KR101401323B1 - Base station and control method thereof - Google Patents

Abstract

Disclosed are a base station device and an operation method of a base station device. The base station device is applied with a large antenna device and operates the antenna device by applying a directivity beam forming method and a multiple input and output beam forming method. The present invention efficiently improves an overhead and complexity of measuring a channel quality and reduces cell interference with an adjacent cell.

Description

TECHNICAL FIELD [0001] The present invention relates to a base station apparatus and a base station apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station apparatus and a base station apparatus, and more particularly, to a base station apparatus adopting a large-sized antenna apparatus having a larger number of antenna elements than a conventional antenna apparatus employing a directional beam- To an operation method of a base station apparatus and a base station apparatus capable of effectively improving the overhead and complexity of channel quality measurement by operating the antenna apparatus.

In the mobile communication system, there is an air between a base station and a user equipment, and an antenna device is indispensable for transmitting / receiving radio signals between the base station and the user equipment.

Meanwhile, in recent mobile communication environment, the growth of Long Term Evolution (LTE) network has shifted its focus to WCDMA, which is a 3G service, to LTE network. In addition, introduction of various terminals The introduction of smart phones is accelerating.

As the introduction of smart phones accelerates, the antenna apparatus of the base station is progressing in the form of a large antenna apparatus having a larger number of antenna elements in order to cope with the rapid increase of data traffic.

However, if the number of antenna elements of the antenna apparatus is increased, resources required for pilot signal transmission for channel quality measurement are also increased in the base station apparatus, and the amount of information fed back from the terminal for channel quality measurement is also increased. And the overhead and complexity of the system are increased.

Accordingly, in the present invention, a method of effectively improving the overhead and complexity of channel quality measurement by operating the antenna apparatus by applying a directional beam forming system and a multi-input / output beam forming system in a base station apparatus employing a large antenna apparatus .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a base station apparatus adopting a large antenna apparatus by operating an antenna apparatus by applying a directional beam forming system and a multiple input / And an operation method of a base station apparatus and a base station apparatus that can effectively improve the overhead and complexity of channel quality measurement.

According to a first aspect of the present invention, there is provided a base station apparatus including: an antenna apparatus including a plurality of antenna elements; An antenna grouping unit for grouping the plurality of antenna elements included in the antenna apparatus into at least two antenna groups including two or more antenna elements; An antenna beam controller operable to operate two or more antenna elements for each of the at least two antenna groups in a directional beamforming scheme so that each of the at least two antenna groups can transmit and receive a beamformed signal in a specific direction; And a data transmission control unit for operating the two or more antenna groups by a MIMO beamforming scheme so that each of the two or more antenna groups can transmit different data through the beamformed signal.

Preferably, the channel quality of a channel for each antenna group formed for each of the two or more antenna groups is measured, and a channel quality measurement over the channel quality of a channel for each antenna element formed for each of the plurality of antenna elements is performed. And a channel quality measurement control unit capable of reducing a head.

Preferably, the channel quality measurement control unit determines, with respect to a specific antenna group among the two or more antenna groups, each of two or more antenna elements constituting the specific antenna group through one pilot resource allocated to the specific antenna group The amount of pilot resources can be reduced and the overhead can be reduced by transmitting a pilot signal and allocating a pilot resource to each of the two or more antenna elements.

Preferably, the channel quality measurement control unit receives, from the terminal receiving the pilot signal transmitted by each of the two or more antenna elements constituting the specific antenna group, one And the overhead can be reduced by reducing the feedback signal reception amount in comparison with the case of receiving the feedback signal for each channel of the two or more antenna elements.

Preferably, the plurality of antenna elements are arranged along a row and a column in the antenna apparatus, and the antenna grouping unit groups the plurality of antenna elements based on each row, The specific direction in which beamforming is performed in each of the two or more antenna groups may be shifted in the horizontal direction or the plurality of antenna elements may be grouped on the basis of each column, Or grouping the plurality of antenna elements on the basis of two or more rows and two or more columns so that the specific direction of beam forming in each of the two or more antenna groups can be moved in the vertical direction and the horizontal direction .

Preferably, the mobile station further includes a neighboring cell identifying unit for identifying a neighboring cell for a cell of the base station apparatus in which the beamformed signal of each of the two or more antenna groups arrives; The antenna beam control unit moves the specific direction in which each of the two or more antenna groups is beamformed in at least one of a vertical direction and a horizontal direction so as to reduce the occurrence of interference between the cell of the base station apparatus and the adjacent cell have.

According to a second aspect of the present invention, there is provided an operation method of a base station apparatus including an antenna device including a plurality of antenna elements, the method comprising: arranging the plurality of antenna elements included in the antenna apparatus into two or more antenna elements An antenna grouping step of grouping at least two antenna groups into at least two antenna groups; An antenna beam control step of operating at least two antenna elements for each of the at least two antenna groups in a directional beamforming scheme so that each of the at least two antenna groups can transmit and receive a beamformed signal in a specific direction; And a data transmission control step of operating the two or more antenna groups by a MIMO beamforming scheme so that each of the two or more antenna groups can transmit different data through the beamformed signal.

Preferably, the channel quality of a channel for each antenna group formed for each of the two or more antenna groups is measured, and a channel quality measurement over the channel quality of a channel for each antenna element formed for each of the plurality of antenna elements is performed. And a channel quality measurement control step of reducing the head.

Preferably, the step of controlling the channel quality measurement may further include, in association with a specific antenna group among the at least two antenna groups, determining at least one of two or more antenna elements constituting the specific antenna group through one pilot resource allocated to the specific antenna group It is possible to reduce the overhead by reducing the amount of pilot resource allocation by transmitting the pilot signal and allocating the pilot resource to each of the two or more antenna elements.

