WO2014098407A1

WO2014098407A1 - Device and method for setting or transmitting resource element in multiple antenna system

Info

Publication number: WO2014098407A1
Application number: PCT/KR2013/011477
Authority: WO
Inventors: 리지안준; 박경민
Original assignee: 주식회사 팬택
Priority date: 2012-12-17
Filing date: 2013-12-11
Publication date: 2014-06-26
Also published as: KR20140078236A

Abstract

A device and method for setting a resource element in a multiple antenna system are disclosed. The present invention includes: receiving, from a base station, radio resource control signaling (RRC) for setting up a terminal-specific interference measurement resource element (IMR); and muting a portion of a physical downlink shared channel (PDSCH), to which the terminal-specific IMR is allocated, based on the terminal-specific IMR, to measure interference with another terminal.

Description

Device or method for setting or transmitting resource element in multi-antenna system

The present invention relates to wireless communications, and more particularly, to an apparatus and method for setting or transmitting resource elements in a multi-antenna system.

The existing mobile communication system can support eight transmit antennas for beamforming operation. In particular, in a multi-user multiple input multiple output (MIMO) operation, the same physical resource block (PRB) may be scheduled or allocated to up to four user equipments (UEs). have. In relation to the configuration of the antenna in this next generation mobile communication system, for example, a closely-spaced Xpolarized antenna, such as 0.5 to 0.7λ, may be considered.

Meanwhile, the next generation mobile communication system aims to support up to 64 transmit antennas in a two-dimensional antenna configuration with respect to a closed loop (CL) MIMO operation, and supports up to 8 terminals. .

As more terminals are supported, a method of controlling interference caused by another terminal to one terminal is required.

An object of the present invention is to provide a method and apparatus for configuring a resource element of a downlink physical channel to control interference.

Another object of the present invention is to provide a method and apparatus for transmitting a resource element of a downlink physical channel configured to control interference.

Another technical problem of the present invention is to improve the performance of the receiver.

According to an aspect of the present invention, a method for configuring a resource element by a terminal in a multi-antenna system includes receiving a radio resource control (RRC) signaling from a base station for configuring a terminal specific interference measurement resource element (IMR) and the terminal specification Muting a portion to which a UE-specific IMR is allocated in the physical downlink shared channel (PDSCH) based on the IMR, and measuring interference from another UE. In this case, the RRC signaling may be configured such that the UE-specific IMR is located in the PDSCH, or the UE-specific IMR is configured to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). May contain information.

According to another aspect of the present invention, a method of configuring a resource element by a base station in a multi-antenna system includes transmitting a Radio Resource Control (RRC) signaling for setting a UE-specific Interference Measurement Resource element (IMR) to the UE. In this case, the RRC signaling is configured to configure the UE-specific IMR to be located in the PDSCH or to configure the UE-specific IMR to be present in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). May contain information.

According to another aspect of the present invention, a terminal for configuring a resource element in a multi-antenna system, a receiver for receiving a Radio Resource Control (RRC) signaling from the base station for setting a terminal-specific Interference Measurement Resource element (IMR) and the terminal-specific IMR And an interference measuring unit configured to mute a portion to which a UE-specific IMR is allocated in a physical downlink shared channel (PDSCH) to measure interference from another UE. The receiver includes UE-specific IMR configuration information for configuring the UE-specific IMR to be located in the PDSCH or for configuring the UE-specific IMR to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). The RRC signaling may be received.

According to another aspect of the present invention, a base station for configuring a resource element in a multi-antenna system includes a transmitter for transmitting to the terminal Radio Resource Control (RRC) signaling for setting a terminal-specific Interference Measurement Resource element (IMR). In this case, the RRC signaling is configured to configure the UE-specific IMR to be located in the PDSCH or to configure the UE-specific IMR to be present in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). May contain information.

According to the present invention, in a multi-user multi-input multi-output system, interference from another user can be estimated or measured, and channel state information can be calculated or fed back based on this. Based on this feedback, the base station can schedule appropriate cooperative communications.

1 shows a wireless communication system to which the present invention is applied.

2 and 3 illustrate a CSI-RS pattern according to an example of the present invention.

4 illustrates a multiple antenna system according to an example of the present invention.

5 is a flowchart illustrating a method of transmitting a DMRS to which the present invention is applied.

6 is a flowchart illustrating an example of a method for setting a resource element according to the present invention.

7 illustrates an example of an IMR resource configuration indicator configured for UE measurement IMR configuration according to the present invention.

8 shows another example of an IMR resource configuration indicator for UE measurement IMR configuration according to the present invention.

9 illustrates an example in which a terminal measures interference (eg, MU-MIMO interference) by another terminal according to the present invention.

10 is a flowchart illustrating an example of an operation of a terminal for setting a resource element according to the present invention.

11 is a flowchart illustrating an example of an operation of a base station for setting a resource element according to the present invention.

12 is a block diagram illustrating a terminal and a base station for setting a resource element according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present specification, when it is determined that the detailed description of the related well-known configuration or function may obscure the subject matter of the present specification, the detailed description thereof will be omitted.

In the following description, the term 'transmitting a channel' may be interpreted as meaning that information is transmitted through a specific channel. Here, the channel is a concept including both a control channel and a data channel, and the control channel may be, for example, a physical downlink control channel (PDCCH) or a physical uplink control channel (PUCCH). The data channel may be, for example, a Physical Downlink Shared CHannel (PDSCH) or a Physical Uplink Shared CHannel (PUSCH).

Referring to FIG. 1, the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data. The wireless communication system 10 includes at least one base station 11 (evolved-NodeB, eNB). Each base station 11 provides a communication service for

specific cells

15a, 15b, and 15c. One base station may be responsible for multiple cells. In the present invention, the base station 11 refers to a transceiver for performing information and control information sharing with the terminal for cellular communication, and includes a base station (BS), a base transceiver system (BTS), an access point (Access Point), Other terms, such as a femto base station, a home node B, a relay, and the like, may be called. A cell is meant to encompass all of the various coverage areas such as megacell, macrocell, microcell, picocell, femtocell, and the like.

