminal may measure channel characteristics, and determine the RI according to the measured channel characteristics, for example: RI is determined to be 4, i.e., transmission layer 4, which can be expressed as layers 0-3, or RI can be determined to be 3, i.e., transmission layer 3, which can be expressed as layers 0-2.

In addition, the CSI includes a first part and a second part, wherein the first part may include an RI, layer indication Information, and may further include a Channel Quality Indicator (CQI), and the second part may include Precoding Matrix Information (PMI). In this way, since the CSI may include a plurality of items of information, overhead caused by multiple information transfers between the terminal and the network side device is reduced.

As an optional implementation manner, the number of beams used by the first type of transport layer is predefined or signaled by the network side device in a high layer, and/or the number of beams used by the second type of transport layer is predefined or signaled by the network side device in a high layer;

and/or the presence of a gas in the gas,

the structural relationship between the index of the beam used by the group of first type transmission layers and one or more transmission layers is predefined or signaled by the network side equipment high layer, and/or the structural relationship between the index of the beam used by the group of second type transmission layers and one or more transmission layers is predefined or signaled by the network side equipment high layer.

The above-mentioned construction relationship between the group of first type transmission layers using the index of the beam and one or more transmission layers may be understood as that the group of first type transmission layers using the index of the beam is used for constructing one or more transmission layers, for example: the indices of the beams used by a group of first type transmission layers comprise indices of 4 beams, and the 4 beams are used to form layer 0 and layer 1, i.e. the beams used by layer 0 and layer 1 are both the 4 beams.

Wherein, the above-mentioned construction relationship between the group of second type transmission layers using the index of the beam and one or more transmission layers may be understood as that the group of second type transmission layers using the index of the beam is used for constructing one or more transmission layers, for example: the indices of a group of second type transmission layer used beams comprise the indices of 2 beams, and then these 2 beams are used to form layer 2 and layer 3, i.e. both layer 2 and layer 3 used beams are these 2 beams.

In this embodiment, the number of beams used by the first type transmission layer and the second transmission layer, the number of transmission layers of the first type transmission layer and the second transmission layer, and the structural relationship between the index of the beam used by one group of the first type transmission layer or the second type transmission layer and one or more transmission layers may be predefined or notified by a network side device high-level signaling, so that the number of beams used by the first type transmission layer and the second transmission layer, the number of transmission layers of the first type transmission layer and the second transmission layer, and the structural relationship between the index of the beam used by one group of the first type transmission layer or the second type transmission layer and one or more transmission layers are all set, so that the terminal can directly obtain the information, and the working efficiency of the terminal can be improved.

Referring to fig. 3, fig. 3 is a flowchart of another CSI feedback method according to an embodiment of the present invention, as shown in fig. 3, including the following steps:

301. the method includes that network side equipment receives CSI sent by a terminal, wherein the CSI comprises beam index information, the beam index information is used for indicating beams used by each transmission layer in a plurality of transmission layers determined by the terminal, and the plurality of transmission layers comprise transmission layers with different using beam numbers.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

the method further comprises the following steps:

or,

and/or the presence of a gas in the gas,

It should be noted that, this embodiment is used as an implementation of the network side device corresponding to the embodiment shown in fig. 2, and specific implementation thereof may refer to the relevant description of the embodiment shown in fig. 2, so that, in order to avoid repeated description, the embodiment is not described again, and the same beneficial effects may also be achieved.

The following illustrates an embodiment of the present invention with a network side device as a base station:

the first embodiment is as follows:

1. the base station configures the terminal with a first type of transmission layer using L1-4 beams and a second type of transmission layer using L2-2 beams.

2. The terminal determines the rank RI to be 4 according to the measured channel characteristics, that is, the number of transmission layers is 4, which is expressed as layers 0 to 3. The terminal determines that layer 0 and layer 1 belong to a first type of transport layer and layer 2 and layer 3 belong to a second type of transport layer. The manner in which the transport layer is determined may be obtained by performing a singular value decomposition of the channel matrix.

3. The terminal determines L1-4 beams for layer 0, L1-4 beams for layer 1, L2-2 beams for layer 2, and L2-2 beams for layer 3.

4. The terminal feeds back 2 sets of beam indexes used by the first type transmission layer (each set includes indexes of 4 beams, L1), and 2 sets of beam indexes used by the second type transmission layer (each set includes indexes of 2 beams, L2).

