KR20140078236A - Apparatus and method of configuring or transmitting resource element in multiple antenna system - Google Patents

Abstract

A method and apparatus for setting resource elements in a multi-antenna system are disclosed. In this specification, a radio resource control (RRC) signaling that sets up a UE-specific Interference Measurement Resource element (IMR) is received from a base station, and a portion of the Physical Downlink Shared Channel (PDSCH) And measuring the interference from the other terminal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates generally to a multi-antenna system,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wireless communication, and more particularly, to an apparatus and method for setting or transmitting resource elements in a multi-antenna system.

A conventional mobile communication system can support 8 transmit antennas for beamforming operation. Particularly, in a multi-user multiple input multiple output (MIMO) operation, the same physical resource block (PRB) can be scheduled or allocated to up to four user equipment (UE) have. With respect to the construction of the antenna in this next generation mobile communication system, a closely-spaced X-polarized antenna of, for example, 0.5 to 0.7? Can 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 the interference that another terminal applies to one terminal is required.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for setting resource elements of a downlink physical channel for controlling interference.

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

A further technical object of the present invention is to improve the performance of a receiver.

According to an aspect of the present invention, a method for establishing a resource element by a UE in a multi-antenna system includes receiving RRC (Radio Resource Control) signaling for setting a UE-specific IMR (Interference Measurement Resource element) And mobilizing a portion of the Physical Downlink Shared Channel (PDSCH) to which the UE-specific IMR is allocated, based on the IMR, and measuring interference from other UEs. The RRC signaling may be configured to set the UE-specific IMR to be located on the PDSCH or to set the UE-specific IMR to exist in an OFDM symbol including a DMRS (DeModulation Reference Signal) Information.

According to another aspect of the present invention, a method for establishing a resource element by a base station in a multi-antenna system includes transmitting RRC (Radio Resource Control) signaling for setting a UE-specific Interference Measurement Resource element (IMR) to a UE. The RRC signaling may be configured to set the UE-specific IMR to be located on the PDSCH or to set the UE-specific IMR to exist in an OFDM symbol including a DMRS (DeModulation Reference Signal) Information.

According to another aspect of the present invention, a terminal for establishing a resource element in a multi-antenna system includes a receiver for receiving RRC (Radio Resource Control) signaling for setting a UE-specific IMR (Interference Measurement Resource element) And an interference measurement unit for measuring interference from other terminals by muting a portion to which a UE-specific IMR is allocated in a PDSCH (Physical Downlink Shared Channel). The receiver may set the UE-specific IMR to be located on the PDSCH or include UE-specific IMR setting information for setting the UE-specific IMR to exist in an OFDM symbol including a DMRS (DeModulation Reference Signal) Lt; RTI ID = 0.0 > RRC < / RTI >

According to another aspect of the present invention, a base station for establishing a resource element in a multi-antenna system includes a transmitter for transmitting Radio Resource Control (RRC) signaling for setting a UE-specific Interference Measurement Resource element (IMR) to a UE. The RRC signaling may be configured to set the UE-specific IMR to be located on the PDSCH or to set the UE-specific IMR to exist in an OFDM symbol including a DMRS (DeModulation Reference Signal) Information.

According to the present invention, it is possible to estimate or measure interference from other users in a multi-user multi-input multiple output system, and calculate or feedback channel state information based on the interference. Based on this feedback, the base station can schedule the appropriate cooperative communication.

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 in accordance with 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 resource elements according to the present invention.
FIG. 7 shows an example of an IMR resource setting indicator for setting a terminal measurement IMR according to the present invention.
8 shows another example of an IMR resource setting indicator for setting a terminal measurement IMR according to the present invention.
9 shows an example in which the UE measures interference (e.g., MU-MIMO interference) by another UE according to the present invention.
10 is a flowchart showing an example of the operation of a terminal for setting resource elements according to the present invention.
11 is a flowchart showing an example of the operation of a base station that sets resource elements according to the present invention.
FIG. 12 is a block diagram illustrating a terminal and a base station for setting resource elements according to the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

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

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

Referring to FIG. 1, a wireless communication system 10 is widely deployed to provide various communication services such as voice, packet data, and the like. The wireless communication system 10 includes at least one base station 11 (evolved-NodeB, eNB). Each base station 11 provides communication services to specific cells (15a, 15b, 15c). One base station may be responsible for a plurality of cells. In the present invention, the base station 11 refers to a transmitting / receiving end for performing information sharing and control information sharing with a terminal for cellular communication and includes a base station (BS), a base transceiver system (BTS), an access point A femto base station, a home node B, a relay, and the like. Cells are meant to cover various coverage areas such as megacell, macrocell, microcell, picocell, and femtocell.

A user equipment (UE) 12 may be fixed or mobile and may be a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, (personal digital assistant), a wireless modem, a handheld device, or other term, such as a terminal device or a wireless device.