The UE 12 may be fixed or mobile and may have a mobile station (MS), a mobile terminal (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, or a PDA. It may be called a personal digital assistant, a wireless modem, a handheld device, or other terminology such as a terminal device or a wireless device.

Hereinafter, downlink refers to a transmission link from the base station 11 to the terminal 12, and uplink refers to a transmission link from the terminal 12 to the base station 11. it means. In downlink, the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12. In uplink, the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11. There is no limitation on the multiple access scheme applied to the wireless communication system. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiplexing Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA For example, various multiple access schemes such as OFDM-CDMA may be used. The uplink transmission and the downlink transmission may use a time division duplex (TDD) scheme that is transmitted using different times, or may use a frequency division duplex (FDD) scheme that is transmitted using different frequencies.

Layers of a radio interface protocol between the terminal 12 and the base station 11 are based on the lower three layers of the Open System Interconnection (OSI) model, which is well known in communication systems. The layer L1 may be divided into a second layer L2 and a third layer L3. Among them, the physical layer belonging to the first layer provides an information transfer service using a physical channel.

There are several physical channels used in the physical layer. A physical downlink control channel (PDCCH) is a resource allocation and transmission format of a downlink shared channel (DL-SCH), a resource of an uplink shared channel (UL-SCH). Resource allocation of upper layer control messages, such as allocation information, random access responses transmitted on a physical downlink shared channel (PDSCH), and transmission power control for individual terminals in any terminal group : TPC) can carry a set of commands. A plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs.

Control information of the physical layer mapped to the PDCCH is referred to as downlink control information (DCI). That is, DCI is transmitted through the PDCCH. The DCI may include an uplink or downlink resource allocation field, an uplink transmission power control command field, a control field for paging, a control field for indicating a random access response (RA response), and the like.

DCI has different uses according to its format, and fields defined in DCI are also different. Table 1 shows an example of the DCI format, and one or more of the following DCI formats may be used, but not all formats should be used.

Table 1

DCI format	Explanation
0	Used for scheduling of PUSCH (or uplink grant)
One	Used for scheduling one PDSCH codeword in one cell
1A	Used for simple scheduling of one PDSCH codeword in one cell and a random access procedure initiated by a PDCCH command
1B	Used for simple scheduling of one PDSCH codeword in one cell using precoding information
1C	Used for brief scheduling of one PDSCH codeword and notification of MCCH change
1D	Used for simple scheduling of one PDSCH codeword in one cell containing precoding and power offset information
2	Used for PDSCH scheduling for UE configured in spatial multiplexing mode
2A	Used for PDSCH scheduling of UE configured in long delay CDD mode
2B	Used in transfer mode 8 (double layer transfer)
2C	Used in transfer mode 9 (multi-layer transfer)
2D	Used to transmit TPC commands for PUCCH and PUSCH with power adjustment of 2 bits
3A	Used to transmit TPC commands for PUCCH and PUSCH with single bit power adjustment
4	Used for scheduling of PUSCH (Uplink Grant). In particular, it is used for PUSCH scheduling for a terminal configured in a spatial multiplexing mode.

Referring to Table 1, DCI format 0 is uplink scheduling information, format 1 for scheduling one PDSCH codeword, format 1A for compact scheduling of one PDSCH codeword, and very simple of DL-SCH. Format 1C for scheduling, format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, and uplink channel Formats 3 and 3A for transmission of a transmission power control (TPC) command.

Each field of the DCI is sequentially mapped to _n information bits a ₀ to a _n-1 . For example, suppose DCI is mapped to information bits having a total length of 44 bits, each DCI field is sequentially mapped to a ₀ to a ₄₃ . For example, DCI formats 0, 1A, 3, and 3A may all have the same payload size. DCI format 0 may be called an uplink grant.

The wireless communication system 10 may be a multiple antenna system. Multiple antenna systems may be referred to as multiple-input multiple-output (MIMO) systems. Alternatively, the multiple antenna system may be a multiple input single output (MISO) system, a single input single output (SISO) system, or a single input multiple output (SIMO) system. The MIMO system uses multiple transmit antennas and multiple receive antennas. The MISO system uses multiple transmit antennas and one receive antenna. The SISO system uses one transmit antenna and one receive antenna. The SIMO system uses one transmit antenna and multiple receive antennas.

Multiple antenna transmit / receive schemes used for the operation of multiple antenna systems include frequency switched transmit diversity (FST), Space Frequency Block Code (SFBC), Space Time Block Code (STBC), and Cyclic Delay Diversity (CDD). TSTD (time switched transmit diversity) may be used.

The wireless communication system 10 needs to estimate an uplink channel or a downlink channel for data transmission / reception, system synchronization acquisition, channel information feedback, and the like. The process of restoring a transmission signal by compensating for distortion of a signal caused by a sudden change in channel environment is called channel estimation. In addition, it is also necessary to measure the channel state (channel state) for the cell to which the terminal 12 belongs or other cells. In general, a reference signal (RS) that the terminal 12 and the base station 11 know from each other may be used for channel estimation or channel state measurement.

The terminal 12 knowing the information of the reference signal can accurately obtain the data sent from the base station 11 by estimating the channel and compensating the channel value based on the received reference signal. If the reference signal transmitted from the base station 11 is p, the channel information experienced by the reference signal during transmission is h, the thermal noise generated from the terminal 12 is n, and the signal received from the terminal 12 is y. = h * p + n ". In this case, since the reference signal p is already known to the terminal 12, when the LS (Least Square) method is used, channel information (

) Can be estimated.

Equation 1

Here, the channel estimate estimated using the reference signal p '

'Is'

'Because it depends on the value,

'We need to converge the value to zero. By using a large number of reference signals,

The channel can be estimated by minimizing the effect of '.

The reference signal may be allocated to all subcarriers, or may be allocated between data subcarriers for transmitting data. In a method in which the reference signals are allocated to all subcarriers, a signal having a specific transmission timing is composed of only a reference signal such as a preamble in order to obtain a gain of channel estimation performance. According to a method in which reference signals are allocated between data subcarriers, the amount of data transmission can be increased. In a multi-antenna system, resource elements used by one antenna to transmit a reference signal are not used by another antenna. This is to avoid interference between antennas.

