WO2020138984A1

WO2020138984A1 - Method for operating terminal and base station in wireless communication system, and apparatus supporting same

Info

Publication number: WO2020138984A1
Application number: PCT/KR2019/018530
Authority: WO
Inventors: 이길봄; 김기준; 강지원; 김규석
Original assignee: 엘지전자 주식회사
Priority date: 2018-12-27
Filing date: 2019-12-26
Publication date: 2020-07-02

Abstract

Disclosed are a method for operating a terminal and a base station in a wireless communication system, and an apparatus supporting the method. A terminal according to an applicable embodiment of the present invention is configured, by a base station, with a transmission mode in which data generated from the same information is transmitted by means of two physical downlink shared channels (PDSCHs), acquires information for acquiring data by means of a plurality of PDSCHs from downlink control information (DCI), and on the basis thereof, acquires data by means of the plurality of PDSCHs.

Description

Method of operating a terminal and a base station in a wireless communication system and a device supporting the same

The following description relates to a wireless communication system, in a wireless communication system, a terminal and a base station operating method related to an operation of acquiring data information based on the same information through two physical downlink shared channels (PDSCHs) and supporting the same It is about the device.

Wireless access systems have been widely deployed to provide various types of communication services such as voice and data. Generally, a wireless access system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of the multiple access system include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency (SC-FDMA). division multiple access) system.

In particular, as more communication devices require a larger communication capacity, an improved mobile broadband communication technology has been proposed compared to a conventional radio access technology (RAT). In addition, a communication system that considers services/UEs sensitive to reliability and latency as well as massive machine type communications (MTC) that provides a variety of services anytime, anywhere by connecting multiple devices and objects has been proposed. Accordingly, enhanced mobile broadband communication, massive MTC, and ultra-reliable and low latency communication (URLLC) have been introduced, and various technical configurations have been proposed for this.

The present disclosure provides a method of operating a terminal and a base station in a wireless communication system and devices supporting the same.

The technical objectives to be achieved in the present disclosure are not limited to the above-mentioned matters, and other technical problems not mentioned are common knowledge in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure to be described below. Can be considered by those who have

The present disclosure provides a method of operating a terminal and a base station in a wireless communication system and apparatuses therefor.

As an example of the present disclosure, in a method of operating a terminal in a wireless communication system, from a base station, (i) includes two transmission configuration indicators (TCI) states, and (ii) one transmission Receiving downlink control information (DCI) including information for a transport block (TB); Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) from the base station; Based on the DCI and the configuration information, it is assumed that (i) data reception on the two PDSCHs is scheduled by the DCI, and (ii) data received on the two PDSCHs is based on the same information; Based on the assumption, from one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first demodulation reference signal for a first PDSCH of the two PDSCHs DMRS) port information, and (ii) obtaining second MCS and second DMRS port information for a second PDSCH among the two PDSCHs; And acquiring data information through the two PDSCHs based on the obtained information.

In the present disclosure, the operation method of the terminal may further include receiving, from the base station, higher layer signaling setting the maximum number of codewords scheduled by one DCI to 1.

In the present disclosure, the second MCS, the first DMRS port information, and the second DMRS port information may be obtained from one field in the DCI.

In this case, it may be an antenna ports field in the DCI.

In the present disclosure, the first DMRS port information and the second DMRS port information obtained from the one field may be different based on the two PDSCHs received on the same resource.

In this case, the first DMRS port information and the second DMRS port information may be included in different Code Division Multiplexing (CDM) groups.

In this case, the first DMRS port information and the second DMRS port information may be jointly encoded and obtained from the one field.

For example, the second MCS may be obtained from one or more bits, not bits related to the first DMRS port information and the second DMRS port information, among a plurality of bits in the one field.

In the present disclosure, based on the two PDSCHs received on different resources, the first DMRS port information and the second DMRS port information obtained from the one field may be the same.

In the present disclosure, the terminal can expect that the maximum number of layers to which the two PDSCHs are transmitted is set to one.

In the present disclosure, the two PDSCHs may be received from different transmission reception points (TRPs), respectively.

As another example of the present disclosure, a terminal operating in a wireless communication system, comprising: at least one transmitter; At least one receiver; At least one processor; And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, the specific operation being: from a base station. , (i) downlink control information including two transmission configuration indicator (TCI) states, and (ii) information for one transport block (TB). information; DCI); Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) from the base station; Based on the DCI and the configuration information, it is assumed that (i) data reception on the two PDSCHs is scheduled by the DCI, and (ii) data received on the two PDSCHs is based on the same information; Based on the assumption, from one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first demodulation reference signal for a first PDSCH of the two PDSCHs DMRS) port information, and (ii) obtaining second MCS and second DMRS port information for a second PDSCH among the two PDSCHs; And acquiring data information through the two PDSCHs based on the obtained information.

In the present disclosure, the terminal may communicate with at least one of a mobile terminal, a network, and an autonomous vehicle other than a vehicle including the terminal.

As another example of the present disclosure, a base station operating in a wireless communication system, comprising: at least one transmitter; At least one receiver; At least one processor; And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, wherein the specific operation is: to a terminal. , (i) downlink control information including two transmission configuration indicator (TCI) states, and (ii) information for one transport block (TB). providing information; DCI); Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) to the terminal; And based on the DCI and the configuration information, transmitting data information to the terminal through the two PDSCHs, data reception on the two PDSCHs is scheduled by the DCI, and the two PDSCHs. The data received through is based on the same information, and based on one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first for a first PDSCH among the two PDSCHs; A demodulation reference signal (DMRS) port information, and (ii) a second MCS and second DMRS port information for a second PDSCH among the two PDSCHs are disclosed.

The above-described aspects of the present disclosure are only some of preferred embodiments of the present disclosure, and various embodiments in which the technical features of the present disclosure are reflected are detailed by the person skilled in the art to be described below. It can be derived and understood based on description.

According to embodiments of the present disclosure has the following effects.

According to the present disclosure, the base station can provide the terminal with MCS and DMRS port information for data information transmitted through a plurality of PDSCHs, and correspondingly, the terminal acquires data information through the PDSCHs based on the information. can do.

Through this signaling operation, although the maximum number of codewords scheduled by one DCI by the base station is set to 1, the terminal acquires data information through a plurality of PDSCHs (eg, 2 PDSCHs). You can get all the information you need to do.

The effects obtainable in the embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned are applied in the technical field of the present disclosure from the following description of the embodiments of the present disclosure. It can be clearly drawn and understood by those with ordinary knowledge. That is, unintended effects of implementing the configuration described in the present disclosure may also be derived by those skilled in the art from the embodiments of the present disclosure.

The accompanying drawings are provided to help understanding of the present disclosure, and provide embodiments of the present disclosure together with a detailed description. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to constitute a new embodiment. Reference numerals in each figure refer to structural elements.

1 is a view for explaining a physical channel and a signal transmission method using them.

2 is a diagram illustrating a structure of a radio frame based on an NR system to which embodiments of the present disclosure are applicable.

3 is a diagram illustrating a slot structure based on an NR system to which embodiments of the present disclosure are applicable.

4 is a diagram illustrating a self-contained slot structure based on an NR system to which embodiments of the present disclosure are applicable.

5 is a diagram illustrating one REG structure based on an NR system to which embodiments of the present disclosure are applicable.

6 is a diagram briefly showing an example of a first loaded DMRS of the first DMRS configuration type according to the present disclosure.

7 is a view showing an example of a case in which time and/or frequency resources of two PDSCHs applicable to the present disclosure overlap.

8 is a diagram simply showing a single PDCCH system operation applicable to the present disclosure.

9 is a diagram briefly showing a configuration in which a terminal receives a PDSCH through two TRP/beam(s).

10 is a diagram briefly showing an operation example of a terminal and a base station applicable to the present disclosure (for example, objects including TRP #1 and TRP #2).

11 is a diagram briefly showing operations of a terminal and a base station according to an example of the present disclosure, FIG. 12 is a flowchart of operation of a terminal according to an example of the present disclosure, and FIG. 13 is an operation of a base station according to an example of the present disclosure It is a flow chart.

14 is a diagram briefly showing an operation example of a terminal and a base station applicable to the present disclosure (eg, objects including TRP #1 and TRP #2).

15 is a diagram briefly showing operations of a terminal and a base station according to an example of the present disclosure, FIG. 16 is a flowchart of operation of a terminal according to an example of the present disclosure, and FIG. 17 is an operation of a base station according to an example of the present disclosure It is a flow chart.

18 to 22 are diagrams illustrating examples of PRGs for each codeword according to the present disclosure.

23 to 25 are diagrams illustrating examples of PRGs for each codeword based on RV values according to the present disclosure.

26 is a diagram illustrating an example of slot allocation for each codeword applicable to the present disclosure.

27 is a diagram showing a time domain pattern of PT-RS applicable to the present disclosure.

28 is a diagram showing another example of PRG for each codeword according to the present disclosure.

29 is a diagram illustrating an example of a PRG configuration for each TRP according to the present disclosure.

30 is a diagram briefly showing an operation example of a terminal and a base station applicable to the present disclosure (eg, objects including TRP #1 and TRP #2).

31 is a diagram briefly showing operations of a terminal and a base station according to an example of the present disclosure, FIG. 32 is a flowchart of operation of a terminal according to an example of the present disclosure, and FIG. 33 is an operation of a base station according to an example of the present disclosure It is a flow chart.

34 is a diagram briefly showing an operation example of a terminal and a base station applicable to the present disclosure (eg, objects including TRP #1 and TRP #2).

35 is a diagram briefly showing operations of a terminal and a base station according to an example of the present disclosure, FIG. 36 is a flowchart of operation of a terminal according to an example of the present disclosure, and FIG. 37 is an operation of a base station according to an example of the present disclosure It is a flow chart.

38 illustrates a communication system applied to the present disclosure.

39 illustrates a wireless device that can be applied to the present disclosure.

40 shows another example of a wireless device applied to the present disclosure.

41 illustrates a portable device applied to the present disclosure.

