WO2019050367A1

WO2019050367A1 - Method and device for transmitting or receiving reference signal in wireless communication system

Info

Publication number: WO2019050367A1
Application number: PCT/KR2018/010567
Authority: WO
Inventors: 김규석; 김형태; 박종현; 이길봄; 강지원
Original assignee: 엘지전자 주식회사
Priority date: 2017-09-08
Filing date: 2018-09-10
Publication date: 2019-03-14

Abstract

The present invention relates to a method and device for operating a terminal in a wireless communication system. According to the present invention, downlink control information (DCI) is received from a base station, wherein the downlink control information includes at least one among resource information related to a resource through which a first reference signal is transmitted, port combination information related to a combination of at least one antenna port through which a second reference signal is transmitted, and quasi co-location (QCU) information between a channel through which the first reference signal is transmitted and a channel through which the second reference signal is transmitted. The present invention may provide a method and device, in which a terminal receives the second reference signal through the at least one antenna port on the basis of the DCI, wherein the at least one antenna port is included in a specific antenna port group on the basis of the resource information, and the specific antenna port group includes antenna ports multiplexed through an identical multiplexing scheme.

Description

【Specification】

Title of the Invention

Method and apparatus for transmitting and receiving reference signals in a wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for generating and transmitting a demodulation reference signal (DMRS) for demodulating data in a wireless communication system. ᅳ

TECHNICAL BACKGROUND OF THE INVENTION

. The mobile communication system has been developed to provide voice service while guaranteeing user 's activity. However, the mobile communication system has been extended to the area to not only voice data services, currently has caused a shortage of resources due to an increase in explosive traffic and users more because it requires a high-speed services and more advanced ^{moves, "the} new system is required have.

Requirements of next generation mobile communication system ¾ gun is larger explosive of receiving data traffic, the breakthrough of ^vapor-tone transmissions per user, greatly increasing the acceptance of the connection device number, very low end-to-end delay (End- to-End Latency), high energy efficiency Should be able to support. Hin - da. . To this end a double integrity ^(Dua l Connectivity), a large de-julryeok of the mouth (Massive MIMO .: Massive Multiple Input Multiple Output), a full-duplex (In-band Full Duplex), non-orthogonal to the ^first connection (NOMA:. On- Orthogonal Multiple Access, Super wideband support, and Device Networking.

DISCLOSURE OF THE INVENTION

[Problem to be solved]

It is an object of the present invention to provide a method for generating and transmitting a demodulation reference signal (DMRS) used for demodulating data. It is another object of the present invention to provide a method for setting up antenna ports of a DMRS in which different QCL conditions are satisfied when a terminal receives a reference signal from a plurality of base stations.

In addition, the present invention aims to provide a method for ^setting different QCLs between antenna ports for transmission of DMRS in which antenna ports are included in different groups.

It is another object of the present invention to provide a method for setting different QCL conditions between antenna ports for transmitting a reference signal in each base station when a reference signal is transmitted from a plurality of base stations.

Disclosed herein it comes not limited in the above with reference hinge ^■ technical problem, not mentioned another technical problem will be apparent to those of ordinary skill in the art from the following description It can be understood.

[Solving the problem] -

According to an aspect of the present invention, there is provided a method of operating a terminal in a wireless communication system, including downlink control information

Control information: DCI), the downlink control information being related to a resource to which the first reference signal is transmitted. And the port combination information corresponding to the combination of at least one antenna port through which the second reference signal is transmitted or the QCL Quas i Co-Locat between the channel through which the first reference signal is transmitted and the channel through which the second reference signal is transmitted ion) information; And receiving the second reference signal through the at least one antenna port based on the DCI, wherein the at least one antenna port is included in a specific antenna port group based on the resource information, A specific indeterminate port group is a group of antenna ports that are multiplexed through the same multiplexing scheme.

In addition, in the present invention, the antenna ports included in the specific antenna port group are QCL (Quasi Co-Locate) systems.

Further, in the present invention, the at least one antenna port may be included in the QCL information Is mapped to a specific resource element (Resource El- ment: RE)

The combination of the one antenna port is different according to the QCL information.

Also, in the present invention, the reference symbol is transmitted from a plurality of base stations, and the source resource information indicates the number of resources allocated from each of the plurality of base stations.

Further, in the present invention, the at least one antenna port is configured based on a combination of antenna sets included in the specific antenna port group.

In addition, in the present invention, when mapping the pressure ports to at least one of the layers corresponding to a specific codeword, the combination of the at least one antenna port may be applied to the specific antenna port of one or more pressure port groups Included in the group. Antenna port to the first and ¾ sheet, is composed of the one or more antenna ports, each such group ^ ¾ antenna port to be multiplexed through a multiplexing room _¾:

_. ^ One _. In the present invention, the sum of the single-antenna antennas is made up of antenna ports selected by the base station from the one or more antenna ports, and the DCI is used for each of the selected antenna ports The DCI further includes muting information related to whether or not a resource element occupied by an antenna port group that is not allocated to the UE is muting.

Also, in the present invention, the DCI is defined by the number of antenna ports and the number of at least one antenna port _. Symbol information related to the number of symbols to which the second punctuation symbol is mapped and / or at least one of the least significant information symbols related to the number of layers to which the at least one antenna port is mapped.

The present invention also relates to a method for transmitting downlink control information (DCI) to a terminal. The sinking downlink control information includes resource information related to a first reference signaling resource to be transmitted, port combination information related to a combination of at least one antenna port through which a reference signal is transmitted, The QCUQuasi co-locator between the transmitted channel and the channel to which the second reference signal is transmitted) Information; And transmitting the second reference signal to the terminal via the at least one antenna port based on the DCI, wherein at least one of the antenna ports is included in a specific antenna port group based on the resource information And the specific antenna port group provides an operation method of a base station including antenna ports multiplexed through the same multiplexing scheme. Further, the present invention may further comprise: mapping a plurality of specific codes and complex-valued variable symbols for transmitting the second reference signal to a plurality of layers (l ayer); And mapping the plurality of layers to at least one antenna port of the sinker.

Also, in the present invention, the combination of the at least one antenna port is composed of antenna ports included in a group of different antenna ports of the one or more antenna port groups, and the antenna ports are grouped into a specific codeword Wherein the combination of the at least one antenna port is prioritized by antenna ports included in the specific antenna port group of one or more antenna port groups, and the one or more An antenna port group is composed of antenna ports that are multiplexed through the same multiplexing method.

. According to another aspect of the present invention, there is provided a communication apparatus comprising: a communication unit for transmitting and receiving a radio signal with the outside; And a processor operatively coupled to the communication unit, wherein the processor receives downlink control information (DCI) from a base station, wherein the downlink control information includes a first reference signal, The port number combination information related to the combination of the at least one antenna port through which the second reference signal is transmitted or the channel combination between the channel to which the first reference signal is transmitted and the QCUQuas i Co-Location) information based on the DCI, and receives the second reference signal through the at least one antenna port based on the DCI, Antenna port group, and the specific antenna port group is multiplexed through the same multiplexing scheme And an antenna port. 【Effects of the Invention】

The present invention can reduce the payload size of downlink control information by selecting a combination of specific antenna ports according to QCL information transmitted from a base station by setting a combination of a plurality of antenna ports at one station .

In addition, when the terminal receives a reference signal from a plurality of base stations, the terminal selects and maps a combination of antenna ports included in an antenna group having different QCL conditions, thereby enabling QCL conditions to be set differently -. In addition, the present invention has an effect of setting different QCL conditions by mapping layers mapped to different specific codes to antennas included in an antenna port group having different QCL conditions.

The effects obtainable in this specification are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art to which the present invention belongs I would be able to.

_: Brief Description of Drawings

Helping to understand the present invention. The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the technical features of the invention.

Fig _. The structure of a wireless frame in a wireless communication system to which the invention may be applied. ^. Drawing Illustrations -.

. Fig. (Resource gr i d) for one downlink slot in a wireless communication system to which the present invention can be applied.

3 is a diagram illustrating a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

4 is a diagram illustrating a structure of a UL subframe in a wireless communication system to which the present invention can be applied.

5 illustrates PUCCH formats in an uplink in a wireless communication system in which the present invention can be addressed. FIG. 6 is a diagram illustrating an example of a form mapped to a PUCCH region of a physical resource block; FIG. 6 is a diagram illustrating an example of a signal processing process of an uplink shared channel, which is a transmission channel (channel) in a wireless communication system to which the present invention can be applied. FIG. 7 shows an example of a subframe-based subframe structure to which the method proposed herein can be applied.

8 to 10 are diagrams showing an example of a method of DMRS application to which the present invention can be applied.

11 is a diagram showing an example of a method for receiving a demodulation reference signal by a terminal proposed in the present specification.

12 is a diagram showing an example of a method for transmitting a demodulation reference signal by a base station proposed in the present specification.

13 and 14 are diagrams showing an example of a method of mapping an antenna port proposed in this specification to a resource element (RE).

15 is a diagram illustrating an example of a method of setting antenna ports to which the present invention can be applied.

16 and 17 are diagrams illustrating an example in which data is transmitted from a base station to which the present invention can be applied.

FIG. 18 is a diagram illustrating an example of a method of mapping between an antenna port and a resource element proposed in this specification; FIG.

_: Figure 19 is a diagram showing an example of the setting ice method of the sanitary-ports proposed in the present specification.

20 is a diagram showing an example of a method for mapping a layer proposed in this specification to an antenna port.

FIG. 21 is a diagram showing an example of a layer-to-port mapping method proposed in the present specification.

22 is a diagram illustrating an example of a method of defining a table of reference signals according to a mapping method of a blurred signal according to the present invention.

Fig. FIG. 1 is a diagram illustrating an example of an internal block diagram of a wireless device to which the present invention can be applied.

≡. 24 is a block diagram illustrating a block diagram of a communication apparatus according to an embodiment of the present invention; 25 is a diagram illustrating an example of RF mosques of a wireless communication device to which the method proposed in this specification can be applied.

26 is a diagram illustrating another example of the RF models of a wireless communication apparatus to which the method proposed herein can be applied.

DETAILED DESCRIPTION OF THE INVENTION

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. Thus, those skilled in the art will appreciate that the present invention may be practiced without these specific details.

In some cases, well-known structures and devices are omitted to avoid obscuring the concept of the present invention. - can be shown in block diagram form centering on the core functions of each structure and device. . In this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The particular operation described herein as performed by the base station may also be performed by an upper node of the base station, as the case may be _. have. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A base station (BS) can be replaced by terms such as a fixed station, a Node 13, an evolved NodeB (eNB), a BTSC base transceiver system, an access point (AP) have. Also, a 'terminal' may be fixed or mobile and may be a UE Jser Equipment, a MS (Mobile Station), a UKuser. terminal, an MSS subscriber station, an SS subscriber station, an AMS (Advanced Mobile Station), a WT (wireless terminal), a MTC (Machine-Type Cpmmunication) Machine, D2D (device-to-device), receiving end, TRPCtransmission reception point). Hereinafter, a downlink (DL) means a communication from a base station to a terminal, and an uplink (UL) means a communication from a terminal to a base station. In the downlink, the transmitter is part of the base station and the receiver can be part of the terminal. In the uplink, the transmitter may be part of the terminal and the receiver may be part of the base station.

In order to facilitate understanding of the present invention, And the use of such specific terminology may be changed into other forms without departing from the technical spirit of the present invention.

The following ^■ technology CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (t ime division multiple access), 0FDMA (orthogonal frequency division multiple access), SC-FDMA (si ng 1 e carrier frequency division multiple access, N0MA (non-t hogona 1 multiple access), and so on. CDMA can be implemented with radio technology such as UTRAdmiversal terrestrial radio access) or CDMA2000. TDMA can be implemented with wireless technologies such as GSM (Global System for Mobile Communications) / GPRS (Advanced Packet Radio Service) / EDGE (enhanced data rates for GSM evolution). 0FDMA can be implemented with wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMA), IEEE 802-20, and evolved UTRA (E-UTRA). UTRA is part of the UMTS mobile mobile teleco uni cat ions system. 3GPP (3GPP) Long term evolution (LTE) is a part of E_UMTS (evolved UMTS) using E-UTRA, adopting 0FDMA in the downlink and SC-FDMA in the uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by the disclosure documents in at least one of the wireless access systems IEEE 802, 3GPP, and 3GPP2. That is, steps or portions of embodiments of the present invention that are not described in order to clearly illustrate the technical context of the present invention could be supported by the Singing Documentation. Also disclosed herein ^. All the terms that are present may be described by the gazette document.

For clarity, the 3GPP UE / LTE-A is mainly described, but the technical features of the present invention are not limited thereto. A wireless communication system to which the present invention can be applied

1 shows a structure of a radio frame in a wireless communication system to which the present invention can be applied.

In 3GPP LTE / LTE-A, Type 1 (FDD) applicable to Frequency Division Duplex It supports a radio frame structure and a type 2 radio frame structure applicable to TDD (Time Division Duplex).

In FIG. 1, the size of the radio frame in the time domain is represented by a multiple of a time unit of T_s = l / (15000 * 2048). The downlink and uplink transmissions are composed of radio frames having intervals of T- f = 307200 * T_s = 10ms.

1 (a) illustrates the structure of a Type 1 radio frame. Type 1 radio frames can be applied to both full duplex and half duplex FDD.

A radio frame is composed of 1Q sub - frames. One radio frame consists of 20 slots of length T_slot = 15360 * T-s = 0.5ms. Slots are assigned to indexes 0 through 19. One subframe consists of two consecutive slots in the time domain, and the subframe i consists of slots 2i and 2i + l. The time taken to transmit one subframe is called the transmission time interval (TTI). For example, one subframe may have a length of 1 ms and the length of one slot may be 0.5 ms.

In FDD, uplink transmission and downlink transmission are separated in frequency domain. While there is no limit to full-duplex FDD, terminals can not transmit and receive simultaneously in half-duplex FDD operation.

One slot includes a plurality of orthogonal frequency division multiplexing (OFDM) symbols in the time domain, and includes a plurality of resource blocks (RBs) in the frequency domain. 3GPP LTE uses 0FDMA in downlink, so 0FOM symbol is to represent one symbol period. The 0FDM symbol is one SC-FDMA symbol or symbol interval. A resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

1 (b) shows a type 2 frame structure (frame structure type 2).

The Type 2 radio frame consists of two half - frames with a length of 15360Q * T_s = 5ms. Each half frame consists of 5 subframes with a length of 30720 * T_s = lms.

In a Type 2 frame structure of a TDD system, uplink- downlink conf igurat ion is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes.

Table 1 shows the uplink-downlink configuration.

[Table 1]

Referring to Table 1, for each sub-frame of the radio frame, 'D' denotes a ^wihin, subframe to downlink transmission, 'U ¹ denotes a subframe for uplink transmission,' S 'are DwPTS (Down Link Pilot Time Slot), Guard Period (GP), UpPTSCU link Pilot Time Slot), and a special subframe consisting of three fields.