Hereinafter, the downlink refers to a transmission link from the base station 11 to the terminal 12, and the uplink refers to a transmission link from the terminal 12 to the base station 11 it means. In the downlink, the transmitter may be part of the base station 11, and the receiver may be part of the terminal 12. In the uplink, the transmitter may be part of the terminal 12, and the receiver may be part of the base station 11. There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiplexing Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

The layers of the 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 well known in the communication system, Layer L1, 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. The physical downlink control channel (PDCCH) includes 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 an upper layer control message such as allocation information, a random access response transmitted on a physical downlink shared channel (PDSCH), transmission power control for individual terminals in an arbitrary terminal group : TPC) commands, and so on. A plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs.

The control information of the physical layer mapped to the PDCCH is referred to as downlink control information (DCI). That is, the DCI is transmitted on 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.

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

DCI format (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 in a random access procedure initiated by a PDCCH command. 1B It is 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 changes 1D Used for simple scheduling of one PDSCH codeword in one cell, including precoding and power offset information. 2 Used for PDSCH scheduling for terminals configured in spatial multiplexing mode. 2A Used for PDSCH scheduling of UEs configured in CDD mode with large delay. 2B Used in transmission mode 8 (dual layer transmission) 2C Used in transmission mode 9 (multi-layer transmission) 2D Used for transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustment 3A Used for transmission of 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 terminals configured in the 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 A format 2 for scheduling, a format 2 for PDSCH scheduling in a closed-loop spatial multiplexing mode, a format 2A for PDSCH scheduling in an open-loop spatial multiplexing mode, an uplink channel And formats 3 and 3A for the transmission of TPC (Transmission Power Control) commands.

Each field of the DCI is sequentially mapped to _n information bits a ₀ through a _{n -1} . For example, if the DCI is mapped to a total of 44 bits of information bits, each DCI field is sequentially mapped to a ₀ to a ₄₃ . In one example, DCI formats 0, 1A, 3, and 3A may all have the same payload size. The DCI format 0 may be referred to as an uplink grant.

The wireless communication system 10 may be a multiple antenna system. A multi-antenna system may be referred to as a multiple-input multiple-output (MIMO) system. Or a multiple antenna system may be a multiple input single output (MISO) system or a single input single output (SISO) system or a single input multiple output (SIMO) system. A 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.

A multi-antenna transmission / reception scheme used for operation of a multi-antenna system includes a frequency switched transmit diversity (FSTD), a space frequency block code (SFBC), a space time block code (STBC), a cyclic delay diversity (CDD) , Time-switched transmit diversity (TSTD), or the like may be used.

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

)를 추정할 수 있다.The terminal 12 that knows the information of the reference signal can accurately obtain the data sent from the base station 11 by estimating the channel based on the received reference signal and compensating the channel value. If the reference signal sent from the base station 11 is p, the channel information experienced by the reference signal during transmission is h, the thermal noise generated in the terminal 12 is n, and the signal received by the terminal 12 is y, y = h * p + n ". At this time, since the terminal 12 already knows the reference signal p, when using the LS (Least Square) scheme, the channel information

) Can be estimated.

'는 '

'값에 의존하게 되므로, 정확한 h값의 추정을 위해서는 '

'값을 0에 수렴시킬 필요가 있다. 많은 개수의 참조 신호를 이용함으로써 '

'의 영향을 최소화하여 채널을 추정할 수 있다.Here, the channel estimation value "

The '

'Value. Therefore, in order to estimate the accurate h value,

'Value to zero. By using a large number of reference signals,

The channel can be estimated by minimizing the influence of the channel.

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

The downlink reference signal includes a CSI (Channel State Information) reference signal (CSI-RS) and a DMRS (DeModulation RS). The transmission pattern and configuration information are different for each reference signal.

<1. CSI-RS>

The CSI-RS may be used for estimation of channel state information (CSI). The CSI-RS is arranged in the frequency domain or the time domain. A channel quality indicator (CQI), a precoding matrix indicator (PMI), a rank indicator (RI), and the like are used to estimate channel state information using CSI- As shown in FIG.

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 conveyed over the first channel and the second symbol (or signal) is conveyed over the second channel, the first channel may be inferred by the second channel An antenna port is defined as an antenna port that conveys a first symbol (or signal) and the second symbol (or signal) together. channel over which another symbol on the same antenna port is conveyed).

One antenna port has a unique resource grid. Each element in the resource grid for an antenna port p is called a resource element RE and each resource element is identified by an index pair k, l in each slot where k = 0, ..., N ^DL _RB * N ^RB _sc -1, l = 0, ..., N ^DL _symb -1, 'k' is a subcarrier index in the frequency domain, 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 contains N OFDM symbols, then one slot contains a total of M * N resource elements.

