KR101387251B1 - Method and apparatus for selecting transceiver mode - Google Patents

Method and apparatus for selecting transceiver mode Download PDF

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KR101387251B1
KR101387251B1 KR1020130087943A KR20130087943A KR101387251B1 KR 101387251 B1 KR101387251 B1 KR 101387251B1 KR 1020130087943 A KR1020130087943 A KR 1020130087943A KR 20130087943 A KR20130087943 A KR 20130087943A KR 101387251 B1 KR101387251 B1 KR 101387251B1
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transmission power
users
transceiver mode
base station
current
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KR1020130087943A
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Korean (ko)
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채찬병
임연근
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연세대학교 산학협력단
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0689—Hybrid systems, i.e. switching and simultaneous transmission using different transmission schemes, at least one of them being a diversity transmission scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A method and a device for selecting a transceiver mode are provided. A method for selecting a transceiver mode of a base station according to a channel state of the present invention includes: a step of selecting a transceiver mode as a maximum ratio transmission (MRT)/maximum ratio combining (MRC) method when a channel state is unstable as the current transmission power is less than a first reference transmission power; and a step of selecting the transceiver mode based on the transmission power or the number (K) of users which are the service target when the channel state is stable as the current transmission power is at least the first reference transmission power. The current transmission power is classified into downlink transmission power (Pt) and uplink transmission power (Pu) and the first reference transmission power is made up by considering the number of antennae of the base station without considering the number of users, and is classified into downlink reference transmission power (Pcross.DL) and uplink reference transmission power (Pcross.UL).

Description

 Transceiver mode selection method and apparatus {METHOD AND APPARATUS FOR SELECTING TRANSCEIVER MODE}

The present invention relates to a method and apparatus for selecting a transceiver mode, and more particularly, to a method and apparatus for selecting a transceiver mode of a base station according to a channel state.

Recently, MASSIVE MIMO, which uses a large number of antennas at the base station for increasing network capacity and energy saving, has been studied as a next-generation communication technology. In the MASSIVE MIMO environment, a matched filter is shown because the performance is close to the nonlinear algorithm even when the linear algorithm is used. (Matched Filter) or Zero forcing (ZF) has been studied a lot.

It is well known that matched filter transceivers perform better at lower signal-to-noise-ratio (SNR) than ZF schemes.However, given the number of antennas and the number of users serviced in a MASSIVE MIMO environment, Little research has been done on which transceiver mode is more efficient at which SNR.

In addition, when the transmission SNR is fixed, little research has been conducted on the number of users that can be most efficiently serviced.

Therefore, in the environment such as MASSIVE MIMO, given the number of antennas of the base station, the number of users to be serviced, and the transmission SNR, a transceiver mode selection method for more efficiently providing services in downlink and uplink is provided. This is required.

The present invention is to solve the above problems of the prior art, given the number of antennas of the base station, the number of users to be serviced and the transmission SNR given, for more efficient service in downlink (downlink) and uplink (uplink) To provide a transceiver mode selection method.

In order to achieve the above object, a method of selecting a transceiver mode of a base station according to a channel state according to an embodiment of the present invention, (a) the channel state is not good, the current transmission power is less than the first reference transmission power. If not, selecting a transceiver mode using a maximum ratio transmission (MRT) / maximum ratio combining (MRC) scheme; and (b) if the channel state is good above the first reference transmission power, the transmission power. Or selecting the transceiver mode based on the number of users (K) to be serviced, wherein the current transmission power is divided into downlink (P t ) and uplink transmission power (P u ), respectively. The first reference transmit power is considered in consideration of the number of antennas of the base station without considering the number of users, and includes downlink (P cross . DL ) and uplink reference transmit power (P cro). ss .UL ).

In one aspect of the present invention, the step (b) is based on the transmission power (b-1), if the current transmission power is less than the second reference transmission power select the transceiver mode to MRT / MRC method and Selecting the transceiver mode based on the number of users if the current transmission power is equal to or greater than the second reference transmission power; and (b-2) when the number of users is based, the number of users is determined. Selecting the transceiver mode by ZF (Zero Forcing) method when the number of users is less, and selecting the transceiver mode by MRT / MRC method when the number of current users is greater than or equal to the reference number of users. and transmission power are each divided into consideration that the number of the number of antennas of the base station and the user, the downlink (P th. DL) and the uplink based on the transmission power (P th. UL), Group based on the number of users is to be considered an antenna number and a current transmit power of the base station, are each divided into a downlink (K cross. DL) and the uplink based on the number of users (K cross. UL).

