WO2012153976A2

WO2012153976A2 - Method for base station transmitting control signal to user equipment in multiple-antenna wireless communication system and apparatus for same

Info

Publication number: WO2012153976A2
Application number: PCT/KR2012/003620
Authority: WO
Inventors: 김학성; 서한별
Original assignee: 엘지전자 주식회사
Priority date: 2011-05-09
Filing date: 2012-05-09
Publication date: 2012-11-15
Also published as: KR20140019386A; WO2012153976A3

Abstract

The present invention relates to a wireless communication system, and more particularly, to a method for a base station transmitting a control signal to a user equipment in a multiple-antenna wireless communication system and an apparatus for same. According to one embodiment of present invention, the method for the base station transmitting the control signal to the user equipment in a multi-input multi-output (MIMO) wireless communication system comprises the following steps: forming a resource element group (REG) in four consecutive resource element units in the ascending order of a sub-carrier index, excluding resource elements (RE) for channel state information reference signals (CSI-RS); allocating a transmission resource to the control signal in the resource element group units; and transmitting the control signal, to which the transmission resource is allocated, to the user equipment, wherein the channel state information reference signal can be defined via eight logical antenna ports.

Description

【Specification】

[Name of invention]

Method for transmitting a control signal from a base station to a terminal in a multi-antenna wireless communication system and apparatus for the same

Technical Field

The present invention relates to a wireless communication system, and more particularly, to a method and a device for transmitting a control signal to a terminal by a base station in a multi-antenna wireless communication system.

Background Art

MIMO (Multiple-Input Multiple-Output) is a method using a plurality of transmission antennas and a plurality of receiving antennas, by this method can improve the transmission and reception efficiency of data. That is, the transmitting end of the wireless communication system can increase capacity and improve performance by using a plurality of antennas at the receiving end. In the following description, MIMO may be referred to as a 'multi-antenna'.

In multi-antenna technology, it does not rely on a single antenna path to receive one premise message. Instead, in multi-antenna technology, data fragments received from multiple antennas are gathered and merged to complete the data. Using multi-antenna technology, it is possible to improve the data rate within a shell area of a specified size or to increase system coverage while guaranteeing a specific data rate. This technique can also be widely used in mobile communication terminals, repeaters, and the like. According to the multiple antenna technology, it is possible to overcome the transmission limit in the mobile communication according to the prior art, which used a single antenna. A schematic diagram of a typical multiple antenna (MIMO) communication system is shown in FIG. In the transmitting end, N _τ transmitting antennas are provided, and in the receiving end, N _R receiving antennas are provided. As such, when a plurality of antennas are used at both the transmitting end and the receiving end, the theoretical channel transmission capacity increases more than when the plurality of antennas are used at either the transmitting end or the receiving end. The increase in channel transmission capacity is proportional to the number of antennas. Therefore, the transmission rate is improved and the frequency efficiency is improved. If the maximum transmission rate when using one antenna is R ₀ , the transmission rate when using multiple antennas is, in theory, the maximum transmission as shown in Equation 1 below. The rate increase can be increased by multiplying the rate R ₀ by Ri. , Where ^ is the lesser of N and _R.

[Equation 1]

For example, in a MIMO communication system using four transmit antennas and four receive antennas, it is theoretically possible to obtain a transmission rate four times higher than that of a single antenna system. Since the theoretical capacity increase of such a multi-antenna system was proved in the mid 90's, various techniques for substantially improving data transmission have been actively studied to date, and some of these technologies have already been used in 3G mobile communication and next generation wireless. It is reflected in various wireless communication standards such as LAN.

The research trends related to multi-antennas to date include the study of information theory axis related to the calculation of multi-antenna communication capacity in various channel environments and multi-access environments, the study of wireless channel measurement and model derivation of multi-antenna systems, and improvement of transmission reliability and transmission. Active research is being conducted from various viewpoints, such as the study of space-time signal isolation technology.

In order to explain the communication method in the multi-antenna system in a more concrete manner, the mathematical modeling may be expressed as follows. As shown in FIG. 1, it is assumed that there are N _τ transmit antennas and N _R I receive antennas. First, referring to the transmission signal, when there are N _T transmit antennas, the maximum transmittable information is N _T , and the transmission information may be represented by an actor as shown in Equation 2 below.

[Equation 2]

S

On the other hand, it is possible to change the transmission power for each ^τ , wherein if each transmission power is ^Γ , it is represented by the following equation 3 if the transmission power is represented by adjusted transmission information &^quot;

[Equation 3]

In addition, when is expressed using the diagonal matrix of the transmission power, it is expressed as Equation 4 below. [

On the other hand, the weight matrix is applied to the information vector ⁵ with the adjusted transmission power to be actually transmitted.

N _T transmitted signals ^! Consider the case where ' ² ' is constructed. Here, the weighting matrix distributes the transmission information to each antenna according to the transmission channel situation.

-^ 1-^-2-X

State plays a role. This transmission signal is obtained by using the vector X. It can be expressed as Equation 5. Where is the weight between the th transmit antenna and the th information. W is called a weight matrix or a precoding matrix.

[Equation 5]

In general, the physical meaning of the rank of the channel matrix is the number of sinners that can send different information in a given channel. Therefore, the tanks in the channel matrix are separated from each other by rows or columns | As defined by the number of sins among the numbers, the rank of the matrix cannot be greater than the number of rows or columns. For example, the rank (H) of the channel matrix H is limited as shown in Equation (6).

[Equation 6]

r nk (Jl) ≤ min (N _r , Ν _Α )

Also, let's define each of the different information sent using the multi-antenna technology as a 'stream' or simply 'stream'. Such a 'stream' may be referred to as a 'layer'. The number of transport streams can then, of course, not be larger than the number of tanks in the channel, which can send different information. Therefore, the channel null H can be expressed as Equation 7 below.

[Equation 7]

# of streams≤ ranfe (H) <min (N _r , N _R )

Where "# of streams" represents the number of streams. On the other hand, it should be noted that one stream may be transmitted through more than one antenna.

There may be several ways of mapping one or more streams to multiple antennas. This method can be described as follows depending on the type of multiple antenna technology. When one stream is transmitted through multiple antennas, it can be seen as a spatial diversity scheme, and when multiple streams are transmitted through multiple antennas, it can be regarded as a spatial multiplexing scheme. Of course, a hybrid form of spatial divergence space multiplexing is also possible.