Preferably, the channel quality measurement control step includes a step of, based on the pilot signal for a channel of the specific antenna group from a terminal receiving the pilot signal transmitted by each of two or more antenna elements constituting the specific antenna group It is possible to reduce the overhead by reducing the amount of feedback signal reception by receiving a feedback signal and receiving a feedback signal for each channel of the two or more antenna elements.

Preferably, the plurality of antenna elements are arranged along a row and a column in the antenna apparatus, and the antenna grouping step groups the plurality of antenna elements with reference to each row, Grouping the plurality of antenna elements on the basis of the respective columns so that the specific direction for beamforming in each of the two or more antenna groups is orthogonal to the vertical direction Or grouping the plurality of antenna elements on the basis of two or more rows and two or more columns so that the specific direction for beamforming in each of the two or more antenna groups is moved in the vertical direction and the horizontal direction .

Determining a neighboring cell for the cell of the base station device in which the beamformed signal of each of the at least two antenna groups arrives; And a beamforming moving step of moving the specific direction in which each of the at least two antenna groups is beamformed in at least one of a vertical direction and a horizontal direction to reduce interference between the cell of the base station apparatus and the adjacent cell .

The operating method of the base station apparatus and the base station apparatus according to the present invention operates the antenna apparatus by applying the directional beam forming system and the multiple input and output beam forming system while adopting a large antenna apparatus, And further, it is possible to reduce the occurrence of cell interference with the adjacent cell.

1 is a diagram illustrating a configuration of a communication system including a base station apparatus according to a preferred embodiment of the present invention.
FIG. 2 is a diagram illustrating a grouping of a plurality of antenna elements in an antenna apparatus adopted by a base station apparatus according to a preferred embodiment of the present invention.
3 is an exemplary diagram illustrating a specific direction in which an antenna group is beamformed in an antenna apparatus adopted by a base station apparatus according to a preferred embodiment of the present invention.
4 is a control block diagram illustrating a configuration of a base station apparatus according to a preferred embodiment of the present invention.
5 and 6 are flowcharts illustrating an operation method of a base station apparatus according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, a communication system including a base station apparatus according to the present invention will be described. A communication system includes a base station apparatus 100 employing a large antenna apparatus 110, And may include a terminal.

The base station apparatus 100 may have a single cell (or a sector) or a plurality of cells.

For example, as shown in FIG. 1, the base station apparatus 100 may have three cells C1, C2, and C3. In this case, the base station apparatus 100 includes three cells C1, C2, It is possible to adopt each antenna device. Hereinafter, for convenience of description, one antenna device 110 related to the cell C1 among the antenna devices adopted by the base station device 100 will be described.

The antenna device 110 includes a plurality of antenna elements.

More specifically, it is preferable that the antenna device 110 employed in the base station device 100 according to the present invention is a large antenna device having a larger number of antenna elements than conventionally used general antenna devices.

That is, the large-sized antenna apparatus 110 is an advanced type antenna apparatus developed to cope with the surge of data traffic due to the recent introduction of smart phones and diversification of large-capacity data services.

Meanwhile, since a wireless signal is transmitted and received between the antenna apparatus adopted by the base station apparatus and the terminal of the user, it is very important to adaptively operate the channel according to the channel quality of the wireless channel.

Accordingly, in the base station apparatus, a channel quality measurement procedure for a channel for each antenna element formed for each antenna element is performed in order to measure the channel quality between the antenna apparatus and the user terminal.

For example, assuming that the base station apparatus adopts an antenna apparatus including four antenna elements, the base station apparatus allocates pilot resources to each of the four antenna elements.

Accordingly, the base station apparatus transmits a pilot signal for each antenna element through the pilot resource allocated to each of the four antenna elements, and the terminal located in the cell C1 of the base station apparatus receives the pilot signal. The terminal transmits a feedback signal including channel information generated based on the pilot signal of the corresponding antenna element to the base station apparatus for each channel formed by each antenna element.

Here, the channel information included in the feedback signal may include code index information that is determined to have the highest correlation with the pilot signal of the corresponding channel based on the received strength of the pilot signal of the corresponding channel and predefined codebook information have.

Accordingly, the base station apparatus can measure channel quality for each antenna element based on a feedback signal (e.g., a received signal strength of the pilot signal) for each antenna element received from the terminals. In addition, the base station apparatus can perform coding of a signal to be transmitted to each terminal based on a feedback signal (e.g., code index information) for a channel of each antenna element received from the terminals.

However, since the number of antenna elements in the large-sized antenna apparatus 110 employed in the present invention is considerably larger than that in the prior art, the number of pilot resources to be allocated to each antenna element in the base station apparatus adopting the antenna apparatus 110 And feedback signals for the channels of the antenna elements received from the terminals are also increased. As a result, there arises a problem that the overhead of the channel quality measurement increases as the number of antenna elements increases.

Further, most of the terminals used in the market follow the channel quality measurement support function which supports the channel quality measurement in the base station apparatus as described above.

That is, when the terminal receives the pilot signal of each antenna element from the base station apparatus, the terminal generates and transmits a feedback signal for each antenna element according to the channel quality measurement support function as described above.