In order to achieve the above object, the apparatus for selecting the transceiver mode of the base station according to the channel state according to an embodiment of the present invention, if the channel state is not good, the current transmission power is less than the first reference transmission power, A first mode selection unit for selecting a transceiver mode in a maximum ratio transmission (MRT) / maximum ratio combining (MRC) scheme and a transmission power or service when the channel state is good above the first reference transmission power; And a second mode selector for selecting the transceiver mode based on the number of users (K). The current transmission power is divided into downlink (P t ) and uplink transmission power (P u ), respectively. The first reference transmission power considers the number of antennas of the base station without considering the number of users, and includes downlink (P cross . DL ) and uplink reference. Transmitted power (P cross, UL ) are each classified.

In one aspect of the present invention, when the second mode selection unit selects the transceiver mode based on the transmission power, if the current transmission power is less than the second reference transmission power, the transceiver mode is selected as the MRT / MRC scheme; If the current transmission power is greater than or equal to the second reference transmission power, the transceiver mode is selected based on the number of users, and the second reference transmission power considers the number of antennas of the base station and the number of users. Downlink (P th . DL ) and uplink reference transmit power (P th . UL ), respectively.

In addition, in one aspect of the present invention, when the second mode selection unit selects the transceiver mode based on the number of users, if the number of users is less than the reference number of users, the transceiver mode is ZF (Zero Forcing) scheme. If the number of the current user is greater than or equal to the reference number of users, the transceiver mode is selected by the MRT / MRC method, wherein the number of reference users considers the number of antennas of the base station and the current transmission power. cross .DL ) and the number of uplink reference users (K cross .UL ), respectively.

According to an embodiment of the present invention, given the number of antennas of the base station, the number of users to be serviced, and the transmission SNR in an environment such as MASSIVE MIMO, the service can be more efficiently provided in downlink and uplink. You can select the transceiver mode to provide.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

According to an embodiment of the present invention, given the number of antennas of the base station, the number of users to be serviced, and the transmission SNR in an environment such as MASSIVE MIMO, the service can be more efficiently provided in downlink and uplink. You can select the transceiver mode to provide.
It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "indirectly connected" .

Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

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

1 is a diagram illustrating a configuration of a system for selecting a transceiver mode of a base station according to an embodiment of the present invention.

In the system of FIG. 1, three base stations each having N antennas provide a service to K user terminals 300 (hereinafter referred to as 'users') having one antenna via channel (H) 200. As a MASSIVE MIMO system to provide, three wireless signal processing unit (Radio Unit, hereinafter referred to as "RU") 110 cooperates with one digital signal processing unit (hereinafter referred to as 'DU') (100) Since it transmits at, the same analysis as that of 1 cell MIMO of one cloud base station having M (= N × 3) antennas is possible.

Each base station may include one RU 110 and three RUs 110 may be connected to the DU 100 constituting one cloud base station.

The DU 100 may select a transmit filter F that may maximize performance in the downlink and a receive filter W that may maximize performance in the uplink.

For reference, the precoding matrix of the downlink and the receive combining matrix of the uplink are as follows.

First, during the downlink of the transmission and reception mode selected by the DU (100)

Zero Forcing (ZF)

Figure 112013067333527-pat00001
to,

Maximum Ratio Transmission (MRT)

Figure 112013067333527-pat00002
Each can be represented by

Where f k is the k th column vector of F, H is the K × M channel matrix, and H * is the Hermitian matrix.

For reference, the received signal of the k-th user in downlink may be represented as follows.

Figure 112013067333527-pat00003

Here, g k is a normalized precoding vector, s k is a transmission signal for the k-th user, n k is the noise of the k-th user, P t is the transmission SNR (ratio of transmission power and noise power).