42 illustrates a vehicle or autonomous vehicle applied to the present disclosure.

The following embodiments are combinations of elements and features of the present disclosure in a predetermined form. Each component or feature can be considered to be optional, unless expressly stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, embodiments of the present disclosure may be configured by combining some components and/or features. The order of the operations described in the embodiments of the present disclosure can be changed. Some configurations or features of one embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments.

In the description of the drawings, procedures or steps that may obscure the subject matter of the present disclosure are not described, and procedures or steps that are understandable at the level of those skilled in the art are not described.

Throughout the specification, when a part “comprising or including” a certain component, it means that other components may be further included instead of excluding other components unless otherwise specified. do. In addition, terms such as "... unit", "... group", and "module" described in the specification mean a unit that processes at least one function or operation, which is hardware or software or a combination of hardware and software. Can be implemented as In addition, "a (a or an)", "one (one)", "the (the)" and similar related terms in the context of describing the present disclosure (especially in the context of the following claims) is different herein. It may be used in a sense including both singular and plural unless indicated or clearly contradicted by context.

In the present specification, embodiments of the present disclosure have been mainly described in relation to data transmission and reception between a base station and a mobile station. Here, the base station has a meaning as a terminal node of a network that directly communicates with a mobile station. Certain operations described in this document as being performed by a base station may be performed by an upper node of the base station in some cases.

That is, various operations performed for communication with a mobile station in a network consisting of a plurality of network nodes including a base station may be performed by a base station or other network nodes other than the base station. At this time, the'base station' may be replaced by terms such as a fixed station, Node B, eNode B (eNB), gNode B (gNB), advanced base station (ABS), or access point. Can.

In addition, in the embodiments of the present disclosure, a terminal is a user equipment (UE), a mobile station (MS), a subscriber station (SS), a mobile subscriber station (MSS). , It may be replaced with terms such as a mobile terminal or an advanced mobile station (AMS).

Also, the transmitting end refers to a fixed and/or mobile node that provides a data service or a voice service, and the receiving end refers to a fixed and/or mobile node that receives a data service or a voice service. Therefore, in the uplink, a mobile station can be a transmitting end and a base station can be a receiving end. Likewise, in the downlink, a mobile station can be a receiving end, and a base station can be a transmitting end.

Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of the wireless access systems IEEE 802.xx system, 3GPP (3rd Generation Partnership Project) system, 3GPP LTE system, 3GPP 5G NR system and 3GPP2 system, In particular, embodiments of the present disclosure may be supported by 3GPP TS 38.211, 3GPP TS 38.212, 3GPP TS 38.213, 3GPP TS 38.321 and 3GPP TS 38.331 documents. That is, obvious steps or parts not described in the embodiments of the present disclosure may be described with reference to the documents. Also, all terms disclosed in this document may be described by the standard document.

Hereinafter, preferred embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION The detailed description set forth below, along with the accompanying drawings, is intended to describe exemplary embodiments of the present disclosure, and is not intended to represent the only embodiments in which the technical configuration of the present disclosure may be practiced.

Also, specific terms used in the embodiments of the present disclosure are provided to help understanding of the present disclosure, and the use of these specific terms may be changed into other forms without departing from the technical spirit of the present disclosure. .

Hereinafter, a 3GPP NR system will be described as an example of a radio access system in which embodiments of the present disclosure can be used.

The following technologies include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). It can be applied to various wireless access systems.

In order to clarify the description of the technical features of the present disclosure, embodiments of the present disclosure mainly describe a 3GPP NR system. However, the embodiments proposed in the present disclosure can be applied to other wireless systems (eg, 3GPP LTE, IEEE 802.16, IEEE 802.11, etc.).

1. NR 시스템1. NR system

1.1. 물리 채널들 및 일반적인 신호 전송1.1. Physical channels and general signal transmission

In a radio access system, a terminal receives information from a base station through downlink (DL) and transmits information to a base station through uplink (UL). The information transmitted and received by the base station and the terminal includes general data information and various control information, and various physical channels exist according to the type/use of the information they transmit and receive.

1 is a view for explaining a physical channel that can be used in embodiments of the present disclosure and a signal transmission method using them.

When the power is turned off again when the power is turned off, or newly entered the cell, the initial cell search operation, such as synchronizing with the base station, is performed in step S11. To this end, the terminal receives a primary synchronization channel (P-SCH: Primary Synchronization Channel) and a floating channel (S-SCH: Secondary Synchronization Channel) from the base station, synchronizes with the base station, and acquires information such as a cell ID.

Thereafter, the terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain intra-cell broadcast information.

On the other hand, the UE may check a downlink channel state by receiving a downlink reference signal (DL RS) in an initial cell search step.

Upon completion of the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S12, and a little more Specific system information can be obtained.

Thereafter, the terminal may perform a random access procedure (Random Access Procedure), such as steps S13 to S16, in order to complete the access to the base station. To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S13), and the RAR for the preamble through a physical downlink control channel and a corresponding physical downlink shared channel. Random Access Response) may be received (S14). The UE transmits a PUSCH (Physical Uplink Shared Channel) using scheduling information in the RAR (S15), and a collision resolution procedure such as reception of a physical downlink control channel signal and a corresponding physical downlink shared channel signal (Contention Resolution Procedure) ) Can be performed (S16 ).

After performing the above-described procedure, the UE receives the physical downlink control channel signal and/or the physical downlink shared channel signal (S17) and the physical uplink shared channel (PUSCH: Physical) as a general uplink/downlink signal transmission procedure. Uplink Shared Channel (PUCCH) signal and/or physical uplink control channel (PUCCH) signal transmission (S18) may be performed.

The control information transmitted by the terminal to the base station is collectively referred to as uplink control information (UCI). UCI is HARQ-ACK/NACK (Hybrid Automatic Repeat and reQuest Acknowledgement/Negative-ACK), SR (Scheduling Request), CQI (Channel Quality Indication), PMI (Precoding Matrix Indication), RI (Rank Indication), BI (Beam Indication) ) Information.

In the NR system, UCI is generally periodically transmitted through PUCCH, but may be transmitted through PUSCH according to an embodiment (eg, when control information and traffic data should be simultaneously transmitted). In addition, the UE may periodically transmit UCI through PUSCH by request/instruction of the network.

1.2. 무선 프레임 (Radio Frame) 구조1.2. Radio frame structure

The uplink and downlink transmission based on the NR system is based on the frame shown in FIG. One radio frame has a length of 10 ms, and is defined as two 5 ms half-frames (HFs). One half-frame is defined by 5 1ms subframes (Subframes, SFs). One subframe is divided into one or more slots, and the number of slots in the subframe depends on subcarrier spacing (SCS). Each slot includes 12 or 14 OFDM(A) symbols according to a cyclic prefix (CP). Normally, if CP is used, each slot contains 14 symbols. When an extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or DFT-s-OFDM symbol).

Table 1 shows the number of symbols per slot according to the SCS, the number of slots per frame, and the number of slots per subframe when the normal CP is used, and Table 2 shows the slot number according to the SCS when the extended CSP is used. It indicates the number of symbols, the number of slots per frame, and the number of slots per subframe.

In the above table, N ^slot _symb indicates the number of symbols in the slot, N ^{frame, μ} _slot indicates the number of _slots in the frame, and N ^{subframe, μ} _slot indicates the number of slots in the ^subframe .

In the NR system to which the present disclosure is applicable, OFDM(A) numerology (eg, SCS, CP length, etc.) may be set differently among a plurality of cells merged to one UE. Accordingly, a (absolute time) section of a time resource (eg, SF, slot, or TTI) composed of the same number of symbols (for convenience, collectively referred to as TU (Time Unit)) may be set differently between merged cells.

NR supports multiple numerology (or subcarrier spacing (SCS)) to support various 5G services. For example, when the SCS is 15 kHz, it supports a wide area in traditional cellular bands, and when the SCS is 30 kHz/60 kHz, it is dense-urban, lower latency. And a wider carrier bandwidth, and when the SCS is 60 kHz or higher, a bandwidth greater than 24.25 GHz is supported to overcome phase noise.

The NR frequency band is defined as a frequency range of two types (FR1, FR2). FR1, FR2 can be configured as shown in the table below. In addition, FR2 may mean millimeter wave (mmW).

One slot includes a plurality of symbols in the time domain. For example, in the case of a normal CP, one slot includes 7 symbols, but in the case of an extended CP, one slot includes 6 symbols.

The carrier includes a plurality of subcarriers in the frequency domain. Resource block (RB) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain.

BWP (Bandwidth Part) is defined as a plurality of contiguous (P)RBs in the frequency domain, and may correspond to one numerology (eg, SCS, CP length, etc.).

The carrier may include up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated for one terminal. Each element in the resource grid is referred to as a resource element (RE), and one complex symbol may be mapped.

In FIG. 4, a hatched area (eg, symbol index = 0) indicates a downlink control area, and a black area (eg, symbol index = 13) indicates an uplink control area. Other areas (eg, symbol index = 1 to 12) may be used for downlink data transmission or may be used for uplink data transmission.

According to this structure, the base station and the UE can sequentially perform DL transmission and UL transmission in one slot, and can transmit and receive DL data and transmit/receive UL ACK/NACK therein in one slot. As a result, this structure reduces the time it takes to retransmit data when a data transmission error occurs, thereby minimizing the delay in the final data transmission.

In this self-supporting slot structure, a type gap of a certain time length is required for the base station and the UE to switch from the transmission mode to the reception mode or from the reception mode to the transmission mode. To this end, some OFDM symbols at a time point of switching from DL to UL in an independent slot structure may be set as a guard period (GP).

In the foregoing detailed description, the case where the independent slot structure includes both the DL control area and the UL control area has been described, but the control areas may be selectively included in the independent slot structure. In other words, the free-standing slot structure according to the present disclosure may include a case in which both the DL control area and the UL control area are included as well as the case where both the DL control area and the UL control area are included as shown in FIG. 4.

