KR20120122816A - Method and Apparatus for Transmitting/Receiving Reference Signal in Wireless communication system - Google Patents

Abstract

PURPOSE: A method and apparatus for transceiving a reference signal in a wireless communication system is provided to improve operational performance in an MU-MIMO mode by eliminating interference due to a terminal. CONSTITUTION: A wireless communication system(100) comprises an eNB(evolved node B)(110) and two or more UEs(120-1-120-n). The UEs represents a user terminal in a wireless telecommunication. The eNB or a cell generally represents all apparatuses and functions or a specific area which communicates with the UEs. The wireless communication system supports an uplink and/or down link HARQ(hybrid automatic request). The eNB transmits specifically related down link control information(130-1-130-n) to the UEs in order to support transmission of down link and uplink transfer channels. [Reference numerals] (130-1, 130-n) Control signal; (140-1, 141-n) Reference signal and data

Description

Method and apparatus for transmitting and receiving a reference signal in a wireless communication system {Method and Apparatus for Transmitting / Receiving Reference Signal in Wireless communication system}

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for constructing and transmitting a reference signal.

As communication systems have evolved, consumers, such as businesses and individuals, have used a wide variety of wireless terminals.

Current wireless communication system is a high-speed large-capacity communication system capable of transmitting and receiving various data such as video, wireless data, etc., away from voice-oriented services, and it is required to develop a technology capable of transmitting large-capacity data corresponding to a wired communication network.

However, there is a problem in that a performance degradation of a wireless communication system occurs due to interference caused by other UEs sharing resources in a multiple input multiple output mode. Therefore, there is a need for a request for solving the performance degradation of a wireless communication system.

The present specification provides an apparatus and method for configuring a reference signal in a wireless communication system.

The present specification provides an apparatus and method for transmitting and receiving a reference signal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting and receiving configuration information for configuring a reference signal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for extracting a reference signal and configuration information of the reference signal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting and receiving reference signals and reference signal configuration information for configuring a reference signal for a specific terminal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting and receiving reference signal and reference signal configuration information for another terminal using a resource region such as a specific terminal in a wireless communication system.

In addition, the present disclosure provides an apparatus and method for transmitting an index having a variable number of layers, an antenna port, and a scrambling code in response to a set codeword in a wireless communication system.

In addition, the present disclosure, a device for receiving a reference signal by extracting the reference signal by checking the number of the variable layer, the antenna port, and the scrambling code corresponding to the set codeword, using the index defined for the reference signal in the wireless communication system And methods.

In addition, the present disclosure provides an apparatus and method for transmitting and receiving a reference signal for removing interference by other UEs sharing resources in a multiple input multiple output mode in a wireless communication system.

In one aspect of the present invention to solve the above problems in the base station (eNB) to transmit the configuration information of the reference signal and the reference signal to the specific terminal (UE), the base station generates a reference signal and transmits to the specific terminal ; And transmitting the reference signal to a terminal using the same resource region, including the number of layers allocated by the base station to transmit a reference signal to a specific terminal, an antenna port and a scrambling ID for the layer, and a specific terminal or a specific terminal. The present invention provides a method comprising transmitting reference signal information indicating the total number of all allocated layers.

In another aspect, the present invention, when a specific terminal (UE) receives a reference signal and reference signal information from the base station (eNB) to extract the reference signal, the number of layers allocated for transmitting the reference signal from the base station to the specific terminal, Receiving reference signal information indicating the total number of all layers allocated for transmitting a reference signal to terminals using the same resource region including an antenna port and a scrambling ID for the layer and a specific terminal or a specific terminal; ; Receiving a reference signal from a base station; And extracting a reference signal sequence using the reference signal information.

In another aspect, the present invention is a transmission device for transmitting the configuration information of the reference signal and the reference signal to a specific terminal (UE), the reference signal sequence generation unit for generating a reference signal sequence; And reference to a terminal using the same resource region, including the generated reference signal sequence and the number of layers allocated for transmitting a reference signal to a specific terminal, an antenna port and a scrambling ID for the layer, and a specific terminal or a specific terminal. And a resource element mapper for allocating the reference signal information time-frequency resource region indicating the total number of all allocated layers in transmitting the signal.

In still another aspect, the present invention provides a receiver for receiving a signal from a transmitter and extracting a reference signal, the receiver comprising: a reception processor for receiving a signal; The same resource region is used, including the reference signal sequence and the number of allocated layers, the antenna port and the scrambling ID for the layer, and the specific terminal or the specific terminal, from the resource element of the received signal. A resource element demapper for demapping reference signal information indicating the total number of all allocated layers in transmitting a reference signal to a mobile station; And a reference signal sequence extracting unit extracting a reference signal sequence using the reference signal information.

In another aspect, the present invention, in the method for transmitting and receiving a reference signal in a wireless communication system, the base station corresponding to the number of codewords set the number of different layers, the antenna port and the scrambling ID ( n _SCID ) for the layer And transmitting to the terminal an index indicating the total number of allotted layers for other terminals using the same resource region, including the specific terminal, and the terminal receiving the index from the base station, the number of allocated layers Check the antenna port and the scrambling ID ( n _SCID ) for the layer, and based on the total number of the allocated total layers, the number of layers allocated to other terminals, the antenna port for the layer allocated to other terminals, and characterized by checking the scrambling identity _(SCID n) by removing the interference in that it comprises the step of receiving a reference signal It shall be.

를 도시하고 있다.
도 5는 본 발명이 적용되는 안테나 포트들 7 및 8에 대한 확장된(extended) CP에 대한 DM-RS에 사용되는 자원요소

를 도시하고 있다.
도 6는 본 발명의 일 실시예에 따른 수신장치의 구성도이다.
도 7 본 발명의 일 실시 예에 따른 참조신호를 송신하는 신호 흐름도이다.
도 8은 본 발명의 일 실시 예에 따른 참조신호를 수신하는 신호 흐름도이다. 1 is a system configuration diagram of a wireless communication system to which the present invention is applied.
2 is a diagram illustrating a format of control information according to an embodiment of the present invention.
3 is a block diagram of a transmitter according to an embodiment of the present invention.
4 is a resource element used for DM-RS for normal CP for antenna ports 7 to 14 to which the present invention is applied;

It is shown.
5 is a resource element used for DM-RS for an extended CP for antenna ports 7 and 8 to which the present invention is applied;

It is shown.
6 is a block diagram of a receiving apparatus according to an embodiment of the present invention.
7 is a signal flowchart for transmitting a reference signal according to an embodiment of the present invention.
8 is a signal flowchart for receiving a reference signal according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention 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 to refer to the same components as much as possible even though they are shown in different drawings. In the following description 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 invention rather unclear.

1 is a system configuration diagram of a wireless communication system to which the present invention is applied.

The wireless communication system 100 according to an embodiment for providing various communication services such as voice and packet data may include an eNB 110 and two or more UEs 120-1,..., 120-n, and n is a natural number of two or more. It includes.

