WO2017193991A1

WO2017193991A1 - Codebook configuration selection method and electronic device executing same

Info

Publication number: WO2017193991A1
Application number: PCT/CN2017/084101
Authority: WO
Inventors: 李慧玲; 那崇宁; 蒋惠玲; 柿岛佑一; 永田聪
Original assignee: 株式会社Ntt都科摩
Priority date: 2016-05-12
Filing date: 2017-05-12
Publication date: 2017-11-16
Also published as: JP6679756B2; JP2019521559A; CN109478911B; CN107370523A; CN109478911A

Abstract

Proposed are a codebook configuration selection method executed by an electronic device, and an electronic device. The electronic device has a plurality of beam levels. The method comprises: when a beam level used by an electronic device changes from a first beam level to a second beam level from among a plurality of beam levels, determining a candidate beam and a mother codebook of the second beam level from beams that can be used by the electronic device; and according to a detection result of the candidate beam, selecting a codebook configuration from the mother codebook of the second beam level, wherein the mother codebook of the second beam level is obtained by zooming a mother codebook of the first beam level.

Description

Method for selecting codebook configuration and electronic device for performing the same

Technical field

The present invention relates to a wireless communication system, and more particularly to a method of selecting a codebook configuration performed by an electronic device in a wireless communication system and an electronic device performing the same.

Background technique

In a current wireless communication system such as LTE (Long Term Evolution), a precoding matrix codebook is stored in advance in a radio base station (BS) and a mobile station (UE), and is pre-selected according to a channel state of the mobile station or the like. The memory codebook selects the codeword that the mobile station will use to communicate with the wireless base station. In order to be able to quickly and efficiently select a codeword to be used by a mobile station to communicate with a wireless base station from a pre-stored codebook, in a future wireless communication system such as LTE-Advanced LTE-Advanced (LTE-A), A method of first screening the codewords in the codebook and further selecting the codewords to be used by the mobile station from the initially selected codewords has been proposed.

In addition, in consideration of compatibility with various application scenarios, different codebook configurations of the precoding matrix mother codebook and the mother codebook may be used to generate different codebooks for different application scenarios. Specifically, the mother codebook is stored in advance in the wireless base station and the mobile station. The radio base station can appoint a codebook that can be used by the radio base station and the mobile station in the actual data transmission process according to the actual situation, and the codebook configuration can be a subset of the mother codebook. The wireless base station transmits the codebook configuration information to the mobile station to enable the mobile station to correctly generate the codebook configuration.

In Rel-13, a codebook supporting 1, 2, 4, 8, 12, and 16 CSI-RS antenna ports is proposed. In Rel-14, the number of supported CSI-RS antenna ports reaches 20, 24, 28, and 32. Therefore, a codebook supporting the number of corresponding antenna ports of Rel-14 is required. In addition, in the prior art codebook, the codebooks for different antenna port numbers are independent of each other, and as the number of antenna ports increases, this further increases the operational complexity of the BS and the UE.

Summary of the invention

According to an aspect of the present invention, there is provided a method of selecting a codebook configuration performed by an electronic device, wherein the electronic device has a plurality of beam levels, the method comprising: when the electronic device uses a beam level from Changing the first beam level of the plurality of beam levels to the second beam Level, a candidate code beam and a mother codebook of the second beam level are determined in a beam that can be used by the electronic device; and a mother codebook from the second beam level according to a detection result of the candidate beam Selecting a codebook configuration, wherein the mother codebook of the second beam level is obtained by scaling a mother codebook of the first beam level.

According to another aspect of the present invention, there is provided an electronic device having a plurality of beam levels, the electronic device comprising: a mother codebook determining unit configured to use a beam level of the electronic device from the plurality of Determining a candidate beam and a mother codebook of the second beam level in a beam that can be used by the electronic device when the first beam level of the beam levels is changed to a second beam level; and a codebook configuration selection unit, configuring Selecting a codebook configuration from a mother codebook of the second beam level according to a detection result of the candidate beam, wherein a mother codebook of the second beam level is a mother code for the first beam level This is obtained by scaling.