The downlink reference signal includes a channel state information (CSI) reference signal (CSI-RS) and a demodulation RS (DMRS). Transmission patterns and configuration information are different for each reference signal.

<1. CSI-RS>

CSI-RS may be used for estimation of channel state information (CSI). The CSI-RS is placed in the frequency domain or time domain. Channel quality indicator (CQI), precoding matrix indicator (PMI) and rank indicator (RI) rank information such as channel quality indicator (CQI), if necessary through the estimation of the channel state using the CSI-RS As reported from the terminal.

The wireless communication system 10 may operate in accordance with various transmission modes. For example, transmission mode 0 may be a mode supporting only a single antenna port, and transmission mode 9 may be a mode capable of supporting up to 8 antenna ports. Here, when the first symbol (or signal) is carried over the first channel and the second symbol (or signal) is carried over the second channel, the first channel can be inferred by the second channel. An antenna port is defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed).

There is one resource grid unique to one antenna port. Each element in the resource grid for antenna port p is called a resource element (RE), and each resource element is identified by an index pair (k, l) in every slot (where k = 0, ..., N ^DL _RB * N ^RB _sc -1, l = 0, ..., N ^DL _symb -1, 'k' is the subcarrier index in the frequency domain, and 'l' is the Symbol index in the time domain). The resource element represents the smallest frequency-time unit to which the modulation symbol of the data channel or the modulation symbol of the control channel is mapped. If there are M subcarriers on one OFDM symbol, and one slot includes N OFDM symbols, one slot includes a total of 'M * N' resource elements.

In the multi-antenna system, different antenna ports may be mapped to each physical antenna. For example, antenna ports 0 to 3 may be sequentially mapped to each of the four physical antennas.

The number of antenna ports and the unique resource grid of each antenna port are determined depending on the reference signal configuration in the cell. For example, when the total number of physical antennas is 64, the number of antenna ports supporting CSI-RS is {1, 2, 4, 8 according to the configuration of the CSI-RS and the arrangement of the CSI-RS ports in the physical antenna. , 16, 32, 64}, and each antenna port may have a unique pattern for carrying a CSI-RS as shown in FIG. 2 or 3. Hereinafter, a unique pattern in which an antenna port carries a CSI-RS or a pattern in which a CSI-RS is mapped to a resource element is referred to as a 'CSI-RS pattern'.

2 and 3 illustrate a CSI-RS pattern according to an example of the present invention. 2 illustrates an example in which a CSI-RS is mapped to a resource element in the case of a normal cyclic prefix, and FIG. 3 illustrates an example in which a CSI-RS is mapped to a resource element in the case of an extended CP. It is shown schematically.

2 and 3, R _p represents a resource element used for CSI-RS transmission at the antenna port P. For example, R ₁₅ means CSI-RS transmitted from antenna port 15. For example, when one antenna port is supported in FIG. 2, the CSI-RS pattern is one in which CSI-RSs are mapped to resource elements (2, 5) and (2, 6) of antenna port 15. Alternatively, in FIG. 2, when eight antenna ports are supported, the CSI-RS pattern is mapped to resource elements (2, 5) and (2, 6) of antenna ports 15 and 16, and that antenna ports 17 and Mapped to resource elements (8, 5) and (8, 6) of 18, mapped to resource elements (3, 5) and (3, 6) of antenna ports 19 and 20, and resource elements of antenna ports 21 and 22 Maps to (9, 5) and (9, 6).

As such, each antenna port may have a unique CSI-RS pattern. 2 and 3 illustrate a total of eight antenna ports 15 to 22 transmitting CSI-RS in a wireless communication system equipped with eight physical antennas. However, this is only an example, and in the case of a wireless communication system having 64 physical antennas, up to 64 antenna ports may be supported, and in this case, antenna ports transmitting CSI-RS may be extended to antenna ports 15 to 63.

Referring to FIG. 4, the multi-antenna system includes a base station 410 having a plurality of antennas and a terminal 420 having a plurality of antennas. The base station 410 supports a total of 64 antennas as a two-dimensional antenna array having eight or more antenna ports. For example, the number of eight or more antenna ports supported by the base station 410 may be a corresponding number of any one of {16, 32, 64}. That is, the base station 410 may support an antenna port corresponding to a multiple of eight. Here, when the base station 410 supports the multi-user MIMO (MU-MIMO) operation, the base station 410 may support 10 terminals.

<2. DMRS>

Network systems can design DMRS that supports multiple layers. Up to eight layers may be supported for a single user MIMO of a terminal for DMRS transmission, and up to four layers may be supported for a multi-user MIMO. In a wireless communication system supporting up to 64 physical antennas, up to eight layers may be supported for multi-user MIMO.

Reference signals are generally transmitted in sequence. As the reference signal sequence, any sequence may be used without particular limitation. The reference signal sequence may use a PSK-based computer generated sequence. Examples of PSKs include binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK). Alternatively, the reference signal sequence may use a constant amplitude zero auto-correlation (CAZAC) sequence. Examples of CAZAC sequences include a ZCoff-Chu based sequence, a ZC sequence with cyclic extension, a ZC sequence with truncation, and the like. Alternatively, the reference signal sequence may use a pseudo-random (PN) sequence. Examples of PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences. In addition, the reference signal sequence may use a cyclically shifted sequence.

The parameter used for generating the DMRS sequence includes an antenna port number and a scrambling identity nCSID. In addition, the present embodiment may additionally include information on the number of resource elements. These parameters may be referred to as information used to impart orthogonality to the DMRS sequence.

Parameters used for generation of a DMRS sequence are included in the DCI and transmitted. For example, the information fields included in the DCI may be at least one of the fields of the following table.

TABLE 2

field	beat
Carrier indicator	0 to 3 bits
HARQ process number	3 bits for FDD, 4 bits for TDD
TPC command for PUCCH	2 bit
Downlink assignment index	2 bit
Modulation and coding scheme (for each transport block)	5 bit
New data indicator (for each transport block)	1 bit
Redundancy version (for each transport block)	2 bit
(Resource Block Allocation) Local Resource Allocation	beat
(Resource Block Allocation) Distributed Resource Allocation	Bit or beat
Sequence generation value	4 bit
Downlink assignment index (DAI)

Referring to Table 2, the DCI may include a carrier indicator field, a HARQ process number field, a transmission power control command field, a resource block allocation field, a downlink allocation index field, and particularly, a 4-bit sequence generation value field. do. The information fields included in Table 2 are exemplary, and the technical idea of the present invention includes not only a DCI in which at least one information field is omitted, but also a DCI in which a new information field is added in addition to the information fields. .