Also, the order of the regions constituting one slot may vary according to embodiments. For example, one slot may be configured in the order of DL control area / DL data area / UL control area / UL data area, or may be configured in the order of UL control area / UL data area / DL control area / DL data area.

PDCCH may be transmitted in the DL control region, and PDSCH may be transmitted in the DL data region. PUCCH may be transmitted in the UL control region, and PUSCH may be transmitted in the UL data region.

In the PDCCH, downlink control information (DCI), for example, DL data scheduling information and UL data scheduling information may be transmitted. In the PUCCH, uplink control information (UCI), for example, ACK/NACK (Positive Acknowledgement/Negative Acknowledgement) information for DL data, CSI (Channel State Information) information, and SR (Scheduling Request) may be transmitted.

PDSCH carries downlink data (eg, DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAMK), 64 QAM, and 256 QAM Applies. A codeword is generated by encoding TB. PDSCH can carry up to two codewords. For each codeword, scrambling and modulation mapping are performed, and modulation symbols generated from each codeword are mapped to one or more layers (Layer mapping). Each layer is mapped to a resource together with a DMRS (Demodulation Reference Signal) and is generated as an OFDM symbol signal and transmitted through a corresponding antenna port.

The PDCCH carries downlink control information (DCI) and a QPSK modulation method is applied. One PDCCH is composed of 1, 2, 4, 8, and 16 control channel elements (CCEs) according to an aggregation level (AL). One CCE is composed of six Resource Element Groups (REGs). One REG is defined by one OFDM symbol and one (P)RB.

In FIG. 5, D denotes a resource element (RE) to which DCI is mapped, and R denotes RE to which DMRS is mapped. DMRS is mapped to the 1st, 5th, and 9th REs in the frequency domain direction within one symbol.

The PDCCH is transmitted through a control resource set (CORESET). CORESET is defined as a set of REGs with a given pneumonology (eg, SCS, CP length, etc.). Multiple CORESETs for one UE may overlap in the time/frequency domain. CORESET may be set through system information (eg, MIB) or UE-specific upper layer (eg, Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of symbols (up to 3) constituting the CORESET may be set by higher layer signaling.

PUSCH carries uplink data (eg, UL-shared channel transport block, UL-SCH TB) and/or uplink control information (UCI), and CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform Or, it is transmitted based on a DFT-s-OFDM (Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, if transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on the CP-OFDM waveform, and if transform precoding is possible (eg, transform precoding is enabled), the UE is CP-OFDM. PUSCH may be transmitted based on a waveform or a DFT-s-OFDM waveform. PUSCH transmission is dynamically scheduled by UL grant in DCI, or semi-static based on upper layer (eg, RRC) signaling (and/or Layer 1 (L1) signaling (eg, PDCCH)). Can be scheduled (configured grant). PUSCH transmission may be performed on a codebook basis or a non-codebook basis.

PUCCH carries uplink control information, HARQ-ACK and/or scheduling request (SR), and is divided into Short PUCCH and Long PUCCH according to the PUCCH transmission length. Table 4 illustrates PUCCH formats.

PUCCH format 0 carries UCI up to 2 bits in size, and is mapped and transmitted based on a sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one sequence among a plurality of sequences through PUCCH in PUCCH format 0. The UE transmits PUCCH in PUCCH format 0 in the PUCCH resource for setting the corresponding SR only when transmitting a positive SR.

PUCCH format 1 carries UCI with a size of up to 2 bits, and the modulation symbol is spread in the time domain by an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is performed). DMRS is transmitted on a symbol in which a modulation symbol is not transmitted (ie, time division multiplexing (TDM)).

PUCCH format 2 carries UCI having a bit size larger than 2 bits, and modulation symbols are transmitted through DMRS and Frequency Division Multiplexing (FDM). DMRS is located at symbol indices #1, #4, #7, and #10 in a given resource block at a density of 1/3. PN (Pseudo Noise) sequence is used for the DMRS sequence. For 2 symbol PUCCH format 2, frequency hopping may be activated.

PUCCH format 3 does not allow terminal multiplexing in the same physical resource blocks, and carries a UCI having a bit size larger than 2 bits. In other words, PUCCH resources in PUCCH format 3 do not include orthogonal cover codes. The modulation symbol is transmitted by DMRS and Time Division Multiplexing (TDM).

PUCCH format 4 supports multiplexing up to 4 UEs in the same physical resource block, and carries a UCI having a bit size larger than 2 bits. In other words, the PUCCH resource of PUCCH format 4 includes an orthogonal cover code. The modulation symbol is transmitted by DMRS and Time Division Multiplexing (TDM).

1.3. DCI 포맷1.3. DCI format

In the NR system to which the present disclosure is applicable, the following DCI formats can be supported. First, the NR system supports DCI format 0_0 and DCI format 0_1 as DCI formats for PUSCH scheduling, and DCI format 1_0 and DCI format 1_1 as DCI formats for PDSCH scheduling. In addition, as a DCI format usable for other purposes, the NR system may additionally support DCI format 2_0, DCI format 2_1, DCI format 2_2, and DCI format 2_3.

Here, DCI format 0_0 is used to schedule a transmission block (TB)-based (or TB-level) PUSCH, and DCI format 0_1 is a transmission block (TB)-based (or TB-level) PUSCH or (CBG (Code Block Group)) It may be used to schedule CBG-based (or CBG-level) PUSCH) when the base signal transmission/reception is set.

In addition, DCI format 1_0 is used to schedule TB-based (or TB-level) PDSCH, DCI format 1_1 is TB-based (or TB-level) PDSCH or (when CBG-based signal transmission and reception is set) CBG-based (or CBG- level) can be used to schedule the PDSCH.

In addition, DCI format 2_0 is used for notifying the slot format (used for notifying the slot format), DCI format 2_1 is used for notifying PRB and OFDM symbols that assume that a specific UE has no intended signal transmission ( used for notifying the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE), DCI format 2_2 is used for transmission of Transmission Power Control (TPC) commands of PUCCH and PUSCH , DCI format 2_3 may be used for transmission of a group of TPC commands for SRS transmission by one or more UEs (used for the transmission of a group of TPC commands for SRS transmissions by one or more UEs).

More specifically, DCI format 1_1 includes an MCS/NDI (New Data Indicator)/RV (Redundancy Version) field for transport block (TB) 1, and the upper layer parameter maxNrofCodeWordsScheduledByDCI in the upper layer parameter PDSCH-Config has n2 (ie , 2), the MCS/NDI/RV field for transport block 2 may be further included.

In particular, when the upper layer parameter maxNrofCodeWordsScheduledByDCI is set to n2 (that is, 2), whether to enable or disable the transport block (enable/disable) may be determined by a combination of MCS field and RV field. More specifically, when the MCS field for a specific transport block has a value of 26 and the RV field has a value of 1, the specific transport block may be disabled.

The specific features of the DCI format can be supported by 3GPP TS 38.212 document. That is, obvious steps or parts that are not described among DCI format-related features may be described with reference to the document. Also, all terms disclosed in this document may be described by the standard document.

1.4. CORESET (Control resource set)1.4. CORESET (Control resource set)

One CORESET include N _symb ^CORESET symbols (corresponding value having a value of 1, 2, 3) in the time domain and includes a ^CORESET N _RB of RB in the frequency domain.

One control channel element (CCE) includes 6 resource element groups (REGs), and one REG is the same as one RB on one OFDM symbol. REGs in the CORESET are numbered in the order according to the time-first manner. Specifically, the numbering starts from '0' for the first OFDM symbol in CORESET and the lowest-numbered RB.

A plurality of CORESETs may be set for one terminal. Each CORESET is related only to one CCE-to-REG mapping.

CCE-to-REG mapping for one CORESET may be interleaved or non-interleaved.

The setting information for CORESET can be set by the upper layer parameter ControlResourceSet IE.

In addition, setting information for CORESET 0 (eg, common CORESET) can be set by the upper layer parameter ControlResourceSetZero IE.

1.5. 안테나 포트 의사 코-로케이션 (antenna ports quasi co-location)1.5. Antenna ports quasi co-location

A list of maximum M TCI (Transmission Configuration Indicator) state settings for one terminal may be set. The maximum M TCI state setting may be set by the upper layer parameter PDSCH-Config so that the (the UE) can decode the PDSCH upon detection of the PDCCH including the DCI intended for the UE and a given serving cell. have. Here, the M value may be determined depending on the capability of the terminal.

Each TCI-state includes a parameter for setting a QCL (quasi co-location) relationship between one or two downlink reference signals and DMRS ports of the PDSCH. The QCL relationship is established based on the upper layer parameter qcl-Type1 for the first DL RS (downlink reference signal) and the upper layer parameter qcl-Type2 for the second DL RS (if set). For the case of two DL RSs, regardless of whether the reference signals are the same DL RS or a different DL RS, the QCL types should not be the same (shall not be the same). The QCL types correspond to each DL RS given by the upper layer parameter qcl-Type in the upper layer parameter QCL-Info , and the QCL types can have one of the following values.

-'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

-'QCL-TypeB': {Doppler shift, Doppler spread}

-'QCL-TypeC': {Doppler shift, average delay}

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

The terminal receives an activation command (activation command) used to map the maximum 8 TCI states with a codepoint of a Transmission Configuration Indication (TCI) field in DCI. When the HARQ-ACK signal corresponding to the PDSCH including the activation command is transmitted in slot #n, the mapping between code points of the TCI fields in the TCIs states and the DCI is slot #(n+3*N ^{subframe, μ} _slot + It can be applied from 1). Here, N ^{subframe, μ} _slot is determined based on Table 1 or Table 2 described above. After the terminal has received the initial higher layer configuration of the TCI states (initial higher layer configuration) and before the terminal has received the activation command, the terminal has the DMRS port(s) of the PDSCH of the serving cell as'QCL-TypeA From the viewpoint, it is assumed that it is QCL with the SS/PBCH (Synchronization Signal / Physical Broadcast Channel) block determined in the initial access procedure. Additionally, at the time, the UE may assume that the DMRS port(s) of the PDSCH of the serving cell is QCL with the SS/PBCH block determined in the initial access procedure from the perspective of'QCL-TypeD'.