At this time, the codebook information previously defined in the channel quality measurement support function is limited in the number of channels for checking the code index information, and is suitable for an environment of a conventional antenna apparatus smaller in size than the antenna apparatus 110 of the present invention The number of the limited channels may be smaller than the number of the antenna elements of the antenna device 110. [

In this case, in order to adopt the large-sized antenna apparatus 110 as in the present invention, since the codebook information in the channel quality measurement support function used in most existing terminals must be corrected, the number of antenna elements increases There arises a problem that the complexity of channel quality measurement increases.

Accordingly, the base station apparatus 100 of the present invention is a base station that can solve the above-described problematic situation that may occur due to the adoption of the large-sized antenna apparatus 110 while adopting the large-sized antenna apparatus 110 as described above .

Hereinafter, a base station apparatus according to a preferred embodiment of the present invention will be described in more detail with reference to FIG.

The base station apparatus 100 according to the present invention includes an antenna apparatus 110 including a plurality of antenna elements and a plurality of antenna elements 110 and a plurality of antenna elements 110, And an antenna grouping unit 120 for grouping two or more antenna elements into two or more antenna groups by operating a directional beamforming method so that each of the two or more antenna groups can transmit and receive a beamformed signal in a specific direction An antenna beam controller 130 for operating the two or more antenna groups according to a MIMO beamforming scheme so that each of the two or more antenna groups can transmit different data through the beamformed signal, (140).

The antenna device 110 is a large-sized antenna device including a plurality of antenna elements as described above.

The antenna grouping unit 120 groups a plurality of antenna elements included in the antenna apparatus 110 into two or more antenna groups each composed of two or more antenna elements.

More specifically, as shown in FIG. 2, in the antenna device 110, a plurality of antenna elements 101 may be arranged in a row and a column. In FIG. 2, the antenna device 110 includes sixteen antenna elements arranged in four columns and four columns.

A method of grouping the antenna groups in the antenna grouping unit 120 will now be described.

According to one embodiment, the antenna grouping unit 120 groups a plurality of antenna elements on the basis of each row, and specifies a specific direction in which beamforming is performed in each of two or more antenna groups in the horizontal direction, that is, It can be moved in the right direction.

2, the antenna grouping unit 120 divides a plurality of antenna elements, for example, 16 antenna elements included in the antenna apparatus 110 into four antenna elements, Group of antenna groups 111a, 112a, 113a, and 114a.

In this way, when 16 antenna elements are grouped on the basis of each row, a specific direction in which beam forming is performed in each antenna group, for example, four antenna groups 111a, 112a, 113a, and 114a, And has a rotating structure.

Referring to FIG. 3, when antenna elements are grouped on the basis of each row as in case A in FIG. 2, it corresponds to A in FIG.

That is, the specific direction of beamforming in each antenna group, for example, the four antenna groups 111a, 112a, 113a, and 114a, grouping on the basis of each row, Beam2 -> beam3 -> beam2 -> beam1 -> beam2 ... can be moved to the left / right direction of beam1 -> beam2 -> beam3 -> beam2 -> beam1 -> beam2.

Meanwhile, according to another embodiment, the antenna grouping unit 120 groups a plurality of antenna elements on the basis of the respective columns, so that a specific direction of beam forming in each of two or more antenna groups is orthogonal to the vertical direction, Cell center / cell boundary direction.

2, the antenna grouping unit 120 divides a plurality of antenna elements, for example, 16 antenna elements included in the antenna apparatus 110 into four antenna elements, Group of antenna groups 111b, 112b, 113b, and 114b.

In this way, when 16 antenna elements are grouped with respect to each column, a specific direction of beam forming in each antenna group, for example, four antenna groups 111b, 112b, 113b and 114b, And has a beam rotating structure that can be moved toward the cell center / cell boundary direction.

Referring to FIG. 3, the case of grouping the antenna elements with respect to each column as in the case of FIG. 2B corresponds to FIG. 3B.

That is, the specific direction of beam forming at each antenna group, for example, the four antenna groups 111b, 112b, 113b, and 114b, grouping with respect to each row is as shown in FIG. Can be moved to the boundary direction and moved to beam1 -> beam2 -> besam3 -> beam2 -> beam1 -> beam2 ....

Meanwhile, according to another embodiment, the antenna grouping unit 120 groups a plurality of antenna elements based on two or more rows and two or more columns, and a specific direction in which beam forming is performed in each of two or more antenna groups is horizontal I.e., the left / right direction of the cell C1 and the cell center / cell boundary direction.

2, the antenna grouping unit 120 divides a plurality of antenna elements, for example, 16 antenna elements included in the antenna apparatus 110 into two rows and four columns It can be grouped into two or more antenna groups, for example, four antenna groups 111c, 112c, 113c, and 114c, each consisting of antenna elements.

In this way, when 16 antenna elements are grouped based on two or more rows and two or more columns, a specific direction of beam forming in each antenna group, for example, four antenna groups 111c, 112c, 113c, and 114c, And in the horizontal direction, i.e., the left / right direction of the cell C1 and the cell center / cell boundary direction.

Referring to FIG. 3, the case of grouping antenna elements on the basis of two rows and two columns, as in the case of C in FIG. 2, corresponds to C in FIG.

That is, the specific direction of beam forming in each antenna group, for example, four antenna groups 111c, 112c, 113c, and 114c grouping with reference to two rows and two columns, Similarly, it can be moved to the left / right direction and the cell center / cell boundary direction and can be moved to beam1 -> beam2 -> besam3 -> beam2 -> beam1 -> beam2 ....

Hereinafter, for convenience of description, a case of grouping into four antenna groups 111a, 112a, 113a and 114a as in case A of FIG. 2 will be described.

The antenna beam controller 130 operates two or more antenna elements configured by two or more antenna groups in a directional beamforming manner so that each of the two or more antenna groups can transmit and receive a beamformed signal in a specific direction.