DwPTS is used for the initial ^ t color, synchronization, or channel estimation at the terminal. UpPTS is used to synchronize the channel estimation at the base station and the uplink transmission synchronization of the UE. GP is a period for eliminating the interference caused in the uplink due to the multi-path delay of the downlink signal between the uplink and the downlink.

Each subframe i is composed of a slot 2i and a slot 2i + 1 each having a length of T_slot = L5360 * T_s = Q.5ms.

The uplink sub-frame and the downlink frame can be classified into seven types, and the positions and / or the numbers of the downlink sub-frame, the special sub-frame, and the incomplete link sub-frame are different for each configuration. .

The point of time when the uplink is changed to the uplink in the downlink or the time when the uplink is switched to the downlink is called the switching point. Switching point iodicity means a period in which switching between the uplink subframe and the downlink subframe is repeated in the same manner, 10ms were all supported. When a period of 5 ms downlink-uplink switching point is present, the special subframe S exists for each half-frame, and if there is a period of the downlink-uplink switching point, the special subframe S exists only in the first half-frame. In all configurations, Q, 5, and DwPTS are only for downlink transmission. UpPTS and subframes immediately following a subframe subframe are always intervals for uplink transmission.

The uplink-downlink configuration is system information, and both the base station and the terminal can know it. The base station can inform the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only the index of the configuration information every time the uplink-downlink configuration information is changed. Further, the configuration information is PDCCH, like other scheduling information, a type of a downlink control information (Phys i ca l Downl ink Contro l Channe l) may be transmitted through, over the broadcast channel (broadcast channe l) as a broadcast information ^λ And may be transmitted to all terminals in the network ^.

Table 2 shows the configuration (DwPTS / GP / UpPTS length) of the special subframe.

[Table 2]

The number of subcarriers included in a frame or the number of 0FDM symbols included in a slot of a slot included in a subframe may be variously changed. 2 is a diagram illustrating a resource grid (res.rece grid) for one downlink slot in a wireless communication system to which the present invention can be applied.

Referring to FIG. 2, one downlink slot includes a plurality of OFDM symbols in a time domain. Herein, one downlink slot includes seven OFDM symbols and one resource block includes 12 subcarriers in the frequency domain. However, the present invention is not limited thereto.

Each element on the resource grid is a resource element, and a resource block (RJ3: resource block) contains 12 X 7 resource elements. The number DL of resource blocks included in the downlink slot is dependent on the downlink transmission bandwidth.

The structure of the uplink slot can be the same as the structure of the downlink slot.

3 illustrates a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

_. 3, a maximum of three OFDM symbols preceding a first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions allocated to PDSCH (Physical Downlink Shared Channel) (data region). (PCF.IQK Physical Control Format Indicator Channel), PDCCH (Physical Downlink Control.Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like are examples of a downlink control channel used in 3GPP LTE.

PCFIGH is transmitted in the first QFDM of the subframe, and is controlled in the subframe. Information on the number of QFDM symbols used for transmission of channels (i. E. The size of the control region). PHICH is a channel response for the uplink, _HARQ; carries an ACK (Acknowledgement VNACl Not- Acknowledgement) signal for the (Hybricl Automatic Repeat Request). The control information transmitted through the PDCCH is referred to as downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information, or an uplink transmission (Tx) power control command for an arbitrary terminal group.

The PDCCH is a resource allocation and transmission format of a downlink shared channel (DL-SCH) (this is called a downlink grant), a resource allocation of an uplink shared channel (UL-SCH) Information such as paging information on a paging channel (PCH), system information on a DL-SCH, and a random access response transmitted on a PDSCH (upper layer) resource allocation for a control message, activation of a set of transmission power control commands for individual terminals in an arbitrary terminal group, VoIPCVoice over IP). The plurality of PDCCHs can be transmitted in the control domain, and the UE can monitor a plurality of PDCCHs. The PDCCH consists of a set of consecutive CCEs (contiguous channel elements). The CCE is a logical allocation unit used to provide a coding rate according to the state of the radio channel to the PDCCH. The CCE is multiplied by a plurality of resource element groups. The format of the PDCCH and the number of bits of the available PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.

The base station determines the PDCCH format according to the DCI to be transmitted to the UE, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked by a unique identifier (referred to as RNTKRadio Network Temporary Identifier) according to the owner or use of the PDCCH. If the PDCCH is for a particular UE, the UE's unique identifier, e.g., ORNTI (Cell-RNTI), can be CRM masked. Or a PDCCH for a paging message, a paging indication identifier, for example, a P-RNTI (Paging-RNTI) Can be masked to CRC. System information identifier, SI-RNTI (system information RNTI) can be masked in the CRC if it is a PDCCH for system information, more specifically a system information block (SIB). A random access-RNTI (RA-RNTI) may be masked on the CRC to indicate a random access response to the transmission of the UE's random access preamble.

PDCCH (Physical Downlink Control Channel)

In the following, for the ^PDCCH: The view spread in more detail.

. The control information transmitted through the PDCCH is called a downlink control indicator (DCI). According to the DCI format, the size and usages of control information are different for PDCCH and the size can be changed according to the coding rate. Table 3 shows the DCI according to the DCI format.

[Table 3]

A format 1 for scheduling one PDSCH codeword, a format 1A for compact scheduling of one PDSCH codeword, and a format for very simple scheduling of a DL-SCH _. 1C, Format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, Format 2k for PDSCH scheduling in open loop spatial multiplexing mode, and TPCC Transmission Power Control for uplink channel And format 4 for PUSCH scheduling in one uplink cell in a multi-antenna port transmission mode.

DCI format 1A. Can be used for PDSCH scheduling regardless of which transmission mode is set in the UE.

The DCI format can be independently applied to each UE, and the CHs of the UEs can be simultaneously multiplexed in one subframe. PDCCH. Consists of one or several jiphip ^· (aggregation) of consecutive CCE control channel elements). (CE is a logical allocation unit used to provide the PDCCH with a coding rate according to the state of the radio channel.) The CCE refers to nine sets of REGs consisting of four resource elements S: We can use {1, 2, 4, 8} CCEs to construct a single PDCCH. Signals {1, 2, 4, 8} are called CCE aggregation level.

The number of CCEs used for transmission of the characteristic PDCCH depends on the channel state Is determined by the base station. The PDCCH configured according to the UE-MAP is interleaved to the control channel region of each subframe by the CCE-to-RE mapping rule (CCE-to-RE mapping rule). The location of the PDCCH may depend on the number of symbols, the number of PHICH groups, the transmit antenna, the frequency, and the like for the control channel of each subframe.

As described above, channel coding is independently performed on the PDCCH of each multiplexed terminal, and a cyclic redundancy check (CRC) is applied. The UE can mask its own identifier (UE ID) of each UE by CRC so that the UE can receive its own PDCCH. However, in the control region allocated in the subframe, It does not provide any information about where it is located. Since the UE can not know from which position its CCE aggregation level or DCI format is transmitted in order to receive the control channel transmitted from the BS, the UE monitors the set of PDCCH candidates in the subframe Find your own PDCCH. This is called Blind Decoding (BD).

blind. Decoding can be called Blind Detection or Blind Search. Blind decoding refers to a method in which a UE de-masks its UE ID in a CRC field and then checks CRC errors to determine whether the corresponding PDCCH is its own control channel.

Hereinafter, information transmitted through the DCI format Q will be described.

DCI format. 0 is used to schedule the PUSCH in one uplink sal. Table 4 shows the information transmitted in the DCI format Q.

- Table 4.

Format 0 (Release 8) Format 0 (Release 10)

Carr ier Indicator (CIF)

Flag ¹ for format 0 / format 1A Flag for format 0 / format 1A di ferent ion ation di ferent ion ion

Hop ing f lag (FH) Hopping f lag (FH)

Resource block assignment (RIY) Resource block assignment (RIV)

MCS and RV MCS and RV

NDI (New Data Indicator) NDI (New Data Indicator)

TPC for PUSCH TPC for PUSCH Cyclic shift for DM RS

UL index (TDD only) UL index (TDD only)

Downlink Assignment Index (DAI) Downlink Assignment Index (DAI)

CSI request (1 bit) CSI request (1 or 2 bits: 2 bits is for multi carrier)

SRS request

Resource allocation type (RAT) Referring to Table 4, information transmitted through DCI format 0 is as follows.

1) Carrier indicator - A dither consisting of 0 or 3 bits.

2) Flag for distinguishing DCI format Q from format 1A - 1 bit, 0 value indicates DCI format 0, 1 value indicates DCI format 1A.

3) Frequency hopping flag - It consists of 1 bit. This field can be used for multi-cluster allocation as needed: the most significant bit (MSB) of the resource allocation.

4) Resource block assignment and hopping resource allocation - log ₂ (B ^L (B + 0/2)) bits. Here, in a single-duster allocation, PUSCH hopping , The most significant bits (MSBs) of NIL-hop are used to obtain the value of "<

^■ N ULJiop

Is used. Bit provides resource allocation of the first slot in the uplink subframe. Also, in a single cluster allocation, the PUSCH

If there is no hopping, the bit provides resource allocation in the uplink subframe. If there is no PUSCH hop in a multi-cluster allocation, resource allocation information is obtained from the frequency hopping flag field and concatenation of resource block allocation and hopping fields,

Bit provides resource allocation within the uplink server frame. At this time, the P value is determined by the number of downlink resource blocks.

5) Modulation and coding scheme (MCS) - It consists of 5 bits. 6) New data indicator - consists of 1 bit.

7) TKXTransmit Power Control command for PUSCH - It consists of 2 bits.

8) cyclic shift (CS) for demodulation reference signal (DMRS) and index of orthogonal cover code (0C / 0CC) - 3 bits.

9) Uplink index - consists of 2 bits. This field exists only in the TDD operation according to the UL-DOWN configuration 0.

10) Downlink Assignment Index (DAI) - It is composed of 2 bits. This ^field is a UL-exists only TDD operation according to the downlink configuration (uplink-downlink configuration) 1-6.

11). Request Channel State Information (CSI) - consists of 1 or 2 bits. Here, the 2-bit field is applied only when the corresponding DCI is mapped by C-RNTI (Cel 1-RNTI) to a UE having one or more downlink cells set therein.

12) Sounding Reference Signal (SRS) Request - Consists of 0 or 1 bit. Here, this field exists only when the PUSCH to be scheduled is mapped by the C-RNTI in UE specific manner.

13) Resource alocation type - It consists of 1 bit.

The DCI if the number of information bits in format 0 is less than the payload size of the DCI format 1A (including the added padding bits), DCI, the payload size of the DCI format 1A equal to 0, map format Messenger _0.0. .

. FIG. 4 illustrates a structure of a UL subframe in a wireless communication system to which the present invention can be applied.

. Referring to FIG. 4, the uplink subframe can be divided into a control region and a data region in the frequency domain. A Physical Uplink Control Channel (PUCCH) for carrying uplink control information is allocated to the control region. A Physical Uplink Shared Channel (PUSCH) for carrying user data is allocated to the data region. To maintain a single carrier characteristic, one terminal transmits PUCCH and PUSCH simultaneously Do not.

A resource block (RB) pair is allocated to a PUCCH for one UE in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. It is assumed that the RB pair assigned to the PUCCH is frequency hopped at the slot boundary. The physical uplink control channel (PUCCH)

The uplink control information (UCI) transmitted through the PUCCH may include a scheduling request (SR), HARQ ACK / NACK information, and downlink channel measurement information.

The HARQ ACK / NACK information may be generated according to whether decoding of the downlink data packet on the PDSCH is successful. In a conventional wireless communication system, one bit is transmitted as ACK / NACK information for a downlink single codeword transmission _. . For the DL 2 codeword transmission, 2 bits are transmitted as ACK / NACK information. The channel measurement information refers to a feedback description related to a multiple input multiple output (MIMO) scheme. The channel measurement information includes a channel quality indicator (CQI), a precoding matrix index (PMI) And may include an indicator (RI: Rank Indicator). These channel measurement information may collectively be referred to as a CQI.

20 bits per subframe may be used for CQI transmission.

. PU.CCH. Can be modulated using binary phase shift keying (BPSK) and quadrature phase shift keying (QPSK) techniques. The control information of a plurality of terminals can be transmitted through the PUCCH and code division multiplexing (CPM) is performed in order to distinguish the signals of the terminals. In this case, a Constant Amplitude Zero Autocorrelation (CAZAC) sequence of length 12 . Since the CAZAC sequence maintains a constant amplitude in the time domain and the frequency domain, the CAZAC sequence has a peak-to-average power ratio (PAPR) or a cubic metric (CM) Lowering the properties to increase coverage. Have a good day. Further, in the downlink data transmission transmitted through the PUCCH The ACK / NACK information is covered using an orthogonal sequence or an orthogonal cover (OC).

In addition, the control information transmitted on the PUCCH can be distinguished using a cyclically shifted sequence having different cyclic shift (CS) values. The circularly shifted sequence can be generated by cyclically shifting the base sequence by a certain amount of CS (cycli shift amount). The specific amount of CS is indicated by the cyclic shift index (CS index). The number of available cyclic shifts can vary depending on the channel's delay spread. Various kinds of sequences can be used as the background sequence, and the above-described CAZAC sequence is an example thereof.

In addition, the amount of control information that the UE can transmit in one subframe depends on the number of SC-FDMA symbols available for transmission of control information (i.e., reference signal (RS) transmission for coherent detection of PUCCH) (I.e., SC-FDMA symbols used, excluding SC-FDMA symbols).

In the 3GPP LTE system, the PUCCH is defined by a total of seven different formats according to the control information, the modulation technique, the amount of control information, and the like. The uplink control information (UCI) transmitted in each PUCCH format control information can be summarized as shown in Table 5 below.

[Table 5]

PUCCH format 1 is used for exclusive transmission of SR. In the case of SR ¾ dock transmission, an unmodulated waveform is applied, which is described in more detail below.

The PUCCH format la or lb is used for transmission of HARQ ACK / NACK. random When the HARQ ACK / NACK is transmitted alone in the subframe, the PUCCH format la or lb may be used. Alternatively, HARQ AC / NACK and SR may be transmitted in the same subframe using the PUCCH format la or lb.

PUCCH format 2 is used for transmission of CQI, and PUCCH format 2a or 2b uses CQI and HARQ ACK / NACK transmission.

In case of extended CP, PUCCH format 2 is CQ1 and HARQ ACK / NACK. Lt; / RTI >

5 is a diagram illustrating an example of a form in which PUCCH formats are mapped to a PUCCH region of an uplink physical resource block in a wireless communication system to which the present invention can be applied. _: ,.

FIG. 5 shows the number of resource blocks in the uplink, and 0, 1 and 1 denote numbers of physical resource blocks. Basically, the PUCCH is fed to both edges of the uplink frequency block. As shown in 5, PUCCH in the PUCCH, which is expressed as ni = 0, l format 2 / 2a / 2b are is maekwing, which PUCCH Po ¹ 2 / 2a / 2b are band-end ¾03 ^ (16 (1 6 The PUCCH format 2 / 2a / 2b and the PUCCH format 1 / la / lb are mapped together (mi xed) in the PUCCH area indicated by m = 2 ^.. the number of PUCCH format 2 / 2a / PUCCH RB usable by 2b (- region PUCCH format 1 / la / lb may have to be mapped itdi: number itdi next, m = 3, 4, PUCCH represented by 5. ) are to terminals in the cell by the broadcast signaling. it can be directed ¾ ^'.