When the upper layer parameter tci-PresentInDCI is set to'enabled ' for CORESET scheduling PDSCH, the UE assumes that the TCI field is present in the PDCCH of DCI format 1_1 transmitted on the CORESET. The upper layer parameter tci-PresentInDCI is not set for the CORESET for scheduling the PDSCH, or the PDSCH is scheduled by DCI format 1_0, and the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH is a threshold Threshold-Sched -Offset (the threshold is determined based on the reported UE capability ) or greater than or equal to, in order to determine the PDSCH antenna port QCL, the terminal is a TCI state for the PDSCH or QCL assumption CORESET used for PDCCH transmission It is assumed that it is the same as the TCI state or QCL assumption applied to.

When the upper layer parameter tci-PresentInDCI is set to'enabled ' and the TCI field in DCI scheduling CC (component carrier) indicates the activated TCI states in the scheduled CC or DL BW (point to), the PDSCH When is scheduled by DCI format 1_1, the UE uses the TCI-State based on the TCI field included in the DCI in the detected PDCCH to determine the PDSCH antenna port QCL. When the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH is greater than or equal to a threshold Threshold-Sched-Offset (the threshold is determined based on the reported UE capability), the UE determines the PDSCH of the serving cell. It is assumed that the DMRS port(s) are QCL with RS(s) in the TCI state for the QCL type parameter(s) given by the indicated TCI stated. When a single slot PDSCH is configured for the UE, the indicated TCI state should be based on the activated TCI states in the slot of the scheduled PDSCH. When CORESET associated with a search space set for cross-carrier scheduling is set to the terminal, the terminal assumes that the upper layer parameter tci-PresentInDCI is set to'enabled ' for the CORESET. When one or more TCI states set for the serving cell scheduled by the region set include'QCL-TypeD', the terminal is a time offset between the reception time of the detected PDCCH in the discovery region set and the reception time of the corresponding PDSCH. Is expected to be greater than or equal to Threshold-Sched-Offset .

Higher layer parameters tci-PresentInDCI is set to 'enabled', or in RRC connected mode, the offset between the reception point of the PDSCH, which for both is not set is the upper layer parameter tci-PresentInDCI, if the response to the reception of DL DCI time threshold If less than Threshold-Sched-Offset , the terminal assumes the following. (i) The DMRS port(s) of the PDSCH of the serving cell has a QCL relationship to the RS(s) and QCL parameter(s) of the TCI state. (ii) At this time, the QCL parameter(s) is for PDCCH QCL indication of CORESET associated with the search area monitored with the lowest CORESET-ID in the last slot in one or more CORESETs in the activation BWP of the serving cell monitored by the terminal. For both the cases when higher layer parameter tci-PresentInDCI is set to'enabled ' and the higher layer parameter tci-PresentInDCI is not configured in RRC connected mode, if the offset between the reception of the DL DCI and the corresponding PDSCH is less than the threshold Threshold-Sched-Offset, the UE may assume that the DM-RS ports of PDSCH of a serving cell are quasi co-located with the RS(s) in the TCI state with respect to the QCL parameter(s) used for PDCCH quasi co-location indication of the CORESET associated with a monitored search space with the lowest CORESET-ID in the latest slot in which one or more CORESETs within the active BWP of the serving cell are monitored by the UE.)

In this case, when the'QCL-TypeD' of the PDSCH DMRS is different from the'QCL-TypeD' of the PDCCH DMRS overlapping on at least one symbol, the UE expects to prioritize the reception of the PDCCH associated with the corresponding CORESET. This operation can also be applied in the case of intra-band (intra band) CA (if PDSCH and CORESET are in different CCs). If there is no TCI state including'QCL-TypeD' among the set TCI states, the UE, regardless of the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH, indicates the TCI indicated for the scheduled PDSCH. Obtain different QCL assumptions from state.

For periodic CSI-RS resources in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter trs-Info is set, the UE should assume that the TCI state indicates one of the following QCL type(s):

-'QCL-TypeC' for SS/PBCH block, (when applicable) when (QCL-TypeD) is applicable,'QCL-TypeD' for the same SS/PBCH block, or

-'QCL-TypeC' for SS/PBCH block and'QCL for periodic CSI-RS resource in upper layer parameter NZP-CSI-RS-ResourceSet in which upper layer parameter repetition is set when (QCL-TypeD) is applicable -TypeD'

For the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet set without upper layer parameter trs-Info and upper layer parameter repetition , the terminal should assume that the TCI state indicates one of the following QCL type(s). :

-'QCL-TypeA' for CSI-RS resources in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter trs-Info is set, and when (QCL-TypeD) is applicable, for the same CSI-RS resource 'QCL-TypeD', or

-'QCL-TypeA' for the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter trs-Info is set, and, for the SS/PBCH block if (QCL-TypeD) is applicable. QCL-TypeD', or

-When'QCL-TypeA' and (QCL-TypeD are applicable) for CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet with upper layer parameter trs-Info set, upper layer parameter repetition is set 'QCL-TypeD' for the periodic CSI-RS resource in the layer parameter NZP-CSI-RS-ResourceSet , or

-When'QCL-TypeB'and'QCL-TypeD' for CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter trs-Info is set is not applicable

For the CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet where the upper layer parameter repetition is set, the UE should assume that the TCI state indicates one of the following QCL type(s):

-When'QCL-TypeA' and (QCL-TypeD are applicable) for CSI-RS resource in the upper layer parameter NZP-CSI-RS-ResourceSet with upper layer parameter trs-Info set, upper layer parameter repetition is set 'QCL-TypeD' for the CSI-RS resource in the layer parameter NZP-CSI-RS-ResourceSet , or

-'QCL-TypeC' for the SS/PBCH block and'QCL-TypeD' for the same SS/PBCH block if (QCL-TypeD) is applicable

For DMRS of PDCCH, the terminal should assume that the TCI state indicates one of the following QCL type(s):

-'QCL-TypeA' for CSI-RS resource in upper layer parameter NZP-CSI-RS-ResourceSet set without upper layer parameter trs-Info and upper layer parameter repetition , and, if (QCL-TypeD) is applicable, the same CSI -'QCL-TypeD' for RS resource

For DMRS of the PDSCH, the UE should assume that the TCI state indicates one of the following QCL type(s):

In this document, QCL signaling may include all signaling configurations listed in the table below.

In the following tables, when a row including the same RS type exists, it may be assumed that the same RS ID is applied.

For example, when the CSI-RS resource set by the upper layer parameter NZP-CSI-RS-ResourceSet together with the upper layer parameter trs-Info exists, the UE can perform the following two possible settings of the upper layer parameter TCI-State . You can only expect settings.

In the above table, * may mean that, when QCL type-D is applicable, DL RS 2 and QCL type-2 may be set for the terminal.

As another example, if there is a CSI-RS resource set by the upper layer parameter NZP-CSI-RS-ResourceSet , without upper layer parameter trs-Info and upper layer parameter repetition , the UE performs upper layer parameter TCI-State. Only the three possible settings below can be expected.

In the above table, * may mean that QCL type-D is not applicable.

In the above table, ** may mean that, when QCL type-D is applicable, DL RS 2 and QCL type-2 may be set for the terminal.

As another example, if there is a CSI-RS resource set by the upper layer parameter NZP-CSI-RS-ResourceSet together with the upper layer parameter repetition , the UE can set the following three possible settings of the upper layer parameter TCI-State . You can only expect.

In the following two tables, when QCL type-D is applicable, DL RS 2 and QCL type-2 are set for the terminal, except for the default case (the fourth row of the following two tables). You can. If TRS for downlink is used for QCL type-D, TRS may have a reference signal for beam management (BM) as a source RS for QCL type-D (eg, SSB or CSI-RS). .

For DMRS of the PDCCH, the UE only has the following three possible settings of the upper layer parameter TCI-State while the fourth setting (the fourth row of the two tables below) is valid as the default setting before TRS is set. I can expect.

In the above table, * may mean a setting that can be applied before TRS is set. Accordingly, the setting is not a TCI state, but rather can be interpreted as a valid QCL assumption.

In the above table, ** may mean that QCL parameters are not directly derived from CSI-RS (or CSI).

For DMRS of the PDCCH, the UE only has the following three possible settings of the upper layer parameter TCI-State while the fourth setting (the fourth row of the two tables below) is valid by default before TRS is set. I can expect.

In the above table, * may mean a setting that can be applied before TRS is set. Accordingly, the setting may be interpreted as a valid QCL assumption rather than a TCI state.

1.6. CSI-RS (channel state information reference signal)1.6. CSI-RS (channel state information reference signal)

In the mobile communication system according to the present disclosure, a method capable of improving transmission/reception data efficiency by employing multiple transmission antennas and multiple reception antennas for packet transmission is used. When transmitting/receiving data using multiple input/output antennas, a channel condition between a transmitting antenna and a receiving antenna must be detected to accurately receive a signal. Therefore, each transmit antenna may have a separate reference signal. In this case, a reference signal for feedback of channel state information (CSI) may be defined as CSI-RS.

CSI-RS includes ZP (Zero Power) CSI-RS and NZP (Non-Zero-Power) CSI-RS. At this time, ZP CSI-RS and NZP CSI-RS may be defined as follows.

-NZP CSI-RS may be set by the CSI-RS-Resource-Mobility field in the NZP-CSI-RS-Resource IE (Information Element) or CSI-RS-ResourceConfigMobility IE. The NZP CSI-RS may be defined based on a sequence generation and resource mapping method defined in the 3GPP TS 38.211 standard spec.

-ZP CSI-RS can be set by ZP-CSI-RS-Resource IE. The UE may assume that the resource set for ZP CSI-RS is not used for PDSCH transmission. The UE can perform the same measurement/reception on the channel/signal regardless of whether the channel/signal except the PDSCH collides with the ZP CSI-RS (The UE performs the same measurement/reception on channels/signals except PDSCH regardless of whether they collide with ZP CSI-RS or not).