5. While using a 4-bit bitmap as layer indication information, e.g., '1100', indicating that layer 0 and layer 1 are transport layers of the first type and layer 2 and layer 3 are transport layers of the second type.

6. And the base station receives the beam index and the layer indication information of each transmission layer and determines the precoding used by the base station side.

Example two:

the system predefines a set of beam indices used by the first type of transmission layer for multiple transmission layers (i.e., each layer belonging to the first type of transmission layer is linearly combined using the same L1 beams), a set of beam indices used by the second type of transmission layer is for multiple transmission layers, and L2 ≧ 2 (i.e., each layer belonging to the second type of transmission layer is linearly combined using the same L2 beams).

2. The terminal determines a rank of 4 according to the measured channel characteristics, that is, the number of transmission layers is 4, which is expressed as layers 0 to 3. The terminal determines that layer 0 and layer 1 belong to a first type of transport layer and layer 2 and layer 3 belong to a second type of transport layer. The manner in which the transport layer is determined may be obtained by performing a singular value decomposition of the channel matrix.

3. The terminal determines that layer 0 and layer 1 use 4 beams together with L1 and layer 2 and layer 3 use 2 beams together with L2.

4. The terminal feeds back 1 set of beam indexes (L1 ═ 4 beam indexes) used by the first type transmission layer and 1 set of beam indexes (L2 ═ 2 beam indexes) used by the second type transmission layer.

5. And simultaneously feeding back the number 2 of the transmission layers belonging to the first type of transmission layers as layer indication information.

Example three:

the system predefines a set of beam indices used by the first type of transport layer for multiple transport layers (i.e., each layer belonging to the first type of transport layer is linearly combined using the same L1 beams).

1. The base station configures the terminal with a first type of transmission layer using L1-4 beams and a second type of transmission layer using L2-1 beams.

3. The terminal determines L1-4 beams used in common by layer 0 and layer 1, L2-1 beam for layer 2, and L2-1 beam for layer 3.

4. The terminal feeds back 1 set of beam indexes (L1 ═ 4 beam indexes) used by the first type transmission layer and 2 sets of beam indexes (each set includes L2 ═ 1 beam indexes) used by the second type transmission layer.

5. And simultaneously feeding back the number 2 of the layers belonging to the first type of transmission layer as layer indication information.

Example four:

the system predefines a set of beam indices used by the first type of transport layer for multiple transport layers (i.e., each transport layer belonging to the first type of transport layer uses the same L1 beams for linear combining).

3. The terminal determines that L1 used in common for layer 0 and layer 1 is 4 beams, L2 for layer 2 is 1 beam, and L2 for layer 3 is 1 beam (in this case, the layer 2 beam, the layer 3 beam, and the layer 0/1 beam are different from each other).

4. The terminal feeds back 1 set of absolute beam indices, i.e., first beam index information, which contains indices of 6 beams (4 beams shared by layer 0/1 + 1 beam of layer 2 + 1 beam of layer 3).

5. The terminal feeds back 3 sets of relative beam indexes, i.e., second beam index information, in which the 1 st set of beam index information indicates 4 beams (e.g., indicates the first 4 beams thereof) in the absolute beam index for the construction of layer 0 and layer 1. The group 2 beam index indicates 1 beam in the absolute beam index (e.g., indicates the 5 th beam therein) for layer 2 construction. The 3 rd set of beam indices indicates 1 beam in the absolute beam index (e.g., indicates the 6 th beam therein) for layer 3 construction.

6. The terminal feeds back a 4-bit bitmap as layer indication information, such as '1100', indicating that layer 0 and layer 1 are transport layers of the first type and layer 2 and layer 3 are transport layers of the second type. According to the NR CSI feedback structure, CSI is divided into a first part (part1) and a second part (part2) for reporting. Part1 includes information such as RI and CQI, and part2 includes PMI information. The layer indication information fed back by the terminal is mapped to part1 for reporting.

7. And the base station receives the beam index and the layer indication information of each transmission layer and determines the precoding used by the base station side.

Example five:

the system predefines that the beams used by the second type of transport layer belong to the beams used by the first type of transport layer.

2. The terminal determines the rank to be 4 according to the measured channel characteristics, that is, the transmission layer is 4, which is expressed as layers 0 to 3. The terminal determines that layer 0 and layer 1 belong to a first type of transport layer and layer 2 and layer 3 belong to a second type of transport layer. The manner in which the transport layer is determined may be obtained by performing a singular value decomposition of the channel matrix.