_. PUCCH format: The digits described for ^' .2 / 2a / 2b. PUCCH format 2 / 2a / 2b is a control channel for transmitting channel measurement feedback (CQ ^ PMI, RI).

A frequency unit (or frequency resolution) of the channel and the reporting period of the measurement feedback (collectively referred to as CQI information hereinafter) and the measurement object can be controlled by the base station. In the time domain itdi can be supported based periodic and aperiodic CQI reporting. PUCCH Format 2 is used only for periodic reporting, and PUSCH for non-periodic reporting can be used. In case of non-periodic report, the base station transmits the individual CQI report to the UE in the scheduled resource for uplink data transmission Can direct

FIG. 6 is a diagram illustrating an example of a process of processing an uplink shared channel, which is a transport channel, in a wireless communication system to which the present invention can be applied. The signal processing of the uplink shared channel (UL-SCH) may be applied to one or more transport channels or control information types.

Referring to FIG. 6, the UL-SCH is transmitted to a conding unit in the form of a transport block (TB) once every transmission time interval (TTI).

The bits' ^ ',' ² ',' ^{3 '} , ..., and'', And the CRC parity bit PO'P ^ U L- is attached to the parity bit (S6010). Where A is the size of the transport block and L is the number of parity bits. The input bits with CRC are _equal to b ₀ , b _] , b ₂ , b ₃ , ..., b _B _l , where B denotes the number of bits in the transport block including the CRC. ^'

to: (Code block CB) in bumhal (segmentation) and, the number of CB to _Q b ^, b _l, b _2, b _3, ..., b _R _, is number of code blocks based on the TB size CRC is attached (S6020). After splitting the code block and attaching the CRC,

Respectively. _. Where r is the number of the code bits (r = Q,..., Cl), Kr is the number of bits according to the code block r, and C is the total number of code blocks.

Then, channel coding is performed (S6030). After the channel coding bits are output., 1, ^2, ³ ', ^ (-0 ingot. Equal. In this case, i is the coded stream index, _0, may have the value 1 or ₂ eu _Dr is a block _code!> (R = 0, '', C_l), C is the total number of code blocks, and each code block represents the number of bits in the turbo coding . Then, rate matching is performed (S6040). The bits after rate matching are equal to ^ O ^ '^ ² ' ^ ³ _^ '^^^). Where r is the number of the code block (r = 0, "", Cl), C is the total number of codeblocks, and Er is the number of rate matched bits of the rth code block.

Next, concatenation between the code blocks is performed again (S6050). The bit after the combination of the code blocks is

same. In this case, G denotes the total number of coded bits for transmission, and when the control information is multiplexed with the UL-SCH transmission, the number of bits used for control information transmission is not included.

Meanwhile, when the control information is transmitted on the PUSCH, the control information CQI / PMI, RI, and ACK / NACK are independently channel-encoded (S6Q70, S6080, S6090). Since different encoded symbols are allocated for transmission of each control information, each control information has a different coding rate.

In ACK / NACK feedback mode in TDD (Time Division Duplex), two modes are supported: ACK / NACK bundling and ACK / NACK multiplexing. The ACK / NACK information bit is composed of 1 bit or 2 bits, and the ACK / NACK information bit is composed of 1 bit to 4 bits for ACK / NACK multiplexing.

After the code-to-block combining step in step S134, the coded bits of the UL-SCH data

(S12060). &Lt; / RTI > The multiplexed result of data and CQI / PMI

^ ο,, ^ ² , ^ ³ , ···, ^^ -, I am so tired. (, · = 0, ...,) denotes a column vector with (a ,,. / V, ᅳ). ^{// = +} ᅳ ^ ^/ )

to be. ^N L denotes the number of layers to which the UL-SCH transport block is mapped, H denotes a total number of coded bits allocated for the a-SCH data and the CQI / PMI information in the ^N L transport layers to which the transport block is mapped _. .

Next, the multiplexed data and the CQI / PMI, separately channel-encoded RI ACK / NACK, And an output signal is generated by channel interleaving (S6100). MIMO (Multi-Input Multi-

MIMO technology has traditionally used multiple transmit (Tx) antennas and multiple receive (Rx) antennas instead of using one transmit antenna and one receive antenna. In other words, the MIMO technique is a technique for increasing the capacity or improving the performance by using a multi-output antenna at a transmitting end or a receiving end of a wireless communication system. Hereinafter, " MIM0 " will be referred to as " multiple input / output antenna ". More specifically, the MIMO technique does not rely on a single antenna path to receive a complete message (total 1 333), but rather collects a plurality of pieces of data received over multiple antennas to obtain a complete D - complete the data. As a result, the MIMO antenna technology can increase the data rate within a certain system range, and can also increase the system range through a certain data rate.

As next generation mobile communication requires much higher data transmission than existing mobile communication, it is expected that multi-input / output antenna technology is required. MIMQ communication technology is a next-generation mobile communication technology that can be widely used for mobile communication terminals and repeaters, and is limited due to expansion of data communication, etc. As a technology capable of overcoming the transmission limit of other mobile communication Collect J1. _. ...

. Meanwhile, . _. .. Currently: being studied _. (MIMO) technology is one of the most promising methods for dramatically improving communication capacity and transmission / reception performance without additional frequency allocation or power increase. .

. Demodulat ion reference signal for PUSCH

The reference signal sequence m) for the generation of the single-direction link DMRS is generated by Equation 1 below when transform precoding for the PUSCH is not allowed _. .

At this time, if the transform precoding for the PUSCH is not allowed There may be a case where a transmission signal of the CP-OFDM scheme is generated.

[Equation 1]

Where c (i) denotes the pseudo-random sequence. If transform precoding for the PUSCH is allowed, the reference signal sequence r (m) is generated by Equation (2) below.

At this time, it is possible to generate a transmission signal of the DFT-S-0FDM scheme as an example of the case where the transform precoding for the PUSCH is allowed.

&Quot; (2) "

The MRS of the generated PUSCH is mapped to a physical resource according to Type 1 or Type 2 given by the upper layer parameter as shown in FIGS. 7 and 8.

At this time, the DMRS can be mapped to a single symbol or a double symbol according to the number of antenna ports.

If the transformed precoding is not allowed, the reference signal sequence r (m) can be mapped to a physical resource by Equation (3) below.

&Quot; (3) "

4

In the equation 31 are defined relative to the start of a PUSCH ^{^{transmission, wf (A '), w}} t (/'), and Δ is given by the following Table 6 and Table 7.

Table 6 below shows an example of parameters for the MRS of the PUSCH for type 1.

[Table 6]

P?

k '= 0 k' = \ / '= 0 /' = 1 1000 0 +1 +1 +1 +1

1001 0 + 1 -1 + 1. + 1

1002 1 +1 + 1 + 1

1003 1 +1 -1 +1 +1

1004 0 +1 +1 +1

1005 0 +1 -1 +1 -L

1006 1 + L +1 + 1 -1.

1007 1 +1 -1 +1 -1 Table 7 below shows an example of the parameters for the DMRS of the PUSCH for type 2 words.

[Table 7]

Table 8 below shows an example of a time domain index ^ and a supported antenna port P according to the upper layer parameter ULJ) MIS_d '.

[Table 8]

Table 9 below shows an example of the start position of the DMRS of the PUSCH.

[Table 9]

Upward Rank DMRS Parameter /

Single symbol DMRS Double symbol DMRS

PUSCH mapping PUSCH mapping PUSCH mapping PUSCH mapping type A type B type A type B

0 t _1/0 , ⁷

. 2

_3/0 , 11

In another embodiment of the present invention, in order to use a quasi-orthogonal DMRS sequence for different transmission beams, information related to the beam may be included in the initialization parameters of the base sequence of the DMRS.

At this time, the information related to the category may include at least one of a CRI, a port index, or an SS block index.

In this case, the signaling overhead can be reduced because it is not necessary to transmit beam-related information in the DCI table.

Demodulation reference signals for PDSCH

The reference signal sequence r (m) for generating the downlink DMRS is generated by Equation (4) below.

Equation .4] r {m) = - ^ (l-2- c (2m)) + '下(1 _ 2. c {2m + 1))

2 V2

Here, c (i) means the pseudo-random sequence. The DMRS of the generated PDSCH is mapped to a physical resource according to Type 1 or Type 2 given by the upper layer parameter.

At this time, the reference signal sequence r (m) can be mapped to a physical resource according to Equation (5) below.

&Quot; (5) "

4 ^{Ρ Ρ} ^Μ) ') · ^w , {1') r (2m + k '+ m ₀

In Equation (5), 1 is defined relative to the beginning of the slot, (, ^w '( ^r ), and? Are given by Tables 10 and 11 below.

The time axis index Γ and supporting antenna ports p depend on the upper layer parameter _DL jMRS_d according to Table 12 below. The values in Table 13 depend on the mapping type. It depends on the given upper layer parameter DL_DMRS_add_pos:

- for the PDSCH mapping type A: if the upper layer parameter DL_DMRS_typeA_ _P os, such as 3, and 1 ₀ = 3, otherwise a 1 ₀ = 2.

For PDSCH mapping type B: 1 ₀ , the MRS is mapped to the first OFDM symbol in the scheduled PDSCH resource.

Table 10 below shows an example of parameters for DMRS configuration type 1 of the PDSCH.

[Table 10]

Table 11 below shows an example of parameters for the DMRS configuration type 2 of the PDSCH.

[Table 11]

Table 12 below shows an example of the Durat ion of the PDSCH DMRS. [Table 12]

[Table 13]

Procedure of UE for receiving PDSCH

When the UE detects a PDCCH with a configured DCI format, it has to decode the corresponding PDSCH as indicated by the corresponding DCI.

If the UE is configured to decode the PDCCH with a scrambled CRC with C-RNTI, then the UE must decode the PDCCH and its corresponding PDSCH. The scrambling of these PDSCHs is determined by the C-RNTI.

IJE can derive the upper layer parameter DL-DMRS-con fig-type indicating the configuration type of the DMRS and the DMRS type for the PDSCH from the configured CP type as shown in Table 14 below. ·

[Table 14] ...

If _. If the UE is configured with an additive DMRS for the PDSCH by an upper layer parameter, multiple DMRS symbols can be transmitted.

UE is upper. The DMRS port, which consists of layer parameters, has a delay spread, It can be assumed that the Doppler spread, the Doppler shift, the average gain, the average delay, and the spatial RX parameters are QCUquicated.

If the UE is configured with an upper parameter 'DL-PTRS-present', the UE can assume that the presence and pattern of the PTRS (Phase Tracking Reference Signal) antenna port is a function of the corresponding scheduled MCS and scheduled bandwidth have.

If the UE is configured with higher layer parameters 'dmrs-group2' and 'DL-PTRS-present', then the UE may determine that the PTRS antenna port number for the TBD of the association parameters is less than the DMRS antenna Lt; RTI ID = 0.0 > ports. &Lt; / RTI >

If the UE is configured with upper layer parameters DL-PTRS-present and dmrs-group2, then the PT-RS port is associated with the DM-RS antenna port of the lowest index among the configured DM- RS antenna ports shown in the dmrs-group2 configuration for the PDSCH .

FIG. 7 is a diagram illustrating a self-contained subframe structure in a wireless communication system to which the present invention can be applied.

In order to minimize the data transfer latency in the TDD system, a self-contained subframe structure as shown in FIG. 4 is considered in the 5G (5G) new RAT.

In FIG. 7, a hatched area (symbol index 0) represents a DL control area and a black part (symbol index 13) represents an UL control area. The area without shadow indication may be used for DL data transmission, or for UL data transmission. This structure is characterized in that DL transmission and UL transmission are progressed in one subframe, DL data is transmitted in a subframe, and UL ACK / NACK can also be received. As a result, when a data transmission error occurs. _. This reduces the time it takes to retransmit data, which minimizes the latency of the final data transfer.

In this self-contained subframe structure, a time gap is required between the base station and the UE for switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. For this, we propose a self-contained subframe structure A part of the time point when the DL is switched to the UL (the DM symbol is set as a guard period (GP)).

FIG. 8 is a diagram illustrating an example of a mapping method of a DMRS to which the present invention can be applied.

Referring to FIG. 8, the location where the second DMRS is coupled to the front-load DMRS and the additional DMRS may be variable.

Specifically, when a subframe includes an OFDM symbol for a purpose other than an OFDM symbol for downlink data transmission in one subframe (or slot) as in a self-contained subframe structure shown in FIG. 7, Depending on the structure of the subframe, the setting and position of additional DMRS can be determined.

For example, if the structure of the subframe is 7 symbol slots, additional DMRS may not be transmitted but only front-load DMRS may be supported. If the structure of the subframe is composed of 14 symbol slots, front-load Only DMRS can be supported, or front-load DMRS and additional DMRS cameras can be supported.

In particular, the location of the time axis OFDM symbol to which the additional MRS is invoked may be determined according to at least one of a DL / UL slot configuration, a slot type, or a slot structure. That is, as shown in FIG. 8, in the additional DMRS in the self-supporting subframe structure, the position of the OFDM symbol allocated according to the guard interval and the PUSCH region can be changed. For example, in the case of a self-supporting surveillance frame, the structure of the shelter frame may be changed according to the guard interval, the PUCCH, and the PUSCH interval.

In the case of interpolating channels in the time domain when the subframes of the subframe are changed as in the case of setting the time axis position of the additional DMRS to the same watch regardless of the subframe structure, ) Is prolonged, so that the channel estimation richness can be deteriorated.

Therefore, additional DMRS can be mapped to a QFDM symbol according to the structure of a subframe in order to estimate a time-domain varying channel.

9 shows an example of a pattern of a demodulation reference signal to be suppressed in the present specification. Referring to FIG. 9, a demodulation reference signal for estimating a channel includes In particular, the uplink DMRS and the downlink DMRS may be generated in the following manner and mapped to the resource area. 9 (a) and 9 (b) illustrate an example of an uplink or downlink H DMRS mapped to a physical resource according to type 1, and FIGS. 9 (c) and 9 And a demodulation reference signal for demodulating the uplink data or the downlink data is generated by mapping a demodulation reference sequence to an OFDM symbol.

Demodulation reference signal sequence may be mapped to the ⁱ Dali 1 to mapping type or two QFDM symbols as shown in Fig. 18 and 19, a CDM scheme may be applied to the port multiplexer.

FIG. 10 is a diagram illustrating an example of a DMRS port indexing method proposed in the present specification. FIG.

As shown in FIG. 10, the DMRS port mapping characteristic may vary depending on the mapping type of the DMRS.

Specifically, when the mapping type of the DMRS is Type 1 as described above, the DMRS port indexing is as shown in FIG. 10 (a) and Table 15 below.