UEs 120-1,..., 120-n in the present specification are generic concepts meaning user terminals in wireless communication, and of course, user equipment (UE) in WCDMA and Long Term Evolution (LTE), HSPA, and the like. It should be interpreted as a concept that includes a mobile station (MS), a user terminal (UT), a subscriber station (SS), and a wireless device in GSM.

An eNB 110 or cell generally refers to any device or function or specific area that communicates with UEs 120-1,..., 120-n, and includes a Node-B, a sector ( Other terms may be referred to as a sector, a site, a base transceiver system (BTS), an access point, a relay node, and the like.

That is, in the present specification, the eNB 110 or a cell is a part covered by a base station controller (BSC) in CDMA, a NodeB in WCDMA, an eNB (or a site) or a sector in LTE. It should be interpreted as a comprehensive meaning of an area or function, and encompasses various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node communication range.

Various multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA This can 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.

The wireless communication system 100 to which the present invention is applied may support uplink and / or downlink HARQ, and may use a channel quality indicator (CQI) for link adaptation. In addition, multiple access schemes for downlink and uplink transmission may be different. For example, downlink uses Orthogonal Frequency Division Multiple Access (OFDMA), and uplink uses a single carrier-frequency division multiple (SC-FDMA). Access can be used.

In the LTE communication system, in case of downlink, a cell-specific reference signal (CRS), a MBSFN reference signal (Multicast / Broadcast over Single Frequency Network Reference Signal (MBSFN-RS), a UE-specific reference signal (UE) Reference signals (or reference signals, RS) such as -specific reference signals are defined. The UE-specific reference signal is also called a demodulation reference signal (DM-RS) according to its purpose.

In the present specification, a layer refers to a data layer that is mapped to each antenna port in an eNB or a UE and can be transmitted logically at the same time. However, data of each layer may be the same or different. Therefore, the number of layers may be equal to or smaller than the number of antenna ports.

On the other hand, the antenna port (antenna port) is used to represent the time-frequency resource region that is divided into each spatial (spatial). Therefore, when the antenna port number is different in the antenna port used for the same purpose, this means a time-frequency resource region that is spatially distinguished as different antennas.

For example, the antenna port numbers for CRSs using up to four antennas range from 0 to 3, with MBSFN-RS, LTE Rel-8 UE-specific RS (DM-RS), and Positioning (PRS) using up to one antenna each. Reference Signal) is 4, 5 and 6 antenna port numbers, respectively. In addition, the antenna port number of LTE Rel-9 / 10 DM-RS using up to 8 antennas is 7 to 14. The CSI-RS uses up to eight antennas too, so the antenna port number is 15 to 22. In this case, when the antenna port number is different within each specific reference signal (RS), it means that the antennas have time-frequency resource regions that are spatially distinct from each other.

The wireless communication system 100 according to an embodiment is a multiple input multiple output (MIMO) wireless communication system. There are two types of multi-input multi-output wireless communication systems: single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO).

The eNB 110 sends specific relevant downlink control information 130-1,..., 130-n to the UEs 120-1,..., 120-n to support transmission of downlink and uplink transport channels. send. The downlink control information 130-1,..., 130-n includes reference signals and data 140-1,..., 140-140 which the eNB 110 transmits to the UEs 120-1,..., 120-n. n) an uplink scheduling grant informing downlink scheduling assignment information including information necessary for properly receiving and demodulating / decoding and resources and transmission format used by the UE for uplink transmission. ) And HARQ ACK / NACK information for uplink transmission.

The physical downlink control channel (PDCCH) carries downlink control information 130-1, ..., 130-n. This physical downlink control channel (PDCCH) is transmitted in an aggregation of one or more consecutive Control Channel Elements (CCEs). The PDCCH carrying control information 130-1,..., 130-n supports various PDCCH formats as shown in Table 1 below.

 PDCCH Formats Number of CCEs Number of resource element groups PDCCH Bits 0 One 9 72 One 2 18 144 2 4 36 288 3 8 72 576

The downlink control information 130-1,..., 130-n are classified into downlink control information (DCI) formats having a defined format. These DCI formats are classified according to specific message size and purpose.

2 is a format configuration diagram of downlink control information (DCI) according to an embodiment of the present invention. In this case, the format of the DCI format is exemplarily illustrated in FIG. 2, but may be the format of any DCI formats present or future.

Referring to FIG. 2, the DCI format 200 may include a Carrier Indicator Field (CIF) 210, resource allocation information 220, and reference signal information 230.

A Carrier Indicator Field (CIF) may be 0 or 3 bits. The carrier identifier 210 may indicate a component carrier including a PDCCH carrying control information of a DCI format in a carrier aggregation environment in which a plurality of component carrier CCs up to 20 MHz may be bundled and used. have.

Each of the M downlink CCs (M is one or more natural numbers) includes a physical downlink shared channel (PDSCH). Meanwhile, each downlink component carrier (CC) may or may not include a physical downlink control channel (PDCCH). That is, a control channel may be included in all downlink component carriers (CCs) among all the downlink component carriers (CCs), and a control channel may be included only in some downlink component carriers (CCs).

As such, an element carrier identifier (CIF) 210, which is CC identification information when one PDCCH is scheduling one or more CCs, may indicate two or more CCs. In addition, the CC may be referred to as a serving cell (Scell). One serving cell (Scell) may mean a downlink CC or an uplink CC. In addition, the Scell may mean a combination of a downlink CC and an optional uplink CC. In general, when carrier aggregation is not considered, uplink and downlink CCs always exist in pairs in one cell.

The resource allocation information 220 may include downlink scheduling allocation information or uplink scheduling grant information.

The reference signal information 230 may include reference signal configuration information such as an antenna port (s), a scrambling identity, a number of layers, and the like.

The reference signal is a cell-specific reference signal signal (Cell-Specific Reference Signal CRS) for identifying channel information during downlink and a UE- for demodulating a physical channel, for example, a physical downlink shared channel PDSCH. It may be one of a UE-Specific Reference Signal (DM-RS) and a Channel State Information Reference Signal (CSI-RS) for estimating channel state information. Hereinafter, a DM-RS is described as an example of a reference signal, but the present specification is not limited thereto.

For example, the reference signal information 230 transmitted by the eNB to a specific UE includes an antenna port (Santenna port (s)) and a scrambling ID, and the number of layers allocated for transmitting a reference signal to the specific UE, as shown in Table 2. With reference signal configuration information including number of layers, the total number of layers allocated for transmitting a reference signal to the UE and other UE (s) connected to the corresponding UE and MU-MIMO and using the same resource region (total) number of layers).

Here the total number of layers is added in the embodiment of the present invention to improve the MU-MIMO operation. In Table 2, the table on the left is for the case of using one codeword (CW), and the table on the right is for the case of using two codewords (CW).