[Content of invention]

[Problem to solve]

Based on the above discussion, in the multi-antenna wireless communication system The present invention proposes a method for transmitting a control signal to a terminal and a device for the same.

In a multi-input multi-output (IO) wireless communication system according to an aspect of the present invention, a base station transmits a control signal to a terminal, the channel state indicator reference signal (Channel State Information-S; CSI- Forming a resource element group (REG) in units of four resource elements consecutively in ascending order of subcarrier indexes, except for resource elements (RSs) for each resource element group; Allocating a transmission resource to the control signal and transmitting a control signal to which the transmission resource is allocated, to the terminal, wherein the channel state indicator reference signal may be defined through eight logical antenna ports.

In another aspect of the present invention, in a method of transmitting a control signal to a terminal by a base station in a multi-input multi-output (MIMO) wireless communication system, one or more channel state indicator reference signals (Channel State Information) Resource in units of four consecutive resource elements in ascending order of subcarrier index, except for Orthogonal Frequency Division Multiple (OFDM) symbol (OFDM) symbol including Resource Element (RE) for CSI-RS Forming an element group (REG), and allocating a transmission resource to the control signal on a resource element group basis; And transmitting the control signal allocated with the I transmission resource to the terminal, wherein the channel status indicator reference signal may be defined through eight logical antenna ports.

Meanwhile, another aspect of the present invention provides a base station for transmitting a control signal to a terminal in a multi-input multi-output (MIMO) wireless communication system, comprising: a channel state information reference signal (CSI) Except for Resource Elements (REs), a Resource Element Group (REG) is formed in four resource element units consecutive in ascending order of subcarrier indexes, and the resource element group unit. A processor for allocating a transmission resource to the control signal and a transmission module for transmitting the control signal to which the transmission resource is allocated to the terminal, wherein the channel state indicator reference signal may be defined through eight logical antenna ports. have.

Meanwhile, another aspect of the present invention provides a base station for transmitting a control signal to a terminal in a multi-input multi-output (MIMO) wireless communication system, at least one channel state indicator reference signal (Channel State Information-RS) A resource element group (4) in units of four consecutive resource elements in ascending order of subcarrier indexes, except for an Orthogonal Frequency Division Multiple (OFDM) symbol (Symbo) including a Resource Element (RE) for the CSI-RS. Resource Element Group (REG), and a processor for allocating a transmission resource to the control signal on a resource element group basis. In addition to transmitting transmission modes, the channel status indicator reference signal may be defined through eight logical antenna ports.

【Effects of the Invention】

According to an embodiment of the present invention, a base station can effectively transmit a control signal to a terminal in a multi-antenna wireless communication system. The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

【Brief Description of Drawings 、

1 is a block diagram of a general multiple antenna (MIMO) communication system.

FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard.

FIG. 3 is a diagram for describing physical channels used in a 3GPP system and a general signal transmission method using the same.

4 is a diagram illustrating a structure of a radio frame used in an LTE system.

5 is a diagram illustrating a structure of a downlink radio frame used in an LTE system.

6 is a diagram illustrating a structure of an uplink subframe used in an LTE system. 7 is a diagram illustrating various methods of mapping codewords to layers.

FIG. 8 is a diagram illustrating a structure of a reference signal in an LTE system supporting downlink transmission using four antennas.

FIG. 9 is a diagram illustrating the configuration of a relay backlash link and a relay access link in a wireless communication system.

10 is a diagram illustrating an example of relay resource division.

Figure 11 (a) shows the 3GPP Release 8 system. It is a figure which shows a reference signal pattern.

Figure 11 (b) shows the 3GPP Release 9 system or 3GPP Release 10 system. It is a figure which shows a reference signal pattern.

12 shows an example of a general REG indexing order.

13 is a diagram showing the configuration of a CSI-RS in accordance with the present invention.

FIG. 14 is a diagram showing an example of the | REG indexing procedure in the 5 CSI-RS configuration in relation to the present invention.

FIG. 15 is a diagram illustrating an example of an REG indexing order in a 4 CSI-RS configuration in relation to the present invention.

16 illustrates the order of I REG indexing in a 3 CSI-RS configuration in connection with the present invention. It is a figure which shows an example.

FIG. 17 is a view showing another example of an REG indexing order in a 3 CSI-RS configuration according to the present invention.

FIG. 18 is a diagram illustrating another example of an I REG indexing order in a 3 CSI-RS configuration according to the present invention.

FIG. 19 is a diagram illustrating another example of an REG indexing order in a 3 CSI-RS configuration with respect to the present invention 1 ″.

FIG. 20 is a diagram illustrating an example of an REG indexing sequence in a 4 CSI-RS configuration according to the present invention.

21 is a view showing another example of an REG indexing order in a 4 CSI-RS configuration in conjunction with the present invention.

FIG. 22 is a diagram illustrating another example of an REG indexing order in a 4 CSI-RS configuration in relation to the present invention. ^'

FIG. 23 is a view showing another example of an I REG indexing order in a 4 CSI-RS configuration in relation to the present invention.

24 illustrates the I REG indexing order in a 4 CSI-RS configuration in connection with the present disclosure. It is a figure which shows another example.

25 is a diagram illustrating an example of a block diagram of a terminal device according to an embodiment of the present invention.

[Specific contents to perform invention]

By the embodiments of the present invention described with reference to the accompanying drawings below, the configuration, operation and other specifics of the present invention will be readily understood. Embodiments described below are examples in which technical features of the present invention are applied to a 3GPP system.

The present specification describes an embodiment of the present invention using an LTE system and an LTE-A system, but this is an embodiment of the present invention as an example and may be applied to any communication system corresponding to the above definition. In addition, the present specification describes an embodiment I of the present invention on the basis of the FDD scheme, which is an embodiment of the present invention can be easily modified and applied to the H-FDD scheme or the TDD scheme.

FIG. 2 is a diagram illustrating a control plane and a user plane structure of a radio interface protocol between a terminal and an E-UTRAN based on the 3GPP radio access network standard. The control plane is a user equipment (UE) and means a path through which control messages used by the network to manage a call are transmitted. The user plane refers to a path through which data generated at the application layer is transmitted, for example, voice data or Internet packet data. The first layer, the Woolly layer, provides an information transfer service to a higher layer by using a physical channel. The Eolli layer is connected to the upper layer of the Medium Access Control layer through a transport channel. Data is moved between the embedded access control layer and the Euli layer through the transmission channel. Data moves between the transmitter and the physical layer on the receiver side through the wool channel. The physical channel utilizes time and frequency as radio resources. Specifically, the physical channel is modulated in the Orthogonal Frequency Division Multiple Access (OFDMA) scheme in the downlink, and modulated in the Single Carrier Frequency Division Multiple Access (SC-FDMA) scheme in the uplink. Layer 2 I Medium Access Control (MAC) negotiation provides services to the Radio Link Control (RLC) layer, which is a higher layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. The functionality of the RLC layer can also be implemented as a functional block inside the MAC. Layer 2 I The Packet Data Convergence Protocol (PDCP) layer effectively filters IP packets such as IPv4 or IPv6 over narrow bandwidth wireless interfaces. It performs header compression function to reduce unnecessary control information for transmission.