The selection method and electronic device of the codebook configuration according to the above aspect of the present invention provide a codebook which not only supports the number of antenna ports of Rel-14 but also has backward compatibility with the number of antenna ports (available from Rel-13 smooth extension) and forward compatibility (can be further extended to prepare for subsequent versions), and can take care of UEs working in different versions of the communication network.

DRAWINGS

The above and other aspects, features and advantages of certain embodiments of the present invention will become more apparent from

1 is a flowchart of a method of selecting a codebook configuration performed by an electronic device, in accordance with an embodiment of the present invention;

2 is a diagram showing a beam raster of determining candidate beams from beams that can be used by an electronic device when beam levels are level 2 and level 3 corresponding to 16, 32 antenna ports, respectively, in accordance with an embodiment of the present invention;

3 is a diagram showing a mother codebook corresponding to different levels of antenna ports, in accordance with an embodiment of the present invention;

4 is a diagram of a codebook configuration for beam level 1, beam level 2, and beam level 3 corresponding to 8, 16, and 32 antenna ports, respectively, in accordance with an embodiment of the present invention;

Figure 5 is a block diagram of an electronic device in accordance with an embodiment of the present invention.

detailed description

Embodiments of the present invention will be described below with reference to the drawings. The following description with reference to the accompanying drawings will be understood to It includes various specific details to help understanding, but they can only be considered as exemplary. Accordingly, it will be appreciated by those skilled in the art that various modifications and changes may be made to the embodiments described herein without departing from the scope and spirit of the invention. Further, detailed descriptions of well-known functions and constructions in the art are omitted for clarity and conciseness.

For ease of understanding, the terms mentioned in the following description are explained. In the embodiment of the present invention, one or more mother codebooks are pre-stored in the transmitting end and the receiving end, wherein each of the mother codebooks includes a plurality of codewords, and the codebook configuration of each mother codebook is the mother A subset of the codebook. More specifically, the codewords included in each codebook configuration are a subset of the codewords contained in the master codebook to which the codebook configuration belongs. The mother codebook may correspond to an antenna beam array used in an electronic device such as a base station. And the mother codebook and the codebook configuration can be represented by a raster map representing the beams that the electronic device can use.

1 is a flow chart of a method of selecting a codebook configuration performed by an electronic device in accordance with an embodiment of the present invention. An electronic device may have multiple beam levels, with different beam levels corresponding to different antenna port numbers. For example, 8 antenna ports correspond to beam level 1, 16 antenna ports correspond to beam level 2, and 32 antenna ports correspond to beam level 3. However, the above is merely an example, and embodiments of the present invention are not limited thereto.

When the beam level used by the electronic device is changed from the first beam level to the second beam level of the plurality of beam levels, in step S101, the candidate beam and the mother code of the second beam level are determined in the beam that can be used by the electronic device. this. According to one example of the invention, the candidate beam may be indicated by a candidate beam index. It is determined in step S101 that the mother codebook corresponds to the determined candidate beam. The electronic device can obtain a candidate beam index of the determined candidate beam. For example, when the electronic device is a base station, the base station may generate a candidate beam index corresponding to the determined candidate beam. For another example, when the electronic device is a mobile station, the mobile station can receive control signaling transmitted from the base station to obtain a candidate beam index.

2 is a diagram showing beam rasters for determining candidate beams from beams that can be used by an electronic device when the beam levels are level 2 and level 3, respectively, corresponding to 16, 32 antenna ports, in accordance with an embodiment of the present invention. In the example shown in FIG. 2, the first beam level is beam level 2 corresponding to 16 antenna ports, and the second beam level is beam level 3 corresponding to 32 antenna ports. figure 2 The grid 210 in the middle represents the beam that the electronic device can use in beam level 2. Grid 220 in FIG. 2 represents a beam that the electronic device can use in beam level 3.