3. The terminal determines L1-4 beams, where both layer 0 and layer 1 use this L1-4 beams. Layer 2 uses 1 of the 4 beams and layer 3 uses 1 of the 4 beams.

4. The terminal feeds back 1 set of absolute beam indices, which contains indices of 4 beams. This absolute beam index is used for layer 0 and layer 1 construction.

5. The terminal feeds back 2 sets of relative beam indexes, wherein the 1 st set of beam indexes indicates 1 beam (e.g., indicates the 2 nd beam thereof) in the absolute beam index for the layer 2 construction. The 2 nd set of beam indices indicates 1 beam in the absolute beam index (e.g., indicates the 3 rd beam therein) for layer 3 construction.

6. The terminal feeds back layer indexes 2 and 3 belonging to the second type transport layer as layer indication information.

Example six:

2. The terminal determines the rank RI to be 3 according to the measured channel characteristics, that is, the transmission layer is 3, which is expressed as layers 0 to 2. The terminal determines that layer 0 belongs to the first type of transport layer and that layer 1 and layer 2 belong to the second type of transport layer. The manner in which the transport layer is determined may be obtained by performing a singular value decomposition of the channel matrix.

3. The terminal determines L1-4 beams, where layer 0 uses this L1-4 beams. Layer 1 and layer 2 share 2 of these 4 beams.

4. The terminal feeds back 1 set of absolute beam indices, which contains indices of 4 beams. This absolute beam index is used for layer 0 construction.

5. The terminal feeds back 1 set of relative beam indices indicating 2 beams (e.g., indicating 2, 3 beams among them) in the absolute beam index for layer 1 and layer 2 construction.

6. The terminal feeds back layer indexes 1 and 2 belonging to the second type transport layer as layer indication information.

As can be seen from the above embodiments, the embodiments of the present invention can be implemented as follows:

a terminal side:

1. the terminal feeds back one or more sets of beam indexes used by the first type transmission layer and one or more sets of beam indexes used by the second type transmission layer, or,

the terminal feeds back a set of absolute beam indices and one or more sets of relative beam indices.

2. The first type transmission layer is formed by linearly combining a plurality of beams, and the second type transmission layer is formed by one beam or a plurality of beams; or,

the beam indexes used by the group of first-type transmission layers comprise indexes of a plurality of beams and are used for one transmission layer; the beam indexes used by the group of second type transmission layers comprise indexes of one or more beams for one transmission layer; or,

the set of absolute beam indices contains indices of a plurality of beams for constituting all transmission layers; the set of relative beam indices is used to indicate one or more beams selected from the set of absolute beam indices for forming one or more transmission layers.

3. The terminal also feeds back layer indication information.

4. The layer indication information is a layer index feeding back a layer belonging to a first type of transport layer and/or a layer index belonging to a second type of transport layer,

and/or the presence of a gas in the gas,

the layer indication information indicates each transport layer as a first type of transport layer or a second type of transport layer,

and/or the presence of a gas in the gas,

the layer indication information indicates the number of the first type of transmission layers and/or the number of the second type of transmission layers.

5. And the layer indication information and the RI are jointly located in the first part of the CSI for reporting.

A base station side:

1. the system predefines or indicates the number of beams used by the first type of transmission layer L1 and/or the number of beams used by the second type of transmission layer L2 through high-layer signaling;

and/or the presence of a gas in the gas,

the system indicates the number of the first type of transport layers and/or the number of the second type of transport layers either predefined or by higher layer signaling,

and/or the presence of a gas in the gas,

the system predefines a constructed relationship of beam indexes used by a group of first type transmission layers or a group of second type transmission layers and one or more transmission layers;

2. and the base station receives the beam indication information and the layer indication information of each layer and determines the precoding used by the base station side.

The embodiments of the present invention can also achieve the effects of the above embodiments, and details are not described herein. I.e. the overhead of codebook feedback can be reduced as well.