One codeword:
Codeword 0 enabled,
Codeword 1 disabled Two codewords:
Codeword 0 enabled,
Codeword 1 enabled Value Message Value Message 0 1 layer, port 7, n _SCID = 0, L _total = 1 0 2 layers, ports 7-8, n _SCID = 0, L _total = 2 One 1 layer, port 7, n _SCID = 0, L _total = 2 One 2 layers, ports 7-8, n _SCID = 0, L _total = 3 2 1 layer, port 7, n _SCID = 0, L _total = 3 2 2 layers, ports 7-8, n _SCID = 0, L _total = 4 3 1 layer, port 7, n _SCID = 0, L _total = 4 3 2 layers, ports 7-8, n _SCID = 1, L _total = 2 4 1 layer, port 7, n _SCID = 1, L _total = 1 4 2 layers, ports 7-8, n _SCID = 1, L _total = 3 5 1 layer, port 7, n _SCID = 1, L _total = 2 5 2 layers, ports 7-8, n _SCID = 1, L _total = 4 6 1 layer, port 7, n _SCID = 1, L _total = 3 6 3 layers, ports 7-9 7 1 layer, port 7, n _SCID = 1, L _total = 4 7 4 layers, ports 7-10 8 1 layer, port 8, n _SCID = 0, L _total = 1 8 5 layers, ports 7-11 9 1 layer, port 8, n _SCID = 0, L _total = 2 9 6 layers, ports 7-12 10 1 layer, port 8, n _SCID = 0, L _total = 3 10 7 layers, ports 7-13 11 1 layer, port 8, n _SCID = 0, L _total = 4 11 8 layers, ports 7-14 12 1 layer, port 8, n _SCID = 1, L _total = 1 12 Reserved 13 1 layer, port 8, n _SCID = 1, L _total = 2 13 Reserved 14 1 layer, port 8, n _SCID = 1, L _total = 3 14 Reserved 15 1 layer, port 8, n _SCID = 1, L _total = 4 15 Reserved 16 2 layers, ports 7-8 17 3 layers, ports 7-9 18 4 layers, ports 7-10 19-31 Reserved

As shown in Table 2, the reference signal information 230 is included in the control information 200 as an index (index or indicator) indicating the antenna port and the scrambling ID, the number of layers, and the total number of layers. In Table 2, since the maximum number of antenna ports, scrambling IDs, the number of layers, and the total number of layers is 19, the number of indexes indicating them is also 19 at maximum.

Therefore, when the reference signal information 230 is configured with a total of 32 indexes, including up to 19 indexes, which are not used as shown in Table 2 and reserved, to represent a maximum of 19 indexes, the reference signal information 230 may be represented using 5 bits.

For example, when the reference signal information 230 includes the index "5", the UE that has received the reference signal information 230 has a total number of layers of 2, the number of layers assigned to itself is one, and the antenna port number is It can be seen that the scrambling ID n _SCID is 0. In addition, the UE not only extracts its own DM-RS using this reference signal information 230, but may also know DM-SR configuration information of another UE connected to MU-MIMO and using the same resource region.

As such, the reference signal information 230 transmitted by the eNB 110 to a specific UE is not only the reference signal configuration information of the specific UE, but also the eNB 110 is connected to the specific UE and MU-MIMO to use the same resource region. Since the total number of layers allocated for transmitting a reference signal to other UE (s) is included, a specific UE, for example, UE 120-1, which has received the control information of the DCI format shown in FIG. The total number of layers of the information 230 and the number of layers of the information 230 may be compared to determine whether the layer is in the SU-MIMO mode or the MU-MIMO mode. In addition, when the UE 120-1 is in the MU-MIMO mode, the UE 120-1 may be connected to the MU-MIMO to know the total number of layers of other UE (s) using the same resource region, an antenna port, and a scrambling ID associated with the same. .

In more detail, the total number of layres allocated by the eNB 110 to transmit a reference signal in a specific resource region is greater than the number of layres allocated to transmit a reference signal to a specific UE. In this case, the UE 120-1 may know whether the MU-MIMO mode is present. In addition, the UE 120-1 may be connected to MU-MIMO to know antenna ports and scrambling IDs for layers allocated to transmit reference signals to other UE (s) using the same resource region. The interference on (120-1) can be accurately known. Reference Signal Information Here, the UE 120-1 blind-decodes an antenna port and a scrambling ID for layers allocated to transmit a reference signal to other UE (s) connected with MU-MIMO and using the same resource region. This can be known by performing decoding or blind detection.

The total number of layers of the reference signal information 230 and a blind search to the UE (120-1) through the antenna port and the scrambling ID for the allocated layers to transmit the reference signal to other UE (s) found The interference may be accurately known, and from this, the UE 120-1 may perform interference cancellation during MU-MIMO operation.

When performing the MU-MIMO operation, the UE 120-1 knows the antenna port and the scrambling ID for the layers allocated for transmitting the reference signal to the other UE (s) without performing the blind search. Depending on the total, the antenna port and the scrambling ID for each layer used may be fixed.

The total number of layers Antenna Port and Scrambling ID 2 Antenna port 7, 8 with n _SCID = 0 3 Antenna port 7, 8 with n _SCID = 0
And antenna 7 n _SCID = 1 4 Antenna port 7, 8 with n _SCID = 0
And antenna 7, 8 with n _SCID = 1

In the MU-MIMO operation, as shown in Table 3, when fixing the antenna port and the scrambling ID for each layer to be used according to the total number of layers, as shown in the above example, when the reference signal information 230 includes the index "5" The UE that has received the RS 230 has a total number of layers 2 through Table 2, a number of layers allocated to itself for transmitting a RS, an antenna port number 7 for that layer, and a scrambling ID. It can be seen that (n _SCID ) is 0.

Additionally, when using a total of two layers in Table 3, the antenna ports for these two layers are always fixed at 7 and 8, and the scrambling ID is always fixed at 0. It can be seen that there is only one layer allocated to transmit a signal, the antenna port number for this is 8, and the scrambling ID (n _SCID ) is 0.

Accordingly, the UE 120-1 not only extracts its own DM-RS using the reference signal information 230 but also other UE (s) connected to the MU-MIMO and using the same resource region without performing a blind search. DM-SR configuration information such as an antenna port number and a scrambling ID for a layer allocated to transmit a reference signal can be obtained.

For another example, the reference signal information 230 is configured as a reference signal of a specific UE, such as the number of layers allocated to transmit a reference signal to a specific UE as shown in Table 4, an antenna port and a scrambling ID ( n _SCID ) for the layer, and the like. Information and the total number of layers allocated by the eNB 110 to transmit a reference signal in a specific resource region, which is connected to MU-MIMO and allocated to transmit a reference signal to other UE (s) using the same resource region. Reference signal configuration information of another UE such as an antenna port and a scrambling ID ( n _SCID ) for the layer may be included. In Table 4, the table on the left is for using one codeword (CW), and the table on the right is for using two codewords (CW).