The description will be made in the example shown in FIG. 2 that the electronic device is a base station, but the present invention is not limited thereto. As shown in FIG. 2, when communicating using the level 2 antenna beam, the base station transmits data to the mobile station using the antenna beams represented by the eight grids shown in the dashed box of the grid 210.

When the beam level used by the base station is changed from beam level 2 to beam level 3, the candidate beam and the second are determined in the beam that the base station can use in the beam level 3 (ie, in the beam represented by the grid 220) according to step S101. The mother codebook of the beam level.

Preferably, according to an example of the present invention, all the beams corresponding to the mother codebook of each beam level cover the same area. In a communication system, when the number of antennas used by a base station increases, the coverage area of a single beam becomes small. Therefore, in order to make the areas covered by all the beams corresponding to the mother codebooks of the respective beam levels the same, the mother codebook having a higher beam level (ie, a beam level containing more beams) includes a beam ratio having a lower beam. The mother codebook of the level (ie, the beam level containing fewer beams) contains more beams.

In this example, the level 2 master codebook contains 8 beams (eg, the antenna beams represented by the 8 grids shown in the dashed box of grid 210), while the level 3 master codebook contains 16 beams. (For example, the antenna beam represented by the 16 grids shown in the dashed box of the grid 220), so that the area of all the beam coverage corresponding to the level 3 master codebook and the beam coverage corresponding to the level 2 master codebook The area is the same.

Furthermore, after the beam level used by the base station is changed from beam level 2 to beam level 3, as described above, the candidate beam index of the determined candidate beam can be obtained. According to one example of the invention, the candidate beam index may be an absolute index. Alternatively, according to another example of the present invention, the candidate beam index may also be a relative index.

Specifically, when changing from the first beam level to the second beam level, the candidate beam index may be an absolute index of the candidate beam. The absolute index may be the position of the first of the candidate beams in the beam raster map. For example, if 12 sets of candidate beams are included in the second beam level, each set of candidate beams may be indicated by indices 0, 1, 2, ..., 11, respectively.

However, when changing from the first beam level to the second beam level, the position of the corresponding candidate beam does not change too much. Therefore, alternatively, to save signaling overhead, the candidate beam index may include a base index and an index offset. The base index indicates the bit of the base beam in the first beam level The base index does not normally change when changing from the first beam level to the second beam level, so there is no need to send a base index. The index offset indicates an offset from the position of the base beam. The offset can be in units of beams in the second beam level. For example, the value of the index offset can be -2, -1, 0, 1, and so on. Taking the grid diagram 220 of level 3 in FIG. 2 as an example, when the candidate beam is a beam included in the dashed box in the trellis diagram 220 of level 3, the position of the corresponding candidate beam can be represented as a trellis diagram 210 of level 2 Based on the position indicated by the dashed box, the beam in one level 3 is moved to the right. In this case, the index offset can be indicated by a value of "1".

The hatched portion in Fig. 2 indicates the first candidate beam in level 2, including 8 grids, and the shaded hatched portion indicates the second candidate beam in level 2, also including 8 grids, and the color in Fig. 2 is the most The heavy shaded portion represents the overlapping beams between the candidate beams determined by the two adjacent candidate beam indices.

As shown in FIG. 2, in level 2, the distance between the starting positions of adjacent two sets of candidate beams is two beams in level 2, which is equivalent to the beams in four levels 3. Therefore, in level 3, 2 bits can be used to indicate the index offset, for example, 00 means -2, 01 means -1, 11 means 0, and 10 means 1. Thereby the offset distance of the candidate beam relative to the position of the base beam in level 2 in level 3 is indicated.

According to the invention, the mother codebook of the second beam level is obtained by scaling the mother codebook of the first beam level.