Dynamically by: (firstOFDMSymbolInTimeDomain, firstOFDMSymbolInTimeDomain2, and so on) within a slot where the CSI-RS is mapped to the CSI-RS port number, CSI-RS density (density), CDM (Code Division Multiplexing) -Type and upper layer parameters (dynamic) can be determined,

1.7. DMRS (Demodulation Reference Signal)1.7. DMRS (Demodulation Reference Signal)

In the NR system according to the present disclosure, DMRS may be transmitted and received in a first loaded structure (frond load structure). Alternatively, an additional DMRS (DMRS) other than the first DMRS may be additionally transmitted and received.

Front loaded DMRS can support fast decoding. The first OFDM symbol carried by the front loaded DMRS may be determined as the third (eg, l=2) or the fourth OFDM symbol (eg, l=3). The first FODM symbol position may be indicated by a PBCH (Physical Broadcast Channel).

The number of OFDM symbols occupied by the front loaded DMRS may be indicated by a combination of Downlink Control Information (DCI) and Radio Resource Control (RRC) signaling.

Additional DMRS can be set for a high-speed terminal. Additional DMRS may be located in the middle / last symbol (s) in the slot. When one Front loaded DMRS symbol is set, Additional DMRS may be allocated to 0 to 3 OFDM symbols. When two Front loaded DMRS symbols are set, Additional DMRS may be assigned to 0 to 2 OFDM symbols.

Front loaded DMRS is composed of two types, and one of the two types may be indicated through higher layer signaling (eg, RRC signaling).

In the present disclosure, two DMRS configuration types may be applied. Among the two types of DMRS configuration, the DMRS configuration type that is substantially set for the terminal may be indicated by higher layer signaling (eg, RRC).

In the case of the first DMRS configuration type (DMRS configuration type 1), the front loaded DMRS may be classified as follows according to the number of OFDM symbols allocated.

The number of OFDM symbols to which the first DMRS configuration type (DMRS configuration type 1) and Front loaded DMRS are allocated = 1

Up to four ports (eg, P0 to P3) may be multiplexed based on a length-2 F-CDM (Frequency-Code Division Multiplexing) and FDM (Frequency Division Multiplexing) method. RS density can be set to 6 RE per port in the RB (Resource Block).

First DMRS configuration type (DMRS configuration type 1) and the number of OFDM symbols allocated to the front loaded DMRS = 2

Up to 8 ports (for example, P0 to P7) may be multiplexed based on a length-2 F-CDM, a length-2 time-code division multiplexing (T-CDM), and an FDM method. Here, when the existence of PT-RS is set by higher layer signaling, T-CDM may be fixed to [1 1]. RS density can be set to 12 RE per port in the RB.

In the case of the second DMRS configuration type (DMRS configuration type 2), the front loaded DMRS may be classified as follows according to the number of OFDM symbols allocated.

2nd DMRS configuration type (DMRS configuration type 2) and Front loaded DMRS number of OFDM symbols allocated = 1

Up to six ports (eg, P0 to P5) can be multiplexed based on the length-2 F-CDM and FDM methods. RS density can be set to 4 RE per port in the RB (Resource Block).

2nd DMRS configuration type (DMRS configuration type 2) and the number of OFDM symbols allocated to the front loaded DMRS = 2

Up to 12 ports (eg, P0 to P11) can be multiplexed based on the length-2 F-CDM, length-2 T-CDM and FDM methods. Here, when the existence of PT-RS is set by higher layer signaling, T-CDM may be fixed to [1 1]. RS density can be set to 8 RE per port in the RB.

More specifically, FIG. 6(a) shows a structure in which DMRS is first loaded on one symbol (front loaded DMRS with one symbol), and FIG. 6(b) is a structure in which DMRS is first loaded on two symbols (front loaded) DMRS with two symbols).

In FIG. 6, Δ denotes the DMRS offset value in the frequency axis. At this time, DMRS ports having the same △△ can be code division multiplexing in frequency domain (CDM-F) or frequency division multiplexing in time domain (CDM-T) in the frequency domain. have. In addition, DMRS ports having different △ may be CDM-F to each other.

According to the present disclosure, CDM-F is

It can be applied based on, CDM-T is in the table below

It can be applied on the basis of. In this case, k'and l'are parameter values for determining the subcarrier index to which the corresponding DMRS is mapped, and may have a value of 0 or 1. And, DMRS corresponding to each DMRS port according to the DMRS configuration type may be divided into CDM groups as shown in the following table.

Table 12 below shows parameters for a first DMRS configuration type for PDSCH, and Table 13 shows parameters for a second DMRS configuration type for PDSCH.

The terminal may obtain DMRS port setting information set by the base station through DCI. For example, the DMRS configuration type set in the terminal (eg, the first DMRS configuration type (dmrs-Type=1), the second DMRS configuration type (dmrs-Type=2)), the maximum number of OFDM symbols for DL front loaded DMRSfmf (eg Based on maxLength=1 or maxLength=2), the UE may obtain DMRS port configuration information through an antenna ports field of DCI format 1_1. More specifically, Table 14 shows DMRS port setting information according to the value of the antenna port field when (dmrs-Type=1 and maxLength=1) is set for the terminal, and Table 15 shows (dmrs-Type=1 and maxLength) to the terminal. =2) indicates DMRS port setting information according to the value of the antenna port field. Table 16 shows the DMRS port setting information according to the value of the antenna port field when (dmrs-Type=2 and maxLength=1) is set for the terminal, and Table 17 shows (dmrs-Type=2 and maxLength=2) to the terminal. If set, indicates DMRS port setting information according to the value of the antenna port field.

At this time, the terminal may perform DMRS reception according to conditions as follows.

In DMRS configuration type 1,

-One codeword is scheduled for the terminal, and indicates one of {2, 9, 10, 11, 30} as an index value related to antenna port mapping (eg, an index value of Table 14 or Table 15) to the terminal DCI is assigned,

-When two codewords are scheduled for the terminal,

The UE may receive DMRS under the assumption that all the remaining orthogonal antenna ports are not associated with PDSCH transmission to another UE.

In DMRS configuration type 2,

-One codeword is scheduled for the terminal, and a DCI indicating one of {2, 10, 23} is assigned to the terminal as an index value related to antenna port mapping (eg, an index value of Table 15 or Table 16) Or

-When two codewords are scheduled for the terminal,

1.8. 코드워드 (codeword)1.8. Codeword

In the present disclosure, the base station may set the maximum number of codewords scheduled through one DCI to the UE through higher layer signaling. As an example, the base station may set the maximum number of codewords scheduled through one DCI to the UE to 1 or 2 based on the upper layer parameter maxNrofCodeWordsScheduledByDCI (having an n1 or n2 value). At this time, the upper layer parameter maxNrofCodeWordsScheduledByDCI may be included in the upper layer parameter PDSCH-Config .

Referring to the Rel-15 TS 38.212 standard document, DCI format 1_1 may be configured as shown in the following table according to the upper layer parameter maxNrofCodeWordsScheduledByDCI .

Therefore, NDI, MCS, and RV of CW#0 can be set/indicated based on NDI, MCS, and RV corresponding to Transport block 1 in DCI. Likewise, NDI, MCS, and RV of CW#1 may be set/instructed based on NDI, MCS, and RV corresponding to Transport block 2 in the DCI.

Additionally, (i) the bandwidth part indicator field indicates a bandwidth part that is not an active bandwidth part, and (ii) the value of the upper layer parameter maxNrofCodeWordsScheduledByDCI for the indicated bandwidth part is 2 and , (iii) When the value of the upper layer parameter maxNrofCodeWordsScheduledByDCI for the active bandwidth part is 1, when the UE analyzes the MCS, NDI, and RV fields of transport block 2, it can be assumed that the corresponding fields are padded with zero. have. Subsequently, in this case, the UE may ignore the MCS, NDI, and RV fields of transport block 2 for the indicated bandwidth part.

In addition, when the upper layer parameter maxNrofCodeWordsScheduledByDCI indicates that two codeword transmissions are enabled, one transport block (or codeword) of the two transport blocks (or codewords) is activated based on the following method Or it can be deactivated.

More specifically, when the upper layer parameter maxNrofCodeWordsScheduledByDCI indicates that two codeword transmissions are enabled, one of the two transport blocks is (i) MCS value for the corresponding transport block in DCI format 1_1 If it is 26 (i.e., I _MCS = 26), and (ii) RV value is 1 (i.e., rv _id = 1), it can be deactivated. If both transport blocks are activated, transport block 1 and transport block 2 may be mapped to codeword 0 and codeword 1, respectively. If only one transport block is activated, the activated transport block can always be mapped to the first codeword (ie, codeword 0).

1.9. 본 개시에 적용 가능한 시간/주파수 자원 할당 케이스1.9. Time/frequency resource allocation case applicable to the present disclosure

In the present disclosure, T/F resources of each PDSCH (eg, PDSCH #0 and PDSCH #1) transmitted from different transmission and reception points (TRPs) (or beams or panels) may be variously overlapped. In this case, the case where the T/F resources overlap may include all five cases shown in FIG. 7.

As illustrated in FIG. 7, two PDSCHs may be partially overlapped (eg, case#1 to #3) or overlapped on one of the time domains or frequency domains of the two PDSCHs (eg, case#4). , #5). In Case#1/#2/#3 of FIG. 7, two PDSCHs are overlapped (partially) in both time and frequency. Case #4 of FIG. 7 shows that the two PDSCHs do not overlap only on the time axis. In Case #5 of FIG. 7, two PDSCHs overlap on the time axis, but do not overlap on the frequency axis.

1.10. 단일 PDCCH (Single PDCCH) 시스템1.10. Single PDCCH (Single PDCCH) system

In FIG. 8, it is assumed that two TRP#1/#2 transmit PDSCH#1/#2 to one UE, respectively. In the following description, as shown in FIG. 8, an operation in which a plurality of PDSCHs are scheduled by one PDCCH is referred to as a single PDCCH system or a single PDCCH operation. In other words, a single PDCCH may mean a PDCCH that schedules a plurality of PDSCHs (for different TRPs).