One codeword:
Codeword 0 enabled,
Codeword 1 disabled Two codewords:
Codeword 0 enabled,
Codeword 1 enabled Value Message Value Message 0 1 layer, port 7, n _SCID = 0, L _total = 1 0 2 layers, ports 7-8, n _SCID = 0, L _total = 2 One 1 layer, port 7, n _SCID = 0, L _total = 2
Other layer: Port 7 and n _SCID = 1 One 2 layers, ports 7-8, n _SCID = 0, L _total = 3
Other layer: Port 7 n _SCID = 1 2 1 layer, port 7, n _SCID = 0, L _total = 2
Other layer: Port 8 and n _SCID = 0 2 2 layers, ports 7-8, n _SCID = 0, L _total = 3
Other layer: Port 8 3 1 layer, port 7, n _SCID = 0, L _total = 2
Other layer: Port 8 and n _SCID = 1 3 2 layers, ports 7-8, n _SCID = 0, L _total = 4 4 1 layer, port 7, n _SCID = 0, L _total = 3
Other layers: Port 7 and 8 with n _SCID = 1 4 2 layers, ports 7-8, n _SCID = 1, L _total = 2 5 1 layer, port 7, n _SCID = 0, L _total = 3
Other layers: Port 8 with n _SCID = 0
           Port 7 with n _SCID = 1 5 2 layers, ports 7-8, n _SCID = 1, L _total = 3
Other layer: Port 7 6 1 layer, port 7, n _SCID = 0, L _total = 3
Other layers: Port 8 with n _SCID = 0
           Port 8 with n _SCID = 1 6 2 layers, ports 7-8, n _SCID = 1, L _total = 3
Other layer: Port 8 7 1 layer, port 7, n _SCID = 0, L _total = 4 7 2 layers, ports 7-8, n _SCID = 1, L _total = 4 8 1 layer, port 7, n _SCID = 1, L _total = 1 8 3 layers, ports 7-9 9 1 layer, port 7, n _SCID = 1, L _total = 2
Other layer: Port 7 and n _SCID = 0 9 4 layers, ports 7-10 10 1 layer, port 7, n _SCID = 1, L _total = 2
Other layer: Port 8 and n _SCID = 0 10 5 layers, ports 7-11 11 1 layer, port 7, n _SCID = 1, L _total = 2
Other layer: Port 8 and n _SCID = 1 11 6 layers, ports 7-12 12 1 layer, port 7, n _SCID = 1, L _total = 3
Other layers: Port 7 with n _SCID = 0
           Port 8 with n _SCID = 0 12 7 layers, ports 7-13 13 1 layer, port 7, n _SCID = 1, L _total = 3
Other layers: Port 7 with n _SCID = 0
           Port 8 with n _SCID = 1 13 8 layers, ports 7-14 14 1 layer, port 7, n _SCID = 1, L _total = 3
Other layers: Port 8 with n _SCID = 0
           Port 8 with n _SCID = 1 14
Reserved 15 1 layer, port 7, n _SCID = 1, L _total = 4 15 Reserved 16 1 layer, port 8, n _SCID = 0, L _total = 1 16 Reserved 17 1 layer, port 8, n _SCID = 0, L _total = 2
Other layer: Port 7 and n _SCID = 0 17 Reserved 18 1 layer, port 8, n _SCID = 0, L _total = 2
Other layer: Port 7 and n _SCID = 1 18 Reserved 19 1 layer, port 8, n _SCID = 0, L _total = 2
Other layer: Port 8 and n _SCID = 1 19 Reserved 20 1 layer, port 8, n _SCID = 0, L _total = 3
Other layers: Port 7 with n _SCID = 0
            Port 7 with n _SCID = 1 20 Reserved 21 1 layer, port 8, n _SCID = 0, L _total = 3
Other layers: Port 7 with n _SCID = 0
            Port 8 with n _SCID = 1 21 Reserved 22 1 layer, port 8, n _SCID = 0, L _total = 3
Other layers: Port 7 with n _SCID = 1
            Port 8 with n _SCID = 1 22 Reserved 23 1 layer, port 8, n _SCID = 1, L _total = 1 23 Reserved 24 1 layer, port 8, n _SCID = 1, L _total = 2
Other layer: Port 7 and n _SCID = 0 24 Reserved 25 1 layer, port 8, n _SCID = 1, L _total = 2
Other layer: Port 7 and n _SCID = 1 25 Reserved 26 1 layer, port 8, n _SCID = 1, L _total = 2
Other layer: Port 8 and n _SCID = 0 26 Reserved 27 1 layer, port 8, n _SCID = 1, L _total = 3
Other layers: Port 7 with n _SCID = 0
            Port 7 with n _SCID = 1 27 Reserved 28 1 layer, port 8, n _SCID = 1, L _total = 3
Other layers: Port 7 with n _SCID = 0
            Port 8 with n _SCID = 0 28 Reserved 29 1 layer, port 8, n _SCID = 1, L _total = 3
Other layers: Port 7 with n _SCID = 1
            Port 8 with n _SCID = 0 29 Reserved 30 2 layers, ports 7-8 30 Reserved 31 3 layers, ports 7-9 31 Reserved 32 4 layers, ports 7-10 32 Reserved 33-63 Reserved 33-63 Reserved

As shown in Table 4, the reference signal information 230 includes reference signal configuration information of a specific UE, such as the number of layers allocated to transmit the reference signal to a specific UE, an antenna port and a scrambling ID ( n _SCID ) for the layer, and an eNB. For the layer allocated for transmitting the reference signal to other UE (s) connected with MU-MIMO together with the total number of layers allocated for transmitting the reference signal in a specific resource region using the same resource region. Reference signal configuration information of another UE such as an antenna port and a scrambling ID ( n _SCID ) is included. In Table 4, since the total number of branches for expressing this is 33, the number of indexes indicating them is 33 in total.

Therefore, in the case of configuring the reference signal information 230 as shown in Table 4 to represent a maximum of 33 indices, the reference signal information 230 is not used and thus 64 indexes including reserved indexes are reserved. Which can be represented using 6 bits.

For example, when the reference signal information 230 includes the index "5", the specific UE that has received the reference signal information 230 has one layer allocated to itself for transmission of the reference signal, and this one It can be seen that the antenna port number for the layer is 7 and the scrambling ID (n _SCID ) is 0. In addition, at this time, the total number of layers allocated by the eNB 110 to transmit a reference signal in a specific resource region is three, and the specific UE 120-1 operates in the MU-MIMO mode to other UEs except its own. The number of layers allocated for transmitting the reference signal is two, and the antenna port number for these two layers is 8 and the scrambling ID (n _scid ) is 0 and 1.

As such, since the reference signal information 230 includes not only reference signal configuration information of a specific UE, but also the total number of layers allocated by the eNB 110 to transmit a reference signal in a specific resource region, control of the DCI format shown in FIG. The specific UE, for example, one UE 120-1 that has received the information, compares the total number of layers with the number of layers of the reference signal information 230. -You can check whether it is in MIMO mode or MU-MIMO mode. In addition, when the UE 120-1 is in the MU-MIMO mode, the UE 120-1 may also know reference signal configuration information of other UE (s) sharing resources with itself.