According to another example of the present invention, the mother codebook of the second beam level may be obtained by scaling the mother codebook of the first beam level in the horizontal and/or vertical direction.

For example, when the number of antenna ports included in the second beam level is greater than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is at the level of the mother codebook of the first beam level. And extending in the vertical direction; when the number of antenna ports included in the second beam level is less than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is the first beam The master codebook of the grade is obtained by reducing in the horizontal and / or vertical direction.

3 is a diagram showing a mother codebook corresponding to different levels of antenna ports, in accordance with an embodiment of the present invention. It can be seen from FIG. 3 that the mother codebook of beam level 2 is obtained by expanding the mother codebook of beam level 1 in the horizontal and/or vertical direction, and the mother codebook of beam level 3 is the mother of beam level 2. The codebook is obtained by expanding in the horizontal and / or vertical direction. In contrast, the mother codebook of beam level 2 is obtained by reducing the mother codebook of beam level 3 in the horizontal and / or vertical direction. The mother codebook of beam level 1 is the horizontal codebook of the beam level 2 / or reduced in the vertical direction Got it.

Specifically, the mother codebook of level 2a is obtained by expanding the mother codebook of level 1 by 2 times in the horizontal direction, and the mother codebook of level 2b is obtained by expanding the mother codebook of level 1 by 2 times in the vertical direction. . The mother codebook of level 3a is obtained by expanding the mother codebook of level 2a by a factor of 2 in the horizontal direction, and the master codebook of level 3b is for expanding the parent codebook of level 2a by 2 times in the vertical direction or for the level 2b. The mother codebook is extended by 2 times in the horizontal direction. In contrast, the mother codebook of level 2a is obtained by reducing the mother codebook of level 3a by 1/2 in the horizontal direction or by reducing the master codebook of level 3b by 1/2 in the vertical direction, and the mother codebook of level 2b is The master codebook of level 3b is obtained by reducing 1/2 in the horizontal direction. The master codebook of level 1 is obtained by reducing the mother codebook of level 2a by 1/2 in the horizontal direction or by reducing the mother codebook of level 2b by 1/2 in the vertical direction.

In this case, the electronic device can also indicate changes in the beam level by parameters. For example, the electronic device may determine a level indication parameter, where the level indication parameter indicates whether the number of antenna ports included in the second beam level is greater or less than the number of antenna ports included in the first beam level; and determining a direction indication parameter, a direction indication parameter The mother codebook indicating the second beam level is scaled in the horizontal direction or the vertical direction of the mother codebook of the first beam level.

Table 1 below shows an embodiment of a level indicating parameter and a direction indicating parameter. However, this is merely an example, and embodiments of the present invention are not limited thereto. The level indication parameter facilitates compatibility between the high-level BS and the low-level BS (UE), and facilitates smooth level change. The direction indication parameter combines antenna extension and codebook extension with low overhead.

Table 1

For example, when the beam level is changed from level 2a in FIG. 3 to level 3a, the electronic device may determine the level indication parameter as 1 and the direction indication parameter as 0.

Referring back to FIG. 1, in step S102, the electronic device selects a codebook configuration from the mother codebook of the second beam level based on the detection result of the candidate beam.

The mother codebook of the first beam level may be the same as the specific codebook configuration in the codebook configuration contained in the mother codebook of the second beam class. Before performing the step S102 of FIG. 2, the electronic device selects the specific codebook configuration as an initial codebook configuration after changing to the second beam level, and loads the determined mother codebook of the second beam level, and step S202 includes For the detection result of the candidate beam, a codebook configuration is selected from the loaded mother codebook of the second beam level to replace the initial codebook configuration.

When the number of antenna ports included in the second beam level is greater than the number of antenna ports included in the first beam level, at least a portion of each codebook configuration included in the mother codebook of the second beam level is for the first The codebook configuration of the beam-level master codebook is obtained by spreading in the horizontal and/or vertical direction.