Radio Resource Control (RRC) conflicts at the bottom of the third layer are defined only in the control plane. The RRC layer is responsible for the control of logic channels, transmission channels, and physical channels in connection with configuration, reconfiguration, and release of radio bearers (RBs). RB means a service provided by the second layer for data transmission between the terminal and the network. To this end, the RRC layers of the terminal and the network exchange RRC messages with each other. If there is an RRC connected (RRC Connected) between the UE and the RRC layer of the network, the UE is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode. R C Layer | The upper non-access stratum (NAS) layer performs functions such as session management and mobility management.

One cell constituting the base station (eNB) is set to one of the bandwidth, such as 1.25, 2.5, 5, 10, 15, 20Mhz to provide a downlink or uplink transmission service to multiple terminals. Different cells may be configured to provide different bandwidths.

The downlink transmission channel transmitting data from the network to the terminal is a BCH (Broadcast Channel) transmitting system information, a PCH (paging channel) transmitting a paging message, and a downlink shared channel (SCH) transmitting user traffic or control messages. Etc. In the case of traffic or control messages of a downlink multicast or broadcast service, I may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel transmitting data from the terminal to the network transmits an initial control message. There is a random access channel (RAC), an uplink shared channel (SCH) for transmitting user traffic or control messages. The logical channel that is located above the transmission channel and is mapped to the transmission channel includes a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a multicast control channel (MCCH), MTCH (Multicast Traffic Channel).

When the terminal is powered on or enters a new cell, the terminal performs an initial shell search operation such as synchronizing with the base station (S301). To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station, synchronizes with the base station, and obtains information such as a shell ID. can do. Thereafter, the terminal may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the terminal may receive a downlink reference signal (DL RS) in the initial shell search step to check the downlink channel state.

The terminal that has finished initial cell discovery is more specific by receiving a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the information on the PDCCH. it is able to obtain system information ^'(S302).

On the other hand, when there is no radio resource for the signal transmission or the base station to the base station, the terminal may perform a random access procedure (RACH) for the base station (steps S303 to S306). In this case, the UE transmits a specific sequence to the preamble through a physical random access channel (PRACH) (S303 and S305), and receives a response message for the preamble through the PDCCH and the corresponding PDSCH. (S304 and S306). In case of contention-based RACH, contention resolution procedure may be additionally performed.

After performing the above procedure, the UE performs a PDCCH / PDSCH reception (S307) and a physical uplink shared channel (PUSCH) / physical uplink control channel as a general uplink / downlink signal transmission procedure. Physical Uplink Control Channel (PUCCH) transmission (S308) may be performed. In particular, the terminal receives downlink control information (DCI) through the PDCCH. Here, the DCI includes control information such as resource allocation information for the terminal, and the format is different depending on the purpose of use.

Meanwhile, the control information transmitted by the terminal to the base station through the uplink or received by the terminal from the base station includes a downlink / uplink AC / NACK signal, a channel quality indicator (CQI), Precoding Matrix Index (PMI), ank indicator (RI) and the like. In the 3GPP LTE system, the UE may transmit control information such as the above-described CQI / PMI / RI through PUSCH and / or PU ⁽ ± H).

4 is a diagram illustrating a structure of a radio frame used in an LTE system.

4, a radio frame is 10 ms (327200 _s ) | Has a length

It consists of 10 equally sized subframes. Each subframe has a length of lms and consists of two slots. Each pilot has a length of 0.5 ms (15360-T _s ). Here, T _s represents the live fling time and is expressed as Ts = l / (15 kHz x 2048) = 3.2552 x l- ⁸ (about 33 ns). The pilot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. In the LTE system, one resource block includes 12 subcarriers x7 (6) OFDM symbols. The transmission time interval (TTI), which is the unit time over which data is transmitted, is one or more | It may be determined in units of subframes. The above-described radio frame I structure is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, and the number of OFDM symbols included in the slot may be variously changed.

5 is a diagram illustrating a downlink radio frame structure used in the LTE system.

Referring to FIG. 5, the downlink radio frame includes 10 subframes having an equal length. In the 3GPP LTE system, a subframe is defined as a basic time unit of packet scheduling for the entire downlink frequency. Each subframe is divided into a time interval (control region, contr region) for scheduling information and other control information transmission, and a time interval (data region, data region) for downlink data transmission. The control region begins with the first OFDM symbol of the subframe and includes one or more OFDM symbols. The size of the control region may be set independently for each subframe. The control region is used to transmit the L1 / L2 control signal. The data area is used to transmit downlink traffic.

FIG. 6 is a diagram illustrating a structure of an uplink subframe used in an LTE system. Referring to FIG. 6, a subframe 600 having an lms length, which is a basic unit of LTE uplink transmission, is composed of two 0.5 ms pilots 601. Assuming the length of a Normal Cyclic Prefix (CP), each pilot consists of seven symbols 602 and one symbol corresponds to one SC-FDMA symbol. The resource block 603 is a resource allocation Danwoo I corresponding to 12 subcarriers in the frequency domain and one slot in the time domain. The structure of the uplink subframe of LTE is largely divided into a data region 604 and a control region 605. Here, the data area means a series of communication resources used for transmitting data such as voice and packet transmitted to each terminal, and corresponds to the remaining resources except for the control area in the subframe. Control area each It refers to a series of communication resources used for transmitting a downlink channel quality report from a terminal, receiving ACK / NACK for a downlink signal, an uplink scheduling request, and the like.

As shown in the example shown in FIG. 6, an area 606 in which a sounding reference signal can be transmitted in one subframe is an interval in which the last SC-FDMA symbol is located on the time axis in one subframe. On frequency, it is transmitted through the data transmission band. Sounding reference signals of multiple UEs transmitted in the last SC-FDMA of the same subframe can be distinguished from cyclic shift values. In addition, an area 507 in which a DM (Demodulation) -Reference Signal is transmitted in one subframe includes a middle SC-FDMA symbol, that is, a fourth SC-FDMA symbol and an eleventh SC-FDMA symbol in one slot. It is a section with, and is transmitted through the data transmission band on the frequency.