For convenience of description, the following description exemplifies two TRPs as an example of a plurality of TRPs, but according to an embodiment, the corresponding operation may be equally applied to three or more TRPs. In other words, in the present disclosure, a single PDCCH may include a PDCCH that schedules a PDSCH for three or more TRPs.

According to a single PDCCH system, even if the UE receives PDSCHs from different TRPs, the UE can acquire scheduling information of the plurality of PDSCHs by receiving one PDCCH. Accordingly, the PDCCH reception complexity of the terminal may be lowered.

On the other hand, according to a multiple PDCCH (Multi PDCCH) system or multiple PDCCH operation in which two TRPs transmit PDCCHs respectively, and each of the PDCCHs schedules PDSCH #1/#2, the UE successfully receives two PDCCHs. Only the two PDSCHs can be received. On the other hand, in the case of a single PDCCH system or a single PDCCH operation, since the UE can receive two PDSCHs by successfully receiving only one PDCCH, performance degradation due to PDCCH miss detection can be minimized.

In FIG. 8, the PDCCH scheduling PDSCH #1/#2 may be transmitted from TRP #1 and/or TRP #2 to the UE.

1.11. Non-Coherent Joint Transmission (NC-JT)1.11. Non-Coherent Joint Transmission (NC-JT)

In this document, time resources of PDSCHs transmitted by different TRPs (or beams) are overlapped (partially) or (partially CASE#5 in FIG. 7) or time and frequency resources (partially) are overlapped (eg: In the case of CASE#1, #2, #3) of FIG. 7, the signal transmission method based on this is called NC-JT.

In this document, single DCI based NC-JT (Single DCI based NC-JT) means NC-JT operation when PDSCHs transmitted from the different TRPs (or beams) are scheduled by one DCI. Can. For example, a single DCI-based NC-JT may include NC-JT operation when PDSCH#1/#2 are simultaneously scheduled by DCI#1.

In this document, multiple DCI based NC-JT (Multi DCI based NC-JT) means NC-JT operation when PDSCHs transmitted from the different TRPs (or beams) are scheduled by each DCI. Can. For example, the multi-DCI-based NC-JT may include NC-JT operation when PDSCH#1/#2 are simultaneously scheduled by DCI#1/#2, respectively.

In this document, NC-JT can be divided into two types depending on whether a layer transmitted by different TRPs is independent or common.

In this document, the term'layers are independent' means that when TRP#A transmits a signal through 3 layers and TRP#B transmits a signal through 4 layers, the UE can transmit a total of 7 layers. It may mean expecting to receive a signal through.

On the other hand, in this document,'layers are common' means that when TRP#A transmits a signal through three layers and TRP#B transmits a signal through three layers, a total of three terminals are used. It may mean expecting signal reception through the layer.

In this document, in order to distinguish the above two operations, the NC-JT based on the former operation is referred to as'NC-JT with IL (Independent Layer)', and the NC-JT based on the latter operation is referred to as'NC-JT. with CL (Common Layer).

In this document, various operation examples are described based on the'NC-JT with IL' operation (or mode), but the operation examples can be extended to operation examples based on the'NC-JT with CL' operation (or mode). have.

1.12. HARQ 프로세스1.12. HARQ process

The DCI transmitted by the base station to the terminal may include a'HARQ process number' field composed of 4 bits. Based on the HARQ process number indicated by the'HARQ process number' field in the DCI, the UE may discriminate/recognize which of the previously transmitted PDSCHs is retransmitted for the PDSCH.

1.13. 변조 차수 (modulation order) 및 타겟 코드 레이트 (target code rate) 결정1.13. Determination of modulation order and target code rate

In this document, PDSCH is a C-RNTI (cell radio network temporary identifier (RNTI), MCS-C-RNTI (modulation coding scheme cell RNTI), TC-RNTI (temporary cell RNTI), CS-RNTI (configured scheduling RNTI) ), cyclic redundancy check (CRC) scrambled PDCCH (e.g. DCI format 1_0 or DCI format 1_1) by SI-RNTI (system information RNTI), RA-RNTI (random access RNTI) or P-RNTI (paging RNTI) Can be scheduled by Alternatively, the PDSCH may be scheduled based on the PDSCH configuration ( SPS-config ) provided from a higher layer without corresponding PDCCH transmission. The modulation order and target code rate for such PDSCHs may be determined/set as follows.

(1) (i) the upper layer parameter mcs-Table provided by PDSCH-Config is set to'qam256', (ii) PDSCH is CRC scrambled by C-RNTI DCI format 1_1 (or the DCI format 1_1) Including PDCCH),

-The UE may determine the modulation order (Q _m ) and the target code rate (R) for the PDSCH based on the MCS value (eg, I _MCS ) and Table 20.

(2) Or, (i) MCS-C-RNTI is not set to the UE , (ii) the upper layer parameter mcs-Table provided by PDSCH-Config is set to'qam64LowSE', and (iii) PDSCH is C When scheduled by the PDCCH in the UE-specific search space (CRC scrambled by RNTI),

-The UE may determine the modulation order (Q _m ) and the target code rate (R) for the PDSCH based on the MCS value (eg, I _MCS ) and Table 21.

(3) Or, (i) when the MCS-C-RNTI is set to the terminal, (ii) PDSCH is scheduled by the PDCCH CRC scrambled by the MCS-C-RNTI,

(4) Or, (i) the upper layer parameter mcs-Table provided by SPS-Config is not set to the terminal, and (ii) the upper layer parameter mcs-Table provided by PDSCH-Config is set to'qam256' If it becomes,

-When the PDSCH is scheduled by DCI format 1_1 (or PDCCH including the DCI format 1_1) CRC scrambled by CS-RNTI, or

-When the PDSCH is scheduled using SPS-config without corresponding PDCCH transmission,

--The UE may determine the modulation order (Q _m ) and the target code rate (R) for the PDSCH based on the MCS value (eg, I _MCS ) and Table 20.

(5) Or, (i) When the upper layer parameter mcs-Table provided by SPS-Config is set to'qam64LowSE',

-When the PDSCH is scheduled by the CRC scrambled PDCCH by CS-RNTI, or

--The UE may determine the modulation order (Q _m ) and the target code rate (R) for the PDSCH based on the MCS value (eg, I _MCS ) and Table 21.

(6) Or, the UE may determine the modulation order (Q _m ) and the target code rate (R) for the PDSCH based on the MCS value (eg, I _MCS ) and Table 19.

1.14. 전송 블록 크기 결정 방법 (Transport block size determination)1.14. Transport block size determination

5.1.3.2 in 3GPP TS 38.214 standard spec. Based on the clause, a transmission block size between a terminal and a base station according to the present disclosure may be determined. More specifically, the transport block size can be determined as follows.

If the upper layer parameter maxNrofCodeWordsScheduledByDCI indicates that two codeword transmissions are activated, if the (i) I _MCS value for the corresponding transport block is 26 and (ii) the value of rv _id is 1, the corresponding transport block is DCI format It can be deactivated by 1_1. If both transport blocks are activated, transport block 1 and transport block 2 may be mapped to codeword 0 and codeword 1, respectively. If only one transport block is activated, the activated transport block can always be mapped to the first codeword (eg, codeword 0).

For FDSCH allocated by DCI format 1_0 or DCI format 1_1 (or PDCCH including it) CRC scrambled by C-RNTI, MCS-C-RNTI, TC-RNTI, CS-RNTI or SI-RNTI, (i) If Table 19 is used and the I _MCS value is greater than or equal to 0 and less than or equal to 27, or (ii) Table 18 or Table 20 is used and the I _MCS value is greater than or equal to 0 and less than or equal to 27, the UE , Except for the case where the transport block on DCI format 1_1 is deactivated, TBS (Transport Block Size) may be determined as follows.

(1) The UE first determines the number of REs in the slot (eg, N _RE ).

-The UE first determines the number of REs allocated for the PDSCH in the PRB (eg, _N'RE ) based on the following equation.

In the above equation,

Denotes the number of subcarriers in the physical resource block,

Denotes the number of symbols included in the PDSCH allocation in the slot,

Denotes the number of REs for DMRS for each PRB in a scheduled section including the overhead of a dataless DMRS CDM group, indicated by DCI format 1_1 or determined according to DCI format 1_0 characteristics,

Indicates the overhead set by the upper layer parameter xOverhead in the upper layer parameter PDSCH-ServingCellConfig . If the upper layer parameter ServingCellConfig-PDSCH in the upper layer xOverhead parameter is not set (indicating that the value may be set to 0, 6, 12 or 18 values),

Is set to 0. When the PDSCH is scheduled by the PDCCH CRC scrambled by SI-RNTI, RA-RNTI or P-RNTI,

Can be assumed to be 0.

-The UE may determine the total number of REs allocated for the PDSCH (N _RE ) based on the following equation.

In the above equation, n _PRB represents the total number of PRBs allocated for the terminal.

(2) Intermediate number (N _info ) of information bits can be obtained based on the following equation.

In the above equation, R denotes a target code rate determined by the MCS field, Qm denotes a modulation order determined by the MCS field, and υ denotes the number of layers. .

If the size of N _info is 3824 or less, step 3 may be used as the next step of TBS determination. Conversely, if the size of N _info exceeds 3824, step 4 may be used as the next step of TBS determination.

(3) When the size of N _info is 3824 or less, TBS may be determined as follows:

- the N _'info is to the intermediate number of information bits quantized values (quantized intermediate number of information bits) may be set to satisfy the following formula.

In the above equation, n value is

Can be satisfied.

- based on the following table, N 'Find Nearest TBS that is not less than _info.

(4) If the size of N _info is greater than 3824, TBS can be determined as follows:

In the above equation, n value is

Can be satisfied.

--When the R value is 1/4 or less, TBS may be determined to satisfy the following equation.

In the above equation, C value is

It can be set to satisfy.

- or, if the R value is greater than 1/4 and N _'info value is greater than 8424, TBS may be determined so as to satisfy the following equation.

In the above equation, C value is

It can be set to satisfy.