That is, the antenna beam controller 130 operates the four antenna elements in the antenna group 111a in the directional beamforming manner for each of the four antenna groups 111a, 112a, 113a, and 114a, Four antenna elements are operated by a directional beam forming method, four antenna elements in the antenna group 113a are operated by a directional beam forming method, and four antenna elements in the antenna group 114a are operated by a directional beam forming method , And the antenna groups 111a, 112a, 113a, and 114a can transmit and receive a beamformed signal in a specific direction.

The directional beamforming scheme is a beamforming scheme for improving the signal quality of a terminal located in a specific direction in a cell. The beamforming scheme is based on angle-of-arrival estimation information and angle-of-departure estimation information of a transmission / , Through beam formation with directionality.

Here, the specific operation control procedure for the antenna beam controller 130 to operate the antenna elements in each antenna group in the directional beamforming scheme may be a process for realizing the conventional directional beamforming scheme, and thus a detailed description thereof will be omitted .

The data transmission control unit 140 operates two or more antenna groups by a MIMO beamforming scheme so that each of two or more antenna groups can transmit different data through a beamformed signal.

That is, the antenna beam controller 130 operates each of the four antenna groups 111a, 112a, 113a, and 114a in a MIMO beamforming manner, So that different data can be transmitted through the formed signal.

The MIMO beamforming scheme is applied to a standard of an existing mobile communication system such as an LTE system and is a beamforming scheme that increases data rates by transmitting various data to terminals at the same time. And accurate channel quality measurement is required for the channel between the terminals.

Here, the specific operation control procedure for operating the antenna group by the antenna beam controller 130 in the MIMO beamforming scheme may be a process for realizing the conventional MIMO beamforming scheme, and thus a detailed description thereof will be omitted.

As described above, in order to solve the above-described problematic situation that may occur as a result of employing the large-sized antenna apparatus 110, the base station apparatus 100 of the present invention employing the large- The antenna elements are structurally grouped to implement a directional beamforming scheme for the antenna elements in each antenna group and a multi-input / output beamforming scheme for each antenna group.

1, the base station apparatus 100 according to the present invention is configured such that each of the antenna groups 111a, 112a, 113a, and 114a performs beamforming in a specific direction in the cell C1 of the base station apparatus 100, 3, and 4 to improve the signal quality of the terminal 10 located in a specific direction and also to improve the signal quality of the beamformed antenna groups 111a, 112a, 113a, and 114a, The data rate of the terminal 10 is increased by transmitting different data to the terminals 1, 2, 3, and 4 and transmitting / receiving the data to the terminal.

The base station apparatus 100 according to the present invention maps the antenna groups 111a and 112a and the antenna groups 113a and 114a so that each of the antenna groups 111a and 112a is connected to the cell C1 of the base station 100 (1, 2) in a first specific direction in the first specific direction and transmits different data to the beamformed signals (1,2) transmitted and received by the antenna groups (111a, 112a) The data transmission rate of the terminal 10 is increased and the antenna groups 113a and 114a each receive a beamformed signal in a second specific direction different from the above first specific direction in the cell C1 of the base station apparatus 100 (3, 4) to transmit and receive different data to the beamformed signals (3,4) transmitted and received by the antenna groups (113a, 114a) It is possible.

As described above, the base station apparatus 100 that realizes a structural environment in which a directional beamforming scheme and a multi-input / output beamforming scheme are applied can realize the problem situation mentioned above, that is, It is possible to solve the problem situation in which overhead and complexity are increased.

To this end, the base station apparatus 100 according to the present invention further includes a channel quality measurement control unit 150.

The channel quality measurement control unit 150 measures the channel quality of a channel for each antenna group formed for each of two or more antenna groups and measures channel quality for each antenna element The overhead of measurement can be reduced.

That is, the channel quality measurement controller 150 calculates the channel quality for each antenna group formed for each antenna group 111a, 112a, 113a, and 114a by referring to the antenna groups 111a, 112a, 113a, It is possible to obtain a result of reducing the overhead of channel quality measurement rather than measuring the channel quality for each antenna element formed for each of the 16 antenna elements of the antenna apparatus 110 by measuring the channel quality.

More specifically, the channel quality measurement control unit 150 determines, with respect to a specific antenna group among two or more antenna groups, two or more antennas constituting the specific antenna group through one pilot resource allocated to the specific antenna group Elements can transmit the pilot signals, thereby reducing the pilot resource allocation amount and reducing the overhead of channel quality measurement, as compared with the case where pilot resources are allocated to each of the two or more antenna elements.

Here, the specific antenna group is at least one of two or more antenna groups. That is, the specific antenna group may be one antenna group of two or more antenna groups and each of two or more antenna groups.

At this time, it is preferable that the specific antenna group is each of two or more antenna groups.

That is, the base station apparatus 100 allocates pilot resources to each of the grouped antenna groups. For example, in the base station apparatus 100, one pilot resource is assigned to each of the antenna groups 111a, 112a, 113a, and 114a.

In other words, the base station apparatus 100 of the present invention is configured such that, for the antenna apparatus 110 including 16 antenna elements, as in the conventional channel quality measurement procedure for a channel for each antenna element, Instead of allocating resources, the pilot resources are allocated only to each antenna group.

Hereinafter, for convenience of description, the antenna group 111a among the antenna groups 111a, 112a, 113a, and 114a as the specific antenna group will be referred to.