7 is a diagram illustrating various methods of mapping codewords to layers.

Referring to FIG. 7, there are various methods for mapping codewords to layers. When MIMO transmission is performed, the transmitter must determine the number of codewords according to the layer. The number of codewords and layers refers to the number of different data sequences and the channel rank, respectively. The transmitting end needs to map the codeword to the layer as appropriate.

Hereinafter, the reference signal will be described in more detail. In general, for signal measurement, a reference signal that is known to both the transmit and receive axes together with the data is transmitted from the transmit axis to the receiver. These reference signals inform the modulation technique as well as the channel measurement, so that the demodulation process is performed. The reference signal is divided into a dedicated RS (DRS) for a base station and a specific UE, that is, a common RS (CRS), which is a shell-specific reference signal for all UEs in the MS. In addition, the cell-specific reference includes a reference signal for measuring the CQI / PMI / RI in the terminal to report to the base station, this is called a Channel State Information-RS (CSI-RS).

FIG. 8 is a diagram illustrating a structure of a reference signal in an LTE system supporting downlink transmission using four antennas. In particular, FIG. 8 (a) shows a case of a normal cyclic battery, and FIG. 8 (b) shows a case of an extended cyclic battery. Referring to FIG. 8, 0 to 3 described in the grating mean a common reference signal (CRS), which is a cell-specific reference signal transmitted for channel measurement and data demodulation corresponding to each of antenna ports 0 to 3, The CRS, which is the cell specific reference signal, may be transmitted to the terminal not only in the data information region but also in the control information region.

In addition, 'D' described in the grid means a downlink DM-RS (DM-RS), which is a UE-specific RS, and supports single antenna port transmission through a data region, that is, a PDSCH. The terminal is signaled whether the terminal specific RS exists through a higher layer. On the other hand, the RS mapping rule to the resource block (RB) can be expressed as Equation 8 to Equation 10 below. Equation 8 is an expression for representing the CRS mapping rule. Equation 9 is a formula for representing a mapping rule of a DRS to which a general CP is applied, and Equation 10 is a formula for representing a mapping rule as a DRS to which an extended CP is applied.

[Equation 8]

= v _dlift ) mod6

m

0 if p Oand / = O

3 if p 0 and / ≠ 0

3 if p land / = 0

0 if p land / ≠ O

3 (i _s mod 2) if p 2

3 + 3 (n _s mod 2) if p 3 v _sh = N ^ mod6

[Equation 9]

RB KB

') ™ od N + N n PR

3 I '= 0

6 V = 1

2 / '= 2

5 I '= 3

^{m 0,1, -, SAT ^ 21} - 1

shift mod 3

[Equation 10] (r) 画 i + ^"n rsB

3 «'+ v 献 if I = ： 4

3m '+ (2 +) mod 3 if / 二二 1

〜

1 / '二 1

o

m 0 ₃ 1 ₃ . ₃ 4N ^ -1

cell

V shift

mod 3

In Equations 8 to 10, k and p represent subcarrier indexes and antenna ports, respectively. N ^RB , ns, and N represent the number of downlink RBs, the number of slot indices, and the number of shell IDs, respectively. The position of RS depends on the value of V _{shift in} terms of frequency domain. The LTE-A system, which is a standard for the next generation mobile communication system, is expected to support CoMP (Coordinated Multi Point) method, which was not supported in the existing standard, to improve data transmission. Here, the CoMP system refers to a system in which two or more base stations or black shells communicate with each other in cooperation with each other in order to improve communication performance between a terminal and a base station (shell or sector) in a shadow area.

CoMP can be divided into CoMP-Joint Processing (CoMP-JP) and CoMP-Coordinated Scheduling / beamforming (CoMP-CS / CB). .

In the case of downlink, in a joint processing (CoMP-JP) scheme, a terminal may simultaneously receive data from each base station performing CoMP and may improve reception performance by combining signals received from each base station. . In contrast, in cooperative scheduling / beamforming scheme (CoMP-CS), the terminal may receive data through one base station instantaneously through beamforming.

In the case of uplink, in the joint processing (CoMP-JP) scheme, each base station may simultaneously receive a PUSCH signal from the terminal. In contrast, in a cooperative scheduling / beamforming scheme (CoMP-CS), only one base station receives a PUSCH, where the decision to use the cooperative scheduling / beamforming scheme is determined by cooperative cells (black base stations). do. On the other hand, when the channel state is poor between the base station and the terminal, a repeater (Relay Node, RN) between the base station and the terminal may be provided to provide the terminal with a better wireless channel state. In addition, by introducing and using a repeater in a shell boundary region having a bad channel state from the base station, it is possible to provide a faster data channel and expand the cell service area. As such, the repeater is currently widely used as a technique introduced to solve the radio shadow area in a wireless communication system.

In the past, the approach has evolved into a more intelligent form than that of the repeater, which simply amplifies and transmits the signal. Furthermore, the repeater technology is a necessary technology for increasing the base station and reducing the cost of maintaining the backhaul network while increasing the service coverage and data realization in the posture mobile communication system. As the repeater technology gradually develops, it is necessary to support the repeater used in the conventional wireless communication system in the new wireless communication system.

Two types of 3GPP LTE-A (3rd Generation Partnership Project Long Term Evolution-Advanced) systems have the role of forwarding the link connection between the base station and the terminal to the repeater and have different properties in each uplink and downlink carrier frequency band. Will be applied. The link link portion established between the base station and the repeater I link is defined as a backhaul link. Transmission using Frequency Division Duplex (FDD) or TDD (Time Division Duplex) using downlink resources is called backhaul downlink, and transmission is performed using FDD or TDD using uplink resources. What is done may be expressed as a backhaul uplink.

9 is a diagram illustrating the configuration of a relay backhaul link and a relay access link in a wireless communication system.

Referring to FIG. 9, two types of links having different attributes are applied to respective uplink and downlink carrier frequency bands as a repeater is introduced to forward a link between a base station and a terminal. The connection link portion established between the base station and the repeater is defined and represented as a relay backhaul link. If the backhaul link is transmitted using downlink frequency band (for Frequency Division Duplex, FDD) or downlink subframe (for Time Division Duplex, TDD) resources, then backhaul downlink When transmission is performed using an uplink frequency band or an uplink subframe (for TDD) resources, it may be expressed as a backhaul uplink.