-Alternatively, TBS may be determined to satisfy the following equation.

Unlike previously described above, when Table 19 is used and the I _MCS value is greater than or equal to 28 and less than or equal to 31, TBS may be determined as follows.

-More specifically, in the above case, it can be assumed that the TBS is determined from the transmitted DCI in the latest PDCCH for the same transport block using I _MCS having a value of 0 to 27. If (i) there is no identical transport block using I _MCS having a value from 0 to 27, and (ii) the initial PDSCH for the same transport block is semi-persistently scheduled, TBS is the most recent. SPS (semi-persistent scheduling) allocation can be determined from the PDCCH.

Or, it can be assumed that the TBS is determined from the transmitted DCI in the latest PDCCH for the same transport block using I _MCS having a value of 0 to 28. If (i) there is no identical transport block using I _MCS having a value of 0 to 28, and (ii) the initial PDSCH for the same transport block is semi-persistently scheduled, TBS is the most recent. SPS (semi-persistent scheduling) allocation can be determined from the PDCCH.

The UE may not expect that the PDSCH allocated by the PDCCH CRC scrambled by SI-RNTI has a TBS exceeding 2976 bit size.

For PDSCH allocated by DCI format 1_0 (or PDCCH including it) CRC scrambled by P-RNTI or RA-RNTI, the TBS decision follows steps 1-4 above, but the following points are corrected in step 2 the first step in the state-can follow the 4: for when calculating N _info, N _info must be scaled to satisfy the following formula. Here, the scaling factor is determined based on the TB scaling field in DCI disclosed in the following table.

In addition to the NDI and HARQ process ID signaled on the PDCCH, the TBS determined as described above may be reported to the upper layer (in the terminal).

2. 본 문서에서 개시하는 단말 및 기지국의 동작 예2. Examples of operation of terminals and base stations disclosed in this document

2.0. 정의2.0. Justice

In the present disclosure, terms used to describe the present disclosure may be defined as follows.

In the present disclosure, the higher layer signaling may include radio resource control (RRC) signaling and/or medium access control (MAC-CE) elements.

In the present disclosure, a Transmission Reception Point (TRP) may be alternatively applied with a beam.

In the present disclosure,'PDSCH repetition' means (i) a plurality of TRP/beam(s) simultaneously transmits PDSCHs on the same OFDM symbol(s) on the same frequency resource, or (ii) a plurality of TRP/beam(s) transmits PDSCHs simultaneously on some overlapping frequency resources on the same OFDM symbol(s), or (iii) multiple TRP/beam(s) on different frequency resources on the same OFDM symbol(s). It may include transmitting PDSCH at the same time (for example, see Case #2 and #5 of FIG. 7). Additionally,'PDSCH repetition' refers to (iv) PDSCH transmission on OFDM symbols in which a plurality of TRP/beam(s) are partially overlapped, or (v) a plurality of TRP/beam(s) are different. It may further include transmitting the PDSCH alternately on the OFDM symbol (for example, see Case #1, #3, #4 of FIG. 7).

In the present disclosure, a precoding resource block group (PRG) may correspond to a resource block group (RBG) or RB.

In the present disclosure, a plurality of codewords (CW) generated from the same information sequence (information sequence) may be replaced with'a plurality of codewords generated from the same TB'. In this case, CW#0 and CW#1 can correspond to the same TB. However, the DCI for this may include NDI, MCS, and RV divided by TB (eg, TB#1, TB#2). In consideration of this, based on the indexes CW#0, #1, (i) NDI, MCS, and RV of CW#0 in DCI indicate NDI, MCS, and RV corresponding to Transport block 1, and (ii) In DCI NDI, MCS, and RV of CW#1 may indicate NDI, MCS, and RV corresponding to Transport block 2.

In the present disclosure, as a method for a base station to indicate a plurality of TRPs/Beams to a user equipment through DCI, the base station may use a TCI state including a plurality of RS sets (eg, indicate two TRPs/Beams). To do this, it uses a TCI state that includes two RS sets). In this case, each RS set can correspond to TRPs/beams 1:1.

Or, in the present disclosure, as a method for a base station to instruct a plurality of TRPs/Beams to a terminal through DCI, the base station may allocate/set a plurality of TCI states to the terminal. At this time, each TCI state may include one RS set. In this case, each TCI state can correspond to TRPs/beams 1:1.

Therefore, in the following description, as a method for the base station to indicate a plurality of TRPs/Beams to the terminal, (i) not only the method for the base station to indicate the TCI state having two RS sets to the terminal, (even if there is no specific mention). , (ii) may indicate a method in which the base station indicates two different TCI states each having one RS set to the terminal.

In the present disclosure, the term beam may be replaced with a resource.

In the present disclosure, NDI and/or RV and/or MCS of CW#1 (or TB#2) means NDI and/or CW#1 (or TB#2) of CW#1 (or TB#2) ) Of RV and/or MCS of CW#1 (or TB#2).

In the present disclosure, the New Data Indicator (NDI) of the second TB and/or the Redundancy Version (RV) and/or the MCS means the New Data Indicator (NDI) of the second TB and/or the RV of the second TB ( Redundancy Version) and/or MCS of the second TB.

In the present disclosure, based on at least one of the New Data Indicator (NDI) of the second TB and/or Redundancy Version (RV) and/or MCS fields, the base station provides the UE with a mapping relationship between RS sets and CWs, CW DMRS ports of #1 and/or modulation order (of CW#1) can be set/instructed. Additionally, to support the operation, another existing DCI field(s) (eg, HARQ process number) or new DCI field(s) may be used instead of the DCI field(s) of the second TB.

In addition, the base station and the terminal proposed in this document may perform an operation combining a plurality of operation examples as well as each operation example described below.

In the following description, each operation example may be equally applied to downlink signal transmission as well as uplink signal transmission. In other words, in the following description, the PDSCH may be replaced by the PUSCH, the signal transmission entity may be replaced by the TRP or the base station to the terminal, and the signal reception entity may be replaced by the TRP or the base station by the terminal.

2.1. 단일 PDCCH에 기초하여 다중 TRPs로부터의 PDSCH 반복 전송을 설정하기 위한 구체적인 단말 및 기지국의 동작 예 (Method on configuration of PDSCH repetition from multiple TRPs based on single PDCCH)2.1. A specific example of an operation of a UE and a base station for configuring PDSCH repetitive transmission from multiple TRPs based on a single PDCCH (Method on configuration of PDSCH repetition from multiple TRPs based on single PDCCH)

In FIG. 9, if CWs transmitted from two TRPs are generated from the same information sequence, the UE can greatly increase the reception success rate by soft combining the two CWs.

In FIG. 9, two TRPs may transmit corresponding signals through the same T/F resource (eg, overlapped PRGs), or may transmit corresponding signals through disjoint T/F resources (eg, disjoint PRGs). .

The overlapped PRGs method may be advantageous in terms of throughput since it makes maximum use of spatial multiplexing gain. However, since the UE needs to simultaneously receive the total sum of the layers transmitted from the two TRPs, the receiver complexity of the UE can be increased. In addition, due to interference between different layers, reception performance of the terminal may be deteriorated. In addition, when performing channel state information (CSI) reporting of the terminal, the CSI report must additionally consider interference between different TRPs.

In the Disjoint PRGs method, since the PDSCHs transmitted by the two TRPs are transmitted on different resources, the spatial multiplexing gain can be reduced. However, in this case, the receiver complexity of the terminal may be reduced, and the reception performance of the terminal may also be improved.

In FIG. 9, one block may mean one PRG (Precoding Resource block Group) unit. In this case, the Disjoint PRGs method may include all three methods shown in FIG. 9.

-Localized PRGs: Each of the two TRPs can transmit the PDSCH through (approximately) half of the bandwidth indicated/allocated by the base station to the UE through DCI. According to the corresponding method, when the base station knows CSI (Channel State Information) between each TRP and the terminal, the base station can control each TRP to transmit the PDSCH to the terminal through the optimal resource by utilizing the corresponding information. .

-Interleaved PRGs: Each of the two TRPs can transmit a PDSCH by interleaving PRGs in the bandwidth indicated/allocated to the UE through DCI. According to a corresponding method, if the base station incorrectly knows or does not know the CSI (Channel State Information) between each TRP and the terminal, the base station controls each TRP to transmit PDSCH with maximum dispersion within a given bandwidth, thereby allowing frequency diversity. Can be maximized.

-TDMed PRGs: Two TRPs may transmit PDSCH through different resources that are time division multiplexing (TDM). In this case, all TRPs can transmit the PDSCH based on the same bandwidth.

Hereinafter, as described above, when transmitting CW generated from the same information sequence from a plurality of TRP/beam(s), a setting method for supporting such a transmission mode and a method of operating a terminal/base station based thereon It is explained in detail.

2.1.1. PDSCH 반복 전송 모드의 설정 방법 (Method on configuration of PDSCH repetition)2.1.1. Method for configuring PDSCH repetition transmission mode (Method on configuration of PDSCH repetition)

2.1.1.1. Method for setting the first PDSCH repeat transmission mode

The base station transmits a PDSCH repetitive transmission mode (eg, a mode in which CWs generated from the same information sequence are transmitted from a plurality of TRP/beam(s)) to the UE through upper layer signaling (eg, RRC signaling or MAC-CE). Can be set. For convenience of description, the PDSCH repeat transmission mode is referred to as'PDSCH-rep-mode'.

2.1.1.2. Method for setting the second PDSCH repeat transmission mode

The terminal may expect that the PDSCH-rep-mode is set based on the determination that at least one of the following conditions is satisfied.

-The base station transmits/instructs the DCI including the scrambled CRC based on the RNTI for PDSCH-rep-mode to the UE.

-DCI transmitted/instructed by the base station to the terminal (i) sets/instructs the TCI state including two RS sets or (ii) sets/instructs two TCI states including one RS set each

-The base station sets the PDSCH-rep-mode to the terminal through higher layer signaling

In this description, the RNTI for PDSCH-rep-mode may mean a newly defined or other RNTI defined in an existing standard system (eg, MCS-C-RNTI).