Accordingly, the channel quality measurement control unit 150 acquires the antenna group (111a) from one antenna group (111a, 112a, 113a, 114a) through one pilot resource allocated to the antenna group 111a of the antenna elements transmit the pilot signals. That is, the channel quality measurement controller 150 allocates one and the same pilot resource to each antenna element in the antenna group 111a, and allocates all the antenna elements in the antenna group 111a to which one identical pilot resource is allocated And transmits a pilot signal associated with the antenna group 111a.

The channel quality measurement control unit 150 also determines the channel quality of each of the remaining antenna groups 112a, 113a, and 114a based on one pilot resource allocated to the corresponding antenna group, Each of which will transmit a pilot signal.

As a result, the channel quality measurement controller 150 transmits a pilot signal for each antenna element through the antenna device 110 including 16 antenna elements, as in the conventional channel quality measurement procedure for each antenna element Instead, the amount of pilot signal transmission can be reduced by transmitting a pilot signal for each antenna group, and the terminal 10 located in the cell C1 of the base station apparatus 100 receives the pilot signal.

Therefore, according to the present invention, the pilot resource allocation amount and the pilot signal transmission amount are reduced as compared with the case of allocating the pilot resources for each antenna element and transmitting the pilot signals, as in the conventional channel quality measurement procedure for each antenna element The overhead of channel quality measurement can be reduced.

Then, the channel quality measurement control unit 150 receives, from the terminal receiving the pilot signal transmitted by each of the two or more antenna elements constituting the specific antenna group, one (1) channel based on the pilot signal for the channel of the specific antenna group It is possible to reduce the overhead of the channel quality measurement by reducing the amount of feedback signal reception by receiving the feedback signal and receiving the feedback signal for each channel of the two or more antenna elements.

More specifically, the terminal 10 receiving the pilot signal transmitted for each of the antenna groups 111a, 112a, 113a and 114a described above recognizes that the antenna elements included in the antenna group are single antenna elements do. Therefore, the terminal 10 can recognize the four antenna groups 111a, 112a, 113a, and 114a as four antenna elements.

Referring to the antenna group 111a of each of the antenna groups 111a, 112a, 113a and 114a as a specific antenna group, the terminal 10 determines that the channel of the antenna group 111a (the terminal 10 is a single antenna element The base station apparatus 100 will transmit one feedback signal including the channel information generated based on the received pilot signal according to the channel quality measurement support function to the base station apparatus 100. [

At this time, since the terminal 10 receives the pilot signal for each of the four grouped antenna groups, not for each of the 16 antenna elements of the antenna apparatus 110, recognizes each antenna group as each antenna element, The possibility that the number of the limited channels of the codebook information is smaller than the number of antenna groups of the antenna apparatus 110 in the channel quality measurement support function is reduced.

Therefore, according to the present invention, there is no need to modify the codebook information in the channel quality measurement support function used in most existing terminals, and the problematic situation in which the complexity of the channel quality measurement is increased does not occur.

The channel quality measurement control unit 150 may receive one feedback signal from the terminal 10 for the channel of the antenna group 111a. Likewise, the channel quality measurement control unit 150 can receive one feedback signal from the terminal 10 for each of the channels of the remaining antenna groups 112a, 113a, and 114a.

The channel quality measurement controller 150 determines the channel quality of each antenna group based on the feedback signal (e.g., the received signal strength of the pilot signal) of each antenna group received from the terminals 10 The quality can be measured.

As a result, the channel quality measurement controller 150 receives feedback signals for each of the 16 antenna elements through the antenna device 110 including 16 antenna elements, as in the conventional channel quality measurement procedure for each antenna element Instead of receiving the feedback signal, the reception amount of the feedback signal to be received can be reduced from 16 to 4 by receiving the feedback signal for each antenna group.

Therefore, according to the present invention, it is possible to reduce the overhead of the channel quality measurement by reducing the feedback signal reception amount, as compared with the case of receiving the feedback signal for each antenna element as in the conventional channel quality measurement procedure for each antenna element have.

As described above, the base station apparatus 100 according to the present invention operates the antenna apparatus by employing the directional beam forming system and the multiple input / output beam forming system while adopting the large antenna apparatus 110, The overhead and the complexity can be effectively improved.

Furthermore, the base station apparatus 100 of the present invention has a beam rotation structure in grouping the antenna elements of the antenna apparatus 110 to transmit and receive directional beam-formed signals for each antenna group as described above.

Therefore, the base station apparatus 100 of the present invention utilizes the beam rotation structure of each antenna group to reduce inter-cell interference with adjacent adjacent cells.

To this end, the base station apparatus 100 of the present invention may further include an adjacent cell checking unit 160.

The neighboring cell identifying unit 160 identifies the neighboring cell in relation to the cell C1 of the base station device 100. [

The antenna beam controller 130 moves the specific direction in which each of the two or more antenna groups is beamformed in at least one of a vertical direction and a horizontal direction so that the cell C1 of the base station device 100 and the identified adjacent cell Thereby reducing the occurrence of interference between them.

That is, the antenna beam controller 130 moves the specific direction in which each of the four antenna groups 111a, 112a, 113a, and 114a is beamformed in at least one of the vertical direction and the horizontal direction, The occurrence of interference between the cell C1 of the mobile station UE and the identified adjacent cell is reduced.

For example, the antenna beam controller 130 can confirm the beam rotation period of the signal that is directional beamformed for each antenna group in the adjacent cell identified by the adjacent cell identifier 160. For example, the antenna beam controller 130 may operate in conjunction with a central apparatus that directly interacts with a base station apparatus (not shown) of a neighboring cell or controls / manages the base station apparatuses, You can check the beam rotation period at which the direction (eg, left / right / center of cell / cell boundary) is moved.