[Table _. 15]

Port indexing Frequency of f set: delta FD-OCC

XX 0 0 + 1 + 1

- XXI 0 + 1 - 1

XX2 1 + 1 + 1

XX3 ^; 0 + 1 - 1

When the mapping type of the DMRS is Type 2 as described above, the DMRS port indexing is shown in FIG. 10 (b) and Table 16 below.

[Table 16]

Port. indexing Frequency of f set: delta FD-OCC

XX 0 0 + 1 + 1

; XXI. 0 + 1 - 1

XX 2 2 + 1 + 1

XX3 2 + 1 - 1

XX4. 4 + 1 + 1

XX5 4 + 1 - 1 QCL (Quasi-Co Location)

An antenna port is defined such that the channel on which the symbol on the antenna port is carried can be squeezed from the channel on which the other symbol on the same antenna port is carried. If the property of the channel over which a symbol on one antenna port is to be inferred can be deduced from the channel on which the symbol on another antenna port is carried, the two antenna ports may be quasi co-located (QC / QCL) -location) relationship. Here, the channel characteristic may be at least one of a delay spread, a Doppler spread, a frequency shift, an average received power, a received timing, and a spatial RX parameter. D - containing. Here, the Spatial Rx parameter means a spatial (reception) channel characteristic parameter such as an angle of arrival.

The UE can be configured with a higher layer parameter PDSCH-Config, up to M TCI-Stat conf ig uration lists, to decode the PDSCH according to the detected PDCCH with the intended DCI for the corresponding serving cell. have. Above _. M depends on the UE capability.

Each TCI-State includes a parameter to set the quasi co-location relationship between one or two DL reference signals and the DM-RS port of the PDSCH.

Quasi co-location relationship are set to the first (if set) higher layer parameter qcl- Typel for the second DL RS ^and, qcl-Type2 for two ¾ second DL RS.

For two DL RSs, the QCL type is not the same regardless of whether the reference is the same DL RS or a different DL RS.

The quasi co-location type corresponding to each DL RS is given by the hi each layer parameter qcl-Type of QCL-Info and can take one of the dow values:

- 'QCL-Type A': {Dop ler shift Doppler spread, average delay, delay spread}

-, 'QCL-Type B': {Doppler shift, Doppler spread}

- 'QCL-Type C: {Dop ler shift, average delay}

- 'QCL-TypeD': {Spatial Rx parameter}

For example, if the target antenna port is a specific NZP CSI-RS, the corresponding NZP CSI- The RS antenna ports can be specified / set by the specific TRS from the QCL-Type A point of view and QCL from the QCL-Type D point of view. The UE receiving the indication / setting receives the corresponding NZP CSI-RS using the measurement ¾ Doppler, del ay value in the QCL-Type A TRS and transmits the reception beam used for the QCL-Type D SSB reception to the corresponding NZP CSI- Can be applied.

The IJE receives an activation coinniand used to map up to 8 TCI states to the codepoint of the DCI field 'Transmission Configuration Indication ¹ '.

One of the functions of the DCI is to transmit scheduling information of downlink 3, uplink or side link to the UE. A plurality of DCI formats are defined according to information to be transmitted to the UE, and a DCI format includes a plurality of

There are a number of DCI formats defined for information delivery, and a number of fieUl for delivering DCI fomat specific information.

The base station receives the different information in each field of the DCI and transmits it to the terminal. The terminal. Receives a field defined in the DCI format of the PDCCH and decodes it to schedule it _. Information other than information - It is possible to receive information related to the operation to be performed by the terminal.

The terminal can perform operations such as receiving data accordingly.

For example, in the case of DCI format 2D, it is referred to as DCI field 1 below the fiekK, which means information on antenna ports, scrambling identification, and number of layers) and PDSGH. (Hereinafter referred to as " DCI field 2 "), which represents information on the RE Mapping and Quasi-Co-Locator Indicator, can be defined.

_First. Terminal. By receiving information of the I field 1 from the base station is the base station can detect the information on the port index is the total layer number and the data is transmitted _using, for data transmission.

Then, by receiving the information of DCI field 2, it is possible to detect information on CSI-RS resources that are used for data transmission detected through DCI field 1 and the QCL relationship is established.

CSI-RS resource information is transmitted to the UE through higher layer signaling And the QCL relationship between the port where the data transmission is performed and the CSI RS resource can be flexibly set to the UE through the DCI signaling

The UE can acquire the secondary statistical information of the channel (e.g., delay confidentiality, Doppler spread, etc.), which can improve the performance in channel estimation for each CSI-RS resource.

Therefore, based on the information indicated by the DCI field 2, it is possible to recognize the CSI-RS resources having the QCL relationship with the antenna ports set through the DCI field 1. Based on this, Can be used in the channel estimation step to improve the channel estimation performance.

In addition, the UE can recognize a single TRP transmission or a double TRP transmission (e.g., Comp (NCJT)) through the QCL information indicated by the DCI field 2.

For example, if one CSI-RS resource is indicated, the UE can assume that it is a single TRP transmission. If two CSI-RS resources are indicated, the UE transmits a double TRP (i. E. )). &Lt; / RTI >

On the other hand, when the QCL relationship is established between the antenna ports multiplexed through the CDM method in the frequency domain, a problem may arise in the relationship between DCI field 1 and DCI field 2.

The index of the antenna port associated with the number of transmission layers in DCI field- 1 is fixed. In this case, when there is no constraint that the QCL system must be established between the antenna ports multiplexed through the CDM method in the frequency domain, there is no QCL restriction for the multiplexing system. Therefore, DCI Different QCL information (eg, single TRP transmission / double TRP transmission) is possible via field 2.

If the QCL relationship is established between antenna ports multiplexed through the CDM method in the frequency domain, the multiplexing scheme between the ports set in DCI field 1 may be affected by the QCL setting indicated by DCI field 2 have.

For example, in the case of a 2-layer transmission, a double TRP transmission in DCI field 2 As a result, there is a problem that the two ports indicated by DCI field 1 can not be multiplexed in the frequency domain through the CDM scheme.

In the NR, a DCI field that can replace the role of DCI field 2 described above is discussed.

This DCI field includes a set of antenna ports (hereinafter referred to as DPG (DMRS)) for transmitting an RS set (s), which can be composed of various RS types (for example, CSI-RS, TRS, PTRS, quot; port group ").

The OMRS port group consists of a set of antenna ports for the QCL system.

In order to solve this problem, it is necessary to consider the QCL information between the DM S port group (and / or the DMRS ports) and the RS set (s) (and / or the CSI-RS resources) The rules for the DMRS port indication between the base station and the terminal that can satisfy the condition that the QCL relationship between the ports occupying the same E (and possibly including the CDM in the time domain) is satisfied There is a need to be defined.

Accordingly, the present invention proposes a method and a rule for informing a terminal of information related to antenna ports for transmitting D packets S between a base station and a base station.

Hereinafter, the present invention will be described on the _assumption that the port mapping, the DMRS mapping pattern, and the RE mapping relationship are as shown in FIG. 9 unless another explicit description is added. The ports P0, P1 and P2, P3, P4, P6 and P5, P7 shown in FIG. 9 and FIG. 9B denote ports multiplexed through the frequency domain CDM, And PI, P6 and P5, P5 and P3, and P7 represent the ports multiplexed over the time domain CDM. -. The PQ, P1 port and P2 P3 port and P4, P5 port and P6, P9 port and P7, P10 port and P8, P11 port shown in Figs. 9 (c) and 9 PQ, P6 and PI, P9 and I? ² , P7 and P3, P1 and P4, P8 and P5, PU ports refer to multiplexed ports over the time domain CDM.

However, the present invention is not limited to this, and the port indexes of various reference signals, Mapping pattern, and RE mapping relationship.

Also ^. 11, the UE can receive the reverse reference signal through a plurality of pressure ports, and the demodulation reference signal can be transmitted through a plurality of TRPs with different QCL conditions.

Specifically, the UE can receive a DCI for receiving a reference signal (e.g., a demodulation reference signal) through a control channel (e.g., PDCCH) (S11010).

At this time, the DCI transmits resource information related to a resource to which the CSI-RS (first reference signal) is transmitted, port combination information (or QCL information related to a combination of at least one antenna port through which a demodulation reference signal (second reference signal) The layer information indicating the number of layers, the symbol information indicating the number of symbols to which the reference signal is mapped, or the at least one antenna port through which the demodulation reference signal is transmitted, And layer information related to the number of layers.

In addition, the DCI eld included in the DCI format can be configured in various ways, which will be described in detail below.

One antenna port through which a demodulation reference signal is transmitted may be included in one or more antenna port groups which are groups of antenna ports that are multiplexed through the same multiplexing method based on the resource information.

Then, the terminal can receive the data and the DMRS through at least one antenna port based on the DCI transmitted from the base station (S11020).

Specifically, the UE can acquire information related to a pattern in which the DMRS is mapped to a symbol (for example, location of an antenna port index resource) through the information included in the DCI transmitted from the base station, The channel value required for channel compensation can be estimated.

The UE compensates the channel for the received data using the estimated channel value, and performs demodulation and decoding of the received data based on the compensated channel to detect the data transmitted by the BS. Through this method, even when a reference signal and data are transmitted from a base station of a north-number system, the terminal can receive a reference signal and data through antenna ports having a QCL relationship.

The terminal may be composed of a processor, an RF unit and a memory as shown in FIGS. 23 to 26 below, and the processor may be configured such that the RF unit receives downlink control information (DCI) from the base station , And to receive the second reference signal via the at least one pressure port based on the DCI.

Here, the downlink control information may include resource information related to a resource to which the first reference signal is transmitted, and port combination information related to a combination of at least one antenna port through which the second reference signal is transmitted.

Also, the at least one antenna port may be included in one or more antenna port groups based on the resource information, and each of the one or more antenna port groups includes all antenna ports multiplexed through the same multiplexing scheme .

12 is a diagram showing an example of a method for transmitting a demodulation reference signal by the base station proposed in this specification.

Referring to FIG. 12, a base station can transmit a demodulation reference signal to a mobile station through a plurality of antenna ports, and a demodulation reference signal can be transmitted through a plurality of base stations having different QCL conditions.

Specifically, the base station can transmit the DCI including the information related to the reference signal (for example, demodulation and reference signal) to the terminal through the control channel (for example, PIXXH) (S1201Q).

At this time, the DCI includes port combination information (2E: QCL (2)) related to a combination of at least one antenna port through which a demodulation reference signal (second reference signal) is transmitted, resource information related to a resource to which a CSI- Information on the port of the antenna port set by the base station, layer information indicating the number of layers, symbol information indicating the number of symbols to which the reference signal is appended, or at least one antenna port through which the demodulation reference signal is transmitted, At least one of the layer information related to the number of layers .

In addition, the DCI field included in the DCI format can be configured in a variety of ways, which will be discussed in more detail below.

One or more antenna ports through which a demodulation reference signal is transmitted may be included in one or more antenna port groups which are groups of antenna ports multiplexed through the same multiplexing method all based on resource information.

Then, the base station can transmit data and DMRS through at least one antenna port based on! XI to the terminal (S12Q20).

At this time, the base station can map the at least one particular code (for the ¾, ¾ suit the RS sequence, and so on) in order to transmit the demodulation reference signal to the terminal in at least one _layer: .

Then, the base station can transmit by mapping _÷ eut at least one layer on at least one antenna port, a demodulated reference signal to the terminal through the plurality of antenna ports itdi V. _:. .

A specific method for mapping at least one layer to at least one antenna port will be described below.

Through such a transmission, the terminal can receive the reference signal and the data through the antenna ports having the QCL relationship, even when the terminal is transmitted from the plurality of base stations.

. The base station includes a processor, an RF unit, and a memory, as shown in Figures 23 to 26 below _. The processor may be configured such that the RF unit transmits downlink control information (DCI) to the terminal and transmits the downlink control information (DCI) to the ^terminal through the at least one antenna port And to transmit the second true S signal to the terminal.

At this time, the downlink control information may include resource information related to a resource to which the first reference signal is transmitted, and port combination information related to a combination of at least one antenna port through which the second reference signal is transmitted.

The at least one ports may be included in one or more of the tenacute groups based on the resource information, Each of the above antenna port groups may include antenna ports multiplexed through the same multiplexing scheme.

Hereinafter, the configuration of the DCI field included in the DCI will be described.

A DCI field including information on antenna ports, the number of layers, the number of symbols, and the like in the DCI format can be defined. In this case, in the case of transmission of a specific layer (for example, 2, 3,... Layers), a method of multiplexing an example specific layer in a multiplexing group, which is a group of antenna ports multiplexed through the same multiplexing method, All methods of multiplexing layers can be defined in the DCI field.

That is, a combining method of antenna ports for multiplexing can be defined in the DCI field in the antenna ports included in the multiplexing group. At this time, not only a combination of antenna ports included in the same multiplexing group but also a combination of antenna ports included in different multiplexing groups can be defined in the DCI field.

. For example, the sum of antenna ports included in Group 1 and Group 2 of antenna ports multiplexed through the same CDM method can be defined in the DCI field. Here, Group 1 and Group 2 are the same or different CDM method can be applied.

At this time, a multiplexing group (hereinafter referred to as SCG) is a group of antenna ports multiplexed through CDM (Code Division Multiplexing) (CDM) in the frequency domain and / or a group of antenna ports _. Antenna ports multiplexed through the CDM method in frequency and time domain _. A group of can mean to come.

In the case of Comp (NCJT) transmission in which data is transmitted in different base stations (or TRPs), the QCL system must be established between the antenna ports used for data transmission in the same TRP (i.e., antenna ports in the DPG) A QCL relationship can not be established between antenna ports used for data transmission in the base station (i.e., antenna ports between different DPGs).

Therefore, when reference signals and data are transmitted in a plurality of TRPs, antenna ports used for data transmission in each TRP must be set to the UE so that a QCL relationship can be established between the antenna ports. At this time, in order to structurally set the security ports to the terminal,

The antenna ports of each terminal can be set by defining a rule for associating antenna ports belonging to each group with the DPG in association with QCL information transmitted through XI. have.

SCG represents an example of a unit group of antenna ports that can be established by the QCL Guam system from a terminal perspective.

For example, if SCG1 is composed of (PO, PI, P4, P6) antenna ports and SCG2 is composed of (P2, P3, P5, P7) antenna ports, Four antennas _. The base station and the terminal can recognize that there is a QCL relationship between the ports.

. At this time, the QCL relationship between SCG 1 and SCG 2 depends on the configuration of the base station through higher layer signaling (e.g., RR.C and / or MAC CE) and / or DCI signaling, It can be defined as a rule.

That is, all the antenna ports included in SCG 1 and SCG 2 are set to establish a QCL relationship with each other. In other SCG examples, the antenna port abatement can be set so that the QCL relationship does not hold.

Also, the antenna ports included in each SCG are set up with a fixed value between the base station and the terminal - through higher layer signaling (eg, RRC and / or MAC CE) and / or DCI signaling The antenna ports included in each SCG from the base station to the terminal could be set.