In more detail, if the total number of layers allocated by the eNB 110 for transmitting a reference signal in a specific resource region is greater than the number of layers allocated for transmitting a reference signal to a specific UE 120-1, the UE 120- It can be seen that 1) is in MU-MIMO mode. Also, without performing a blind decoding or a blind search, the UE 120-1 can know how many layers are allocated to transmit a reference signal to other UE (s) connected to MU-MIMO using the same resource region. The antenna port and scrambling ID for this layer are also known exactly. In other words, it is possible to know exactly the DM-RS information allocated for other UE (s) besides itself which may act as interference.

For example, when eNB 110 simultaneously allocates two UEs to the same time-frequency resource in MU-MIMO mode, antenna port numbers for DM-RS transmission of one UE are 7 and 8, and both are scrambling. If the ID n _SCID is 0, the antenna port number for DM-RS transmission of another UE is 7, and the scrambling ID n _SCID is 1, the eNB 110 transmits a reference signal in a specific resource region. The total number of assigned layers is three.

In this case, when the reference signal information 230 is configured from Table 2, the eNB 110 includes an index "1" in the reference signal information 230 of the control information 200 of FIG. The reference signal information 230 of the control information 200 of FIG. 2 may include an index "6".

On the other hand, when configuring the reference signal information 230 from Table 4, the eNB 110 includes the index "1" in the reference signal information 230 of the control information 200 of FIG. The reference signal information 230 of the control information 200 of FIG. 2 may include an index "12".

The total number of layers allocated by the eNB 110 through the reference signal information 230 to transmit the reference signal in a specific resource region, and other UEs connected to the MU-MIMO and using the same resource region in addition to itself are referred to. The UE 120-1 may perform interference cancellation during MU-MIMO operation by using an antenna port and a scrambling ID for a layer allocated to transmit a signal.

Referring back to FIG. 1, for example, a particular UE 120-1 of the UEs 120-1,..., 120-n included in the wireless communication system 100 is shown in FIG. 2 from the eNB 110. The control information 200 of the DCI format may be received. The specific UE 120-1 may know what resource of the CC is allocated to the eNB 110 through the CC ID 210 and the resource allocation information 220 included in the control information 200. . In addition, the UE 120-1 may be connected to the MU-MIMO together with its reference signal configuration information through the reference signal information 230 included in the control information 200, and may be connected to other UE (s) using the same resource region. Reference signal configuration information can also be known.

In this case, the eNB 110 and the UEs 120-1,..., 120-n respectively store at least one or more of Tables 2 to 4 to configure reference signal configuration information using the control information 200 or reference signal configuration information. The reference signal configuration information corresponding to the index for the reference signal configuration information can be known from either Table 2 alone or Table 4 or Table 4 interworking with Table 3 when the data is extracted.

The eNB 110 transmits control signals 130-1, ..., 130-n, and transmits reference signals and data 140-1, ..., 140-n to the UEs 120-1, ..., 120-n. ) Can be sent.

3 is a diagram illustrating a structure of a transmitter for transmitting a reference signal in a MIMO environment according to an embodiment of the present invention.

Referring to FIG. 3, the transmitter 300 includes a reference signal (RS) sequence generator 310 and a resource element (RE) mapper 320. The transmitter 300 may be an eNB or a base station apparatus 110 shown in FIG. 1. In this case, the reference signal sequence generator 310 and the RE mapper 320 may be implemented by hardware or software integration.

The transmitter 300 in FIG. 3 may transmit through v layers. The reference signal sequence generator 310 receives external information such as a scrambling identity (ID) known from the system information related to the reference signal sequence generation and the reference signal information 230, for example, a DM-RS Create a sequence. At this time, the reference signal information 230 may be configured through one of Table 2 or Table 2 or Table 4 linked with Table 3. The system information related to the generation of the reference signal sequence may include a cell ID, a slot number, the number of maximum resource blocks (RBs) used for downlink, a type of a cyclic prefix (CP), and the like. .

에서, 참조신호 시퀀스 생성부(310)를 통해 생성되는 참조신호 시퀀스

는 수학식 1로 정의될 수 있다.For example, antenna ports

In the reference signal sequence generated by the reference signal sequence generator 310

May be defined by Equation 1.

[Equation 1]

은 하향링크를 위해 사용되는 최대 자원블록 (Resoruce Block; RB)의 개수 의미하며, 의사 랜덤 시퀀스(pseudo-random sequence)

는 31단의 LFSR(Linear Feedback Shift Resistor)로부터 기반한 골드 시퀀스(Gold sequence)로부터 정의될 수 있다. m은 참조신호 시퀀스 생성부(310)로부터 생성되는 참조신호 시퀀스의 인덱스 값으로서 CP(cyclic prefix)의 형태(type), 즉 일반(normal) CP인지 확장된(extended) CP인지에 따라 그 최대 값이 달리 정의될 수 있다.In Equation 1

Is the maximum number of resource blocks used for downlink (RB), pseudo-random sequence (pseudo-random sequence)

May be defined from a gold sequence based on a 31 stage linear feedback shift resistor (LFSR). m is an index value of the reference signal sequence generated from the reference signal sequence generator 310 and is a maximum value depending on the type of CP (ie, normal CP or extended CP). This may be defined differently.

을 초기화한다. 여기서 n_s는 서브프레임 내 슬롯 넘버이며,

는 물리적인 셀 ID이다. 안테나 포트 7과 8에 대해 스크램블링 아이디(

)는 아래 표 5에서와 같이 0 또는 1이며, 안테나 포트들 9 내지 14에 대해서 스크램블링 아이디(

)는 0일 수 있다. 하기 표 5는 DCI 포맷(200)의 스크램블링 아이디필드를 도시한 것이다. 이때, eNB(110)가 참조신호 시퀀스의 생성시 이용하는 스크램블링 아이디는 전술한 바와 같이 참조신호정보(230)에 포함되어 UE에게 전송된다.The reference signal sequence generator 310 is an initial value of a gold sequence based on 31 LFSRs in each subframe.

. Where n _s is the slot number in the subframe,

Is the physical cell ID. The scrambling ID for antenna ports 7 and 8

) Is 0 or 1 as shown in Table 5 below, and the scrambling ID (

) May be zero. Table 5 below shows the scrambling ID field of the DCI format 200. At this time, the scrambling ID used by the eNB 110 when generating the reference signal sequence is included in the reference signal information 230 and transmitted to the UE as described above.

The resource element (RE) mapper 320 knows from the system information and the reference signal information 230 related to mapping the reference signal sequence generated through the reference signal sequence generator 310 to the resource element RE. A reference signal sequence generated by receiving external information such as antenna port information, for example, a DM-RS sequence, is allocated to a time-frequency resource region. Thereafter, data symbols mapped to resource elements (REs) and reference signals such as DM-RS are generated as OFDM signals and transmitted to each UE through an eNB.

In other words, data symbols mapped to resource elements (REs) and reference signals such as DM-RSs may be transmitted to a plurality of UEs through Nt transmit antennas through IFFT and CP (cyclic prefix) insertion, respectively. In this case, a total of v layers may be allocated to n UEs, where n UEs 120-1,..., 120n share the same time / frequency resource region at the same time.