4 is a design of a codebook configuration for beam level 1, beam level 2, and beam level 3 corresponding to 8, 16, and 32 antenna ports, respectively, in accordance with an embodiment of the present invention. As can be seen from FIG. 4, the mother codebook of level 1 is the same as the codebook configuration 2 included in the mother codebook of level 2a and the codebook configuration 4 included in the mother codebook of level 2b; the mother codebook and level of level 2 The codebook configuration included in the mother codebook of 3a and the codebook configuration 4 included in the master codebook of level 3b are the same. For example, when the beam level used by the electronic device is changed from level 2a to level 3a, the electronic device selects the codebook configuration 2 as the initial codebook configuration after changing to level 3a, and loads the determined master codebook of level 3a, according to For the detection result of the candidate beam, a codebook configuration is selected from the loaded mother codebook to replace the codebook configuration 2. For another example, when the beam level used by the electronic device is changed from level 2a to level 3b, the electronic device selects the codebook configuration 4 as the initial codebook configuration after changing to level 3b, and loads the determined master codebook of level 3b, According to the detection result of the candidate beam, a codebook configuration is selected from the loaded mother codebook to replace the codebook configuration 4. And so on.

As can be seen from FIG. 4, in terms of codebook configuration, at least a portion of each codebook configuration included in the master codebook of level 2a, 2b is level and/or configured for the codebook configuration contained in the master codebook of level 1. Obtained in the vertical direction. At least a portion of each of the codebook configurations included in the master codebooks of levels 3a, 3b is obtained by horizontally and/or vertically expanding the codebook configurations contained in the master codebooks of levels 2a, 2b, respectively.

The method for selecting a codebook configuration according to the present invention provides a codebook that not only supports the number of antenna ports of Rel-14, but also has backward compatibility with the number of antenna ports (can be smoothly extended from Rel-13) ) and forward compatibility (can be further extended to prepare for subsequent versions), and can take care of different versions of UEs operating in the communication network.

5 is a block diagram of an electronic device having multiple beam levels, in accordance with an embodiment of the present invention. Referring to FIG. 5, the electronic device includes: a mother codebook determining unit configured to be capable of using a beam at an electronic device when a beam level used by the electronic device is changed from a first beam level of a plurality of beam levels to a second beam level Determining a candidate beam and a mother codebook of the second beam level; and a codebook configuration selecting unit configured to select a codebook configuration from the mother codebook of the second beam level according to the detection result of the candidate beam.

For example, an electronic device according to an embodiment of the present invention may be a base station. When the beam level used by the base station is changed from the first beam level to the second beam level, the mother codebook determining unit in the base station selects the candidate beam among the beams that the base station can use, and determines the mother codebook and the candidate of the second beam level. The beam configuration corresponds to: the codebook configuration selection unit in the base station selects a codebook configuration from the mother codebook of the second beam level according to the detection result of the candidate beam by the UE.

As another example, an electronic device in accordance with an embodiment of the present invention may be a UE. When the beam level is changed from the first beam level to the second beam level, the mother codebook determining unit of the UE determines the candidate beam and the mother codebook of the second beam level according to the notification of the base station; the codebook configuration selection unit of the UE is configured according to the pair As a result of the detection of the candidate beam, the codebook configuration is selected from the mother codebook of the second beam level to be fed back to the base station.

According to one example of the invention, the candidate beam may be indicated by a candidate beam index. The electronic device may further include an index obtaining unit configured to obtain a candidate beam index indicating the determined candidate beam. For example, when the electronic device is a base station, the index obtaining unit may generate a candidate beam index corresponding to the determined candidate beam. For another example, when the electronic device is a mobile station, the mobile station can receive control signaling transmitted from the base station to obtain a candidate beam index.

According to one example of the invention, the candidate beam index may be an absolute index. Alternatively, according to another example of the present invention, the candidate beam index may also be a relative index.