On the other hand, the part of the connection link established between the relay O series of terminals is defined and represented as a relay access link. If the relay access link uses downlink frequency band (if FDD) or downlink subframe (if TDD) resources, If the transmission is made by using the access downlink (access downlink) and the uplink frequency band (in case of FDD I) or uplink subframe (in case of TDD I) when the transmission is made using the resource uplink (access uplink) Can be.

The relay (RN) may receive information from the base station through the relay backhaul downlink, and may transmit information to the base station through the relay backlink uplink. In addition, the repeater may transmit information to the terminal through the relay access downlink, and may receive information from the terminal through the relay access uplink.

On the other hand, in relation to the use of the band (or spectrum) of the repeater, the case in which the backhaul link operates in the same frequency band as the access link is called 'in-band', and the frequency band in which the backhaul link and the access link are different. The case of operating at is called 'out-band'. In both in-band and out-band cases, terminals operating according to an existing LTE system (eg, release-8) (hereinafter referred to as legacy terminals) should be able to access the donor shell.

Depending on whether the terminal recognizes the repeater, the repeater may be classified as a transparent repeater or a non-transparent repeater. A transparent means a case in which a terminal does not recognize whether it communicates with a network through a repeater, and a non-transient means a case in which a terminal recognizes whether a terminal communicates with a network through a repeater.

With regard to the I control error, the repeater may be divided into a repeater configured as part of a donor cell or a repeater controlling a shell by itself.

A repeater configured as part of the donor cell may have a repeater identifier (ID), but does not have a repeater's own cell identity. When at least a part of RRM (Radio Resource Management) is controlled by the base station to which the donor shell belongs (although the RRM | remaining parts are located at the repeater), the relay is configured as part of the donor shell. Preferably, such a repeater can support the legacy terminal. For example, smart repeaters, decode-and-forward relays, various types of L2 (second layer) repeaters and type-2 repeaters are such repeaters. .

In the case of a transfer of control of himself Shell, a repeater is provided with one or more than ^"dollars of control cells and a unique sound layer cell child indenter tee of each cells is controlled to lead i repeaters, the same RRM mekeo nijeung It is available. From a terminal perspective, there is no difference between accessing a cell controlled by a repeater and accessing a cell controlled by a general base station. Preferably, the shell controlled by this repeater can support legacy terminals. For example, self-backhauling repeaters, L3 (third layer) repeaters, type-1 repeaters and type-la repeaters are such repeaters. The type-1 repeater is an in-band repeater that controls a plurality of cells, each of which appears to be a separate cell that is distinct from the donor cell from the terminal's point of view. In addition, the plurality of cells have their own physical cell IDs (defined in LTE Release-8), and the repeater may transmit its own synchronization channel, reference signal, and the like. In case of single-cell operation, the terminal may receive scheduling information and HARQ feedback directly from the repeater and transmit its own control channel (scheduling request (SR), CQI, AC / NACK, etc.) to the repeater. In addition, the type-1 repeater is seen as a legacy base station (a base station operating in accordance with the LTE Realize-8 system) to legacy terminals (terminals operating in accordance with the LTE Series 8 system). That is, backward compatibility. On the other hand, for terminals operating in accordance with the LTE-A system, the type-1 repeater can be seen as a different base station than the legacy base station, it can provide a performance improvement.

The type-la repeater has the same features as the type-1 repeater described above in addition to operating out-band. The operation of the type-la repeater may be configured to neglect or eliminate the impact on L1 (first tradeoff) operation.

The type-2 repeater is an in-band repeater and does not have a separate physical shell ID and thus does not form a new cell. The type-2 repeater is transparent to the legacy terminal, and the legacy terminal is not aware of the existence of the type-2 repeater. Type-2 repeaters may transmit PDSCH, but at least do not transmit CRS and PDCCH.

On the other hand, in order for the repeater to operate in-band, some resources in time-frequency space must be reserved for the backhaul link and these resources can be set to not be used for the access link. This is called resource partitioning.

The general principle of resource partitioning in a repeater can be explained as follows. Hundred days downlink and access downlink can be multiplexed in a Time Division Multiplexing (TDM) scheme on one carrier frequency (ie, only one of the backhaul downlink or access downlink is active at a particular time). . Similarly, the 100 day uplink and access uplink may be multiplexed in a TDM manner on one carrier frequency (ie, only one of the backhaul uplink or access uplink is activated at a particular time).

Backhaul link multiplexing in FDD may be described as backhaul downlink transmission is performed in the downlink frequency band, and 100 days uplink transmission is performed in the uplink frequency band. Backhaul multiplexing in TDD may be described that backhaul downlink transmission is performed in an I downlink subframe by a base station and a repeater, and backhaul uplink transmission is performed in an uplink subframe of a base station and a repeater.

In the case of an in-band repeater, for example, when a back-haul downlink reception from a base station and an access downlink transmission to a terminal are simultaneously performed in a predetermined frequency band, a signal transmitted from a transmitting end of the repeater is received at the receiving end of the repeater. Can be received at the repeater Signal interference or RF jamming can occur at the RF front-end. Similarly, if the transmission of the uplink to the base station and the reception of the uplink of the access uplink from the terminal in a predetermined I frequency band are simultaneously performed, signal interference may occur in front of the repeater I RF. Thus, in a repeater, I simultaneous transmission and reception in one frequency band is set up with sufficient separation (e.g., ground / underground) between the receiving and transmitting signals (e.g., ground / underground). If not provided, it is difficult to implement.

One way to solve the problem of signal interference such as Iosop is to allow the repeater to operate so as not to send a signal to the terminal while receiving a signal from the donor cell. That is, a gap can be created in the transmission from the repeater to the terminal, and during this gap, the terminal (including the legacy terminal) can be set so as not to expect any transmission from the repeater. This gap can be set by configuring a Multicast Broadcast Single Frequency Network (MBSFN) subframe.

10 is a diagram illustrating an example of relay resource division.