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

The number of antenna ports and the resource grid unique to each antenna port are determined depending on the reference signal configuration in the cell. For example, if there are 64 physical antennas in total, the number of antenna ports supporting CSI-RS depends on the configuration of the CSI-RS and the arrangement of the CSI-RS ports on the physical antennas: {1, 2, 4, 8 , 16, 32, 64}, and each antenna port can have a unique pattern carrying CSI-RS as shown in FIG. 2 or FIG. Hereinafter, a 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 shows an example in which a CSI-RS is mapped to a resource element in the case of a normal CP (cyclic prefix), and FIG. 3 shows an example in which a CSI-RS is mapped to a resource element in the case of an extended CP Fig.

Referring to FIG. 2 and FIG. 3, R _p denotes a resource element used for CSI-RS transmission at the antenna port P. For example, R ₁₅ means the CSI-RS transmitted at the antenna port 15. For example, if one antenna port is supported in FIG. 2, the CSI-RS pattern is such that CSI-RS is mapped to resource elements 2, 5 and (2, 6) of antenna port 15. The CSI-RS pattern is mapped to the resource elements 2, 5 and (2, 6) of the antenna ports 15 and 16, and the antenna port 17 and / Mapped to the resource elements 3, 5 and 3, 6 of the antenna ports 19, 20 and mapped to the resource elements 8, 5 and 8, 6 of the antenna ports 21, (9, 5) and (9, 6).

Thus, the CSI-RS pattern unique to each antenna port can be obtained. The examples of FIGS. 2 and 3 define a total of eight antenna ports 15 to 22 for transmitting CSI-RS in a wireless communication system having eight physical antennas. However, in the case of a wireless communication system having 64 physical antennas, up to 64 antenna ports can be supported. In this case, the antenna ports for transmitting the CSI-RS can be extended to the antenna ports 15 to 63.

4 illustrates a multiple antenna system in accordance with an example of the present invention.

Referring to FIG. 4, a 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 the 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 8. Herein, when the base station 410 supports multi-user MIMO (MU-MIMO) operation, it can support 10 terminals.

<2. DMRS>

A network system can design a DMRS that supports multiple layers. Up to 8 layers can be supported for a single user MIMO (single user MIMO) of a terminal for transmission of DMRS, and up to 4 layers can be supported for multi-user MIMO. In a wireless communication system supporting up to 64 physical antennas, up to 8 layers may be supported for multi-user MIMO.

The reference signal is generally transmitted in a sequence. The reference signal sequence may be any sequence without any particular limitation. The reference signal sequence may use a PSK-based computer generated sequence (PSK) -based computer. 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 Zadoff-Chu based sequence, a ZC sequence with cyclic extension, and a ZC sequence with truncation. Alternatively, the reference signal sequence may use a PN (pseudo-random) sequence. Examples of PN sequences include m-sequences, computer generated sequences, Gold sequences, and Kasami sequences. Also, the reference signal sequence may use a cyclically shifted sequence.

The parameter used for generating the DMRS sequence includes an antenna port number, a scrambling identity nCSID, and the present embodiment may additionally include the number of resource elements. These parameters may be information used to impart DRX (Discontinuous RX) orthogonality.

The parameters used for generating the 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 in the following table.

field beat A carrier indicator 0 to 3 bits HARQ process number 3 bits for FDD, 4 bits for TDD Transmission Power Control (TPC) Commands for PUCCH 2 bits The downlink assignment index &lt; RTI ID = 0.0 &gt; 2 bits (For each transmission block) Modulation and coding scheme 5 bits (For each transport block) New data indicator 1 bit (For each transport block) redundancy version 2 bits (Resource block allocation) Local resource allocation

비트

beat (Resource block allocation) Distributed resource allocation

Bit or

beat Sequence Generation Value 4 bits A 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 DL allocation index field, and the like. do. The information fields included in Table 2 are illustrative, and the technical idea of the present invention includes not only the 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. For example, 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, the total number of 16 cases can be represented.

For a single user MIMO (SU-MIMO), the maximum number of layers for a DMRS is 8, the maximum number of layers is 2 for multi-user MIMO (MU-MIMO mode) The number of layers is supported as an example.

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

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 an antenna port number, a scrambling identifier, a layer number, and a number of resource elements, for example, 4-bit information. 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 limited to DCI in which at least one information field is omitted, DCI in which a new information field is added in addition to the information fields . 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 the total number of 16 cases.

The base station maps the DCI including the determined sequence generation value to the PDCCH and transmits it to the mobile station (S510). The terminal monitors the PDCCH to which the DCI is mapped to receive the DCI from the base station. If the UE successfully decodes the PDCCH, it obtains the DCI. The information field in the DCI is analyzed to check 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 determined DMRS sequence based on the sequence generation value (S515). The UE confirms the DMRS sequence using at least one of the number of layers indicated by the sequence generation value, the antenna port number, the scrambling ID, and the number of resource elements, and receives the DMRS from the base station using the ID. The DMRS may be transmitted over a data channel (e.g., PDSCH).