Specifically, when changing from the first beam level to the second beam level, the candidate beam index may be an absolute index of the candidate beam. The absolute index may be the position of the first of the candidate beams in the beam raster map.

However, when changing from the first beam level to the second beam level, the position of the corresponding candidate beam does not change too much. Therefore, alternatively, to save signaling overhead, the candidate beam index may include a base index and an index offset. The base index indicates the location of the base beam in the first beam level, and the base index typically does not change when changing from the first beam level to the second beam level, so there is no need to send a base index. The index offset indicates an offset from the position of the base beam. The offset can be a unit of the beam in the second beam level. For example, the value of the index offset can be -2, -1, 0, 1, and so on.

In this case, the electronic device can also indicate changes in the beam level by parameters. For example, the electronic device may further include a level determining unit configured to determine a level indicating parameter, the level indicating parameter indicating whether the number of antenna ports included in the second beam level is more or less than the number of antenna ports included in the first beam level; The direction determining unit is configured to determine a direction indication parameter, where the direction indication parameter indicates that the mother codebook of the second beam level is to scale the mother codebook of the first beam level in a horizontal direction or a vertical direction. Table 1 above shows an embodiment of a level indicating parameter and a direction indicating parameter. However, this is merely an example, and embodiments of the present invention are not limited thereto.

According to another example of the present invention, the mother codebook of the first beam level may be the same as the specific codebook configuration in the codebook configuration included in the mother codebook of the second beam class.

For example, the electronic device may further include: an initial codebook obtaining unit configured to select the specific codebook configuration as the codebook configuration before selecting the codebook configuration from the mother codebook of the second beam level according to the detection result of the candidate beam Change to the initial codebook configuration after the second beam level. The electronic device may further include a loading unit configured to load the determined second code level master codebook, wherein the codebook configuration unit selects from the loaded second beam level master codebook according to the detection result of the candidate beam. The codebook is configured to replace the initial codebook configuration.

The electronic device according to the present invention provides a codebook which not only supports the number of antenna ports of Rel-14, but also has backward compatibility with the number of antenna ports (smooth expansion from Rel-13) and forward direction Compatibility (can be further extended to prepare for subsequent releases) and can take care of different versions of UEs operating in the communication network.

Those skilled in the art will appreciate that the various elements and steps described in connection with the embodiments of the present invention can be implemented in electronic hardware, computer software, or a combination of both. And the software module can be placed in any form of computer storage medium. For example, the functions implemented by the mother codebook determining unit, the codebook configuration determining unit included in the electronic device of FIG. 5 may be performed by a processor (for example, a CPU).

To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. Those skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

While the invention has been shown and described with reference to the embodiments of the embodiments of the embodiments of the invention Various changes on it.

Claims

A method of selecting a codebook configuration performed by an electronic device, wherein the electronic device has a plurality of beam levels, the method comprising:

Determining a candidate beam and the second beam level in a beam that can be used by the electronic device when a beam level used by the electronic device changes from a first beam level to a second beam level of the plurality of beam levels Mother codebook; and

Selecting a codebook configuration from a mother codebook of the second beam level according to a detection result of the candidate beam, where

The mother codebook of the second beam level is obtained by scaling the mother codebook of the first beam level.
The method of claim 1 further comprising:

Obtaining a candidate beam index indicating the determined candidate beam, wherein

The candidate beam index includes a base index and an index offset,

The base index indicates a location of a base beam in the first beam level,

The index offset indicates an offset from a position of the base beam.
The method of claim 1 wherein

The mother codebook of the second beam level is obtained by scaling the mother codebook of the first beam level in a horizontal and/or vertical direction.
The method of claim 3 wherein

When the number of antenna ports included in the second beam level is greater than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is a mother of the first beam level The codebook is extended in the horizontal and / or vertical direction;

When the number of antenna ports included in the second beam level is smaller than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is a mother of the first beam level The codebook is obtained by reducing it in the horizontal and/or vertical direction.
The method of claim 4 further comprising:

Determining a level indication parameter, the level indication parameter indicating whether the number of antenna ports included in the second beam level is greater or less than the number of antenna ports included in the first beam level;

Determining a direction indication parameter, the direction indication parameter indicating a mother codebook of the second beam level Whether the mother codebook of the first beam level is scaled in the horizontal direction or the vertical direction.
The method of claim 1 wherein

The area covered by all the beams corresponding to the mother codebook of the first beam level is the same as the area covered by all the beams corresponding to the mother codebook of the second beam level.
The method of claim 1 wherein

The specific codebook configuration in the codebook configuration included in the mother codebook of the second beam level is the same as the mother codebook of the first beam class.
The method of claim 7 wherein

Before the selecting a codebook configuration from the master codebook of the second beam level according to the detection result of the candidate beam, the method further includes:

Selecting the specific codebook configuration as an initial codebook configuration after changing to the second beam level, and

Loading the determined mother codebook of the second beam level,

The selecting a codebook configuration from the mother codebook of the second beam level according to the detection result of the candidate beam includes:

And selecting a codebook configuration from the loaded master codebook of the second beam level to replace the initial codebook configuration according to the detection result of the candidate beam.
The method of claim 1 wherein

The number of antenna ports included in the second beam level is greater than the number of antenna ports included in the first beam level;

At least a part of each codebook configuration included in the mother codebook of the second beam level is obtained by extending the codebook configuration included in the mother codebook of the first beam class in a horizontal and/or vertical direction. of.
An electronic device having a plurality of beam levels, the electronic device comprising:

a mother codebook determining unit configured to determine a candidate among beams that can be used by the electronic device when a beam level used by the electronic device changes from a first beam level to a second beam level of the plurality of beam levels a beam and a mother codebook of the second beam level;

a codebook configuration selecting unit, configured to select a codebook configuration from a mother codebook of the second beam level according to a detection result of the candidate beam, where

The mother codebook of the second beam level is to scale the mother codebook of the first beam level acquired.
The electronic device of claim 10, further comprising:

An index obtaining unit configured to obtain a candidate beam index indicating the determined candidate beam, where

The candidate beam index includes a base index and an index offset,

The base index indicates a location of a base beam in the first beam level,

The index offset indicates an offset from a position of the base beam.
The electronic device of claim 10, wherein

The mother codebook of the second beam level is obtained by scaling the mother codebook of the first beam level in a horizontal and/or vertical direction.
The electronic device of claim 12, wherein

When the number of antenna ports included in the second beam level is greater than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is a mother of the first beam level The codebook is extended in the horizontal and / or vertical direction;

When the number of antenna ports included in the second beam level is smaller than the number of antenna ports included in the first beam level, the mother codebook of the second beam level is a mother of the first beam level The codebook is obtained by reducing it in the horizontal and/or vertical direction.
The electronic device of claim 13 further comprising:

a level determining unit, configured to determine a level indicating parameter, the level indicating parameter indicating whether the number of antenna ports included in the second beam level is more or less than the number of antenna ports included in the first beam level;

The direction determining unit is configured to determine a direction indication parameter, where the direction indication parameter indicates that the mother codebook of the second beam level is to scale the mother codebook of the first beam level in a horizontal direction or a vertical direction.
The electronic device of claim 10, wherein

The specific codebook configuration in the codebook configuration included in the mother codebook of the second beam level is the same as the mother codebook of the first beam class.
The electronic device of claim 15 further comprising:

The initial codebook obtaining unit is configured to select the specific codebook configuration before selecting the codebook configuration from the mother codebook of the second beam level according to the detection result of the candidate beam The initial codebook configuration after changing to the second beam level, and

a loading unit configured to load the determined second code level of the mother codebook, wherein

The codebook configuration determining unit selects a codebook configuration from the loaded mother codebook of the second beam level according to the detection result of the candidate beam to replace the initial codebook configuration.