Accordingly, the antenna beam controller 130 can estimate the beam rotation cycle with the lowest possibility of interference between the cell C1 of the base station device 100 and adjacent cells based on the determined beam rotation period of the adjacent cell have.

For example, if the signal of the adjacent cell has a beam rotation period in which the signal is horizontally shifted left / right, the antenna beam controller 130 may estimate the beam rotation period shifted to the right / left in the horizontal direction so as to be staggered with the signal of the adjacent cell , The antenna beam controller 130 controls the beam rotation period of the vertical cell boundary / cell center to be shifted to the vertical cell boundary / cell center so as to be staggered with the signal of the adjacent cell, if the signal of the adjacent cell has a beam rotation period Can be estimated.

Accordingly, the antenna beam controller 130 moves the cells C1 (C1) of the base station apparatus 100 by moving the antenna groups 111a, 112a, 113a, and 114a in accordance with the estimated beam rotation periods ) And the neighboring cells that have been checked.

As described above, the base station apparatus according to the present invention employs a directional beam forming system and a multi-input / output beamforming system while operating the antenna apparatus while adopting a large antenna apparatus 110, It is possible to effectively improve the complexity and further reduce the occurrence of cell interference with the adjacent cell.

Hereinafter, an operation method of the base station apparatus according to the preferred embodiment of the present invention will be described in detail with reference to FIG. 5 and FIG.

First, referring to FIG. 5, an operation method of the base station apparatus 100 according to the present invention will be described. For convenience of explanation, reference will be made to the reference numerals of FIGS. 1 to 4 described above.

First, the base station apparatus 100 according to the present invention adopts a large-sized antenna apparatus 110.

The method of operating the base station apparatus 100 according to the present invention employing the large-sized antenna apparatus 110 is a method in which a plurality of antenna elements included in the antenna apparatus 110 are grouped into two or more antenna groups composed of two or more antenna elements (S100).

More specifically, as described above with reference to FIG. 2, the method of operating the base station apparatus 100 according to the present invention is a method in which a plurality of antenna elements included in the antenna apparatus 110 are grouped So that a specific direction for beamforming in each of the two or more antenna groups can be moved in the horizontal direction, or a plurality of antenna elements included in the antenna apparatus 110 can be grouped based on each column, And a plurality of antenna elements included in the antenna device 110 may be grouped based on two or more rows and two or more columns to form two or more antenna groups So that a specific direction of beam-forming in each can be moved in the horizontal direction and the vertical direction.

Hereinafter, for convenience of description, a case of grouping into four antenna groups 111a, 112a, 113a and 114a as in case A of FIG. 2 will be described.

In the method of operating the base station 100 according to the present invention, two or more antenna elements configured for two or more antenna groups are operated by a directional beam-forming method, and each of two or more antenna groups transmits and receives a beam- (S110).

That is, the method of operating the base station 100 according to the present invention operates the four antenna elements in the antenna group 111a by the directional beamforming method for each of the four antenna groups 111a, 112a, 113a, and 114a, The four antenna elements in the antenna group 112a are operated by the directional beam forming method, the four antenna elements in the antenna group 113a are operated by the directional beam forming method, and the four antenna elements in the antenna group 114a are directional The antenna group 111a, 112a, 113a, and 114a can transmit and receive a beamformed signal in a specific direction by operating in a beamforming manner.

Meanwhile, the method of operating the base station device 100 according to the present invention operates two or more antenna groups in a MIMO beamforming manner, so that each of two or more antenna groups can transmit different data through a beamformed signal (S120).

That is, the operation method of the base station apparatus 100 according to the present invention operates the antenna groups 111a, 112a, 113a, and 114a by operating the four antenna groups 111a, 112a, 113a, and 114a in a MIMO beamforming manner, Are capable of transmitting different data through a beamformed signal transmitted by each of them.

As described above, the operation method of the base station apparatus 100 according to the present invention employing the large-sized antenna apparatus 110 solves the above-described problem situation that may occur due to the adoption of the large-sized antenna apparatus 110 The antenna elements are structurally grouped to implement a directional beamforming scheme for the antenna elements in each antenna group and a multi-input / output beamforming scheme for each antenna group.

As described above, the operation method of the base station apparatus 100 according to the present invention, which realizes a structural environment in which a directional beam forming system and a multi-input / output beam forming system are applied, The situation in which the overhead and complexity of the channel quality measurement are increased can be solved.

Hereinafter, with reference to FIG. 6, an operation flow for solving a problem situation in which overhead and complexity of channel quality measurement are increased will be described.

As shown in FIG. 6, a method of operating the base station 100 according to the present invention allocates pilot resources to each group of antenna groups (S140). For example, an operation method of the base station apparatus 100 according to the present invention allocates four pilot resources to antenna groups 111a, 112a, 113a, and 114a, respectively.

In other words, the operation method of the base station apparatus 100 according to the present invention can be applied to an antenna apparatus 110 including 16 antenna elements, as in a conventional channel quality measurement procedure for each antenna element, Instead of assigning pilot resources to the antenna elements, the pilot resources are allocated only to each antenna group.

Hereinafter, for convenience of description, the antenna group 111a among the antenna groups 111a, 112a, 113a, and 114a will be referred to.

The method of operation of the base station apparatus 100 according to the present invention is a method of operating the antenna group 111a in such a manner that four antenna elements constituting the antenna group 111a are connected to each other via one pilot resource allocated to the antenna group 111a And transmits the pilot signal (S150). That is, in the method of operating the base station 100 according to the present invention, one identical pilot resource is allocated to each antenna element in the antenna group 111a, and the same pilot resource is allocated in the antenna group 111a And transmits a pilot signal associated with the antenna group 111a through all of the antenna elements.