In Table 2, the sequence generation value indicates a combination of an antenna port number, a scrambling identifier, a number of layers, and a number of resource elements. have. The number of resource elements indicates the number of resource elements used to transmit the DMRS. If the sequence generation value is 4 bits, it can represent a total of 16 cases.

For single user-MIMO (SU-MIMO), the maximum number of layers for DMRS is 8, up to two layers for multi-user MIMO (MU-MIMO mode), and up to 4 An example of supporting the number of layers is described.

Referring to FIG. 5, the base station determines a sequence generation value (S500).

The base station generates a DCI including the determined sequence generation value (S505). The sequence generation value indicates a combination of the antenna port number, the scrambling identifier, the number of layers, and the number of resource elements. For example, the sequence generation value may be 4-bit information. In addition, the DCI including the sequence generation value may be defined as shown in Table 2 above. However, the information fields included in Table 2 are exemplary, and the technical idea of the present invention is not only DCI in which at least one information field is omitted, but also DCI in which a new information field is added in addition to the information fields. Include. The number of resource elements indicates the number of resource elements used to transmit the DMRS. Since the sequence generation value is 4 bits, it can represent a total of 16 cases.

The base station maps the DCI including the determined sequence generation value to the PDCCH and transmits it to the terminal (S510). In order to receive the DCI from the base station, the terminal monitors the PDCCH to which the DCI is mapped. When the terminal successfully decodes the PDCCH, the terminal acquires the DCI. The information field in the DCI is analyzed to identify at least one of the number of layers indicated by the sequence generation value, the antenna port number, the scrambling identifier, and the number of resource elements.

The base station transmits the DMRS to the terminal using the DMRS sequence determined based on the sequence generation value (S515). The terminal checks the DMRS sequence using at least one of the number of layers indicated by the sequence generation value, the antenna port number, the scrambling identifier, and the number of resource elements, and receives the DMRS from the base station by using the same. DMRS may be transmitted through a data channel (eg, PDSCH).

Now, an apparatus and method for setting or transmitting a resource element in a multi-antenna system according to the present invention will be described. Hereinafter, according to the present invention, a method of setting a UE specific IMR (UE specific Interference Measurement Resource element) and transmitting and receiving the IMR configuration information is proposed. The UE-specific IMR refers to a resource element in which one terminal measures an interference signal received by another terminal in a MU-MIMO system. In this case, one terminal may adjust the interference by removing the interference signal received by the other terminal from the entire received signal. That is, MU-MIMO performance at the receiving end of the terminal can be improved by using the terminal specific IMR.

Referring to FIG. 6, the base station transmits information (or 'terminal specific IMR configuration information') for configuring the terminal specific IMR to the terminal (S600). IMR setting information is also called IMR configuration information.

For example, the UE-specific IMR configuration information may be received through RRC signaling. The base station may configure the UE specific IMR through RRC signaling.

The UE-specific IMR may be configured to be located in a PDSCH region, and a subframe or subband for the UE-specific IMR should not be separately configured.

In addition, the UE-specific IMR may be present in an OFDM symbol including a DMRS (in particular, may be included in two OFDM symbols including a DMRS). Specifically, a physical resource block (PRB) may consist of 12 subcarriers and 6 or 7 OFDM symbols, and the PRB may include an 'OFDM symbol including DMRS'. UE specific IMR may exist in two OFDM symbols including DMRS.

In this case, all of the OFDM symbols including the DMRS may be configured as a UE-specific IMR, or only a part may be configured as a UE-specific IMR. When only a part of the OFDM symbol including the DMRS is configured by the UE-specific IMR, the remaining part may further include a DMRS or CSI-RS.

On the other hand, by setting the UE-specific IMR in two RE units in the Physical Resource Block (PRB), it is possible to avoid allocating REs more than necessary and to prevent overhead. Of course, the scope of the present invention is not limited to two REs, and the UE-specific IMR may be composed of two or more REs.

Meanwhile, the pattern of the terminal specific IMR may be configured to be similar to the pattern of DMRS. In this case, if the UE-specific IMR is configured by the base station, DMRS may be covered through the UE-specific IMR. Alternatively, information to be transmitted through DMRS may also be transmitted in a PDSCH region in which UE-specific IMR is transmitted. Resources allocated to the PDSCH region may be configured by RRC signaling.

As another example, the UE-specific IMR configuration information may include an IMR resource configuration indicator (also referred to as an IMR resource configuration indicator or an IMR pattern indicator), an OCC indicator, an N ^DMRS _ID, or an n _SCID . Here, N ^DMRS _ID and n _SCID are values for determining UE-specific DMRS scrambling initial state, and more specifically, N ^DMRS _ID is a virtual cell ID for DMRS scrambling initial state.

The following table shows an example of UE-specific IMR configuration information.

TABLE 3

Information field	Explanation
IMRResourceConfig	IMR pattern, 12 or 8 bits

Referring to Table 3, the UE-specific IMR configuration information may include only the IMR resource configuration indicator. For example, when the UE-specific IMR is not in the DMRS region or when it is not necessary to transmit DMRS-related information, the UE-specific IMR configuration information may include only the IMR resource configuration indicator.

Here, 'IMRResourceConfig' is an IMR resource configuration indicator and indicates an IMR pattern. For example, the IMR resource configuration indicator indicates whether each subcarrier includes a terminal specific IMR.

Each bit of the IMR resource configuration indicator may correspond to a subcarrier. For example, the IMR resource configuration indicator may be 12 bits, and the LSB may correspond to the smallest subcarrier index and the MSB may correspond to the largest subcarrier index. The IMR resource configuration indicator indicates whether each subcarrier includes a terminal specific IMR. As another example, the size of the IMR resource configuration indicator may be 8 bits, and each bit may correspond to an index of some subcarriers (eg, subcarriers not including CSI-RS) among 12 subcarriers of the PRB.