Referring to fig. 4, fig. 4 is a structural diagram of a terminal according to an embodiment of the present invention, and as shown in fig. 4, the terminal 400 includes:

a determining module 401, configured to determine beams of multiple transmission layers, where the multiple transmission layers include transmission layers using different numbers of beams;

a sending module 402, configured to send CSI to a network side device, where the CSI includes beam index information, and the beam index information is used to indicate that each transmission layer uses a beam.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

or,

and/or the presence of a gas in the gas,

It should be noted that, in this embodiment, the terminal 400 may be any implementation manner of the method embodiment in the present invention, and any implementation manner of the terminal in the method embodiment in the present invention may be implemented by the terminal 400 in this embodiment, and achieve the same beneficial effects, which is not described herein again.

Referring to fig. 5, fig. 5 is a structural diagram of a network side device according to an embodiment of the present invention, and as shown in fig. 5, the network side device 600 includes:

a receiving module 501, configured to receive CSI sent by a terminal, where the CSI includes beam index information, where the beam index information is used to indicate a beam used by each of a plurality of transmission layers determined by the terminal, and the plurality of transmission layers include transmission layers using different numbers of beams.

The plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes: layer indication information, wherein the layer indication information is used for indicating related information of at least one of the first type of transmission layer and the second type of transmission layer;

referring to fig. 6, the network side device 500 further includes: a determining module 502, configured to determine precoding according to the beam index information and the layer indication information.

or,

and/or the presence of a gas in the gas,

It should be noted that, in this embodiment, the network-side device 500 may be a network-side device according to any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device 500 in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Referring to fig. 7, fig. 7 is a structural diagram of another terminal according to an embodiment of the present invention, and as shown in fig. 7, the terminal includes: a transceiver 710, a memory 720, a processor 700, and a program stored on the memory 720 and executable on the processor 700, wherein:

the processor 700 is configured to determine beams of a plurality of transmission layers, where the plurality of transmission layers include transmission layers using different numbers of beams;

the transceiver 710 is configured to transmit CSI to a network side device, where the CSI includes beam index information, where the beam index information is used to indicate that each transmission layer uses a beam;

or,

the transceiver 710 is configured to determine beams of a plurality of transmission layers, where the plurality of transmission layers include transmission layers using different numbers of beams;

the transceiver 710 is further configured to transmit CSI to a network side device, where the CSI includes beam index information, and the beam index information is used to indicate that each transmission layer uses a beam.

The transceiver 710 may be used for receiving and transmitting data under the control of the processor 700.

In FIG. 7, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 700 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 710 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 700 in performing operations.

It should be noted that the memory 720 is not limited to being on the terminal, and the memory 720 and the processor 700 may be separated in different geographical locations.

Optionally, the beam index information includes:

first and second beam index information;

or,

and/or the presence of a gas in the gas,

It should be noted that, in this embodiment, the terminal may be a terminal in any implementation manner in the method embodiment of the present invention, and any implementation manner of the terminal in the method embodiment of the present invention may be implemented by the terminal in this embodiment, so as to achieve the same beneficial effects, and details are not described here again.

Referring to fig. 8, fig. 8 is a structural diagram of another network-side device according to an embodiment of the present invention, and as shown in fig. 8, the network-side device includes: a transceiver 810, a memory 820, a processor 800, and a program stored on the memory 820 and executable on the processor, wherein:

the transceiver 810 is configured to receive CSI sent by a terminal, where the CSI includes beam index information, where the beam index information is used to indicate a beam used by each of a plurality of transmission layers determined by the terminal, and the plurality of transmission layers include transmission layers using different numbers of beams.

Transceiver 810 may be used, among other things, to receive and transmit data under the control of processor 800.

In fig. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together, particularly one or more processors represented by processor 800 and memory represented by memory 820. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 810 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 may store data used by the processor 800 in performing operations.

It should be noted that the memory 820 is not limited to be on a network-side device, and the memory 820 and the processor 800 may be separated in different geographical locations.

Optionally, the beam index information includes:

first and second beam index information;

Optionally, the CSI further includes:

processor 800 or transceiver 810 may also be configured to determine precoding based on the beam index information and the layer indication information.

or,

and/or the presence of a gas in the gas,

It should be noted that, in this embodiment, the network-side device may be a network-side device in any implementation manner in the method embodiment of the present invention, and any implementation manner of the network-side device in the method embodiment of the present invention may be implemented by the network-side device in this embodiment, so as to achieve the same beneficial effects, and details are not described here.

Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the CSI feedback method on the terminal side provided in the embodiments of the present invention, or the computer program, when executed by the processor, implements the steps in the CSI feedback method on the network side device side provided in the embodiments of the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be physically included alone, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute some steps of the processing method of the information data block according to various embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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 method for feeding back Channel State Information (CSI), comprising:

2. The method of claim 1, wherein the plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

3. The method of claim 2, wherein the beam index information comprises:

4. The method of claim 1 or 2, wherein the beam index information comprises:

first and second beam index information;

5. The method of claim 4, wherein the second beam index information includes an index of a beam used by a transmission layer other than the transmission layer, if the plurality of transmission layers includes transmission layers using all beams indicated by the beam used by the first beam index information; or

6. The method of claim 2, wherein the second type of transport layer usage beam belongs to a partial beam among the first type of transport layer usage beams; or

7. The method of claim 2, wherein the CSI further comprises:

8. The method of claim 7, wherein the information related to at least one of the first type of transport layer and the second type of transport layer comprises:

or,

9. The method of claim 7, wherein the CSI comprises two parts, and wherein the terminal maps the layer indication information and rank indication, RI, to a first part of the CSI.

10. The method of claim 2, wherein the number of beams used by the first type of transport layer is predefined or signaled by the network side device in a high layer manner, and/or the number of beams used by the second type of transport layer is predefined or signaled by the network side device in a high layer manner;

and/or the presence of a gas in the gas,

11. A CSI feedback method, comprising:

12. The method of claim 11, wherein the plurality of transmission layers comprises at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

13. The method of claim 12, wherein the beam index information comprises:

14. The method of claim 11 or 12, wherein the beam index information comprises:

first and second beam index information;

15. The method of claim 14, wherein the second beam index information includes an index of a beam used by a transmission layer other than the transmission layer, if the plurality of transmission layers includes transmission layers using all beams indicated by the beam used by the first beam index information; or

16. The method of claim 12, wherein the second type of transport layer usage beam belongs to a partial beam among the first type of transport layer usage beams; or

17. The method of claim 12, wherein the CSI further comprises:

the method further comprises the following steps:

18. The method of claim 17, wherein the information related to at least one of the first type of transport layer and the second type of transport layer comprises:

or,

19. The method of claim 17, wherein the CSI comprises two parts, a first part of the CSI being mapped with the layer indication information and RI.

20. The method of claim 12, wherein the first type of transport layer uses a predefined number of beams or the network side device high layer signaling to notify the terminal, and/or wherein the second type of transport layer uses a predefined number of beams or the network side device high layer signaling to notify the terminal;

and/or the presence of a gas in the gas,

21. A terminal, comprising:

22. The terminal of claim 21, wherein the plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

23. The terminal of claim 22, wherein the beam index information comprises:

24. The terminal of claim 21 or 22, wherein the beam index information comprises:

first and second beam index information;

25. The terminal of claim 22, wherein the CSI further comprises:

26. A network-side device, comprising:

27. The network-side device of claim 26, wherein the plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by linearly combining one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

28. The network-side device of claim 27, wherein the beam index information comprises:

29. The network-side device of claim 26 or 27, wherein the beam index information comprises:

first and second beam index information;

30. The network-side device of claim 27, wherein the CSI further comprises:

the network side device further includes:

31. A terminal, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

or,

32. The terminal of claim 31, wherein the plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

33. The terminal of claim 32, wherein the beam index information comprises:

34. The terminal of claim 31 or 32, wherein the beam index information comprises:

first and second beam index information;

35. The terminal of claim 32, wherein the CSI further comprises:

36. A network-side device, comprising: a transceiver, a memory, a processor, and a program stored on the memory and executable on the processor,

37. The network-side device of claim 36, wherein the plurality of transmission layers comprise at least one first type transmission layer and at least one second type transmission layer, wherein the first type transmission layer is formed by linearly combining a plurality of beams, the second type transmission layer is formed by linearly combining one beam or a plurality of beams, and the number of beams used by the first type transmission layer is different from the number of beams used by the second type transmission layer.

38. The network-side device of claim 37, wherein the beam index information comprises:

39. The network-side device of claim 36 or 37, wherein the beam index information comprises:

first and second beam index information;

40. The network-side device of claim 37, wherein the CSI further comprises:

the processor or the transceiver is further configured to determine precoding according to the beam index information and the layer indication information.

41. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps in the CSI feedback method according to one of claims 1 to 10, or which, when being executed by a processor, carries out the steps in the CSI feedback method according to one of claims 11 to 20.