As described above, the operation method of the base station apparatus 100 according to the present invention is also applicable to each of the remaining antenna groups 112a, 113a, and 114a by configuring a corresponding antenna group through one pilot resource allocated to the corresponding antenna group Each of the four antenna elements to transmit a pilot signal.

Therefore, in the method of operating the base station 100 according to the present invention, instead of transmitting a pilot signal for each antenna element as in a conventional channel quality measurement procedure for a channel for each antenna element, Thereby reducing the amount of pilot signal transmission and reducing the overhead of channel quality measurement.

On the other hand, the terminal 10 receiving the pilot signal transmitted for each of the antenna groups 111a, 112a, 113a and 114a described above recognizes that the antenna elements included in the antenna group are single antenna elements. Therefore, the terminal 10 can recognize the four antenna groups 111a, 112a, 113a, and 114a as four antenna elements.

Referring to the antenna group 111a among the antenna groups 111a, 112a, 113a and 114a, the terminal 10 determines whether the channel of the antenna group 111a (the terminal 10 is a channel of a single antenna element) ) Based on the received pilot signal according to the channel quality measurement support function to the base station apparatus 100. [

At this time, since the terminal 10 receives the pilot signal for each of the four grouped antenna groups, not for each of the 16 antenna elements of the antenna apparatus 110, recognizes each antenna group as each antenna element, The possibility that the number of the limited channels of the codebook information is smaller than the number of antenna groups of the antenna apparatus 110 in the channel quality measurement support function is reduced.

Therefore, according to the present invention, there is no need to modify the codebook information in the channel quality measurement support function used in most existing terminals, and the problematic situation in which the complexity of the channel quality measurement is increased does not occur.

The method of operating the base station apparatus 100 according to the present invention can receive a single feedback signal from the terminal 10 for the channel of the antenna group 111a. Similarly, the operation method of the base station apparatus 100 according to the present invention can receive one feedback signal from the terminal 10 for each of the channels of the remaining antenna groups 112a, 113a, and 114a (S160).

The method for operating the base station 100 according to the present invention is based on a feedback signal (e.g., a received signal strength of a pilot signal) for a channel of each antenna group received from the terminals 10, It is possible to measure the channel quality for the star channel (S170).

Therefore, instead of receiving feedback signals for each of the 16 antenna elements as in the conventional channel quality measurement procedure for each antenna element, the operation method of the base station apparatus 100 according to the present invention may include: The amount of feedback signal reception can be reduced to reduce the overhead of channel quality measurement.

As described above, the operating method of the base station apparatus 100 according to the present invention is a method of operating the antenna apparatus by employing the directional beam forming system and the multiple input / output beam forming system while adopting the large antenna apparatus 110, The overhead and complexity of the quality measurement can be effectively improved.

Furthermore, the method of operation of the base station apparatus 100 according to the present invention confirms neighboring cells with respect to the cell C1 of the base station apparatus 100 (S180).

The operation method of the base station apparatus 100 according to the present invention is a method of moving a specific direction in which each of two or more antenna groups is beamformed in at least one of a vertical direction and a horizontal direction, C1) and the neighboring cells identified (S190).

That is, the operation method of the base station apparatus 100 according to the present invention moves the specific direction in which each of the four antenna groups 111a, 112a, 113a, and 114a is beam-formed in at least one of a vertical direction and a horizontal direction , The occurrence of interference between the cell C1 of the base station apparatus 100 and the neighboring cell that has been checked is reduced.

For example, the method of operation of the base station apparatus 100 according to the present invention can confirm the beam rotation period of a signal that is directional beamformed for each antenna group in the identified adjacent cell.

The method for operating the base station apparatus 100 according to the present invention is a method for operating a base station apparatus 100 based on the determined beam rotation period of the adjacent cell, The rotation period can be estimated.

For example, when the signal of the adjacent cell has a beam rotation period in which the signal is horizontally moved left / right, the operation method of the base station apparatus 100 according to the present invention is a method of operating a beam The method of operation of the base station apparatus 100 according to the present invention may be applied to the case where the signal of the neighboring cell is mixed with the signal of the neighboring cell A vertical rotation direction of the cell / a center rotation direction of the cell can be estimated.

The method of operation of the base station apparatus 100 according to the present invention is a method in which each of the four antenna groups 111a, 112a, 113a, and 114a moves according to a beam rotation period in which a specific direction of beam forming is estimated, It is possible to reduce the occurrence of interference between the cell C1 of the mobile station 100 and the identified adjacent cell.

As described above, the operating method of the base station apparatus according to the present invention operates the antenna apparatus by using the directional beam forming system and the multi-input / output beam forming system while adopting the large antenna apparatus 110, The overhead and the complexity can be effectively improved, and further, the occurrence of cell interference with the adjacent cell can also be reduced.

The method of operation of the base station apparatus according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer readable medium. The computer-readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable media include magnetic media such as hard disks, floppy disks and magnetic tape; optical media such as CD-ROMs and DVDs; magnetic media such as floppy disks; Magneto-optical media, and hardware devices specifically configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include machine language code such as those produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

According to the operation method of the base station apparatus and the base station apparatus according to the present invention, when a large-sized antenna apparatus is adopted, the antenna apparatus is operated by applying the directional beam forming system and the multiple input / output beam forming system, The present invention is not limited to the use of related technologies, but merely has a possibility of being marketed or operated, and it can be practically and practically carried out. Therefore, .