In addition, during the transmission of the transmission mode selected by the DU (100)

Zero Forcing (ZF)

Figure 112013067333527-pat00004
to,

MRC (Maximum Ratio Combining) method

Figure 112013067333527-pat00005
Each can be represented by

For reference, the received signal of the k-th user in the base station in the uplink may be represented as follows.

Figure 112013067333527-pat00006

Where n is noise vecotr, X k is the transmission signal of the k-th user, and P u is the transmission SNR per user.

Hereinafter, the DU 100 selecting the transceiver mode will be described in detail with reference to FIG. 2.

2 is a block diagram illustrating a configuration of an apparatus for selecting a transceiver mode of a base station according to an embodiment of the present invention.

An apparatus for selecting a transceiver mode of a base station according to an embodiment of the present invention may be included in the DU 100 among the components of the system shown in FIG. 1, hereinafter, an apparatus for selecting a transceiver mode of a base station is referred to as a DU (100). ) To explain.

The DU 100 according to an embodiment of the present invention may include a first mode selector 101 and a second mode selector 102.

Referring to each component, the first mode selector 101 sets the transceiver mode to MRT (Maximum Ratio Transmission) / MRC (Maximum) when the current transmission power of the base station is less than the first reference transmission power. Ratio Combining).

In addition, the first mode selector 101 may allow the second mode selector 102 to select a transceiver mode to be described later when the current channel state is good because the current transmit power of the base station is greater than or equal to the first reference transmit power. .

Here, the 'current transmission power' of the base station may be divided by the downlink and uplink, the transmission SNR (hereinafter referred to as 'P t ') in the downlink, the transmission SNR per user in the uplink (hereinafter, 'P u ' may be the current transmit power.

In addition, the 'first reference transmission power' refers to the number of antennas of the base station without considering the number of users in order to increase the sum rate performance, and the downlink reference transmission power (hereinafter referred to as 'P cross . DL ') and up Link reference transmission power (hereinafter referred to as 'P cross . UL ').

For reference, the first reference transmit power P cross . DL in the downlink is

Figure 112013067333527-pat00007
Can be represented as

The first reference transmit power (P cross . UL ) in the uplink is

Figure 112013067333527-pat00008
.

The first mode selector 101 may select the transceiver mode of the base station as the MRT method when the current transmission power P t uses a transmission SNR of less than the first reference transmission power P cross . DL in the downlink . have.

The first mode selecting unit 101 is the current transmit power (P u), the first reference standard transmission power (P cross. UL) When using the transmit SNR is less than, a transceiver mode of the base station MRC scheme in an uplink Can be selected.

In other words, if the current transmission power is less than the first reference transmission power, it means that the current channel state is not good, and the first mode selector 101 changes the transceiver mode of the base station to MRT / By selecting the MRC scheme, the signal of the base station can be strengthened to provide a smooth service.

On the contrary, if the current transmission power is greater than or equal to the first reference transmission power, it means that the current channel state is good, and the first mode selector 101 selects the transceiver mode in the second mode selector 102 described later. You can do that.

On the other hand, the second mode selection unit 102 may select the transceiver mode based on the transmission power or the number of current users when the channel state is good, the current transmission power is greater than the first reference transmission power.

Hereinafter, the transceiver mode selection of the second mode selection unit 102 will be described in detail.

1. Send Power  Transceiver as standard Mode  Selection

If the current transmission power is less than the second reference transmission power, the second mode selection unit 102 selects the transceiver mode as the MRT / MRC method. If the current transmission power is greater than or equal to the second reference transmission power, the second mode selection unit 102 refers to the number of users to be described later. Transceiver mode can be selected by using or ZF method.

Here, the 'second reference transmission power' refers to the number of antennas and the number of users of the base station, and the downlink reference transmission power (hereinafter referred to as' P th . DL ') and the uplink reference transmission power (hereinafter,' P th .UL '.

For reference, the second reference transmit power P th . DL in the downlink is

Figure 112013067333527-pat00009
Can be represented as

The second reference transmit power P th . UL in the uplink

Figure 112013067333527-pat00010
.

The second mode selecting unit 102 to provide the base station having M antennas services to the K users to increase the sum rate performance, in the downlink the current transmission power (P t) and the second reference transmission power When using a transmission SNR of less than (P th . DL ), the transceiver mode of the base station may be selected by the MRT scheme.