를 도시하고 있고, 도 5는 본 발명이 적용되는 안테나 포트들 7 및 8에 대한 확장된(extended) CP에 대한 DM-RS에 사용되는 자원요소

를 도시하고 있다. 4 is a resource element used for DM-RS for normal CP for antenna ports 7 to 10 to which the present invention is applied;

5 shows resource elements used for DM-RS for an extended CP for antenna ports 7 and 8 to which the present invention is applied.

It is shown.

In the case of a normal CP, up to eight antenna ports (antenna ports 7 to 14) may be used, and antenna ports 7, 8, 11, and 13 are mapped to the same resource region as antenna port 7. Orthogonal sequences such as orthogonal cover codes (OCCs). In addition, antenna ports 9, 10, 12, and 14 are mapped to a resource region such as antenna port 9, and are divided into orthogonal sequences such as orthogonal cover codes (OCCs). The OCC may be configured differently according to each antenna port as shown in Table 6 below.

Therefore, when the antenna port is known, the resource region to which the automatically generated RS sequence is mapped and the orthogonal sequence used by Table 6 can be known. At this time, the antenna port used by the eNB 110 when generating the reference signal sequence is included in the reference signal information 230 and transmitted to the UE as described above.

에 대해, PDSCH 전송에 대응하여 할당된 주파수 도메인 인덱스

를 갖는 물리적 자원블럭(RB)에서 수학식 1에서와 같이 생성된 참조신호 시퀀스 r(m)의 일부분을 도 4에 도시한 바와 같이 복소 변조심볼(complex-valued modulation symbols)

(안테나 포트 p에 대한 자원요소 (k,l)의 값)에 매핑할 수 있다. 또한 확장된(extended) CP에서 자원요소(RE) 매퍼(320)는 안테나 포트들 7 및 8에 대해, PDSCH 전송에 대응하여 할당된 주파수 도메인 인덱스

를 갖는 물리적 자원블럭(RB)에서 수학식 1에서와 같이 생성된 참조신호 시퀀스 r(m)의 일부분을 도 5에 도시한 바와 같이 복소 변조심볼

에 매핑할 수 있다. 이때 확장된(extended) CP에서 참조신호인 DM-RS는 안테나 포트 9 내지 14에 대해 지원되지 않을 수 있다. For example, in a normal CP, the RE element mapper 320 may have antenna ports.

Is assigned a frequency domain index corresponding to the PDSCH transmission

As shown in FIG. 4, a portion of the reference signal sequence r ( m ) generated as in Equation 1 in the physical resource block RB having a complex-valued modulation symbols is shown.

(The value of the resource element ( k , l ) for antenna port p ). In the extended CP, the resource element (RE) mapper 320 also assigns, for antenna ports 7 and 8, the frequency domain index assigned in response to PDSCH transmission.

As shown in FIG. 5, a portion of the reference signal sequence r ( m ) generated as in Equation 1 in the physical resource block Rb having

Can be mapped to In this case, DM-RS, which is a reference signal in an extended CP, may not be supported for antenna ports 9 to 14.

Although not shown, the resource element (RE) mapper 330 may allocate not only a reference signal sequence but also control information including data and reference signal information described with reference to FIGS. 2 and 2 to 4 to the time-frequency resource region. have.

6 is a block diagram of a receiving apparatus according to an embodiment of the present invention.

Referring to FIG. 6, in a wireless communication system, the receiver 600 may include a receiver processor 610, a resource element demapper 620, and a reference signal sequence extractor 630. The receiver 600 may be included in one of the UEs 120-1,..., 120-n described with reference to FIG. 1.

The reception processor 610 receives a signal through each antenna of the reception device.

The resource element demapper 620 is described with reference to FIGS. 4 and 5 using system information related to demapping a reference signal sequence from the resource element RE and antenna port information known from the reference signal information 230. The reference signal sequence is de-mapped for each antenna port in the reverse order of the resource element allocation scheme by one of the schemes.

Although not shown, the resource element (RE) demapper 620 may demap not only a reference signal sequence but also control information including data and reference signal information described with reference to FIGS. 2 and 2 to 4.

The reference signal sequence extractor 630 extracts a reference signal sequence using system information related to the generation of the reference signal sequence and a scrambling ID known from the reference signal information 230.

In detail, the reference signal information 230 of the received control information 200 includes the antenna port, the scrambling ID, the number of layers, and the total number of layers, as shown in Table 2, and performs a blind search or the MU-MIMO through Table 3. Since the antenna port and the scrambling ID for the layers allocated to transmit the reference signal to other UE (s) connected to and using the same resource region can be known, the reference signal sequence extractor 630 can receive information from the other UE (s). By eliminating interference and extracting a reference signal sequence, demodulation information for each antenna port may be obtained in a multi-antenna system including a plurality of antennas.

As such, the reference signal information 230 includes the total number of layers allocated by the eNB 110 to transmit the reference signal in a specific resource region as well as the number of layers allocated for transmitting the reference signal to a specific UE. Receiving apparatus 600 receiving the control information of the DCI format shown in FIG. 1 compares the total number of layers of the reference signal information 230 with the number of layers of a specific UE and determines whether it is in SU-MIMO mode or MU-MIMO mode. have. Also, in the MU-MIMO mode, the reference signal sequence extractor 630 of the receiving apparatus 600 connects to the MU-MIMO and transmits the layers allocated for transmitting the reference signal to other UE (s) using the same resource region. You can get the antenna port and the scrambling ID.

Similarly to the reference signal information 230 of the received control information 200 as shown in Table 4, the antenna port and the scrambling ID, the number of layers, and the total number of layers, connected to MU-MIMO and using the same resource region When including the antenna port and the scrambling ID for the layers allocated to transmit the reference signal to the UE (s), the reference signal sequence extractor 630 removes the interference from the other UE (s) and extracts the reference signal sequence In this case, demodulation information for each antenna port may be obtained in a multi-antenna system including a plurality of antennas.

The demodulator not shown may demodulate data from the decoded data symbols using demodulation information for each antenna port obtained by the reference signal sequence extractor 630.

이고, MU-MIMO로 접속되어 같은 자원영역을 사용하는 UE의 수가 N인 경우,

(

는 UE j의 레이어의 수)이다. UE i가 레이어들의 총수

와 자신의 레이어의 수

를 알고 있으므로, UE i는 간섭되는 레이어의 수

를

를 통해 알 수가 있다.For example, the total number of layers allocated by the eNB 110 to transmit a reference signal in a specific resource region is

When the number of UEs connected by MU-MIMO and using the same resource region is N,

(

Is the number of layers of UE j). UE i total number of layers

And the number of own layers

UE i knows the number of interfering layers

To

This can be seen through

Also, the antenna port and the scrambling ID for the allocated layers are transmitted to the UE to perform a blind search or to transmit a reference signal to other UE (s) connected to MU-MIMO using Table 3 or Table 4 and using the same resource region. As can be seen, interference cancellation can be performed.