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

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

Referring to FIG. 6, the BS transmits information for setting a UE-specific IMR (or 'UE-specific IMR configuration information') to the UE (S600). IMR setting information is also referred to as IMR configuration information.

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

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

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

At this time, all the OFDM symbols including the DMRS may be configured as a UE-specific IMR or only a part of the OFDM symbols may be configured as a UE-specific IMR. If only a part of the OFDM symbol including the DMRS is configured with the UE-specific IMR, the DMRS or the CSI-RS may be further included in the remaining part.

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

Meanwhile, 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 set by the BS, the DMRS may be covered by the UE-specific IMR. Alternatively, information to be transmitted through the DMRS in the PDSCH region in which the UE-specific IMR is transmitted may also be transmitted. The resources allocated to the PDSCH region may be set by RRC signaling.

In another example, the UE-specific IMR configuration information may include 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 an initial state of the UE-specific DMRS scrambling. More specifically, the N ^DMRS _ID is a virtual cell ID for a DMRS scrambling initial state.

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

Information field Explanation IMRResourceConfig IMR pattern, 12-bit or 8-bit

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

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

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

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

Information field Explanation IMRResourceConfig Indicates the IMR pattern, 12-bit or 8-bit OCC indicator (OCCIndicator) Indicates OCC cover for interference measurement, 1 bit or 2 bits or 3 bits N ^DMRS _ID The DMRS scrambling initial state Virtual Cell ID for the initial state of the DMRS scrambling.
The virtual cell ID is a cell ID of a UE that is likely to be paired in an 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, an N ^DMRS _ID, and an n _SCID . If the UE-specific IMR is in the DMRS zone or if it is necessary to transmit DMRS-related information, the UE-specific IMR configuration information may include the IMR resource configuration indicator, the OCC indicator, the N ^DMRS _ID, and the n _SCID . Here, the case where the UE-specific IMR setting information includes the DMRS region refers to a case where the UE-specific IMR is set in an area allocated for transmission of the DMRS. It is also said that the terminal specific IMR is allocated to the DMRS area. Alternatively, the terminal-specific IMR may share the DMRS.

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

As an example, the OCC indicator, N ^DMRS _ID, and n _SCID may be the same format used in the existing DMRS. That is, the UE-specific IMR may be a format that further includes an IMR resource setting indicator in the DMRS. The N ^DMRS _ID is a two virtual cell ID value for a UE to be paired and is ^transmitted to the BS through the N ^DMRS _ID field.

On the other hand, there are two kinds of OCC covers of DMRS indicated by the OCC directors. An OCC cover with a length of 2, and an OCC cover with a length of 4. Accordingly, at least three types of OCC indicators are possible.

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

OCC indicator

0 [+1 +1] One [-1 +1]

Table 6 shows an example of a 2-bit OCC indicator, i.e., an OCC cover having a length of 4.

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 having a length of 2 and an OCC cover having a length of 4.

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', where the unit may be a bit.

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

n _SCID And the N ^DMRS _ID , the UE-specific DMRS scrambling initial state can be determined according to the following equation.

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

In step S600, if the UE-specific IMR is allocated to the DMRS area through RRC signaling, the UE measures (or estimates) the interference of the other UE through the UE-specific IMR S605).

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

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

Accordingly, the UE can measure a signal included in the UE-specific IMR and measure an interference signal (or a value including various noise) of another UE. For example, the UE of the MU-MIMO system can measure the interference of another UE based on the UE-specific IMR

The interference information from other UEs obtained through the UE-specific IMR can be applied to an advanced minimum MMSE receiver (e.g., an MMSE interference rejection combination (IRC) receiver) Can be used to improve the performance of detecting signals or data signals.

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

FIG. 7 shows an example of an IMR resource setting indicator for setting a terminal measurement IMR according to the present invention. And the size of the IMR resource setting indicator is 12 bits.

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

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

8 shows another example of an IMR resource setting indicator for setting a terminal measurement IMR according to the present invention. And the size of the IMR resource setting is 8 bits.

Referring to FIG. 8, the PRB may include sub-carriers (e.g., four) including REs that are likely to be occupied by the CSI-RS. The UE-specific IMR may be included in the remaining subcarriers (e.g., eight) except for subcarriers that are likely to be allocated for CSI-RS. Thus, the IMR resource configuration indicator of size 8 bits may indicate whether the sub-carriers for which the CSI-RS is unallocated include a UE-specific IMR. That is, a bit having a value of '1' among each bit of the IMR resource setting indicator indicates that the corresponding subcarrier includes the UE measurement IMR.