In FIG. 10, a downlink (ie, access downlink) control signal and data are transmitted from a relay to a terminal as a first subframe, and a second subframe is a control region of a downlink subframe as an MBSFN subframe. In the control signal is transmitted from the repeater to the terminal, but no transmission is performed from the repeater to the terminal in the remaining region of the downlink subframe. In the case of the legacy terminal, since the transmission of the physical downlink control channel (PDCCH) is expected in all downlink subframes (in other words, the repeater receives the PDCCH in the legacy subframes of the legacy terminals in its own area). It is necessary to support to perform the measurement function), for the correct operation of the legacy terminal it is necessary to transmit the PDCCH in all downlink subframes. Thus, even on a subframe (second subframe 1020) configured for downlink (i.e., backhaul downlink) transmission from the base station to the repeater, low N (N = 1, 2 or 3) OFDM symbols of the subframe In the interval, the repeater needs to perform access downlink transmission rather than receiving the backhaul downlink. On the other hand, since the PDCCH is transmitted from the repeater to the terminal in the control region of the second subframe, the glacier in the repeater may provide backward compatibility with the legacy terminal. In the remaining areas of the second subframe, the repeater may receive the transmission from the base station while no transmission is performed from the repeater to the terminal. Therefore, through such a resource partitioning scheme, it is possible to prevent access downlink transmission and 100 days downlink reception from being simultaneously performed in the in-band repeater.

The second subframe using the MBSFN subframe will be described in detail. The control region of the second subframe may be referred to as a relay non-hearing section. In the repeater non-rat section, the repeater receives the access downlink signal without receiving the backhaul downlink signal. It means the interval to transmit. This interval may be set to 1, 2 or 3 OFDM lengths as described above. In the repeater non-cheong I section, the repeater may perform access downlink transmission to the terminal and receive the backhaul downlink from the base station in the remaining areas. At this time, since the repeater cannot simultaneously transmit and receive in the same frequency band, it takes time for the repeater to switch from the transmission mode to the reception mode. Therefore, the guard time GT needs to be set so that the repeater performs the transmission / reception mode switching in the first partial section of the backhaul downlink reception region. Similarly, even when the repeater operates to receive the backhaul downlink from the base station and transmit the access downlink to the terminal, a guard time GT for the reception / transmission mode switching of the repeater may be set. The length of this guard time can be given as a time domain value, for example k (k> l) time samples (Ts), or as one or more OFDM symbol lengths. It may be set. Alternatively, when the repeater backhaul downlink subframe is set to be continuous or according to a predetermined subframe timing alignment relationship, the guard time of the last part of the subframe may not be defined or set. In order to maintain backward compatibility, such guard time may be defined only in a frequency region configured for 100 days of downlink subframe transmission (when a guard time is set in an access downlink period, legacy terminals cannot be supported). . In the backhaul downlink reception interval excluding the guard time, the repeater may receive the PDCCH and the PDSCH from the base station. This may be expressed as an R-PDCCH (Relay-PDCCH) and an R-PDSCH (Relay PDSCH) in the sense of a relay dedicated physical channel.

On the other hand, the repeater can operate as a terminal. The mode in which the repeater operates as a terminal may be called a user mode.

When the repeater operates as a terminal, the R-PDCCH may be represented as an E-PDCCH. In addition, when the repeater operates as a terminal, the R-PDSCH may be represented as an E-PDSCH. In this case, the E-PDCCH or the E-PDSCH may be mapped to resources without considering slots.

The basic unit of the R-PDCCH and the inter- glacier together with the R-PDCCH is called R-REG. In the LTE system, the REG is composed of four I REs, but the R-REG of the backhaul downlink for the relay node may be configured the same or differently.

In addition, when the repeater operates as a terminal, the unit may form an E-PDCCH and interleaver with multiple E-PDCCHs may be called E-REG or REG.

Figure 11 (a) shows the 3GPP Release 8 system. 11 shows a reference signal pattern, and FIG. 11B shows a reference signal pattern in a 3GPP release 9 system or a 3GPP release 10 system. Referring to (a) of FIG. 11, CRSs exist for antenna ports 0, 1, 2, and 3, respectively. The peculiarity is that RE is assigned to the CRS for antenna ports 0 and 1. The number of REs allocated to the CRSs is different from each other. In particular, there are many REs allocated to the CRSs at OFDM symbol indexes # 0 and # 1 that cannot be used as backhaul resources.

11 (b) shows a case in which the DM-RS is added and symbol indexes # 0 to # 2 cannot be used for backhull data transmission, but the number of unavailable symbols may vary.

12 is a diagram illustrating a general REG indexing order.

Referring to FIG. 12, REG indexing is generally performed in a time-first manner such as (a) or a frequency-first method such as (b) an offense. Time-first black may also be considered a hybrid method of performing frequency-first indexing.

On the other hand, it is an object of the present invention to provide a method of mapping the R-PDCCH to the REG. Another object of the present invention is to provide a method of mapping an E-PDCCH to a REG when the repeater operates as a terminal.

There are various ways to map R-PDCCH to REG using REG concept. Considerations in REG mapping include CRS and CSI-RS.

The RE in which the CRS is present may be considered as unavailable RE and may be excluded from the R-PDCCH mapping.

In addition, the RE positioned by the CSI-RS may be considered as unavailable RE and may be excluded from the R-PDCCH mapping.

On the other hand, the CSI-RS may assume that all 8 ports REs are unavailable REs and may exclude them from the R-PDCCH mapping under the assumption that all 8 ports exist.

In particular, a zero power RE muted in the CSI-RS pattern may also be considered as unavailable RE and may be excluded from the R-PDCCH mapping.

However, the present invention is not limited to the above description, and the CSI RS configuration that is actually transmitted may be applied to a configuration different from the 8 ports assumed above.

First, the CSI-RS may be configured as shown in FIG. 13. Referring to FIG. 13, 8 port CSI-RS [-configure] may be transmitted to 5 different locations in total.

. In the present invention, if DL resource assignment is transmitted to the first slot and the UL scheduling grant is transmitted to the second slot under the assumption of the 8 port CSI-RS shown in FIG. 13, the R-PDCCH is mapped in REG units in order. Provide a way to do it.

However, as described above, when the repeater operates as a terminal, the R-PDCCH may be represented by an E-PDCCH, and when the repeater operates as a terminal, the R-PDSCH may be represented by an E-PDSCH. In addition, the E-PDCCH or the E-PDSCH may be mapped to resources without considering slots. Hereinafter, a method of mapping the R-PDCCHs in order of REG units will be described in detail with reference to FIGS. 14 to 24.

FIG. 14 is a diagram illustrating an example of an REG indexing order in a 5 CSI-RS configuration with respect to the present invention I ″.

Referring to FIG. 14, the first slot includes a REG configuration including CRS and an REG configuration including 8 port CSI-RS.