Further, a second mode selecting unit 102 if the uplink using transmission SNR is less than the current transmission power (P u) and a second reference transmission power (P th. UL), a transceiver mode of the base station by MRC scheme You can choose.

For reference, the second mode selector 102 uses a transmission SNR of which the current transmission power P t is greater than the second reference transmission power P th . DL in the downlink , or the current transmission power P u in the uplink. ) is the case of using the second reference transmission SNR over the transmission power (P th. UL), may select the transceiver mode of the base station to the ZF method, you may select the transceiver mode based on the number of users which will be described later.

2. Transceiver based on number of users Mode  Selection

As described above, the second mode selection unit 102, when the current transmission power is good or more than the first reference transmission power, or when the current transmission power is more than the second reference transmission power in a good state of the channel, The transceiver mode can be selected based on the number of users.

In this case, the second mode selection unit 102 may select the transceiver mode by the ZF method when the number of current users is less than the reference user number, and select the transceiver mode by the MRT / MRC method when the number of current users is more than the reference user number. .

Here, the number of reference users is taken into account the number of antennas of the base station and the current transmission power, and the number of downlink reference users (hereinafter referred to as' K cross . DL ') and the number of uplink reference users (hereinafter referred to as' K cross . UL ').

For reference, the reference number of users (K cross . DL ) in the downlink is

Figure 112013067333527-pat00011
Can be represented as

The reference number of users in the uplink (K cross . UL ) is

Figure 112013067333527-pat00012
.

The second mode selector 102 provides a reference number of users (K cross . DL) in the downlink when a base station having M antennas serves users with a transmission SNR of P t to improve sum rate performance. Less than), the transceiver mode of the base station may be selected by the ZF scheme, and when the current number of users is greater than the reference number of users (K cross . DL ), the transceiver mode of the base station may be selected by the MRT scheme.

The second mode selecting unit 102 can user the current number of users based on the uplink (K cross. UL), and to select the transceiver mode of the base station to the ZF method, the current number of users based on the number of users less than (K cross DL ) or more, the transceiver mode of the base station can be selected by the MRC scheme.

After all, that the number of current users is less than the reference number of users means that the current channel state has sufficient margin to provide service to the current user. In this case, the second mode selector 102 sets the transceiver mode of the base station to the ZF scheme. It can be selected to minimize the effect of noise added during transmission.

On the contrary, if the number of current users is greater than the reference number of users, since the current channel state does not have enough room to provide service to the current user, the second mode selector 102 changes the transceiver mode of the base station to MRT / MRC. By selecting the method, the signal of the base station can be strengthened so that the service can be provided smoothly.

3 is a flowchart illustrating a process of selecting a transceiver mode of a base station according to an embodiment of the present invention.

Hereinafter, the flowchart of FIG. 3 will be described based on the DU 100 among the components of the system illustrated in FIG. 1.

The DU 100 checks whether the current transmission power P t , P u is less than the first reference transmission power P cross . DL , P cross . UL (S301).

As a result, if the current transmission power (P t , P u ) is less than the first reference transmission power (P cross . DL , P cross . UL ) (channel state is not good), the transceiver mode of the base station is MRT / MRC scheme (S302).

If the result of S301, the current transmission power (P t , P u ) is greater than or equal to the first reference transmission power (P cross . DL , P cross . UL ) (the channel state is good), the DU 100 is in the transceiver mode of the base station. Is selected based on the transmission power or the number of users (S303).

When the transceiver mode of the base station is selected based on the transmission power in S303, the DU 100 determines whether the current transmission power P t , P u is less than the second reference transmission power P th . DL , P th . UL . Check (S304).

As a result of the check, if the current transmission power P t , P u is less than the second reference transmission power P th . DL , P th . UL , the DU 100 selects the transceiver mode of the base station as the MRT / MRC scheme. (S305).

If the result of S304, the current transmit power (P t , P u ) is greater than or equal to the second reference transmit power (P th . DL , P th .UL ), the DU 100 selects the transceiver mode of the base station based on the number of users. However, it is checked whether the current number of users is less than the reference number of users (S306).

For reference, as a result of S304, if the current transmission power (P t , P u ) is greater than or equal to the second reference transmission power (P th . DL , P th .UL ), the DU 100 selects the transceiver mode of the base station by the ZF method. It may be.