The following table shows another example of UE-specific IMR configuration information.

Table 4

Information field	Explanation
IMRResourceConfig	Indicates IMR pattern, 12 bit or 8 bit
OCC Indicator	Indicates OCC cover for interferometry, 1 bit or 2 bits or 3 bits
N ^DMRS _ID	DMRS scrambling initial state Virtual Cell ID (DMRS scrambling initial state Virtual Cell ID) The virtual cell ID is a cell ID of the terminal that is likely to be paired (pairing) in the MU-MIMO mode operation.
n _SCID	N _SCID for DMRS scrambling initial state

Referring to Table 4, the UE-specific IMR configuration information may include an IMR resource configuration indicator, an OCC indicator, N ^DMRS _ID and n _SCID . When the UE-specific IMR is in the DMRS region or when it is necessary to transmit DMRS-related information, the UE-specific IMR configuration information may include an IMR resource configuration indicator, an OCC indicator, an N ^DMRS _ID, and an n _SCID . Here, the case in which the UE-specific IMR configuration information has a DMRS region means that a UE-specific IMR is set in a region allocated to transmit the DMRS. This is also referred to as UE-specific IMR is allocated to the DMRS region. Alternatively, the UE-specific IMR may also share the DMRS.

Here, the OCC indicator, N ^DMRS _ID and n _SCID are information transmitted to the terminal to allow the terminal to measure MU-MIMO interference based on the DMRS of another terminal. The OCC indicator is an indicator indicating an OCC cover for interference measurement, N ^DMRS _ID is a virtual cell ID for DMRS scrambling initial state, and n _SCID is a terminal specific DMRS scrambling initial state. The value to determine.

For example, the OCC indicator, the N ^DMRS _ID, and the n _SCID may be the same format as that used in the existing DMRS. That is, the terminal specific IMR may be in a format further including an IMR resource configuration indicator in the DMRS. The N ^DMRS _ID is two virtual cell ID values for the terminal to be paired and is ^transmitted to the base station through the N ^DMRS _ID field.

Meanwhile, the OCC cover of the DMRS indicated by the OCC indicator may be of two types. An OCC cover of length 2 and an OCC cover of length 4. Accordingly, at least three types of OCC indicators are possible.

Table 5 shows an example of a 1-bit OCC indicator, that is, an OCC cover having a length of 2.

Table 5

OCC indicator
0	[+1 +1]
One	[-1 +1]

Table 6 shows an example of a 2-bit OCC indicator, that is, an OCC cover having a length of four.

Table 6

OCC indicator
00	[+1 +1 +1 +1]
01	[+1 -1 +1 -1]
10	[+1 +1 -1 -1]
11	[+1 -1 -1 +1]

Table 7 shows an example of a 3-bit OCC indicator, that is, an indicator indicating both an OCC cover of length 2 and an OCC cover of length 4.

TABLE 7

OCC indicator	OCC
000	No OCC
001	[+1 +1]
010	[-1 +1]
011	[+1 +1 +1 +1]
100	[+1 -1 +1 -1]
101	[+1 +1 -1 -1]
110	[+1 -1 -1 +1]
111	Reserved

Meanwhile, the N ^DMRS _ID is a virtual cell ID for the UE-specific DMRS scrambling initial state, and the length of the N ^DMRS _ID may be one of '0' to '503', and the unit may be a bit.

In addition, n _SCID is a value for determining the UE-specific DMRS scrambling initial state, and has a value of '0' or '1'.

Based on the n _SCID and the N ^DMRS _ID , the UE-specific DMRS scrambling initial state may be determined as follows.

Equation 2

In this case, 'C _init' may be an initial value of a pseudo-random sequence.

On the other hand, after step S600, if the UE-specific IMR is allocated to the DMRS region through RRC signaling, the UE measures (or estimates) interference of another UE through the UE-specific IMR ( S605).

A process of measuring interference from another terminal by another terminal will be described in detail.

According to the UE-specific IMR set by the base station, the portion to which the UE-specific IMR is allocated in the PDSCH received by the UE is muted (or the data of the PDSCH is removed from the corresponding region, or the data of the PDSCH is removed from the corresponding region). Ignored, or PDCSH is punctured in that region). Since the data to be transmitted to the terminal by the base station is muted in the terminal specific IMR of the PDSCH, the terminal specific IMR includes only other interference signals such as data or noise transmitted to other terminals.

Accordingly, the terminal may measure an interference signal (or a value including various noises) of another terminal by measuring a signal included in the terminal specific IMR. For example, a terminal of the MU-MIMO system may measure interference of another terminal based on the terminal specific IMR.

As such, interference information obtained from another UE through UE-specific IMR may be applied to an advanced minimum-mean-square error (MMSE) receiver (eg, an MMSE IRC (interference rejection combination receiver). It can be used to improve the performance of detecting signal or data signals.

Meanwhile, PRB bundling may be applied to the UE-specific IMR.

7 illustrates an example of an IMR resource configuration indicator configured for UE measurement IMR configuration according to the present invention. The size of the IMR resource configuration indicator is 12 bits.

Referring to FIG. 7, the MSB 720 of the IMR resource configuration indicator corresponds to the smallest subcarrier index, and the LSB 710 corresponds to the largest subcarrier index. As another example, the LSB of the IMR resource configuration indicator may correspond to the smallest subcarrier index, and the MSB may correspond to the largest subcarrier index.

In this case, a bit having a value of '1' among each bit of the IMR resource configuration indicator may indicate that a corresponding subcarrier includes a terminal measurement IMR. As another example, a bit having a value of '0' among each bit of the IMR resource configuration indicator may indicate that a corresponding subcarrier includes UE measurement IMR.

8 shows another example of an IMR resource configuration indicator for UE measurement IMR configuration according to the present invention. This is the case where the size of the IMR resource configuration is 8 bits.

Referring to FIG. 8, the PRB may include subcarriers (eg, four) including REs that are likely to be occupied with the CSI-RS. UE-specific IMRs may be included in the remaining subcarriers (eg, eight) except for subcarriers that may be allocated for CSI-RS. Accordingly, the 8-bit IMR resource configuration indicator may indicate whether the subcarrier to which the CSI-RS is not allocated includes the UE-specific IMR. That is, a bit having a value of '1' among each bit of the IMR resource configuration indicator indicates that the corresponding subcarrier includes a terminal measurement IMR.