For example, when the number of transmitting antennas of the eNB 110 is Nt and the receiving antenna is Nr, the UE transmits to the transmission signal X _i transmitted by the transmitting apparatus. The received signal Y received by i may be expressed by Equation 2 below.

&Quot; (2) "

프리코딩 행렬이며, n은 UE i의 노이즈이다. 채널 행렬 H는 참조신호를 통한 채널 추정을 통해 알 수 있고, UE i의 프리코딩 행렬 C_i는 UE i가 eNB에 피드백한 PMI(Precoding Matrix Indicator)에 대응하는 프리코딩 행렬이다.In Equation 2, H is UE NrXNt channel matrix of _i and C _i is UE for i

Precoding matrix, n is UE i is noise. The channel matrix H can be known through channel estimation through a reference signal, and the UE precoding matrix C _i of _i is UE i is a precoding matrix corresponding to the PMI (Precoding Matrix Indicator) fed back to the eNB.

로 표현되는 UE i의 포스트 디코더가 사용하는 프리코딩 행렬

를 알 수 있으므로 수신신호 Y는 아래 수학식 3과 같이 표현될 수 있다. So through H and C _i

UE represented by Precoding matrix used by i's post decoder

Since it can be seen that the received signal Y can be expressed as Equation 3 below.

&Quot; (3) "

UE i may perform interference cancellation by a commonly used minimum mean square error (MMSE) method using Equation 4 below.

&Quot; (4) "

를 알 수 있으므로 수학식 4의 MMSE 방식에 의해 간섭 제거를 수행할 수 있다.In other words, together with the UE i is connected to MU-MIMO and is connected to another UE j (j ≠ i) using the same resource region.

Since it can be seen that the interference cancellation can be performed by the MMSE method of equation (4).

7 is a signal flowchart for transmitting a reference signal according to an embodiment of the present invention.

Referring to FIG. 7, first, the eNB determines reference signal information (S710).

At this time, the reference signal information, along with the reference signal configuration information including the number of layers allocated for transmitting the reference signal to a specific UE, the antenna port and the scrambling ID for the layer, as shown in Table 2, the eNB and the UE-MU- It may include a total number of layers allocated for transmitting a reference signal to other UE (s) connected with MIMO and using the same resource region.

At this time, the MU-MIMO operation is performed according to the total number of layers as shown in Table 3 so that a specific UE can know the antenna port and the scrambling ID for the layers allocated for transmitting a reference signal to other UE (s) without performing a blind search. It is also possible to fix the antenna port and the scrambling ID for each layer used.

In this case, as shown in Table 4, the reference signal information includes reference signal configuration information of a specific UE, such as the number of layers allocated to transmit a reference signal to a specific UE, an antenna port and a scrambling ID for the layer, and a specific resource of the eNB 110. Antenna port and scrambling ID for the layer allocated for transmitting the reference signal to other UE (s) connected to MU-MIMO with the total number of layers allocated for transmitting the reference signal in the region and using the same resource region. It may include reference signal configuration information of another UE of.

As described above, the reference signal includes a cell-specific reference signal (CRS), a UE-specific reference signal (DM-RS), and a channel state information reference signal (Channel State Information-). Reference Signal (CSI-RS), but will be described below using the DM-RS as a reference signal.

Next, the eNB generates control information represented by an index (index or indicator) indicating the reference signal information determined in step S710 from Table 2 and Table 3 or Table 4 stored in advance (S720). In this case, as described with reference to FIG. 2, the control information may include other information, for example, an element carrier identifier (CIF) or resource allocation information.

Next, the eNB transmits downlink control information generated in step S720 to UEs through a physical downlink control channel (PDCCH) (S730).

As described above, a physical downlink control channel (PDCCH) carrying this control information is transmitted in an aggregation of one or more consecutive control channel elements (CCEs), and various PDCCHs as shown in Table 1 below. Format support

The eNB generates a reference signal related to the RS information and transmits it to UEs (S740). Since the process of generating and transmitting the DM-RS has been described with reference to FIGS. 3 to 5, a detailed description thereof will be omitted. In this case, the eNB may transmit data to the UEs together with the reference signal.

8 is a signal flowchart for receiving a reference signal according to an embodiment of the present invention.

Referring to FIG. 8, a specific UE first receives control information including reference signal information represented by an index from an eNB (S810).

Next, the specific terminal, using the pre-stored Table 2, Table 3 or Table 4, the antenna port corresponding to the index representing the reference signal information included in the control information received in step S810 (Antenna port (s)) And reference signal configuration information including a scrambling ID, a number of layers allocated for transmitting a reference signal to the specific UE, and another eNB connected to the corresponding UE and MU-MIMO to use the same resource region. The total number of layers allocated for transmitting the reference signal to the UE (s) is checked (S815).

Next, the specific UE receives a signal through each antenna of the eNB (S820).

Next, the specific UE is connected to the corresponding UE and MU-MIMO, and the total number of layer (s) allocated to transmit the reference signal to other UE (s) using the same resource region transmits the reference signal to the specific UE. It is determined whether the number is greater than the number of layers allocated (S830). In operation S830, the specific UE may know that the former operates in the MU-MIMO mode when the former is larger than the latter, and operates in the SU-MIMO mode when the former and the latter are the same. In this case, step S830 may be performed before step S820.

When the former and the latter are the same in step S830 to operate in the SU-MIMO mode, a specific UE is determined from system information and reference signal information related to demapping the reference signal sequence from the resource element RE of the signal received in step S820. Demapping the reference signal sequence for each antenna port in the reverse order of the resource element allocation method using one of the methods described with reference to FIGS. 4 and 5 using the known antenna port information and the like. A reference signal sequence is extracted using a scrambling ID known from the signal information 230 (S840).

On the other hand, when the former is larger than the latter in step S830, when operating in the MU-MIMO mode, a specific UE is connected to the MU-MIMO and the layers allocated for transmitting a reference signal to other UE (s) using the same resource region The antenna port and the scrambling ID to remove interference from other UE (s) from the received signal, demap the reference signal sequence from the resource element (RE) of the received signal, The scrambling ID (ID), etc., which are known from the reference signal information 230, is used to remove interference from other UE (s) and extract a reference signal sequence (S850).

In this case, a specific UE performs a blind search or is connected to MU-MIMO through Table 3 or Table 4 to transmit antennas and other scrambling IDs for layers allocated to transmit a reference signal to other UE (s) using the same resource region. It can be seen.

를 알 수 있으므로 수학식 4의 MMSE 방식에 의해 간섭 제거를 수행할 수 있다.As described above in step S850, a specific UE may remove interference from other UE (s) from the received signal and extract a reference signal sequence by using the MMSE method using Equation 3 to Equation 4, but is not limited thereto. . In other words, a specific UE is connected to MU-MIMO and the antenna port and scrambling ID for the allocated layers for transmitting reference signals to other UEs using the same resource region are represented by

Since it can be seen that the interference cancellation can be performed by the MMSE method of equation (4).