9 shows an example in which the UE measures interference (e.g., MU-MIMO interference) by another UE according to the present invention. Hereinafter, a UE measuring an interference will be described as UE _{i with an} index of 'i'.

Referring to FIG. 9, the UE estimates (910, 920, 940) a channel (H) through a region allocated with a DMRS in a PRB and measures interference (R _I ) ) Or estimates (930).

'를 추정(estimate)할 수 있다. 만약 'Nt * R_i' 크기의 프리코딩 매트릭스를 '

' 라고 표현한다면(express), 여기서, 'H'는 'Nr * Nt' 크기의 채널 매트릭스(channel matrix)이고, 'C_i'는 기지국에 의해 계산되는 단말 UE_i를 위한 'Nt * R_i'크기의 프리코딩 매트릭스(precoding matrix)이다. 여기서, Nr은 수신측의 안테나 개수를 의미하고, Nt는 전송측의 안테나 개수를 의미하고, Ri는 단말의 전체 레이어의 개수를 의미한다.The UE _i transmits the channel &lt; _{RTI ID} = 0.0 &gt;

Can be estimated. If the precoding matrix of size 'Nt * R _i '

Nt * R _i 'for the UE UE _i calculated by the base station, and' C _i 'is a channel matrix having a size of' Nr * Nt ' Size precoding matrix. Here, Nr denotes the number of antennas on the receiving side, Nt denotes the number of antennas on the transmitting side, and Ri denotes the total number of layers of the terminal.

The signal Y received by the terminal UE _i can be expressed by the following equation.

'(j=1,…,N and j≠i)는 다른 단말 UE_j에 대한 채널이다. 'I'는 단말(UE_i)에 대한 잡음(noise)과 셀 간 간섭(inter-cell interference)등을 합한 것이다. X_i는 단말 UE_i의 데이터 심볼(data symbol), X_j는 다른 단말 UE_j의 데이터 심볼이다.Here,

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

)을 얻을 수 있다. 다음 수학식은 데이터 심볼을 구하는 방법의 일 예를 나타낸다.The UE _i is connected to a data symbol (Y) of the received signal Y by a linear receiver

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

Where W _i is the detection weight of the UE _i .

The detection weight W _i of the UE is divided into a case where the UE-specific IMR is a new RE (for example, when it is not in the DMRS region) and a case where the UE-specific IMR is in the DMRS region.

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

When the UE-specific IMR is a new type of RE (e.g., not in the DMRS region, or based on the UE-specific IMR configuration information as shown in Table 3), the UE _i sets PDSCH (Or the data of the PDSCH is removed from the corresponding area, or the data of the PDSCH is ignored in the corresponding area, or the PDCSH is punctured in the corresponding area).

At this time, the received signal (Y _IMR ) in the UE-specific IMR region can be expressed by the following equation.

Here, the correlation property of the sum of noise and inter-cell interference 'I' can be measured (or estimated) by CRS RE (Cell-specific Reference Signal RE), which is also referred to as R _I.

라 한다)을 측정(또는 추정)할 수 있다. Therefore, by removing (or offsetting) the influence of _I by using R _I , the terminal UE _i can obtain the interference

Can be measured (or estimated).

In the MU-MIMO system, the UE can obtain a statistic property (R _{MU -MIMO} ) of the interference by jointly combining the CRS RE and the UE-specific IMR. The following equation is an example of R _MU- .

R _{MU - MIMO} And The MMSE IRC receiver may improve performance (e.g., PDSCH detection performance) using (or controlling or adjusting) the 'detection weights W _i ' with R _I. For example, MMSE performance can be improved by suppressing inter-cell interference and MU-MIMO interference. The following equation shows an example of the detection weight W _i .

<2. If the UE-specific IMR is in the DMRS zone>

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

The OCC indicator, N ^DMRS _ID And when the n _SCID indicates the sum of the two antenna ports DMRS, the OCC length of the DMRS of the other terminal is 4 and the OCC length indicating the OCC indicator is 2.

If the UE knows that the DMRS indicated by the parameters (OCC indicator, N ^DMRS _ID, and n _SCID ) is not the DMRS of the UE itself, the UE uses the DMRS indicated by the parameters, (Or estimate) the interference from the base station.

At this time, when the UE-specific IMR is in the DMRS region, the interference of two UEs in the MU-MIMO can be suppressed. However, since there is no need to allocate an additional RE to the UE-specific IMR, there is an advantage in that the overhead is small.

)을 추정할 수 있다. 단말 특정 IMR이 안테나 포트 8을 지시하면, 단말 UE_i는 상기 DMRS 안테나 포트 8에 의하여 다른 단말UE_j의 프리코딩된 채널(

)을 추정할 수 있다.For example, if the UE is '7' DMRS port of UE _{i, i,} by the terminal UE DMRS antenna port 7 are precoded channel (

) Can be estimated. If the UE-specific IMR indicates an antenna port 8, the UE _i is notified of the precoded channel of the UE _j by the DMRS antenna port 8

) Can be estimated.