9 illustrates an example in which a terminal measures interference (eg, MU-MIMO interference) by another terminal according to the present invention. Hereinafter, a terminal measuring interference will be described as 'UE _i ' having an index 'i'.

Referring to FIG. 9, a UE estimates a channel H through a region where a DMRS is allocated in a PRB (910, 920, 940), and measures interference R _I through a region where a UE-specific IMR is allocated. Or estimate 930.

UE (UE _i ) is based on the DMRS '

'Can be estimated. If you have a precoding matrix of size 'Nt * R _i '

Where 'H' is a channel matrix of size 'Nr * Nt', and 'C _i ' is 'Nt * R _i ' for the UE UE _i calculated by the base station. It is a precoding matrix of magnitude. Here, Nr means the number of antennas on the receiving side, Nt means the number of antennas on the transmitting side, and Ri means the number of all layers of the terminal.

The signal Y received by the UE UE _i may be expressed as in the following equation.

Equation 3

Where, where

'(j = 1, ..., N and j ≠ i) is a channel for another UE UE _j . 'I' is the sum of noise and inter-cell interference with respect to the UE UE _i . X _i is a data symbol of the terminal UE _i , X _j is a data symbol of the other terminal UE _j .

The terminal UE _i is a data symbol of the received signal Y by a linear receiver.

) Can be obtained. The following equation shows an example of a method of obtaining data symbols.

Equation 4

Here, W _i is the detection weight of the UE (UE _i ).

Of the terminal sensed weight (W _i) is described by dividing the terminal is within the specific case of the new IMR RE (for example, if it is not within the area DMRS) and the UE-specific IMR the DMRS region.

<1. If the UE-specific IMR is a new RE>

When the UE-specific IMR is a new type of RE (eg, when it is not in the DMRS region or by UE-specific IMR configuration information as shown in Table 3), the UE UE _i indicates that the PDSCH is determined for the region in which the UE-specific IMR is included. It is muted (or the data of the PDSCH is removed in the area, or the data of the PDSCH is ignored in the area, or the PDCSH is punctured in the area).

In this case, the received signal Y _IMR in the UE-specific IMR region may be expressed by the following equation.

Equation 5

Here, the correlation property of the sum 'I' of the noise and the inter-cell interference may be measured (or estimated) by a cell-specific reference signal RE (CRS RE), also referred to as R _I.

Thus, by using R _I to remove (or cancel, or take into account) the effect of I, the UE UE _i is not subject to interference from other terminals (

Can be measured (or estimated).

In the MU-MIMO system, the UE may obtain a statistical property of interference (R _MU-MIMO ) by combining the CRS RE and the UE-specific IMR The following equation is an example of the R _MU-MIMO . Indicates.

Equation 6

R _MU-MIMO and Using (or controlling, or adjusting) the 'sensing weights W _i ' with R _I , the MMSE IRC receiver can increase performance (eg, PDSCH sensing performance). For example, MMSE performance may be improved by suppressing intercell interference and MU-MIMO interference. The following shows an example of a mathematical expression detecting weights (W _i).

Equation 7

<2. UE specific IMR is in DMRS area>

If the UE-specific IMR is in the DMRS region, the 'OCC indicator', 'N ^DMRS _ID ' and 'n _SCID ' parameters included in the UE-specific IMR configuration information (or transmitted through RRC signaling) are valid (eg, UE specific IMR covers DMRS), and may indicate one antenna port DMRS or a sum of two antenna port DMRS.

In this case, when the OCC indicator, the N ^DMRS _ID, and the n _SCID indicate the sum of two antenna port DMRSs, the OCC length of the DMRS of another UE is 4 and the OCC length indicated by the OCC indicator is 2.

As such, when the UE knows that the DMRS indicated by the parameters (OCC indicator, N ^DMRS _ID, and n _SCID ) is not the UE's own DMRS, the UE uses other terminals by using the DMRS indicated by the parameters. Interference from can be measured (or estimated).

In this case, when the UE-specific IMR is in the DMRS region, interference of two UEs may be suppressed in MU-MIMO. However, since there is no need to additionally allocate an RE for UE-specific IMR, there is an advantage of less overhead.

For example, if the DMRS port of the UE UE _i is '7', the UE UE _i is precoded by the DMRS antenna port 7.

) Can be estimated. When the UE-specific IMR indicates antenna port 8, UE UE _i is precoded by another DMRS antenna port 8 to a precoded channel (UE) of UE _j .

) Can be estimated.

In this case, MU-MIMO interference (R _MU-MIMO ) can be obtained by the following equation.

Equation 8

R _MU-MIMO and R _I, with Detecting the weight (W _i) using the (or to control, or to control), MMSE IRC receiver can improve performance (for example, PDSCH detection performance). The following shows another example of a mathematical expression of the terminal UE _i sensing the weight (W _i).

Equation 9

That is, using the detected weights (W _i) terminal precoded channel "

'May remove (or control, or adjust, or suppress) interference of UE UE _i with respect to'.

Referring to FIG. 10, the terminal receives an RRC signaling for configuring terminal specific IMR from the base station (S1000). Alternatively, the RRC message (eg, RRC connection reconfiguration message, RRC connection reconfiguration message) transmitted from the base station to the terminal may include information for setting the terminal specific IMR (that is, the terminal specific IMR configuration information).

For example, the UE-specific IMR configuration information may be information for configuring the UE-specific IMR to be located in the PDSCH region.

As another example, the UE specific IMR configuration information may be information for configuring the UE specific IMR to exist in an OFDM symbol including DMRS.

As another example, the OFDM symbols including the DMRS may be configured in all of the UE-specific IMR or only part of the UE-specific IMR. When only a part of the OFDM symbol including the DMRS is configured by the UE-specific IMR, the remaining part may further include a DMRS or CSI-RS.