That is, 6 consecutive REs can be bundled into one REG and used for REG indexing.

In the case of indexing in this manner, the REG index may be assigned as illustrated in the first slot of FIG. 14.

In the second slot, there is a CSI-RS transmission symbol consisting of only CSI-RS REs in symb # 9 and # 10.

In this case, there is no REG configuration or REG indexing for these two symbols.

However, since CSI-RS of symbols # 12 and # 13 only sleep 4RE per symbol, 6 consecutive REs including 2RE can be configured as one REG.

On the other hand, Figure 15 is the REG indexing in the configuration of 4 CSI-RS configuration in symb # 9, # 10, # 12 and # 13 | An example is shown.

. 16 illustrates an example of an REG indexing sequence in a 3 CSI-RS configuration in symb # 9 and # 10.

Next, FIG. 17 illustrates an example in which three CSI-RSs are configured over the first slot and the second slot.

In this case, since there is a requirement to configure the R-PDCCH REG in symbols # 9 and # 10, 6 consecutive REs may be configured as one REG to perform indexing as shown. 18 illustrates the I REG indexing order in a 3 CSI-RS configuration. Another example is shown.

19 shows another example of the | REG indexing order in the 3 CSI-RS configuration with respect to the present invention I ″.

20 illustrates a case where four CSI-RSs are configured.

In this case, if there is no CSI-RS of the first slot, or if there are no CSI-RSs of symbols # 12 and # 13, three REGs per OFDM symbol are configured as in symbol # 4.

In FIG. 20, 6 consecutive REs are configured as one REG to generate 2 REGs.

In particular, when two CSI-RSs are configured in symbols # 9 and # 10 as shown in FIG. 20, it may be difficult to use the R-PDCCH because the remaining two pairs of 2 REs are far from each other. .

In addition, FIG. 23 is a block of SFBQSpace Frequency Block Coding) in units of 2 REs. Assuming a mapping case, one more REG can be added to symbol # 9 and # 10.

The 3GPP LTE standard uses Space Frequency Block Coding (SFBC), a frequency domain version of STBQSpace Time Block Code, and Space Frequency Block Coding (SFBC) operates in pairs of adjacent subcarriers. Two transmission antennas are defined for them. If four transmission antennas are applied, a combination of SFBC and frequency swept by transmission diversity can be used.

22 illustrates another example of an REG indexing order in a 4 CSI-RS configuration in connection with the present invention.

Meanwhile, FIG. 23 shows two symbols of symbol # 9 and # 10 | 8 port CSI-RS RE is assumed.

In addition, FIG. 24 shows another example of an REG indexing order in a 4 CSI-RS configuration with respect to the present invention f.

In this case, in order to use four available REs existing in the corresponding OFDM, 12 consecutive REs may be bundled and used as one REG.

In this case, the corresponding REG index may be 2 and 3, respectively. In addition, a method of using only four available bundles may also be used.

23 is the same as the current REG indexing. 24 shows CSI-RS | Because the REG is configured without the location, the REG index is pushed backwards, and the REG index is # 5 and # 6.

Therefore, REG is composed of 4 REs excluding RS RE, and may include 4 consecutive Res, 6 consecutive REs, and 12 consecutive REs if RS RE is included.

In REG indexing, it is assumed that indexing is performed considering RS location.

When REF is composed of only 4REs consecutively available, excluding RS REs, when the time-first indexing method is applied, the REG index order is different from the drawing.

Meanwhile, according to another embodiment of the present invention, R-PDCCH REG mapping may be performed according to the following method.

First, as shown in FIGS. 17 to 19, when one or more 8 port CSI-RSs should be configured in symbol # 9 and # 10 (actual transmission may be different), R-PDCCH is mapped to a corresponding subframe. The method may be applied.

In addition, as shown in FIGS. 17 to 19, when one or more 8 port CSI RSs are configured in symbol # 9 and # 10 (RS may be configured), the R-PDCCH is mapped to the corresponding slot. An alternative method may be used.

In addition, as shown in Figs. 17 to 19, I " If it is supposed to be configured (actual transmission may be different), a method of not mapping the R-PDCCH to the corresponding OFDM symb may be used.

First, when it is assumed that two or more 8 port CSI-RSs are configured in symbol # 9 and # 10 as shown in FIGS. 20 to 22 (actual transmission may vary), the R-PDCCH is not mapped to the corresponding subframe. May be applied.

Also, if it is necessary to assume that two or more 8 port CSI-RSs are configured in symbol # 9 and # 10 as shown in FIGS. 20 to 22 I "(actual transmission may be different), the corresponding R-PDCCH in the corresponding slot. May be used.

20 to 22, two or more symbs # 9 and # 10 | If it is necessary to assume that 8-port CSI-RS is configured (actual transmission may be different), a method of not mapping an R-PDCCH to a corresponding OFDM symb may be used.

First, if it is necessary to assume that three or more 8 port CSI-RSs are configured in symbol # 9 and # 10 as shown in FIGS. 14 to 16 and I "(actual transmission may be different), the R-PDCCH is assigned to the corresponding subframe. A method that does not map can be applied.

In addition, if it is necessary to assume that two or more 8 port CSI-RSs are configured in symbols # 9 and # 10 as shown in FIGS. 14 to 16 (actual transmission may be different), the R-PDCCH in the corresponding slot. May be used.

14 to 16, two or more symbols # 9 and # 10 may be used. If it is assumed that 8 port CSI-RS is configured (actual transmission may be different), a method of not mapping an R-PDCCH to the corresponding OFDM symbd may be used.

Meanwhile, in the above description of the present invention, the REG indexes of the first and second slots are independently defined. However, depending on the implementation, it is also possible to integrate two slots and index into one REG index.

In addition, when the R-PDCCH is a new type of 1 PDCCH mapped over two slots, it is preferable to index both slots with one REG index.

In addition, as described above, when the repeater operates as a terminal, the R-PDCCH is set to E-.

It may be represented by PDCCH, and the R-PDSCH may be represented by E-PDSCH. In addition, the E-PDCCH or the E-PDSCH may be mapped to resources without considering slots.

25 illustrates a block diagram of a terminal device according to an embodiment of the present invention. Referring to FIG. 25, the terminal device 1200 includes a processor 1210, a memory 1220, an RF module 1230, a display module 1240, and a user interface module 1250.

The terminal device 1200 is shown for convenience of description and some models may be omitted. In addition, the terminal device 1200 may further include necessary modules. In addition, in the terminal device 1200, some modules may be divided into more detailed modules. The processor 1210 is configured to perform an operation according to the embodiment of the present invention with reference to the drawings.