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

R _{MU - with MIMO} and R _{I ,} The MMSE IRC receiver may increase performance (e.g., PDSCH detection capability) using (or controlling or adjusting) the detection weights W _i . The following equation shows another example of the detection weight W _i of the terminal UE _i .

'에 대한 단말 UE_i의 간섭을 제거(또는 제어, 또는 조정, 또는 억제)할 수 있다.That is, using the detection weight W _i , the UE transmits a pre-

It may be the interference of the terminal UE _i to "remove (or control, or regulating, or inhibiting).

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

Referring to FIG. 10, the UE receives RRC signaling for setting up a UE-specific IMR from the BS (S1000). Alternatively, the RRC message (e.g., RRC connection reset message, RRC connection reconfiguration message) transmitted by the base station to the UE may include information for setting a UE-specific IMR (i.e., UE-specific IMR configuration information).

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

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

As another example, all of the OFDM symbols including the DMRS may be configured as a UE-specific IMR, or only a part thereof may be configured as a UE-specific IMR. If only a part of the OFDM symbol including the DMRS is configured with the UE-specific IMR, the DMRS or the CSI-RS may be further included in the remaining part.

As another example, the pattern of the UE-specific IMR may be configured to resemble the pattern of the DMRS. At this time, if the UE-specific IMR is set by the BS, the DMRS may be covered by the UE-specific IMR. Alternatively, information to be transmitted through the DMRS in the PDSCH region in which the UE-specific IMR is transmitted may also be transmitted. The resources allocated to the PDSCH region may be set by RRC signaling.

As another example, the UE-specific IMR setting information may include an IMR resource setting indicator as shown in Table 3 above. The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

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. At this time, 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. Also, n _SCID And N ^DMRS _ID may be a value for determining the UE-specific DMRS scrambling initial state as shown in Equation (2). The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

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

Then, the UE measures (or estimates) interference (e.g., MU-MIMO interference) based on the UE-specific IMR (S1015). For example, the UE can measure the interference according to the method shown in FIG.

Based on the established UE-specific IMR, the UE mutes the portion to which the UE-specific IMR is allocated in the PDSCH (or removes PDSCH data in the corresponding region, or ignores PDSCH data in the corresponding region, PDCSH). Accordingly, the terminal can distinguish (or measure) signals transmitted to other terminals or other interference signals such as noise.

For example, if 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 using the UE- in the Y _IMR based combine CRS RE and the UE-specific IMR as the equation 6 (joint) to the statistical properties of the interference (R _{MU - MIMO)} calculations and, R _{MU -} as shown in equation (7) based on the _MIMO The terminal weight W _i can be calculated and data can 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 statistical properties of the interference (R _{MU - MIMO)} calculations, and R _{MU -} based on the _MIMO terminals weight as equation 9 (W _i) to calculate, and a linear receiver, such as the equation (4) based on the W _i Can be used to obtain data from the received signal.

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

11 is a flowchart showing an example of the operation of a base station that sets resource elements according to the present invention.

Referring to FIG. 11, the BS sets the UE-specific IMR to the UE using RRC signaling (S1100). For example, an RRC message (e.g., an RRC connection reset message, an RRC connection reconfiguration message) transmitted by the base station to the UE may include information for setting a UE-specific IMR (i.e., UE-specific IMR configuration information).

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

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

As another example, all of the OFDM symbols including the DMRS may be configured as a UE-specific IMR, or only a part thereof may be configured as a UE-specific IMR. If only a part of the OFDM symbol including the DMRS is configured with the UE-specific IMR, the DMRS or the CSI-RS may be further included in the remaining part.

As another example, the pattern of the UE-specific IMR may be configured to resemble the pattern of the DMRS. At this time, if the UE-specific IMR is set by the BS, the DMRS may be covered by the UE-specific IMR. Alternatively, information to be transmitted through the DMRS in the PDSCH region in which the UE-specific IMR is transmitted may also be transmitted. The resources allocated to the PDSCH region may be set by RRC signaling.

As another example, the UE-specific IMR setting information may include an IMR resource setting indicator as shown in Table 3 above. The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

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. At this time, 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. Also, n _SCID And N ^DMRS _ID may be a value for determining the UE-specific DMRS scrambling initial state as shown in Equation (2). The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

The BS schedules the downlink MU-MIMO transmission (S1105).

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

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

Referring to FIG. 12, the terminal 1200 includes a receiving unit 1205 or a control unit 1210. The control unit 1210 includes a sensing unit 1215, a channel estimation unit 1220, or an interference measurement unit 1225.