As another example, the pattern of the UE-specific IMR may be configured to be similar to the pattern of the DMRS. In this case, if the UE-specific IMR is configured by the base station, DMRS may be covered through the UE-specific IMR. Alternatively, information to be transmitted through DMRS may also be transmitted in a PDSCH region in which UE-specific IMR is transmitted. Resources allocated to the PDSCH region may be configured by RRC signaling.

As another example, the UE specific IMR configuration information may include an IMR resource configuration indicator as shown in Table 3 above. The IMR resource configuration indicator may be the indicator described with reference to FIGS. 7 to 8.

As another example, the UE-specific IMR configuration information may include an IMR resource configuration indicator, an OCC indicator, an N ^DMRS _ID, and an n _SCID as shown in Table 4 above. In this case, the OCC indicator may indicate an OCC cover having a length of 2 or an OCC cover having a length of 4, and may be one of Tables 5 to 7. In addition, n _SCID and N ^DMRS _ID may be a value for determining an UE-specific DMRS scrambling initial state as shown in Equation 2 above. The IMR resource configuration indicator may be the indicator described with reference to FIGS. 7 to 8.

After step S1000, the UE first detects the PDCCH in order to receive the PDSCH (S1005), and estimates the downlink channel based on the DMRS (estimate, S1010).

Subsequently, the terminal measures (or estimates) the interference (eg, MU-MIMO interference) based on the terminal specific IMR (S1015). For example, the terminal may measure interference in the same manner as in FIG. 9.

Based on the configured UE-specific IMR, the UE mutes the portion of the PDSCH to which the UE-specific IMR is allocated (or removes data of the PDSCH in the corresponding region, or ignores the data of the PDSCH in the corresponding region, or in the corresponding region). Puncture the PDCSH). Through this, the terminal may distinguish (or measure) other interference signals such as a signal or noise transmitted to another terminal.

For example, when the UE-specific IMR is a new RE (eg, not in the DMRS region), the UE calculates a received signal Y _IMR in the UE-specific IMR region by using the UE-specific IMR as shown in the above equation, Based on the Y _IMR , the CRS RE and the UE-specific IMR are combined to calculate a statistical characteristic of interference (R _MU-MIMO ) as shown in Equation 6, and as shown in Equation 7 based on R _MU-MIMO . The terminal weight _Wi may be calculated, and data may be obtained from the received signal using a linear receiver as shown in Equation 4 based on W _i .

As another example, if the UE-specific IMR in the DMRS area, the mobile station its own channel (H _i) to estimate and to estimate the channel (Hj) of the other terminals, as shown in the equation (8) on the basis of H _i and H _j Calculate the statistical characteristics (R _MU-MIMO ) of the interference, calculate the terminal weight (W _i ) as shown in Equation 9 based on the R _MU-MIMO , and linear receiver as shown in Equation 4 based on W _i Can be used to obtain data from the received signal.

The terminal detects the PDSCH through a receiver (eg, an MMSE IRC receiver) and receives data (S1020). The terminal may improve the performance by applying the interference information from the other terminal to the MMSE receiver.

Referring to FIG. 11, the base station configures a terminal specific IMR to the terminal using RRC signaling (S1100). For example, the RRC message (eg, RRC connection reconfiguration message, RRC connection reconfiguration message) transmitted from the base station to the terminal may include information for configuring the UE-specific IMR (ie, UE-specific IMR configuration information).

The base station schedules downlink MU-MIMO transmission (S1105).

The base station transmits the PDSCH or the DMRS to the terminal (S1110). For example, based on the configured UE-specific IMR, the base station mutes the portion of the PDSCH to which the UE-specific IMR is allocated (or removes the data of the PDSCH in the corresponding region, or ignores the data of the PDSCH in the corresponding region, Or puncture PDCSH in that region).

Referring to FIG. 12, the terminal 1200 includes a receiver 1205 or a controller 1210. The controller 1210 includes a detector 1215, a channel estimator 1220, or an interference measurer 1225.

The receiver 1205 receives an RRC signaling for configuring a UE-specific IMR from the base station 1250. Alternatively, the reception unit 1205 receives an RRC message (eg, an RRC connection reconfiguration message or an RRC connection reconfiguration message) including information for configuring terminal specific IMR (that is, terminal specific IMR configuration information).

As another example, the pattern of the UE-specific IMR may be configured to be similar to the pattern of the DMRS. At this time, if the UE-specific IMR is configured by the base station 1250, DMRS may be covered through the UE-specific IMR. Alternatively, information to be transmitted through DMRS may also be transmitted in a PDSCH region in which UE-specific IMR is transmitted. Resources allocated to the PDSCH region may be configured by RRC signaling.

The detector 1215 first detects the PDCCH in order to receive the PDSCH, and the channel estimator 1220 estimates the downlink channel based on the DMRS.

The interference measuring unit 1225 measures (or estimates) interference (eg, MU-MIMO interference) based on the terminal specific IMR. For example, the interference measuring unit 1225 may measure interference in the same manner as in FIG. 9.

Based on the configured UE-specific IMR, the interference measuring unit 1225 mutes the portion of the PDSCH to which the UE-specific IMR is allocated (or removes the data of the PDSCH in the corresponding area, or ignores the data of the PDSCH in the corresponding area). , Or puncture the PDCSH in that region). Through this, the interference measuring unit 1225 may distinguish (or measure) other interference signals such as a signal or noise transmitted to another terminal.

For example, when the UE-specific IMR is a new RE (eg, not in the DMRS region), the interference measuring unit 1225 uses the UE-specific IMR to receive the received signal (Y _IMR) in the UE-specific IMR region as shown in the above equation. ) And calculate the statistical property of interference (R _MU-MIMO ) by combining CRS RE and UE-specific IMR based on Y _IMR as shown in Equation 6 above, and based on R _MU-MIMO . As shown in Equation 7, the terminal weight W _i may be calculated, and data may be obtained from the received signal using a linear receiver as shown in Equation 4 based on W _i .

As another example, when the UE-specific IMR is in the DMRS region, the interference measuring unit 1225 estimates the channel H _i of the terminal 1200 and also estimates the channel H _j of the other terminal, thereby calculating H _i and H _j. Calculate the statistical characteristic of the interference (R _MU-MIMO ) as shown in Equation 8, calculate the terminal weight (W _i ) as shown in Equation 9 based on R _MU-MIMO, and based on W _i As shown in Equation 4, data can be obtained from a received signal using a linear receiver.