Table 1.7 below shows an example of an SCG consisting of in-tenni ports that are multiplexed through the CDM method on the frequency axis when the configuration type of D-clothes S is 1. -

[Table 17]

The SCG consists of antenna ports multiplexed through the CDM method. Respectively.

[Table 18]

Table below

FIG. 4 is a table showing an example of an SCG composed of multiplexed antenna ports. FIG.

[Table 19]

Table 20 below shows the case where the configuration type of DMRS is 2,

And an antenna port multiplexed through a CDM method.

[Table 20]

In the same way, the same SCG can be defined regardless of the number of symbols, depending on the number of symbols to which the front-load DMRS is mapped. Table 21 below shows an example of a DCI field (hereinafter referred to as a DMRS table) when the DMRS is mapped to one symbol when the configuration type of the DMRS is 1.

[Table 21]

value Message

\ # of layers antenna pprt (s) # of symbols

X 2 layer P0, PI 1 x + 1 2 layer P2, P3 1 x + 2 2 layer P0, P2 1

^' x + 3 2 layer PI, P3 1 Tables 22 and 23 show an example of a DMRS table when the DMRS is mapped to two symbols when the configuration type of the DMRS is 1. FIG.

[Table 22]

[Table 23]

Tables 21 to 23 show an example of defining 5CG as antenna ports that are multilayered through the CDM method on the frequency axis when SCG is defined. Since this method uses the same resource element when multiplexing two layers of transmission between different SCGs, it is possible to reduce the RS overhead compared with the case of multiplexing two layers between SCGs distinguished by FM.

When the front-end DMRS is attached to two symbols, x (for example, 2, 3, -) When layer multiplexing is performed, the multiplexing between different SCGs can be used with priority given to the CDM method at the time axis.

Table 24 below shows an example of a DMRS table when the DMRS is mapped to one symbol when the configuration type of the DMRS is 2.

[Table 24]

Tables 25 and 26 below show an example of a DMRS table when two types of DMRS are added when the configuration type of the DMRS is two.

[Table 25]

[Table 26] value message

# of

# antenna port (s)

layers symbols

X 2 layer PO, PI 2

x + 1 2 layer P2, P3 2

x + 2 2 layer P4, P5 2

x + 3 2 layer P6, P9 2

x + 4 2 layer P7, P10 2

x + 5 2 layer P8, P1 2

x + 6 2 layer PO, P6 2

x + 7 2 layer P1, P9 2

x + 8 2 layer P2, P7 2

x + 9 2 layer P3, P10 2

x + 10 2 layer P4, P8 2

x + 1 1 2 layer P5, P11 2 Tables 24 to 26 show an example of a case where SCC _T is defined by antenna ports multiplexed on the frequency axis by the CDM method. This method uses the same resource element when two-layer transmission is multiplexed between different SCGs, so RS overhead can be reduced as compared with the case where two layers are multiplexed between SCGs distinguished by FDM.

In addition, antenna ports can be multiplexed using an appropriate multiplexing scheme depending on the situation. For example, you need to use a specific multiplexing scheme, such as COITI _P (NCJT). There is an effect that freely scheduling is possible.

A DCI field-group may be defined in the DCI format, which consists of information about the ports, the number of layers, the number of symbols, and the like. At this time, the specific layer (for example, 2, 3, layer, _etc.) of the transmission. , A combination of two or more antenna ports may be defined in one state (st a e).

At this time, DMRS. And combinations of antenna ports used for transmission of data may be associated with QCL information between DPG (and / or .DMRS ports) and RS sets (and / or CSI-RS resources, etc.) A specific combination Can be set -.

For example, when the QCL information indicates a plurality of CSI-RS resources (i.e.,

TRP), the actual reference signal and the combination of antenna ports used to transmit the data may be set to a combination of antenna ports that perform multiplexing between different SCGs.

Conversely, if the QCL information information points to a single CSI-RS resource, the combination of antenna ports used for the actual transmission may be set to a combination of antenna ports performing multiplexing within the same SCG.

At this time, since the definition of the DCI field is predefined between the BS and the UE, the UE can acquire information related to the set antenna port, the number of layers, and the number of symbols by receiving the DCI field transmitted through the control channel.

In other words, . The UE can recognize the multiplexing method of the reference signal and the pressure ports for transmitting the data through the QCL information transmitted through the DCI field.

In this case, since a combination of a plurality of antenna ports is defined in one state, and a combination of antenna ports for receiving a reference signal and data in addition to QCL information is selected, a DCI payload You could reduce the size.

QCL information Table 27 below maps the front-load DMRS of configuration type 1 to one symbol _. &Lt; / RTI >< RTI ID = 0.0 >

[Table 27] _. ....

Referring to Table 27, it can be seen that a combination of a plurality of antenna ports is set for transmission of a specific layer.

When the QCL information information indicates a plurality of CSI-RS resources (i.e., TRP), it can be assumed that the reference signal and the data are transmitted to the UE in a combination of antenna ports corresponding to case 2 in Table 27. [

Conversely, if the QCL information information indicates a single CSI-RS resource, it can be assumed that the UE is subject to a reference signal and data transmission via a combination of antenna ports corresponding to case 1.

The description of the DMRS table can be similarly applied to other DMRS tables of the present invention unless otherwise described.

Below Table 28, and Table 29 shows an example of the DMRS of the table when the load f ront- DMRS of Type 1 configuration in that every two symbols ³ §.

[Table 28].

Table ^"29;

Table 30 below shows an example of the DMRS table when f ront-l oad DMRS of configuration type 2 is mapped to one symbol.

[Table 30]

#of

antenna port (s) # of symbols

layers

X 2 layer PO, case 1 / PO, case 2)

x + 1 2 layer P2, P3 (case 1) / P1, P4 (case 2) 1

x + 2 2 layer P4, P5 (case 1) / P3, P5 (case 2) 1 Tables 31 and 32 below show that the front-

And shows an example of a DMRS table when mapped.

[Table 31]

[Table 32]

<Proposal 3>^'

13 and 14 are views showing an example of a method of mapping an antenna port proposed in this specification to a resource element (RE).

Referring to FIGS. 13 and 14, a combination of one antenna port The included antenna ports could be mapped to specific REs according to certain rules.

Specifically, the DCI field can be defined in the DCI format as information about antenna ports, the number of layers, the number of symbols, and the like.

At this time, in the case of transmission of a specific layer (for example, 2, 3, ... layer, etc.), a combination of one antenna port can be defined for one state, Above can be defined.

The reference signal and the RE mapping method actually used for transmission of the data can be set in association with the QCL information between the DPG (and / or DMRS packets) and the RS set (and / or CSI-RS resources)).

The definition of the DCI field can be established in the base station and the UE. The UE can acquire information related to the number of the antenna port, the number of layers, and the number of symbols set through the DCI field transmitted through the control channel.

In the case of mapping the indent port to RE through such a method, only one antenna port combination is defined for one state, and the mapping method between the antenna port and the RE can be variably set according to the QCL information.

Therefore, multiplexing and RE mapping can be performed by selecting a specific method during multiplexing between SCGs in the SCG, so that the payload size of the DCI can be reduced.

Table 33 below shows an example of the mapping relationship between the antenna port and the RE when the configuration type of the DMRS is 1.

[5. 331 _.

In Table 33, p represents the index of the antenna port, Value.

13 (a) shows an example of a mapping between an antenna port and an RE for case 1 of proposal 3 and Table 33, and FIG. 13 (b) shows an example of case 2.

Table 34 below shows an example of the DMRS table when the configuration type of the DMRS for proposa l 3 is 1 and the DMRS is mapped to one symbol.

[Table 34]

Table 35 below shows an example of a DMRS table when the configuration type of the DMRS for proposa l 3 is 1 and f ront-l oad DMRS is mapped to two symbols.

[Table 35]

QCL information a. When the UE indicates a plurality of CSI-RS resources (that is, the reference signal indicates that the data and the data are transmitted from a plurality of _TRPs ), the UE transmits the reference symbol and data through the RE mapping method corresponding to _case 2 . &Lt; / RTI >

Or if the QCL information indicates a single CSI-RS resource, the UE can assume that the reference signal and data are transmitted through the RE mapping method corresponding to case 1. [

Table 36 below shows an example of the mapping relationship between the antenna port and the RE when the configuration type of the DMRS is 2. [Table 36]

14 (a) shows an example of the RE method for case 1 when the DMRS configuration type is 2, and (b) shows an example of the RE mapping method for case 2.

Table 37 below shows an example of the DMRS table when the configuration type of the DMRS for proposal 3 is 2 and the front-load DMRS is mapped to one symbol.

[Table 37].

Table 38 below shows an example of a DMRS table when the configuration type of the DMRS for proposal 3 is 2 and the front-load DMRS is mapped to two symbols.

[Table 38]

value message

antenna #of

# of layers

port (s) symbols

X 2 layer P0, PI 2 x + 1 2 layer P2, P3 2

x + 2 2 layer P4, P5 2

x + 3 2 layer P6, P7 2

x + 4 2 layer P8, P9 2

P10,

x + 5 2 layer 2

Pll

When the QCL information indicates a plurality of CSI-RS resources (that is, the reference signal indicates that the data is transmitted from a plurality of TRPs), the UE transmits the reference signal and data Lt; / RTI > is transmitted.

Or if the QCL information indicates a single CSI-RS resource, the UE can assume that the reference signal and data are transmitted through the RE mapping method corresponding to case 1. [ .

When transmission over a plurality of TRPs (ie, Comp (NCJT)) is considered in transmission of two or more layers, X representing the total number of transmission layers in the terminal viewpoint is xl , x2, so that the combination of the antenna ports can be variously set. ,

xl denotes the number of transport layers of TRP 1, x 2 denotes the number of transport layers of TRP 2, and can be set to the UE through higher layer signaling. Table 39 below shows an example where the values of xl and x2 constituting the total number of layers X are set to the UE through higher layer signaling according to the value of X.

[Table 39]

# of scheduled (# of ports in DPGl, # of ports in DPG2)

layers in total (v) in case when configured with up to 2-TRPNCJT

1 (1, 0)

2 (U), (2, 0)

3 (1, 2), (3, 0)

4 (1,3), (2,2), (4,0) 5 (1,4), (2,3), (5,0)

6 (2,4), (3,3), (6,0)

7 (3, 4), (7, 0)

8 (4, 4), (8, 0)

Different cases defined in the same V value in Table 39 are defined as different states, and a combination of transmission layers of various cases can be set to the UE at the same V value.

For example, if the value of V is 4 and the case is (1, 3), it means that one layer is transmitted in TRP 1 and three layers are transmitted in TRP 2.

That is, one layer may be transmitted through one antenna port in the DPG 1, and three layers may be transmitted through the three antenna ports in the DPG 2.

The total number of transport layers transmitted from the terminal to the terminal can be set dynamically through DCI signaling.

At this time, in the case of Comp (NCJT), since QCL relation is not established between layers transmitted in different TRPs, the antenna ports of the same SCG should not be mapped.

Therefore, by using the SCG described in Table 39, the xl layer and the x2 layer, which are set as the transmission layer of each TRP, as shown in Fig. 15, should be defined to be respectively set to the antenna ports of the antenna ports of different SCGs do.

In other words, the rules for setting up the actual number of antenna ports per DPG used to transmit signals and data from multiple SCGs should be defined.

This type of configuration, DMRS configuration type, front-ΐοξ! The number of DMRSs, the set value of NR-PQI, and the like can be considered.

For example, as shown in Fig. 15 when the two SCG is defined, each of the SCG is _(yi, y + l, yi + 2, yi + 3) and the ports _{(y! +4, y + 5} , yi + 6 , yi + 7) ports.

In this case, (y, yi + 1) port is set in DPG 1 associated with TRP a, and (y ^ 4) port is set in DPG 2 associated with TRP b. In addition, a method for setting the antenna ports per DPG used for transmission of the actual reference signal and data to some of the antenna ports of different SCGs is proposed.

16 and 17 are diagrams showing an example of a case where a terminal receives data from a base station to which the present invention can be applied.

16 (a) and 16 (b), when a reference signal and data are transmitted from the same TRP, in the conventional LTE, by using the definition of a DCI field composed of information on the number of antenna ports, It is possible to set the combination of ports appropriately.

However, when reference signals and data are transmitted from different T Ps as shown in FIGS. 17A and 17B, antenna ports used in each TRP must be mapped to different SCGs.

For example, in FIG. 17 (b), when TRP 1 uses DPG 1 and TRP 2 uses DPG 2, DPG 1 and DPG 2 must be mapped to different SCGs.

18 is a diagram illustrating an example of a mapping method between an antenna port and a resource element proposed in the present specification.

In FIG. 17: when reference signals and data are transmitted through the two TRPs described. In case of transmission through two TRPs, a rule for switching a specific antenna port among the antenna ports defined in the DMRS table to another SCG is set By doing so, TRP 1 and TRP 2 can perform transmission using all the different ports in different networks. :,. .

Table 18 below shows an example of the rule for the case where the configuration type of the DMRS is 1 and the frame rate DMRS is transmitted on 2 symbols.

[Table 40].

value message

# # of layers antenna port (s) # Qf symbols

X 2 layer P0, PI 2

x + 1 2 layer P2, P3 2

x + 2 2 layer P4, P5 2 x + 3 2 layer P6, P7 2

x + 4 3 layer PO, PI, P4 2

x + 5 3 layer P2, P3, P6 2

x + 6 4 layer PO, P1, P4, P5 2

x + 7 4 layers P2, P3, P6, P7 2

In case of 4 layer transmission, single TRP transmission can be set to terminal by PO, PI, P4, P5 (x + 6) or P2, P3, P6, P7 (x + 7) through DCI signaling. It may not be set.

However, the double TRP transmission can be set to the terminal by PI signal, P4, P5, (x + 6) or P2, P3, P6, P7 (x + 7) through band signaling. In this case, Can be defined.

(L x2) is set to (2, 2)

- If the SCG is defined as antenna ports multiplexed on the frequency axis by the CDM method, the combination of antenna ports can be mapped to two SCGs, so the port index can be applied as is (eg PQ, 1, P4 and P5 are SCG 2)

- When SCG is defined as antenna ports multiplexed on the time axis and frequency axis by the CDM method, a specific rule is required to map with another SCG because the combination of antenna ports is mapped to one SCG.

Hereinafter, a specific rule will be described.

The DCI field may be defined in the DCI format as information about antenna ports, the number of layers, the number of symbols, and the like. At this time, the combination of the antenna ports can be defined as a combination of the antenna ports with respect to the number of layers that increase in the SCG to fill the index first.

The terminal may then recognize different combinations of antenna ports in a particular state in association with the QCL information between the DPG (and / or DMRS ports) and the RS set (and / or CSI-RS resources).

For example, if the QCL information indicates a plurality of CSI-IS resources (i.e., indicates that data is to be transmitted from a plurality of TRPs) The combination of antenna ports can be mapped in the SCG including the corresponding index from the index of the antenna port having the lowest index set in the UE.

At this time, the total number of antenna ports mapped is equal to the number of transmission layers of the corresponding TRP set by the upper layer.

The combination of the antenna ports included in the second DPG can be mapped in the hiding SCG from the port index having the lowest index in the second SCG.