Receiving unit 1205 receives RRC signaling for establishing a UE-specific IMR from base station 1250. Or receiver 1205 receives an RRC message (e.g., an RRC connection reset message, an RRC connection reconfiguration message) including information for setting a UE-specific IMR (i.e., UE-specific IMR configuration information).

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

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

As another example, all of the OFDM symbols including the DMRS may be configured as a UE-specific IMR, or only a part thereof may be configured as a UE-specific IMR. If only a part of the OFDM symbol including the DMRS is configured with the UE-specific IMR, the DMRS or the CSI-RS may be further included in the remaining part.

As another example, the pattern of the UE-specific IMR may be configured to resemble the pattern of the DMRS. At this time, if the UE-specific IMR is set by the BS 1250, the DMRS may be covered by the UE-specific IMR. Alternatively, information to be transmitted through the DMRS in the PDSCH region in which the UE-specific IMR is transmitted may also be transmitted. The resources allocated to the PDSCH region may be set by RRC signaling.

As another example, the UE-specific IMR setting information may include an IMR resource setting indicator as shown in Table 3 above. The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

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. At this time, 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. Also, n _SCID And N ^DMRS _ID may be a value for determining the UE-specific DMRS scrambling initial state as shown in Equation (2). The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

The sensing unit 1215 first detects a PDCCH in order to receive the PDSCH, and the channel estimation unit 1220 estimates a downlink channel based on the DMRS.

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

Based on the established UE-specific IMR, the interference measuring unit 1225 mutes the portion to which the UE-specific IMR is allocated in the PDSCH (or removes the PDSCH data in the corresponding region or ignores the PDSCH data in the corresponding region , Or punctures PDCSH in that area). The interference measuring unit 1225 may distinguish (or measure) signals transmitted to other terminals or other interference signals such as noise.

For example, if the UE-specific IMR is a new RE (e.g., if it is not in the DMRS region), the interference measurement unit 1225 uses the UE-specific IMR to calculate the received signal Y _IMR ) to calculate and, on the basis of the Y _IMR combined (joint), the CRS RE and the UE-specific IMR as equation (6), the statistical properties of the interference (R _{MU -} calculating _MIMO), and R _{MU -} wherein based on the _MIMO The terminal weight W _i can be calculated as shown in Equation (7), and data can be obtained from the received signal using a linear receiver as shown in Equation (4) based on W _i .

As another example, the UE-specific IMR is the case in the DMRS region, the interference measurement unit 1225 estimates the channel (H _i) of the terminal 1200 to estimate the channel (H _j) of the other station, H _i and H _j statistical properties of the interference as shown in the equation (8) for on the basis of (R _{MU - MIMO)} calculations and, R _{MU -} based on the based on the _MIMO and calculates the UE weights (W _i) as shown in equation 9, W _i The data can be obtained from the received signal using a linear receiver as shown in Equation (4).

The receiving unit 1205 detects the PDSCH through a receiver (e.g., an MMSE IRC receiver) and receives data. Accordingly, the terminal 1200 can improve the performance by applying the measured interference information from the other terminals to the MMSE receiver.

The base station 1250 includes a transmission unit 1255 and a control unit 1260. The control unit 1260 may further include a scheduling unit 1265.

And transmits the RRC signaling to the terminal 1200 to set the UE-specific IMR. For example, an RRC message (e.g., an RRC connection reset message, an RRC connection reconfiguration message) transmitted from the transmitter 1255 to the terminal 1200 may include information for setting a UE-specific IMR .

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

As another example, the UE-specific IMR setting information may be set such that the UE-specific IMR exists in an OFDM symbol including a DMRS.

As another example, all of the OFDM symbols including the DMRS may be configured as a UE-specific IMR, or only a part thereof may be configured as a UE-specific IMR. If only a part of the OFDM symbol including the DMRS is configured with the UE-specific IMR, the DMRS or the CSI-RS may be further included in the remaining part.

As another example, the pattern of the UE-specific IMR may be configured to resemble the pattern of the DMRS. At this time, if the UE-specific IMR is set by the BS 1250, the DMRS may be covered by the UE-specific IMR. Alternatively, information to be transmitted through the DMRS in the PDSCH region in which the UE-specific IMR is transmitted may also be transmitted. The resources allocated to the PDSCH region may be set by RRC signaling.

As another example, the UE-specific IMR setting information may include an IMR resource setting indicator as shown in Table 3 above. The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

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. At this time, 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. Also, n _SCID And N ^DMRS _ID may be a value for determining the UE-specific DMRS scrambling initial state as shown in Equation (2). The IMR resource setting indicator may be the indicator described in FIG. 7 to FIG.

The scheduling unit 1265 schedules the downlink MU-MIMO transmission.