As a result of S306 checking, if the current number of users K is less than the reference number of users K cross . DL , K cross . UL , the DU 100 selects the transceiver mode of the base station by the ZF method (S307).

If the S306 check result indicates that the current number of users K is greater than or equal to the reference number of users (K cross . DL , K cross . UL ), the DU 100 selects the transceiver mode of the base station by the MRT / MRC method (S308). .

For reference, when the transceiver mode of the base station is selected based on the number of users in S303, the processes of S306 to S308 may be performed without performing the processes of S304 and S305.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be.

It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

100: digital signal processing part (Digital Unit; DU)
110: radio signal processing part (Radio Unit; RU)
101: first mode selection unit
102: second mode selection unit
200: channel
300: user terminal

Claims (5)

In the method for selecting the transceiver mode of the base station according to the channel state,
(a) selecting a transceiver mode using a maximum ratio transmission (MRT) / maximum ratio combining (MRC) method when the channel state is not good when the current transmission power is less than the first reference transmission power; And
(b) selecting the transceiver mode based on transmission power or the number of users (K) to be serviced when the channel state is good when the current transmission power is greater than or equal to the first reference transmission power;
, ≪ / RTI &
The current transmission power is divided into downlink (P t ) and uplink transmission power (P u ), respectively, and the first reference transmission power considers the number of antennas of the base station without considering the number of users. Transceiver mode selection method, each divided into a link (P cross . DL ) and uplink reference transmit power (P cross . UL ).
The method according to claim 1,
The step (b)
(b-1) When the transmission power is based on
If the current transmission power is less than the second reference transmission power, the transceiver mode is selected by the MRT / MRC scheme. If the current transmission power is greater than the second reference transmission power, the transceiver mode is selected based on the number of users. Making; And
(b-2) when based on the number of users,
If the number of users is less than a reference number of users, the transceiver mode is selected by a zero forcing (ZF) method; and if the number of current users is greater than the number of reference users, selecting the transceiver mode by an MRT / MRC method.
, ≪ / RTI &
The second reference transmission power considers the number of antennas and the number of users of the base station, and is divided into a downlink (P th . DL ) and an uplink reference transmission power (P th . UL ), respectively.
The reference number of users is to be considered an antenna number and a current transmit power of the base station, the downlink (K cross. DL) and the uplink based on the user can in a transceiver mode selection method which are respectively separated by a (K cross. UL).
An apparatus for selecting a transceiver mode of a base station according to a channel state,
A first mode selector configured to select a transceiver mode in a maximum ratio transmission (MRT) / maximum ratio combining (MRC) mode when the current transmission power is less than the first reference transmission power; And
A second mode selector configured to select the transceiver mode based on transmission power or the number of users (K) to be serviced when the current transmission power is equal to or greater than the first reference transmission power;
, ≪ / RTI &
The current transmission power is divided into downlink (P t ) and uplink transmission power (P u ), respectively, and the first reference transmission power considers the number of antennas of the base station without considering the number of users. Transceiver mode selection apparatus, each divided into a link (P cross . DL ) and an uplink reference transmit power (P cross . UL ).
The method of claim 3, wherein
The second mode selector
When the transceiver mode is selected based on the transmission power,
If the current transmission power is less than the second reference transmission power, the transceiver mode is selected by the MRT / MRC scheme. If the current transmission power is greater than the second reference transmission power, the transceiver mode is selected based on the number of users. But
The second reference transmission power takes into account the number of antennas of the base station and the number of users, and is divided into a downlink (P th . DL ) and an uplink reference transmission power (P th . UL ), respectively. Optional device.
The method of claim 3, wherein
The second mode selector
When selecting the transceiver mode based on the number of users,
If the number of users is less than the reference number of users, the transceiver mode is selected by Zero Forcing (ZF) method, and if the number of current users is greater than the number of reference users, the transceiver mode is selected by MRT / MRC method,
The reference number of users is considered in consideration of the number of antennas and the current transmission power of the base station, and is divided into downlink (K cross . DL ) and uplink reference number of users (K cross . UL ), respectively, transceiver mode selection apparatus.
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