The receiver 1205 detects a PDSCH through a receiver (eg, an MMSE IRC receiver) and receives data. Through this, the terminal 1200 may improve the performance by applying the interference information from the other terminal to the MMSE receiver.

On the other hand, the transmitter 1255 and the control unit 1260 of the base station 1250. The controller 1260 may further include a scheduling unit 1265.

The transmitter 1255 transmits RRC signaling to configure the terminal specific IMR to the terminal 1200. For example, an RRC message (eg, an RRC connection reconfiguration message or an RRC connection reconfiguration message) transmitted by the transmitter 1255 to the terminal 1200 may include information (ie, terminal specific IMR configuration information) for configuring terminal specific IMR. It may include.

For example, the UE-specific IMR configuration information may be set such that the UE-specific IMR is located in a PDSCH region.

As another example, the UE-specific IMR configuration information may be set such that the UE-specific IMR is present in an OFDM symbol including DMRS.

The scheduling unit 1265 schedules downlink MU-MIMO transmission.

The transmitter 1255 transmits the PDSCH or the DMRS to the terminal 1200. For example, based on the configured UE-specific IMR, the transmitter 1255 mutes the portion of the PDSCH to which the UE-specific IMR is allocated (or removes data of the PDSCH in the corresponding region, or data of the PDSCH in the corresponding region). Ignore or puncture the PDCSH in that region).

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims

In the multi-antenna system in the resource element configuration method by the terminal,

Receiving, from a base station, Radio Resource Control (RRC) signaling for configuring a terminal-specific Interference Measurement Resource element (IMR); And

Muting a portion to which a terminal specific IMR is allocated in a physical downlink shared channel (PDSCH) based on the terminal specific IMR, and measuring interference from another terminal;

The RRC signaling sets UE-specific IMR configuration information for configuring the UE-specific IMR to be located in the PDSCH or for configuring the UE-specific IMR to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). Resource element setting method comprising the.
The method of claim 1,

The terminal specific IMR configuration information further includes an IMR resource configuration indicator indicating an IMR pattern for whether each subcarrier of a PRB (Physical Resource Block) includes a terminal specific IMR.
The method of claim 2,

The UE-specific IMR configuration information further includes an OCC indicator indicating an orthogonal cover code (OCC) cover having a length of 2 or an OCC cover having a length of 4.
The method of claim 3, wherein

The terminal specific configuration information further comprises information transmitted through the DMRS.
The method of claim 1,

The terminal specific IMR configuration information

A part of the OFDM symbol including the DMRS is set to the UE-specific IMR, and the remaining part of the OFDM symbol including the DMRS is configured to further include a DMRS or Channel State Information-RS (CSI-RS) How to set up resource elements.
The method of claim 1,

Estimating a downlink channel based on the DMRS;

And measuring an interference signal from the other terminal based on the downlink channel.
In the multi-antenna system, a method for setting a resource element by a base station,

Transmitting radio resource control (RRC) signaling for setting a terminal-specific interference measurement resource element (IRM) to the terminal;

The RRC signaling sets UE-specific IMR configuration information for configuring the UE-specific IMR to be located in the PDSCH or for configuring the UE-specific IMR to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). Resource element setting method comprising the.
The method of claim 7, wherein

Scheduling downlink transmission further;

And transmitting the PDSCH or the DMRS to the terminal based on the scheduling.
The method of claim 8,

The PDSCH is a method of configuring a resource element, characterized in that the muted portion is allocated to the terminal specific IMR is transmitted.
The method of claim 7, wherein

The terminal specific IMR configuration information further includes an IMR resource configuration indicator indicating an IMR pattern for whether each subcarrier of the PRB includes a terminal specific IMR.
The method of claim 7, wherein

The terminal specific IMR configuration information further comprises an OCC indicator indicating an OCC cover of length 2 or an OCC cover of length 4.
The method of claim 11,

The terminal specific configuration information further comprises information transmitted through the DMRS.
In a terminal for configuring a resource element in a multi-antenna system,

A receiver configured to receive RRC (Radio Resource Control) signaling for configuring a terminal specific Interference Measurement Resource element (IMR); And

And an interference measuring unit for muting a portion to which a terminal specific IMR is allocated in a physical downlink shared channel (PDSCH) based on the terminal specific IMR and measuring interference from another terminal,

The receiving unit,

The RRC including UE-specific IMR configuration information for configuring the UE-specific IMR to be located in the PDSCH or for configuring the UE-specific IMR to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS) Terminal for receiving the signaling.
The method of claim 13,

The receiving unit,

And receiving the terminal specific IMR configuration information further comprising an IMR resource configuration indicator indicating an IMR pattern relating to whether each subcarrier of a physical resource block (PRB) includes a terminal specific IMR.
The method of claim 14,

The receiving unit

And an OCC indicator indicating an OCC cover having a length of 2 or an OCC cover having a length of 4.
The method of claim 13,

A channel estimator for estimating a downlink channel based on the DMRS;

The interference measuring unit,

And measuring an interference signal from the other terminal based on the downlink channel.
In the base station for setting the resource element in a multi-antenna system,

It includes a transmitter for transmitting to the terminal Radio Resource Control (RRC) signaling for setting a terminal-specific Interference Measurement Resource element (IMR),

The RRC signaling sets UE-specific IMR configuration information for configuring the UE-specific IMR to be located in the PDSCH or for configuring the UE-specific IMR to exist in an Orthogonal Frequency Division Multiplexing (OFDM) symbol including a DeModulation Reference Signal (DMRS). A base station comprising a.
The method of claim 17,

The transmission unit,

And transmitting the PDSCH by muting the portion to which the UE-specific IMR is allocated.
The method of claim 17,

The transmission unit,

And a base station-specific IMR configuration information further comprising an IMR resource configuration indicator indicating an IMR pattern relating to whether each subcarrier of a PRB includes a terminal-specific IMR.
The method of claim 19,

The transmission unit,

And a terminal specific IMR configuration information further comprising an OCC indicator indicating an OCC cover having a length of 2 or an OCC cover having a length of 4.