The definition of the DCI field can be predefined between the base station and the answer, and the terminal can obtain information related to the antenna port, the number of layers and the number of symbols through the DCI field transmitted over the control channel.

For example, in Table 40, if the terminal has set a state corresponding to (x + 6) (PO, PI, P4, P5), the terminal assumes that the number of transport layers of TP 1 2 is set to 2 and ² , respectively .

In addition, the UE can assume that this SCG 1 PO, PI, P4, consists of Ρ5 ^·, SCG 2 that is composed of Ρ2 eu Ρ3, Ρ6, Ρ7.

In this case, _the. The combination of the antenna ports of DPG 1 corresponding to TRP.1 can be set to PO, P1 and the combination of antenna ports of DPG 2 to TRP 2 can be set to Ρ2, Ρ3. ^

In the case of considering MU-MIMQ in the double transmission situation, whether or not the antenna ports of each SCG are mapped to each DPG and set to the UE depends on the situation of MU paring.

. Therefore, the base station must explicitly inform the terminal about the combination of antenna ports set to each terminal.

As a result,. In the case of MU-MIM0 in the Comp situation, it is necessary to define a rule between the base station and the terminal that can clearly indicate the combination of the antenna ports set to the terminal by the DPG among the antenna ports of the SCG. .

Hereinafter, in the context of the present invention, a base station capable of clearly indicating a combination of antenna ports set to a mobile station by a DPG among antenna ports of the SCG Proposed rules to be established between terminals.

A DCI field consisting of information on the total number of transport layers for the UE in the DCI format, a DCI field indicating a specific port in the SCG, and / or a mut The DCI indicator indicating whether or not the DCI is in use can be defined.

The definition of DCI f i eld is predefined between the BS and the UE, and the UE can acquire the information set by the BS through the DCI field transmitted through the control channel.

Table 41 below shows an example of a DCI field composed of information on the total number of transport layers.

[Table 41].

In Table 41, the terminal may be aware of codeword (CW) information through other information.

The example of the DCI field shown in Table 41 defines four states, and the number of transport layers of the UE can be set according to the value indicated by the base station through the DCI format to the UE.

For example, if a value of 3 is indicated to the UE through the DCI field of Table 41, the UE can recognize that three layers are periodically transmitted in a single CW and seven layers are transmitted in a double CW.

Tables 42 through 44 below show an example of a DCI field indicating a specific antenna port in the SCG when the configuration type of the DMRS is 1.

[Table 42]. P? (K ')

k '= 0 k' = \ r = o I '= \

1000 0 +1 +1 +1 +1

1001 0 +1 -1 +1 +1

1002 1 +1 +1 +1 +1

1003 1 +1 -1 +1 + 1

1004 0 +1 +1 +1 -1

1005 0 +1 -1 +1 -1

1006 1 +1 +1 +1 -1

1007 1 ^' +1 -1 +1 -1

[Table 43]

An antenna port indicated in a specific state in Tables 42 to 44 may be set to the start port index of the DPG in association with the corresponding SCG.

The examples of Table 43 and Table 44 define four states, and the value that the BS indicates to the UE may be the start port index of the combination of antenna ports transmitting the reference signal and data in the DPG associated with the corresponding SCG have.

(I.e., meaning that the index of the indicated antenna port is the lowest index). - The antenna ports can be set to the terminal as many as the number of layers allocated in the SCG It is.

The number of allocated layers can be established between the base station and the terminal via upper layer signaling and / or DCI signaling.

For ^'example, if the value of the table 41 3 indicated to the UE by the base station (in the case of s ingl e CT), the number of layers allocated to DPG 1 is 3, the number of layers allocated to DPG 2 is 1, the antenna port index for each DPG can be defined as described below. In this case, if the base station instructs the terminal to SCG 1 in Table 43 and SCG 2 to 3 in Table 44, antenna ports PI, P4, P5 and P7 may be set in the terminal.

That is, the base station can dynamically set the antenna ports included in the SCG to the terminal according to the total transmission layer through the DCI field.

In other words, by defining a separate DCI field for each SCG, the base station can indicate to the terminal, respectively, the index of the port from which the mapping of the antenna port starts in each DPG associated with the SCG.

In this case, since the antenna port can be freely allocated to a plurality of terminals of the base station, it has a high degree of scheduling freedom. However, the payload size of the DCI increases by the number of SCGs _. Problem exists.

To overcome this problem, the antenna port can be defined with the same DCI field as in Table 45 below.

[Table 45]. _.

Even when the combination of the antenna ports is defined as shown in Table 45, in a case where the number of layers transmitted in each TRP is divided evenly in a plurality of layer transmissions (for example, when dividing four layers into two) There is an effect of reducing the limit of. This method can be equally applied to the configuration type 2 of the DMRS in Tables 46 to 5Q below.

_■ following Table 46 to Table 49 shows an example of the DCI fields, if the configuration of the other ¾ DMRS 2, indicating a specific antenna ports in the SCG.

[Table 46] P? (/ ')

k '= 0 k' = \ l '= 0 /' = I

1000 0 +1 +1 +1 +1

1001 0 +1 -1 +1 +1

1002 2 +1 +1 +1 + 1

1003 2 +1 -1 +1

1004 4 +1 +1 +1

1005 4 +1 -1 +1

1006 0 +1 +1 +1 -1

1007 0 +1 -1 +1 -1

1008 2 +1 +1 +1 -1

1009 2 +1 -1 +1 -1

1010 4 +1 +1 + 1 -1

101 1 4 +1 -1 +1 -1

[Table 47]

Table 50 shows this example in which antenna ports defined in Tables 47 to 49 are defined by the same DCI field.

[Table 50]

Table 51 below shows an example of a DCI field indicating whether to mutate an RE occupied by the antenna ports of the SCG that is not set in the UE. [Table 51]

If the terminal indicates the value of the DCI field of Table 51 by the base station, the terminal may perform muting on the RE occupied by another SCG.

Proposal 5 showed how to configure the actual DMRS and the antenna ports to transmit data in relation to the QCL information obtained from the DCI-signal.

Through the above, the antenna ports dynamically set to the UE can be variably set according to the Comp (NCJT) situation.

This method could be set to the terminal via higher layer signaling (e.g., RRC and / or MAC CE). That is, the base station can set the antenna set of the DPG used for the actual transmission to the terminal by higher layer signaling according to the total number of transmission layers from the viewpoint of the reply.

Table 52 below shows an example of this.

[Table 52]

Table 52 defines the antenna ports to be set per DPG in the corresponding state according to the number of each transmission layer. That is, antenna ports per DPG used for actual transmission can be set to the UE through higher layer signaling according to the total number of transmission layers from the terminal perspective. The number of transmission layers through the DCI can be set dynamically, and a combination of antenna ports used for actual transmission is set based on the information in Table 52 that is set in association with the number of the corresponding transmission layers through upper layer signaling . For example, if a 4-layer transmission to the terminal in Table 52 is set via DCI, the terminal may recognize that PQ, PI, P4 in DPG 1 can be set and P2 in DPG 2 can be set .

Table 52 shows an example in which the number of transmission layers of a honeycomb - one state is defined. A combination of a plurality of different antenna ports for the number of transmission layers can be set.

Table 53 below shows an example of this.

[Table 53]

In Proposal 5, the mapping relationship between DPG and SCG is not described in detail, but it can be assumed that a specific rule for mapping is set between base station and terminal.

In order to map the antenna ports constituting the SCG to the appropriate DPG according to the QCL information information, specific rules for the mapping relationship between the DPG and the SCG must be defined. <Proposa l 6> FIG. 19 is a diagram showing an example of a method of setting the antenna ports proposed in the present specification.

Referring to FIG. 19, a plurality of SCGs may be merged into one DPG.

Specifically, the mapping relationship between the DPG and the SCG may be established in the UE through higher layer signaling and / or DCI signaling, or may be defined in a fixed manner (or fixed manner) between the BS and the UE.

The antenna ports through which the actual data included in the DPG set in the UE are transmitted and received can be set to the antenna ports included in the ports constituting the SCG mapped to the DPG.

For example, as shown in FIG. 19, DPG 1 may be mapped to SCG 1 and SCG 2, and DPG. 2 may be mapped to SCG 3.

Table 54 below shows an example of the SCG for configuration type 1 of the DMRS.

[Table 54]

SCG 1 and SCG 2 in Table 54 may be composed of antenna ports multiplexed on the frequency axis and the time axis through the CDM method, and the mapping relationship with the DPG may be defined through a certain method between the BS and the MS.

For example, when two DPGs are set in the UE, DPG 1 can be mapped to SCG 1 and DPG 2 can be mapped to SCG 2.

Table 55 below shows an example of SCG for configuration type 2 of DMRS.

[Table 55]

SCG 1, SCG 2 and SCG 3 in Table 55 can be configured with antenna ports multiplexed on the frequency axis and the time axis through the CDM method, Layer signaling and / or DCI signaling. For example, when two DPGs are set for each of the terminals 1, 2, and 3, DPG 1 and DPG 2 of the terminal 1 are mapped to SCG 1 and SCG 2, respectively, 2 are mapped to SCG 2 and SCG 3, respectively, and DPG 1 of the UE 3 can be set by SCG 1 and SCG 2 and DPG 2 is mapped to SCG 3 by upper layer signaling.

The mapping relationship between the DPG and the SCG can be established through a fixed method between the UE and the BS as described above.

For example, when two DPGs are set in the UE, if the number of layers set in the DPG is larger than the total number of antenna ports constituting one SCG, then DPG 1 is the layer allocated to DPG 1 from the SCG of the lowest index Can be mapped to an SCG that contains all the ports and ports that can support both the number of ports and the number of ports.

DPG 2 may be mapped to SCG including antenna ports capable of supporting the number of layers allocated to the DPG from the SCG having the index immediately following the SCG immediately following the SCG mapped to the DPG 1.

Table 56 is a table showing an example of mapping relationship between SCG and DPG.

. [Table 56]

For example, in Table 56, five layers are set for DPG 1, and three layers are set for DPG 2 _. DPG 1 can be mapped to SCG 1, SCG 2, and SCG 3, and DPG 2 can be mapped to SCG 4 and SCG 5.

The above method assumes that the number of SCGs is greater than the number of DPGs because different DPGs can not be mapped to the same SCG. This is because the QCL relationship must be established between the antenna ports constituting the same SCG.

Thus, in NR, conditions can be limited to support only environments where the number of DPGs is less than or equal to the number of SCGs.

If these constraints are defined for all base stations and terminals, It is not necessary to define or implement a separate operation to be performed by the base station and the terminal, so that the complexity of the implementation is reduced and the communication standard can be defined briefly.

Table 57 below shows an example of the mapping relationship between the DPG and the SCG when the number of DPGs in the configuration type 1 of the DMRS supports only the same or less number of SCGs.

[Table 57]

SCG 1 and SCG 2 in Table 57 can be composed of antenna ports multiplexed on the frequency axis and the time axis through the CDM method.

When defining the SCG as shown in Table 57, a total of two SCGs could be defined. In this case, the base station and the terminal can be limited to support only DPG transmissions of two DPGs (i.e., 2 T P Comp).

Table 58 below shows an example of the mapping relationship between the DPG and the SCG when the number of DPGs in configuration type 2 of the DMRS supports only the same or less number of SCGs.

[Table 58]

SCG 1 and SCG 2 of S.- 58 can be composed of antenna ports multiplexed on the frequency and time axes by the CDM method.

When defining the SCG as shown in Table 58, a total of three SCGs can be defined. In this case ^{: the} base station and the terminal may be limited to support only DPG transmissions below three DPGs (i.e., 3 TRP Comp).

This is the same as limiting that the configuration type 2 of the DMRS is applied when three or more DPGs are set (that is, in the case of Comp with three or more TRPs).

That is, in the case of 3 DPG, the configuration type 1 of the DMRS can be restricted from being used. In addition to these constraints, a 2 l ayer is used to reduce the segregation overhead. In the above transmission, only a multiplexing method using antenna ports between different SCGs can be applied. In this case, there is a disadvantage that the RS overhead becomes large, and the QCL condition (i.e., the antenna port multiplexed through the CDM method on the frequency axis must have a QCL relationship) for terminals receiving two or more DCIs Problems can arise.

Therefore, port multiplexing between SCGs and port multiplexing within SCGs should be considered together.

In the configuration type 1 of the DMRS, the front-load DMRS is mapped to one symbol. , If the 3-layer transmission is established in the specific PDCCH transmitted to the UE, the UE can assume that another PDCCH for the Comp (NCJT) transmission setup is not transmitted.

. That is, when at least the terminal is mapped to one symbol in the configuration type 1 of the MRS, the front-load DMRS is mapped. At the 2 TRP transmission, the number of layers from each TRP may not be set to (3, 1) or / and (1, 3), or only to (2, 2).

Configuration type 1 of DMRS is defined as DMRS pattern of IFDM type. In addition, if the front-load DMRS is mapped to one symbol, it can support a total of 4 layer transmissions ^

In this case, a maximum of 2 layers can be transmitted in one SCG. Therefore, when a 3-layer transmission is set to a UE through a specific PDCCH, the 2-layer and the SCG are different for a specific layer in the corresponding transmission state.

Therefore, in this situation, Comp (NCJT) set to double PDCCH can not be supported. The UE can assume that another PDCCH is not transmitted.

Section 6.3.3 of LTE Specification TS 36.211 defines a rule that performs inapping to different layers for modulation symbols ("com lex-valued modulation symbols") corresponding to each CW.

Section 6.3.4 of the LTE specification TS 36.211 defines precoding rules for mapping each layer to a different antenna pattern. In particular, Section 6.3.4.4 describes the case of using a UE-specific reference signal. When a UE-specific reference signal is used, the transmitter and the receiver do not share information about the actual precoder used. Therefore, as described in the specification below, each layer performs precoding transparent mapping to different antenna ports.

For transmission over a single antenna port, precoding can be defined by Equation (6) below.

&Quot; (6) "

Eu ^{_{^) (, ·) = χ}} (0) (, ·) pe {0,4,5,7,8, l 1,13,107,108,109,110} physical channel and / = 0, l, ... in the equation (6) ' / / _b I,

It means the number of the single antenna port used for the transmission of ^ = ^; i.

In addition, y ^(p) (i) denotes a complex-valued modulation symbol transmitted at the antenna port p, and x ⁽⁰⁾ (i) denotes a complex-valued modulation symbol corresponding to the 0th layer do.

When the upper layer parameter "dmrs-tableAlt" is set to 1 is used to set _Ρ = two-layer transmission ΐι eu {13} of the antenna port, free for the transmission on two antenna ports. The coding operation can be defined as Equation (7) below.

&Quot; (7) "

In Equation 7, / = 0,1, ..., A - 'and C ,, = M.

. A set of upper layer parameters ᄋ J 'semiOpenLoop "set to 1 and antenna _port. When used for the tank = 2 transmit landscape. Coding operation for transmission in the two antenna ports can be defined as Equation (8) below .

[Equation .8]

P = 7 in the equation (8), = ^" mod2) / ² .