The transmission unit 1255 transmits PDSCH or DMRS to the terminal 1200. For example, based on the established UE-specific IMR, the transmission unit 1255 mutes the portion to which the UE-specific IMR is allocated in the PDSCH (or removes the PDSCH data from the corresponding region, , Or punctures PDCSH in that area).

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (20)

A method for establishing a resource element by a UE in a multi-antenna system,
Receiving RRC (Radio Resource Control) signaling for setting a UE-specific Interference Measurement Resource element (IMR) from a base station; And
Mute the portion of the Physical Downlink Shared Channel (PDSCH) to which the UE-specific IMR is allocated based on the UE-specific IMR and measure interference from the other UEs,
The RRC signaling may include setting the UE-specific IMR to be located on the PDSCH, or setting the UE-specific IMR to be present in an OFDM symbol including a DMRS (DeModulation Reference Signal) The resource element setting method comprising the steps of: The method according to claim 1,
Wherein the UE-specific IMR configuration information further comprises an IMR resource configuration indicator indicating an IMR pattern as to whether each sub-carrier of a physical resource block (PRB) includes a UE-specific IMR. 3. The method of claim 2,
Wherein the UE-specific IMR configuration information further includes an OCC indicator indicating an OCC (OCC) cover having a length of 2 or an OCC cover having a length of 4. The method of claim 3,
Wherein the UE-specific setting information further includes information transmitted through the DMRS. The method according to claim 1,
The UE-specific IMR setting information includes
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 further configured to include DMRS or CSI-RS (Channel State Information-RS) How to set up resource elements. The method according to claim 1,
Further comprising estimating a downlink channel based on the DMRS,
And measures an interference signal from the other terminal based on the downlink channel. A method for establishing a resource element by a base station in a multi-antenna system,
And transmitting RRC (Radio Resource Control) signaling for setting a UE-specific Interference Measurement Resource element (IMR) to the UE,
The RRC signaling may include setting the UE-specific IMR to be located on the PDSCH, or setting the UE-specific IMR to be present in an OFDM symbol including a DMRS (DeModulation Reference Signal) The resource element setting method comprising the steps of: 8. The method of claim 7,
Further comprising scheduling a downlink transmission,
And transmitting the PDSCH or the DMRS to the UE based on the scheduling. 9. The method of claim 8,
Wherein the PDSCH is muted with a portion to which the UE-specific IMR is allocated. 8. The method of claim 7,
Wherein the UE-specific IMR configuration information further comprises an IMR resource configuration indicator indicating an IMR pattern as to whether each sub-carrier of the PRB includes a UE-specific IMR. 8. The method of claim 7,
Wherein the UE-specific IMR setting information further comprises an OCC indicator indicating an OCC cover having a length of 2 or an OCC cover having a length of 4. 12. The method of claim 11,
Wherein the UE-specific setting information further includes information transmitted through the DMRS. A terminal for setting resource elements in a multi-antenna system,
A receiver for receiving Radio Resource Control (RRC) signaling for setting a UE-specific Interference Measurement Resource element (IMR) from a base station; And
And an interference measuring unit for measuring an interference from another terminal by muting a portion to which a UE-specific IMR is assigned in a PDSCH based on the UE-specific IMR,
The receiver may further comprise:
Specific IMR configuration information for setting the UE-specific IMR to be located in the PDSCH or setting the UE-specific IMR to exist in an OFDM symbol including a DMRS (DeModulation Reference Signal) And receives the signaling. 14. The method of claim 13,
The receiver may further comprise:
Specific IMR configuration information further comprising an IMR resource configuration indicator indicating an IMR pattern as to whether each sub-carrier of a physical resource block (PRB) includes a UE-specific IMR. 15. The method of claim 14,
The receiving unit
The terminal receiving the UE-specific IMR configuration information further comprising an OCC indicator indicating an OCC cover of length 2 or an OCC cover of length 4. [ 14. The method of claim 13,
And a channel estimator for estimating a downlink channel based on the DMRS,
Wherein the interference measuring unit comprises:
And measures an interference signal from the other terminal based on the downlink channel. A base station for establishing resource elements in a multi-antenna system,
And a transmitter for transmitting RRC (Radio Resource Control) signaling for setting a UE-specific Interference Measurement Resource element (IMR) to the UE,
The RRC signaling may include setting the UE-specific IMR to be located on the PDSCH, or setting the UE-specific IMR to be present in an OFDM symbol including a DMRS (DeModulation Reference Signal) The base station comprising: 18. The method of claim 17,
Wherein the transmission unit comprises:
And mutes a portion of the PDSCH to which the UE-specific IMR is allocated, and transmits the mute signal. 18. The method of claim 17,
Wherein the transmission unit comprises:
Specific IMR configuration information further comprising an IMR resource configuration indicator indicating an IMR pattern as to whether each sub-carrier of the PRB includes a UE-specific IMR. 20. The method of claim 19,
Wherein the transmission unit comprises:
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;

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