Next, a specific UE obtains demodulation information for each antenna port in a multi-antenna system including a plurality of antennas through a reference signal sequence extracted by one of steps S840 and S850 (S860). The specific UE may demodulate data from the decoded data symbol using demodulation information for each antenna port obtained in step S860.

In the above-described embodiments, when the eNB 110 transmits a reference signal such as DM-RS to the UE (s) in a downlink MIMO environment, the number of layers and the layers used for transmitting the reference signal to a specific UE are determined. Antenna port and scrambling ID, and the total number of layers allocated to transmit a reference signal to a UE or UEs using the same resource region, including a specific UE in SU-MIMO or MU-MIMO, If there are other UEs using the same resource region other than the UE, the downlink of the PDCCH DCI format carries reference signal configuration information including at least some of an antenna port and a scrambling ID for layers allocated for transmitting the reference signal to the UEs. Disclosed are a method and apparatus for signaling in control information, a method for receiving the control information, and an apparatus thereof.

In the above-described embodiments, when the reference signal is decoded in a specific terminal (UE) in MU-MIMO, the interference is detected by the other terminal (UE), thereby eliminating the interference, thereby improving the operation performance in the MU-MIMO mode. have.

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 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 (27)

In a method for transmitting a reference signal of a base station in a wireless communication system,
Generating and transmitting a reference signal for a specific terminal; And
In transmitting the reference signal to the specific terminal, the number of layers allocated, the antenna port and the scrambling ID for the layer, and the reference terminal to transmit the reference signal to the terminal using the same resource region, including the specific terminal And transmitting reference signal information indicating the total number of all allocated layers. The method of claim 1, wherein the reference signal information,
And all or part of configuration information of a reference signal for another terminal using the same resource region as the specific terminal. The method of claim 2, wherein the reference signal information for the other terminal (s),
The reference signal transmission method, characterized in that the antenna port and the scrambling ID for the assigned layer in transmitting the reference signal to the other terminal. The method of claim 1,
The reference signal is characterized in that the antenna port number and the scrambling ID used for the layer allocated in transmitting the reference signal is a fixed antenna port number and a scrambling ID for each layer according to the total number of the allocated layers. Transmission method. The method of claim 1, wherein the reference signal,
Reference signal transmission method, characterized in that the DM-RS (Demodulation Reference Signal). The method of claim 1, wherein the reference signal information,
Reference signal transmission method comprising the control information is transmitted through a control channel. In a method for receiving a reference signal of a terminal in a wireless communication system,
In transmitting the reference signal from the base station to the specific terminal, the number of layers allocated, the antenna port and scrambling ID for the layer, and the reference signal to terminals using the same resource region including the specific terminal or the specific terminal. Receiving reference signal information indicative of the total number of all layers allocated in the transmission;
Receiving a reference signal from the base station; And
And extracting the reference signal sequence by using the reference signal information. The method of claim 7, wherein the reference signal information,
The reference signal receiving method, characterized in that it further comprises all or part of the reference signal configuration information for the other terminal using the same resource region as the specific terminal. The method of claim 8, wherein the reference signal information for the other terminal,
Reference signal reception method, characterized in that the antenna port and the scrambling ID for the assigned layer in transmitting the reference signal to the other terminal. The method of claim 7, wherein
The antenna port number and the scrambling ID used for the layer allocated to the transmitted reference signal are the antenna port number and the scrambling ID fixed for each layer according to the total number of the assigned layers. Way. The method of claim 7, wherein the reference signal,
Reference signal reception method, characterized in that the DM-RS (Demodulation Reference Signal). The method of claim 7, wherein the reference signal information,
Included in the control information, characterized in that received over the control channel. In the transmitter for transmitting a reference signal in a wireless communication system,
A reference signal sequence generator for generating a reference signal sequence; And
A terminal using the same resource region including the generated reference signal sequence and the number of layers allocated for transmitting the reference signal to the specific terminal, the antenna port and the scrambling ID for the layer, and the specific terminal or the specific terminal. And a resource element mapper for allocating the reference signal information time-frequency resource region indicating the total number of all layers allocated for transmitting the reference signal. The method of claim 13, wherein the reference signal information,
And all or part of configuration information of a reference signal for another terminal using the same resource region as the specific terminal. The method of claim 14, wherein the reference signal information for the other terminal (s),
And an antenna port and a scrambling ID for the assigned layer in transmitting the reference signal to the other terminal. The method of claim 13,
The reference signal is characterized in that the antenna port number and the scrambling ID used for the layer allocated in transmitting the reference signal is a fixed antenna port number and a scrambling ID for each layer according to the total number of the assigned layers. Transmitter. The method of claim 13, wherein the reference signal,
Reference signal transmission apparatus characterized in that the DM-RS (Demodulation Reference Signal). The method of claim 13, wherein the reference signal information,
Reference signal transmission apparatus, characterized in that included in the control information received via the control channel. The method of claim 17, wherein the transmitting device,
Reference signal transmitter, characterized in that the base station. In the receiving device for receiving a reference signal in a wireless communication system,
Receiving processing unit for receiving a signal;
The same resource including the reference signal sequence from the resource element of the received signal and the number of layers allocated for transmitting a reference signal to a specific terminal, an antenna port and scrambling ID for the layer, and the specific terminal or the specific terminal. A resource element demapper for demapping reference signal information indicating the total number of all allocated layers in transmitting a reference signal to a terminal using an area; And
And a reference signal sequence extracting unit for extracting a reference signal sequence using the reference signal information. The method of claim 20, wherein the reference signal information,
And all or part of reference signal configuration information for another terminal using the same resource region as the specific terminal. The method of claim 21, wherein the reference signal information for the other terminal,
The reference signal receiving apparatus, characterized in that the antenna port and the scrambling ID for the assigned layer in transmitting the reference signal to the other terminal. 21. The method of claim 20,
The antenna port number and the scrambling ID used for the layer allocated to the transmitted reference signal are the antenna port number and the scrambling ID fixed for each layer according to the total number of the assigned layers. Device. The method of claim 20, wherein the reference signal,
Reference signal receiver, characterized in that the DM-RS (Demodulation Reference Signal). The method of claim 20, wherein the reference signal information,
Reference signal receiving apparatus, characterized in that included in the control information received via the control channel. The method of claim 24, wherein the receiving device,
Reference signal receiving apparatus, characterized in that the terminal. In the method for transmitting and receiving a reference signal in a wireless communication system,
The total number of all layers allocated by the base station for other terminals using the same resource region, including the number of different layers, the antenna port and the scrambling ID ( n _SCID ), and the specific terminal for the layer, corresponding to the set number of codewords. Transmitting an index indicating a to the terminal;
The terminal receives the index from the base station, checks the number of allocated layers, the antenna port and the scrambling ID ( n _SCID ) for the layer, and is allocated to other terminals based on the total number of all the allocated layers. And receiving a reference signal by removing the interference by checking the number of layers, the antenna port and the scrambling ID ( n _SCID ) for the layers allocated to the other terminals, and receiving the reference signal.

Images