Otherwise, the set of antenna ports used is z ^ H. + S, and the antenna The precoding operation for transmission on the ports can be defined as: < EMI ID = 9.0 >

In Equation (9) _,? _{= 0} ,?,?, And _?.

At this time, in the example of the existing LTE standard, the antenna port and the layers can be mapped sequentially from the index (7, for example) of a specific antenna port in ascending order.

The mapping rules are defined separately for certain cases where the combination of ports is not applicable to {11, 13}.

In this regard, in the NR standardization technology currently under discussion, MU-MIM0, which is more extended than the existing LTE standard such as the DMRS pattern and the DMRS port described in FIGS. 8 to 10, is considered.

Based on the DMRS pattern and the DMRS port described in Figs. 13 (a) to 14 (a), when it is reflected that MU-MIM0, which is more extended than the existing LTE standard, is being processed in the clothes standardization technology currently under discussion A combination of antenna port and number of layers as shown in Table 59 below can be considered.

[Table59]

value message

# of layers antenna port (s) # of symbols

0 1 layer P0 I

1. 1 layer P I 1

2 1 layer P2 1

3 1 layer P3 1

4 2 layer P0 / P 1 1

5 2 layer P2 / P3 1

6 2 layer P0 / P2 1

7 3 layer P0 / P1 / P2 1

8 4 layer P0 / P1 / P2 / P3 1

9 1 layer PQ 2

10 1 layer P I 2

1 1 1 layer P2 2

12 1 layer P3 2 13 1 layer P4 2

14 1 layer P5 2

15 1 layer P6 2

16 1 layer P7 2

17 2 layer P0 / P1 2

18 2 layer P2 / P3 2

19 2 layer P4 / P5 2

20 2 layer P6 / P7 2

21 3 layer P0 / P1 / P2 2

22 3 layer P3 / P4 / P5 2

23 4 layer P0 / P1 / P2 / P3 2

24 4 layer P4 / P5 / P6 / P7 2

25 5 layer P0 / P1 / P2 / P3 / P4 2

26 6 layer P0 / P1 / P2 / P3 / P4 / P5 2

27 7 layer P0 / P1 / P2 / P3 / P4 / P5 / P6 2

28 8 layer P0 / P1 / P2 / P3 / P4 / P5 / P6 / P7 2

29 reserved reserved

30 reserved reserved

31 reserved reserved value In Table 59, the minimum antenna port combination among the antenna port combinations that can be set to the UE can be changed according to the combination set for the actual UE.

That is, existing. In the LTE specification, the lowest index among the antenna ports that can be set to the UE except for the special cases (eg, {11, 13}) is fixed to 7. Also, as the number of layers increases, the port indexes are incremented sequentially from 7 to define layer-mapping.

However, in the discussion of NR standardization, MU-MIM0, which is more extended than the LTE standard, is considered, so that combinations of antenna ports that can be set for the UE can be defined differently from the existing LTE standard.

For example, different antenna ports may be defined for the same number of layers. In Table 59, it can be seen that PO, P1, ..., P7 can be set for one layer.

. Also, .2. P0 / P2 may be set according to the condition that a combination of PQ / Pl, P2 / P3 is set for a layer, or ^ QCL must be established between CDM antenna ports

In the NR standardization, the antenna set to the layer group terminal set to the terminal Rules must be defined that can be properly mapped to ports.

Therefore, the present invention proposes a rule that can appropriately map the layer set to the terminal to the antenna port set to the terminal.

A base station adds a complex-valued modulation symbol generated from one or two codewords for data transmission to a terminal to a plurality of layers, and demodulates the demodulated reference signal so that the terminal can receive and demodulate the data transmitted by the base station. (E.g., a DMRS sequence) for transmitting a plurality of specific codes (e.g., a DMRS sequence) to a plurality of layers (S20010).

At this time, the base station may map a complex-valued modulation symbol and a plurality of specific codes generated from one or two code words to a plurality of layers according to a certain rule, and map the layer to a specific antenna port according to a certain rule (S20020 ).

Some rules for mapping complex-valued modulation symbols and specific codes generated from one or two triplets to a layer and mapping that layer to a specific antenna port are described below. In this manner, the base station can map a specific code for transmitting the demodulation reference signal to the layer.

The base station may be comprised of a processor, an RF unit and a memory, as shown in Figures 23 to 26 below, and the processor may include a plurality of specific codes (e.g., a DMRS sequence, etc.) Can be mapped to a plurality of layers.

At this time, the reporter station can map a plurality of specific codes to a plurality of layers according to a certain rule.

A base station maps a complex-valued modulation symbol and a specific code generated from one or two codewords to a plurality of layers and associates the layer with a specific antenna according to a certain rule _. Let's take a look at how to map to a port. <Proposal 8>

In the existing LTE specification, when the antenna port is set to the terminal, it is defined to be set to the terminal as many as the number of the set number of terminals starting from port 7. For example, if two layers are set, {7, 8}, and if three layers are set, the antenna port combination of {7, 8, 9} is set to the terminal.

When these rules are not applied, the case where {11, 13} is set in the terminal at the time of two-layer transmission is limited.

Therefore, in the existing LTE specification, when the {11, 13} is set as such, an out-of-layer-antenna antenna is defined as the antenna.

On the other hand, in the NR standardization standard, as described above, various combinations of antenna ports can be set for the UE while considering the extended MU-MIM0.

As a separate rule for all antenna port combinations, as defined separately for the layer-to-antenna port mapping rules for the antenna port combinations {11, 13} in the existing LTE standard, It can also be defined.

In this case, the rules for mapping layers to antenna ports can be complicated. Therefore, the present invention proposes a method that can more simply map an antenna port and a layer.

Specifically,. When precoding and / or precoding and non-transparent mapping of layers and antennas are performed, the number of layers set in the terminal is set to the number of layers set to the terminal in the order of the lowest index layer to the highest index layer. - Port-to-layer mappings can be performed.

At this time, the mapping between the layer and the antenna port can be mapped in a specific order according to the combination of antenna ports set for the UE through DCI signaling and / or higher layer signaling.

The specific order of the anchor-ports set in the terminal mapped to the ascending layer is defined in a fixed order between the base station and the terminal, or higher order signaling and / or DCI: And can be set to the terminal by the base station through signaling.

&Lt; Example 1 >

Equation (10) below shows an example in which a layer is mapped to an antenna port in ascending order according to a specific hiding.

&Quot; (10) "

In Equation (10), PO, ^, ..., ^ denotes an example of the ascending order of the indexes for combinations of antenna ports set for the UE through DCI signaling and / or higher layer signaling.

For example, when the terminal is to transmit the second layer Oro 1000, 1001, antenna port settings, _group. Respectively, corresponding to 1000 and 1001, respectively.

On the other hand, when 1QQ2 and 1003 are set for the UE in the 2-layer transmission,? ₀ ? Is set to 1002 and 1003, respectively.

Alternatively, a 1000 or 1002 antenna port may be set for the UE in two-layer transmission, where ρ ₀ ρ is multiplied by 1000 and 1002, respectively. In the conventional LTE standard, a mapping rule is defined by using a fixed antenna port index when mapping a layer and an antenna port.

In the case of such a mapping rule, there is a problem that a separate mapping rule must be defined according to each port combination when the difference between the port indexes is not uniform within the combination of the start point and / or the antenna port of the antenna port set to the terminal -. However, the present ^'embodiment, if the antenna port and the'll not fixed in the case of mapping the layer - the index of the antenna ports without using the index of the port, DCI signaling and / or the actual configuration to the UE via upper layer signaling Used D -. Therefore, even when the difference between the port indexes in the start point and / or antenna port combination of the antenna port index set to the terminal is not uniform, the same rule is applied without defining separate rules for each case, antenna You can map ports.

Therefore, the layer and the antenna port can be variably mapped according to the antenna port actually set in the terminal

&Lt; Example 2 >

Table 60 below shows an example in which a base station sets up a specific rule that a layer and an antenna port are mapped to a mobile station through upper layer signaling and / or DCI signaling.

[Table 60]

If layer2port_mapping ordering = 0 is set in the specific table in Table 60, the layer can be mapped to the antenna port according to Equation (11) below.

&Quot; (11) "

In Equation (11), pou denotes an example of an ascending order of the indexes for combinations of antenna ports set for the UE.

FIG. 21 is a diagram illustrating an example of a layer-to-port mapping method proposed in this specification; FIG.

Table 61 below shows an example of mapping between codewords and layers.

[Table 61]

As shown in the table, 1 CW can support 1, 2 3, and 4 layers, and 2 CW can support 5,. 6, and 8 layers.

At this time, in case of 2, different MCS can be set for each CW. Such In the case of MULTI-TRP transmission, channels from different TRPs are likely to have different l arge scales.

Therefore, the optimum MCS, l ayer number, etc. can be changed according to the TRP. In this case, different CWs can be mapped to each TRP so that the optimal MCS, l ayer number, etc. can be set.

On the other hand, in the NR, there is a condition that QCL should be established between the DMRS antenna ports multiplexed in the CDM in the frequency domain, and the DMR.S antenna ports in which the QCL condition is established can be set to the same DPG.

In the case of considering different CW transmissions in different TRPs, layers mapped from the same CW are mapped to a set ¾ antenna port with the same DPG, and mapped layers from different CWs are mapped to antenna ports set to different DPGs. Rule and signaling are required.

Therefore, when precoding fast and / or precoding non-temporal antennas are mapped to an antenna port, the number of antenna ports set to the terminal in ascending order from the lowest index layer to the highest index layer A layer-to-layer mapping can be performed.

At this time, the mapping between the layer and the antenna ports can be mapped to a specific hinge ^sequence, depending on the combination of the antenna ports allocated to the UE through the DCI signaling and / or higher layer signaling.

The specific order may be defined in a fixed order between the base station and the terminals, or may be set by the base station to the terminal through higher layer signaling and / or DCI signaling.

At this time, the mapping between the antenna port and the layer is performed by prioritizing the mapping with the layer according to the order set by the base station in the antenna ports set to the same DPG.

. Thereafter, when all the antenna ports in the DPG are mapped to the layer, the remaining antenna ports of the following DPGs can be mapped to the remaining layers through the same method.

For example, when five layers are set in the terminal, two layers (for example, l ayer # 0 and l ayer # 1) in CW 1 and three layers (for example, l ayer # 2, l replacement # 3, layer # 4) may be respectively mapped.

In FIG. 21, five ports (for example, 100Q, 1001, 1002, 1008, and 1004) can be set for 5-layer transmission to the terminal.

At this time, when DPG 1, DPG 1002 and DPG 1003 are respectively set as DPG 2, DPG 1, DPG 2, and DPG 3, the mapping between the layer and the antenna port can be performed as shown in Equation (12).

&Quot; (12) "

In the case where χ ⁽⁰⁾ (/) and χ ^(ι) (/) are mapped to CW 1, JC ⁽²⁾ , ⁽³⁾ , and X ⁽⁴⁾ p ₀ , p, can be _multiplied by 1002, 1003, respectively, and _Ρι , ρ ^ can correspond to 1000, 1001, and 1004, respectively.

In Proposal 9, the mapping between the antenna port and the layer is fixedly defined between the BS and the MS so that different mapping schemes are used according to the number of DPGs set in the MS, or is set to the MS by the BS through higher layer signaling and / or DCI signaling .

&Lt; Example 3 >

For example, if one and the same DPG are set for the UE, Embodiment 1 of proposal 8 can be applied.

More specifically., ^■ the mapping may be a yaw reumcha ^ for i teudeul antenna set to the MS defined as a fixed value between the base station and the terminal itdi between layers and the port as shown in Equation 13 below.

. [Equation 13]

/ VA "" / " represents an ascending order example of an index for a combination of antenna ports set up through DCI signaling and / or higher layer signaling.

For example, if the answer is set to 1Q00, 1001 antenna port with 2 layer transmission, A ⁾ .A corresponds to! 000, 10Q1, respectively. On the other hand, when two-layer transmission 1002 and 1003 are set for the UE, ^ρ ° ' ^ρ ι corresponds to 1002 and 1003, respectively.

Or, in a two-layer transmission, an antenna port of 1000 or 1002 may be set to the terminal, and ^Po ' ^p , is multiplied by 1000 or 1002, respectively.

For example, when two different DPGs are set in the UE, the mapping between the layer and the antenna port can be fixed between the base station and the UE in ascending order of the antenna port set for the UE in the antenna ports set to the same DPG have. In this case, DPGs different from each other can be defined to be sequentially mapped as shown in Equation (14) below.

&Quot; (14) "

.

L ^ v- ¹ 1]

yD ⁽ⁱ⁾ in equation (14) is Ρ'ο 'Λ-' Ρ, DCI signaling and / or the ascending i ndex for DPG 1 of the antenna port combination is set to the mobile station via higher layer ditch Special ¾ example of the order of . And " ... indicates an example of ascending order of the index of DPG 2 among the set of port-port combinations set to the UE through DCI signaling and / or upper layer signaling.

In this case, ^v is the total number of layers, ^v 'is the total number of layers allocated to DPG 1 May denote the total number of layers allocated to DPG 2, and the relationship v = v '+ may be established.

22 is a diagram illustrating an example of a method of defining a reference signal table according to a mapping method of a reference signal according to the present invention.

Specifically, the DMRS subset table (subset t ab i e) may be defined in association with the set values associated with the DMRS, and the DMRS table used by the terminal to interpret the actual DCI field may be a combination of the DMRS subset tables. The base station can set a specific DMRS table to the terminal that can be composed of the DMRS subset tables through higher layer signaling and / or band signaling.

The set values related to the DMRS are the DMRS configuration type, the offset number of the symbol index on the frequency axis of the f ront-load DMRS, the number of maximum antenna ports (and / or layers), the CDM / FDM applicability and / or the number of supportable antenna ports (and / or layers), and the like.

Table 62 below shows an example of the DMRS subset table when the DMRS is mapped as in FIG.

[Table 62]

DMRS OFDM symbol Supported offset index in configuration number of front-ports number frequency type load DMRS domain

DMRS subset Type 1 1 {1, 2} 0

table 0

DMRS subset Type 1 1 {1, 2} 1

table 1

DMRS subset Type 1 1 {3, 4} N / A

table 2

DMRS subset Type 1 2 {1, 2, 3, 4} 0

table 3

DMRS subset Type 1 2 {1, 2, 3, 4} 1

table 4

DMRS subset Type 1 2 {5, 6, 7, 8} N / A

table 5 In Table 62, each of the DMRS subset tables can be defined exclusively with respect to each other. That is, different DMRS subset tables can be defined so as not to have the same combination of port indexes.

When a DMRS table to be used for the analysis of the actual DCI field is set in the terminal, the corresponding DMRS table can be configured as a combination of the DMRS subset tables in Table 62. [

Tables 63 to 65 below show an example of the DMRS subset table.

[Table 63]

[Table 64]

[Table 65]

Table 63, Table 63, and Table 65 show examples of the DMRS subset table 0, the DMRS subset table 1, and the DMRS subset table 2 defined in Table 62, respectively.