In detail, the processor 1210 may perform an operation required to multiplex the control signal and the data signal. Detailed operations of the processor 1210 may refer to the contents described with reference to FIGS. 1 to 30.

The memory 1220 is connected to the processor 1210 and stores an operating system, an application, a program code, data, and the like. The RF modules 1230 are connected to the processor 1210 and perform a function of converting a baseband signal into a wireless signal or converting a wireless signal into a baseband signal. To this end, the F modules 1230 perform analog conversion, amplification, filtering and frequency up-conversion, or their reverse processes. The display module 1240 is connected to the processor 1210 and displays various information. The display module 1240 can use well-known elements such as, but not limited to, Liquid Crystal Display (LCD), Light Emitting Diode (LED), and Organic Light Emitting Diode (OLED)! ”. 1250 is coupled to processor 1210 and may be configured with a combination of well-known user interfaces such as keypads, touch screen contours, and the like.

Embodiments described above are the components of the present invention and specific combinations of certain forms. Each component or feature is to be considered optional unless stated otherwise. Each component or specific may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention. The order of the operations described in the embodiments of the present invention may be changed. Some configurations or features of one embodiment may be included in another embodiment, or may be associated with corresponding configurations or features of another embodiment. It is evident that the embodiments may be incorporated into claims that do not have an explicit citation relationship in the claims, or may be incorporated into new claims by post-application correction.

In this document, embodiments of the present invention have been described mainly based on the data transmission and reception relationship between the terminal and the base station. In this document, a specific operation described as performed by a base station may be performed by an upper node in some cases. That is, it is apparent that various operations performed for communication with the terminal in a network including a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. The base station is a fixed station, Node B, eNode B (eNB), access Can be substituted by terms such as access point. In addition, the terminal may be substituted by terms such as a user equipment (UE), a mobile station (MS), and a mobile subscriber station (MSS).

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. For implementation in hardware, one embodiment of the present invention provides one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs. (field programmable gate arrays), a processor, a controller, a microcontroller, a microprocessor, or the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of modules, procedures, functions, etc. that perform the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may exchange data with the processor by various means which are already known inside or outside the processor.

It will be apparent to those skilled in the art that the present invention can be reconstituted in a multi-wheel specific form without departing from the features of the present invention. Therefore, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope I of the invention are included in the scope of the invention.

Industrial Applicability

In the multi-antenna wireless communication system as described above, a method for transmitting a control signal to a relay node and a device for the base station have been described with reference to an example applied to a 3GPP LTE system. It is possible to apply to.

Claims

[Patent Claims]

[Claim 11

A method for transmitting a control signal from a base station to a terminal in a multi-input multi-output (MIMO) wireless communication system,

Resource element group in units of four consecutive resource elements in ascending order of subcarrier index, except for Resource Element (RE) for Channel State Information Reference Signal (CSI-RS). Element Group, REG);

Allocating a transmission resource to the control signal on a resource element group basis; And transmitting a control signal allocated with the transmission resource to the terminal, wherein the channel state indicator reference signal is defined through eight logical antenna ports.

[Claim 2]

The method of claim 1,

And the resource element group specifies that indexing is performed in a time-first manner.

[Claim 3]

The method of claim 2,

The resource element group is indexed (indexing) is performed on a per-slot basis, control signal transmission method.

[Claim 4]

The method of claim 1,

And the resource element for the channel status indicator reference signal includes a resource element for the channel status indicator reference signal with an assigned transmission power of zero.

[Claim 5]

The method of claim 4, wherein

And specifying a channel status indicator reference signal of which the allocated transmission power is 0 is a channel status indicator creation signal of at least one neighboring base station.

[Claim 6]

The subcarrier is a subcarrier except for an Orthogonal Frequency Division Multiple (OFDM) symbol (Symb) that includes a Resource Element (RE) for one or more Channel State Information Reference Signals (CSI-RS). 4 resources in a row in ascending order Forming a resource element group (REG) in element units; Allocating a transmission resource to the control signal on a resource element group basis; And transmitting a control signal allocated with the transmission resource to the terminal, wherein the channel state indicator reference signal is defined through eight logical antenna ports.

[Claim 7]

The method of claim 6,

Wherein the excluded OFDM symbol comprises a resource element for one, two or three or more channel status indicator reference signals.

[Claim 8]

The method of claim 6,

And the resource element group is indexed in a time-first manner.

[Claim 9]

The method of claim 6,

And the resource element for the channel state indicator reference signal includes a resource element for the channel state indicator reference signal with an allocated transmission power of zero.

[Claim 10]

In the base station for transmitting a control signal to a terminal in a multi-input multi-output (IO) wireless communication system,

Resource element group in units of four consecutive resource elements in ascending order of subcarrier index, except for Resource Element (RE) for Channel State Information Reference Signal (CSI-RS). An element group (REG), and allocates a transmission resource to the control signal on a resource element group basis; And

And a transmission module for transmitting a control signal allocated with the transmission resource to the terminal, wherein the channel state indicator reference signal is defined through eight logical antenna ports.

[Claim 11]

The method of claim 10,

And the resource element group is indexed in a time-first manner.

[Claim 12]

The method of claim 11, The resource element group is characterized in that the indexing (indexing) is performed in units of slots.

[Claim 13]

The method of claim 10,

The resource element for the channel state indicator reference signal includes a resource element for the channel state indicator reference signal with an allocated transmit power of zero.

[Claim 14]

The method of claim 13,

The channel status indicator reference signal with the allocated transmission power equal to 0 may be a channel status indicator reference signal of at least one neighboring base station.

[Claim 15]

In the base station for transmitting a control signal to a terminal in a multi-input multi-output (IMO) wireless communication system,

Subcarrier, except for an Orthogonal Frequency Division Multiple (OFDM) symbol containing a Resource Element (RE) for at least one I Channel State Indicator (CSI-RS) Index | A processor configured to form a resource element group (Resource Element Group, REG) in units of four consecutive resource elements in ascending order, and allocate a transmission resource to the control signal in units of the resource element group; And

[Claim 16]

The method of claim 15,

[Claim 17]

The method of claim 15,

And the resource element group is indexed in a time-first manner.

[Claim 18]

The method of claim 15, wherein.

And the resource element for the channel state indicator reference signal includes a resource element for a channel state indicator reference signal with an allocated transmit power of zero.