100: base station device
110: antenna device 120: antenna grouping unit
130: antenna beam controller 140: data transmission controller
150: channel quality measurement control unit 160: neighbor cell check unit

Claims (12)

In the base station apparatus,
An antenna device comprising a plurality of antenna elements;
An antenna grouping unit for grouping the plurality of antenna elements included in the antenna apparatus into at least two antenna groups including two or more antenna elements;
An antenna beam controller operable to operate two or more antenna elements for each of the at least two antenna groups in a directional beamforming scheme so that each of the at least two antenna groups can transmit and receive a beamformed signal in a specific direction;
A data transmission controller operable to operate the at least two antenna groups by a MIMO beamforming scheme so that each of the at least two antenna groups can transmit different data through the beamformed signal; And
It is possible to reduce the overhead of channel quality measurement by measuring the channel quality for each antenna group formed for each of the two or more antenna groups and measuring the channel quality for each antenna element formed for each of the plurality of antenna elements And a channel quality measurement control unit for controlling the channel quality of the base station apparatus.
delete The method according to claim 1,
Wherein the channel quality measurement control unit comprises:
Each of two or more antenna elements constituting the specific antenna group transmits a pilot signal through one pilot resource allocated to the specific antenna group in association with a specific antenna group among the two or more antenna groups, Wherein the pilot resource allocation amount is reduced and the overhead can be reduced when pilot resources are allocated to each element. The method of claim 3,
Wherein the channel quality measurement control unit comprises:
Wherein the base station receives a single feedback signal based on the pilot signal for a channel of the specific antenna group from a terminal that receives the pilot signal transmitted by each of two or more antenna elements constituting the specific antenna group, And the overhead can be reduced by reducing the amount of feedback signal reception when the feedback signal is received for each channel of the element. The method according to claim 1,
Wherein the plurality of antenna elements are arranged along a row and a column in the antenna device,
The antenna grouping unit,
Grouping the plurality of antenna elements on the basis of the respective rows so that the specific direction of beamforming in each of the two or more antenna groups can be moved in the horizontal direction,
Grouping the plurality of antenna elements on the basis of the vertical columns so that the specific direction of beamforming in each of the two or more antenna groups can be moved in the vertical direction,
Wherein the plurality of antenna elements are grouped based on two or more rows and two or more columns so that the specific direction of beamforming in each of the two or more antenna groups can be moved in a vertical direction and a horizontal direction Base station apparatus. 6. The method of claim 5,
Further comprising a neighboring cell identifying unit for identifying a neighboring cell for a cell of the base station apparatus in which the beamformed signal of each of the two or more antenna groups arrives;
Wherein the antenna beam controller comprises:
The base station apparatus moves the specific direction in which each of the two or more antenna groups is beamformed in at least one of a vertical direction and a horizontal direction to reduce interference between the cell of the base station apparatus and the adjacent cell. A method of operating a base station apparatus having an antenna apparatus including a plurality of antenna elements,
An antenna grouping step of grouping the plurality of antenna elements included in the antenna device into two or more antenna groups each consisting of two or more antenna elements;
An antenna beam control step of operating at least two antenna elements for each of the at least two antenna groups in a directional beamforming scheme so that each of the at least two antenna groups can transmit and receive a beamformed signal in a specific direction;
A data transmission control step of operating the two or more antenna groups by a MIMO beamforming scheme so that each of the two or more antenna groups can transmit different data through the beamformed signal; And
It is possible to reduce the overhead of channel quality measurement by measuring the channel quality for each antenna group formed for each of the two or more antenna groups and measuring the channel quality for each antenna element formed for each of the plurality of antenna elements And a channel quality measurement control step of controlling the channel quality of the base station apparatus.
delete 8. The method of claim 7,
Wherein the channel quality measurement control step comprises:
Each of two or more antenna elements constituting the specific antenna group transmits a pilot signal through one pilot resource allocated to the specific antenna group in association with a specific antenna group among the two or more antenna groups, Wherein the overhead is reduced by reducing the amount of pilot resource allocation than when allocating a pilot resource to each element. 10. The method of claim 9,
Wherein the channel quality measurement control step comprises:
Wherein the base station receives a single feedback signal based on the pilot signal for a channel of the specific antenna group from a terminal that receives the pilot signal transmitted by each of two or more antenna elements constituting the specific antenna group, Wherein the amount of feedback signal reception is reduced to reduce the overhead when a feedback signal is received for each channel. 8. The method of claim 7,
Wherein the plurality of antenna elements are arranged along a row and a column in the antenna device,
The antenna grouping step includes:
Grouping the plurality of antenna elements on the basis of the respective rows so that the specific direction of beamforming in each of the two or more antenna groups can be moved in the horizontal direction,
Grouping the plurality of antenna elements on the basis of the vertical columns so that the specific direction of beamforming in each of the two or more antenna groups can be moved in the vertical direction,
Wherein the plurality of antenna elements are grouped based on two or more rows and two or more columns so that the specific direction of beamforming in each of the two or more antenna groups can be moved in a vertical direction and a horizontal direction / RTI > 12. The method of claim 11,
An adjacent cell checking step of checking a neighboring cell for a cell of the base station apparatus in which a beamformed signal of each of the two or more antenna groups arrives; And
Further comprising a beamforming moving step of moving the specific direction in which each of the two or more antenna groups is beamformed in at least one of a vertical direction and a horizontal direction to reduce the occurrence of interference between the cell of the base station apparatus and the adjacent cell The base station apparatus comprising:

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