In Table 62, "offset index in frequency domain" can be set in the DMRS subset table. Means the frequency domain offset value of the DMRS pattern at the port.

Table 66 below shows an example of the configuration of the DMRS table using the MRS subset table.

[Table 66]

state DMRS table configuration

DMRS_table_config = 0 DMRS subset table 0 DMRSjable_config = 1 DMRS subset table 1

DMRS_table_config = 2 DMRS subset table 0 + DMRS subset table 2

DMRS_table_config = 3 DMRS subset table 1 + DMRS subset table 2

DMRSJable_config = 4 DMRS subset table 0 + DMRS subset table 1 + DMRS subset table 2

DMRS_table_config = 5 DMRS subset table 3

DMR5jable_config = 6 DMRS subset table 4

DMRSjable ᅳ config = 7 DMRS subset table 3 + DMRS subset table 5

DMRS_table_config = 8 DMRS subset table 4 + DMRS subset table 5

DMRSjable_config = 9 DMRS subset table 3 + DMRS subset table 4 + DMRS subset table 5 Table 66 shows an example of the configuration of the DMRS table for setting the DMRS table to be used for analyzing the actual DCI field I will indulge.

For example, if DMRS_talpl e_conf ig = 2 is set for a particular word, then the DMRS table can consist of a combination of DMRS ^, subset t able 0, and DMRS subset t ab le 2, Table 67 shows.

[Table 67] ^"

table. 6 _. 6 defines specific parameters and defines different DMRS table configurations for the corresponding parameters.

The other way of setting the DMRS table is to set the information to the terminal in bi-map format.

For example, each bi t constituting the bi tmap indicates whether the DMRS subset table is applied or not, and when the corresponding bit is set to 0, it means that the corresponding DMRS subset table is not used for the configuration of the DMRS table, 1, it may be used for the configuration of the DMRS table.

For example, the bi tmap for configuring the DMRS table can be constructed as follows DMRS subset table 1, DMRS subset table 2, DMRS subset table 3, DMRS subset table 4, DMRS subset table 5}

When the bitmap for configuring the DMRS table is set to {1.1.1.0.0.0}, the DMRS table for the set bitmap can be configured as shown in Table 68. [

[Table 68]

In Proposal 10, the configuration of the combination of the DMRS subset tables for a specific UE can be configured considering UE capability and / or MIJ ᅳ paring information such as the maximum number of layers (and / or antenna ports) and the like.

For example, in case of a terminal which can not transmit 3 or more layers due to a channel environment error, it is possible to configure a DMRS table by configuring the DMRS table only with the maximum number of layers of the DMRS subset.

With this method, the DCI overhead required for signaling to the terminal can be reduced. Also, in case of considering MU-paring information (for example, a DMRS table composed of a DMRS subse table having different values of " offset index in requency domain " is set for different terminals) : You can perform MU ᅳ paring between different terminals while reducing the required DCI overhead.

It is obvious that DL / UL is applicable for all cases where DL or UL is not specified to limit the application of technology to DL or UL even if Proposal 1 to 10 shows only DL or UL. Apparatus to which the present invention may be applied

23 illustrates a block diagram of a wireless communication device to which the methods proposed herein may be applied.

Referring to FIG. 23, the wireless communication system includes a base station 2310 and a plurality of terminals 2320 located in a base station 2310 area.

The base station and the terminal may each be represented by a wireless device.

The base station 2310 includes a processor 2311, a memory 2312 and a radio frequency module 2313. Processor 2311 implements functions, processes, and / or methods that were previously suppressed in FIGS. 1-23. The layers of the air interface protocol may be implemented by a processor. Memory 2312 is coupled to the processor and stores various information for driving the processor. RF modulations 2313 are coupled to the processor to transmit and / or receive wireless signals.

Terminal 2320 includes a processor 2321, a memory 2322, and RF modems 2323. . Processor 2321 implements the functionality, procedures and / or methods suggested in FIGS. 1-22. The layers of the air interface protocol may be implemented by a processor. Memory 2322 is coupled to the processor to store various information for driving the processor. RF modulations 1923 are coupled to the processor to transmit and / or receive wireless signals.

Memory (2312, 2322) may be internal or external to the processor (2311, 2321), as _well. And can be connected to various known means Oro processors 2311 and 2321.

Also, the base station 2310 and / or the terminal 2320 may have one antenna or multiple antennas. 24 illustrates a block diagram of a communication device according to an embodiment of the present invention. In particular, Fig. 24 is a view illustrating in more detail the above-described fence of Fig. 24, the terminal may include a processor (or a digital signal processor (DSP) 2410, an RF module (or RF unit) 2435, a power management module e) 2405, an antenna 2440, a battery ² 455, a di spl ay 2415, a keypad 2420, A memory 2430, a SIM (Subscriber Identification Module) card 2425 (this configuration is optional), a speaker 2445 and a microphone 2450, . A terminal may also include a single antenna or multiple antennas.

Processor 241Q implements the functions, processes and / or methods suggested in Figures 11-22. The layer of the air interface protocol may be implemented by a processor.

Memory 2430 is coupled to the processor and stores information related to the operation of the processor. Memory 2430 may be internal or external to the processor and may be coupled to the processor by various well known means.

The user, for example, press a button on the keypad (2420), or (or the touch and are you ^■) or enter the command information such as a telephone number by voice activation (voice activation), using a microphone 2450. The processor receives such command information and processes it to perform appropriate functions, such as dialing a telephone number. Operational data could be extracted from the sim card 2425 or from the memory 2430. A processor may also be implemented if user ¾ and also the command information or the drive for _convenience: the _information. And can be displayed on the display 2415.

The RF modules 2435 are coupled to the processor and receive and / or receive RF signals. The processor is an example to initiate the communication instance, and transmits a radio signal which forms the voice communication _data. The specific command information sent to the RF modeul undercoating. RF modems are composed of a receiver and a transmitter to receive and transmit radio signals. The antenna 244Q functions to transmit and receive a radio signal. When receiving a radio signal, the F module can forward the signal for processing by the processor and convert the signal to baseband. The processed signal may be converted into audible or readable information output via the speaker 2445. [ 25 is a diagram illustrating an example of RF mosques of a wireless communication device to which the method proposed in this specification can be applied. Specifically, FIG. 25 shows an example of RF models that can be implemented in an FDD (Frequency Division Duplex) system.

First, in the transmission path, the processor described in FIGS. 24 and 25 processes the data to be transmitted and provides an analog output signal to the transmitter 2510.

Within the transmitter 2510, the analog output signal is filtered by a low pass filter (LPFK 2511) to remove images caused by a digital-to-analog conversion (ADC) And amplified by a variable gain amplifier (VGAK2513). The amplified signal is filtered by a filter 2514 and amplified by a power amplifier (PAK2515) Amplified and routed through the duplexer (s) 2550 / antenna / switch (s) 2560, and transmitted via the antenna 2570.

In addition, in the receive path, the antenna 2570 receives all of the signals from the outside and provides the received signals, which are routed through the antenna switch (s) K256Q / duplexers 2550 and sent to the receiver 2520 Provided D -.

Within the receiver 2520, the received signals are amplified by a Low Noise Amplifier (LNAK 2523), filtered by a bandpass filter 2524 and amplified by a down converter (Mixer) 25 from RF to baseband Down conversion.

. The down-converted signal is filtered by a low-pass filter (LPF) 2526 and amplified by VGA 2527 to obtain an analog input signal, which is provided to the processor described in Figures 12 and 13 .

A local oscillator (L0) generator 2540 also generates and provides transmit and receive L0 signals to the forward converter 2512 and the down converter 2525, respectively. - Also,. Phase: A PLL 2530 receives control information from the processor to generate both transmit and receive L0 signals at appropriate frequencies and sends control signals to the U generator 254Q to provide..

. Further, the circuits shown in Fig. 25 may be arranged differently from the configuration shown in Fig. 26 is a diagram illustrating another example of RF models of a wireless communication apparatus to which the method proposed herein can be applied

Specifically, FIG. 26 shows an example of RF models that can be implemented in a TDD (Time Division Duplex) system.

The RF mos transmitter 2610 and receiver 2620 in the TDD system are identical to the RF mos transmitter and receiver structures in the FDD system.

Hereinafter, RF mosques of the TDD system will be described with respect to a structure that differs from the RF module of the FDD system, and the same structure will be described with reference to FIG.

The signal amplified by the power amplifier of the transmitter (PAK 2615) is routed through a band select switch (Band Select Switch) 2650, a band pass filter (BPF) 2660 and an antenna switch (s) (2680). &Lt; / RTI >

In addition, in the enhanced path, antenna 2680 receives signals from the outside and provides received signals that are coupled to antenna switch (s) 2670, band-pass filter 2660, and band select switch 2650, and provided to the receiver 2620, The above-described embodiments illustrate that the components and features of the present invention are combined in a predetermined form. Each component or feature shall be considered optional unless otherwise expressly stated. Each component or feature may be implemented in a form that is not combined with other components or features. It is also possible to construct embodiments of the present invention by combining some of the elements and / or features. The nature of the operations described in the embodiments of the present invention may vary. Some configurations or features of certain embodiments may be embodied with other embodiments, or may be replaced with other embodiments or features of other embodiments. It is clear that the claims that are not expressly cited in the claims may be combined to form an embodiment or be included in a new claim by an amendment after the application.

Embodiments in accordance with the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of hardware implementation, an embodiment of the present invention may include one or more (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGA programmable gate arrays, processors, Microcontroller, microprocessor, or the like.

In the case of a firmware or software implementation, an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like that performs the functions or operations described above. Software code can be stored in memory and driven by the processor. The memory is located inside or outside the processor and can exchange data with the processor by various means already known.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential characteristics thereof. Accordingly, the foregoing detailed description is to be considered in all respects illustrative and not restrictive. The scope of the invention is determined by reasonable interpretation of the appended claims ^doeeoyi: and all modifications within the equivalent scope of the invention are included within the scope of the invention.

Further, it has been described by dividing the gig drawing for convenience of description, which is described in the _drawings. Examples. It is also possible to combine to design a new embodiment. It is also within the scope of the present invention to design a computer-readable recording medium in which a program for executing the previously described embodiments is recorded according to the needs of those skilled in the art.

The method of transmitting and receiving a reference signal according to the present invention can be applied to a case where the configuration and method of the embodiments described above are not limitedly applied, Or some of the groups may be optionally constructed in combination.

Meanwhile, the method for transmitting / receiving a reference signal in the present specification is a method for transmitting / receiving a reference signal to / from a recording medium readable by a processor included in a network device It is possible to implement. The processor-readable recording medium includes all kinds of recording devices that are data-based and can be read by the processor. Examples of the recording medium readable by the processor include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and also implemented as a carrier wave such as transmission over the Internet . A processor ^group, gitok readable medium is coupled to the network ¾ distributed in a computer system, a processor-readable code in the stored and executed in a distributed fashion.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention.

In this specification, both the invention and the invention of the method are described, and the description of the two inventions can be supplemented as necessary.

[Industrial applicability]

Although the RRC connection method in the wireless communication system of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system, it can be applied to various wireless communication systems other than the 3GPP LTE / LTE-A system.

Claims

[Claims]

[Claim 1]

A method of operating a terminal in a wireless communication system,

Receiving downlink control information (DCI) from a base station,

The downlink control information includes resource information related to a resource to which a first reference signal is transmitted, port combination information related to a combination of at least one antenna port through which a second reference signal is transmitted, And Quas i Co-Location (QCL) information between channels through which a second reference signal is transmitted; Large

Receiving the second reference signal on a single-antenna port based on the DCI,

Wherein the at least one antenna port is included in a specific antenna port group based on the resource information,

Wherein the specific antenna port group includes antenna ports multiplexed through the same multiplexing scheme.

[Claim 2]

The method according to claim 1,

Wherein the antenna ports included in the specific antenna port group satisfy a QCUQuas i Co-Locate on relationship.

Claim 3

The method according to claim 1,

The at least one antenna port is mapped to a specific resource element (RE) based on the QCL information,

Wherein the combination of the at least one antenna port is dependent on the QCL information.

[4]

The method according to claim 1,

The second reference signal is transmitted from a plurality of base stations,

Wherein the resource information indicates the number of resources allocated from each of the plurality of base stations.

[Claim 5]

5. The method of claim 4,

Wherein the at least one antenna port is configured based on a combination of antenna ports included in the specific antenna port group.

[Claim _6]

5 _. As a result,

The'll ^not, at least one case that map with the layer, wherein the at least one of the combination of the antenna ports, the antenna port included in the specific antenna port group of one or more antenna port group corresponding to the port to a specific codeword Are mapped first,

Wherein the high-bay or higher-order antenna port groups are each composed of antenna ports multiplexed through the same multiplexing method.

7.

Article _. 4,

Wherein the coordination of the antennas and the antennas is made by the base station with the antenna ports selected from the one or more antenna port groups,

Wherein the single-input DCI further comprises transmit information for each of the single-selected antenna ports. . .

8.

The method according to claim 1, Wherein the sinking DCI further comprises muting information associated with whether to mutate a resource element occupied by an antenna port group that is not assigned to a single-terminal terminal.

[Claim 9]

The method according to claim 1,

The DCI may include information related to the number of the at least one antenna ports, symbol information related to the number of the second reference signaler and the mapped symbols, and / or layer information related to the number of layers to which the at least one antenna ports are mapped &Lt; / RTI >

Claim 10

A method of operating a base station in a wireless communication system,

Transmitting downlink control information (DCI) to the UE,

The downlink control information includes resource information related to a resource to which the first reference signal is transmitted, port hopping information related to a combination of at least one antenna port through which a second reference signal is transmitted, And a QCUQuas i Co-Locate information of a channel through which the second reference signal is transmitted; And

And transmitting the second reference signal to the terminal via at least one antenna port of the first base station based on the DCI,

Claim 11

11. The method of claim 10,

A plurality of specific codes for transmitting the first-second reference signal and a complex- Mapping a symbol to a plurality of layers (l ayer); And

And mapping the plurality of layers to the at least one antenna port.

Claim 12

12. The method of claim 11,

Wherein the combination of the at least one antenna port is comprised of antenna ports included in a group of different pressure ports of the one or more antenna port groups and wherein the antenna ports are coupled to at least one layer The combination of the at least one antenna port is preferentially mapped to antenna ports included in the specific antenna port group of one or more antenna port groups,

Wherein the one or more antenna port groups are each composed of antenna ports multiplexed through the same multiplexing method.

[13]

In a terminal of a wireless communication system,

A communication unit for transmitting and receiving a radio signal from outside; _. And

And a processor operatively coupled to the communication unit,

Receiving downlink control information (DCI) from the base station,

. The downlink control information includes resource information related to a resource to which a first reference signal is transmitted, port combination information related to a combination of at least one antenna port to which a second reference signal is transmitted, And QCUQuas i Co-Locat ion information between the channel to which the second reference signal is transmitted, and to the first DCU. On the basis of the number of antennas, ^"I'll complaining ^■ at least one of the ports are not the basis of the resource information is contained in a particular antenna port group,