More specifically, MCS-C-RNTI can be used for robust PDSCH transmission. Based on the MCS-C-RNTI, the UE may consider a relatively robust MCS table. Accordingly, when the MCS-C-RNTI defined in the existing standard system is used as the RNTI for the PDSCH-rep-mode, the base station operating in the PDSCH-rep-mode can perform robust PDSCH transmission to the UE. .

As a specific example, when the base station indicates/sets the TCI state including two RS sets to the UE, the UE can expect that the PDSCH is transmitted by different TRP/beam(s). As a result, when (i) TCI state including two RS sets and (ii) RNTI for PDSCH-rep-mode (eg, MCS-C-RNTI) are simultaneously indicated/set, the UE is PDSCH-rep-mode Can be expected to be set.

As another specific example, when a TCI state including two RS sets is indicated/set to a UE in which PDSCH-rep-mode is set through higher layer signaling (eg, RRC signaling, etc.), the UE has PDSCH-rep-mode. It can be expected to be set.

2.1.2. PDSCH 반복 전송 모드의 활성화/비활성화를 동적으로 설정하는 방법 (Method on enabling/disabling PDSCH-rep-mode dynamically)2.1.2. How to dynamically enable/disable PDSCH repetitive transmission mode (Method on enabling/disabling PDSCH-rep-mode dynamically)

2.1.2.1. First PDSCH repeat transmission mode activation / deactivation setting method

The UE configured with the PDSCH-rep-mode is based on the determination that two CWs are enabled by DCI received from the base station, and the two CWs generated from the same information sequence have different TRP/beam(s). ). At this time, when the TCI state indicates/sets a plurality of RS sets, the terminal can expect that the RS set and CW have a mapping relationship in order.

For example, it is assumed that TCI state = {RS set#0, RS set#1} and CW#0, #1 are indicated/set to a UE configured with PDSCH-rep-mode. In this case, the terminal can expect that CW#0 is received from the beam indicated by RS set#0, and CW#1 is received from the beam indicated by RS set#1. Here, the beam may be replaced with a resource.

2.1.2.2. Method for setting activation/deactivation of the second PDSCH repeat transmission mode

The UE configured with PDSCH-rep-mode can expect that only one TRP/beam transmits one CW based on the determination that only one CW is activated by DCI received from the base station. Alternatively, the terminal configured with PDSCH-rep-mode, based on the determination that only one CW is activated by DCI received from the base station, CWs generated from the same information sequence are transmitted from a plurality of TRP/beam(s). You may not expect.

The above method can be equally applied to a terminal in which an operation mode other than PDSCH-rep-mode (eg, a normal PDSCH transmission mode such as PDSCH scheduled by DCI including a CRC scrambled with C-RNTI) is set.

2.1.3. 두 CW들과 두 RS sets 간 매핑 관계를 동적으로 설정하는 방법 (Method on configuring the relationship between two CWs and respectively two RS sets dynamically)2.1.3. Method on configuring the relationship between two CWs and respectively two RS sets dynamically

2.1.3.1. How to set up the first mapping relationship

The UE configured with PDSCH-rep-mode, maps between two CWs and two RS sets based on a field (eg, NDI, MCS, RV) for TB#2 (or transport block 2) in the received DCI. Relationships can be determined/assumed.

When the base station can dynamically indicate/set the relationship between the two CWs and the two RS sets, the field for TB#2 (eg, at least one field among NDI, MCS, and RV) is (TB It may be diverted to other uses (not for #2).

2.1.3.2. How to set up a second mapping relationship

Upon receiving the PDSCH-rep-mode, the UE expects that the PDSCH is received through one of the TRPs/beams corresponding to each of the two RS sets based on a specific deactivated CW (eg, CW#0 or CW#1). Can. At this time, a valid RS set is determined based on (i) an activated TB, or (ii) a DCI field corresponding to the deactivated TB (eg, NDI, MCS, RV), or (iii) TB# 2 (or TB#1) may be determined based on a DCI field (eg, NDI, MCS, RV).

The above setting method is 2.1.2. In the method of dynamically setting the activation/deactivation of the PDSCH repetitive transmission mode in the section, it is possible to set which RS set will transmit one valid CW. Additionally, the above method may be equally applied to a terminal in which an operation mode other than PDSCH-rep-mode (for example, a normal PDSCH transmission mode such as PDSCH scheduled by DCI including a CRC scrambled with C-RNTI) is set.

As a specific example, it is assumed that the base station sets/instructs TCI state = {RS set #0, RS set#1} to the UE. At this time, the terminal may assume/expect that CW#0/#1 is received through the beam/TRP indicated by RS set#0/#1, respectively.

Under the above assumption, when CW#1 is deactivated (that is, the MCS field corresponding to CW#1 (or TB#2) has a value of 26, and the RV field has a value of 1), CW#0 is RS set# It can be transmitted through a beam indicated by zero. On the other hand, CW#1 may not be transmitted through the beam indicated by RS set#1.

Conversely, when CW#0 is deactivated, CW#1 may be transmitted through the beam indicated by RS set#1, and CW#0 may not be transmitted through the beam indicated by RS set#0.

As another specific example, it is assumed that the base station instructs/sets TCI state = {RS set #0, RS set#1} to the UE, and CW#1 is deactivated. At this time, if the NDI field corresponding to CW#1 (or TB#2) has a value of 0, CW#0 may be transmitted through a beam indicated by RS set#0. On the other hand, in the above case, the UE may not expect that a DL signal can be transmitted in RS set#1.

On the other hand, when the NDI field has a value of 1, CW#0 may be transmitted through a beam indicated by RS set#1. On the other hand, in the above case, the terminal may not expect that a DL signal can be transmitted in RS set#0.

According to the above examples, the base station may instruct/set only the TRP/beam corresponding to a specific RS set to transmit the PDSCH, such as Dynamic Point Selection (DPS), using a TCI state composed of two RS sets. For example, in TCI state#0 = {RS set#0}, TCI state#1 = {RS set#1}, TCI state#2 = {RS set#0, RS set#1}, the base station is in TCI state Only #2 can be set for the terminal. Subsequently, the base station may implement TCI states #0 and #1 through whether or not CW (or TB) is instructed/set to the terminal. Therefore, the total number of TCI states that can be set by the base station to the UE can be reduced.

However, according to the 5G system, when the rank of a beam indicated by one RS set is 5 or more, two CWs must be transmitted through the one RS set. However, according to the above examples, it may be difficult to set/direct the above case to the terminal. That is, in order to implement the above case, the entire TCI state that the base station can set for the terminal is TCI state#0 = {RS set#0}, TCI state#1 = {RS set#1}, TCI state#2 = {RS set#0, RS set#1} must be included.

2.1.3.3. How to set up a third mapping relationship

A UE configured with PDSCH-rep-mode can expect CW#0 (or TB#1) to be always activated and CW#1 (or TB#2) to be activated or deactivated.

At this time, if CW#1 is deactivated, the UE can expect that the PDSCH is transmitted through only one of the TRPs/beams corresponding to each of the two RS sets. In this case, the RS set corresponding to TRPs/beams through which PDSCH (or CW#0 or TB#1) is transmitted is based on a DCI field (eg, NDI, MCS, RV) corresponding to CW#1 (or TB#2). Can be determined.

As a specific example, it is assumed that the base station instructs/sets TCI state = {RS set #0, RS set#1} to the UE, and CW#1 is deactivated. At this time, if the NDI field corresponding to CW#1 has a value of 0, CW#0 may be transmitted through a beam indicated by RS set#0. On the other hand, in the above case, the UE may not expect that a DL signal can be transmitted in RS set#1.

2.1.4. 두 CW들의 RV 필드간 관계를 설정하는 방법 (Method on configuring association between RV of CW#0 and RV of CW#1)2.1.4. Method of configuring association between RV of CW#0 and RV of CW#1

2.1.4.1. Method of establishing relationship between RV fields of first two CWs

The UE configured with PDSCH-rep-mode may determine the RV value of CW#1 based on (i) RV of CW#0 and/or higher layer configuration (eg, RRC, MAC-CE). At this time, the RV values that CW#0 and CW#1 may have may be set to satisfy at least one of the following conditions. For example, the RV values that CW#0 and CW#1 may have may be set to one of a plurality of combinations to satisfy at least one condition described below. At this time, two combination groups may be set, and each combination group may be set to satisfy Alt#1 and Alt#2.

-Alt#1: The two CWs indicated/assigned by one DCI are each self-decodable RV (eg RV #0, #3) and non-self-decodable ) RV (eg RV#1, #2). For example, the corresponding Alt 1 may correspond to the case where the RRC parameter is 0 in the following embodiment.

-Alt#2: Two CWs indicated/assigned by one DCI are self-decodable RVs (eg RV #0, #3) or self-decryption non-capable RVs (eg RV#1, #2) Maps to For example, the corresponding Alt 2 may correspond to the case where the RRC parameter is 1 in the following embodiment.

One combination group may include both a specific RV combination and a combination that is completely exclusive to the specific RV combination. For example, a specific combination group may include both {CW#0 with RV#0, CW#1 with RV#2} and {CW#0 with RV#3, CW#1 with RV#1}.

One combination group may include both a specific combination and a combination having a symmetrical relationship to the specific combination. For example, a specific combination group may include both {CW#0 with RV#0, CW#1 with RV#2} and {CW#0 with RV#2, CW#1 with RV#0}.

As described above, CW#1 may be generated from the same information sequence as CW#0. Accordingly, the RV value of CW#1 may be determined based on the RV value of CW#0.

When two CWs are set for a specific terminal, the DCI field provided by the base station to the specific terminal may include DCI fields for two TBs (eg, TB#1/#2) as shown in the table below. At this time, when two CWs are generated from the same information sequence, the NDI field for the second CW (or TB#2) may be unnecessary. In addition, as described above, when the RV for the second CW (or TB#2) is determined based on the RV for the first CW (or TB#1), for the second CW (or TB#2) The RV field may be unnecessary.

In this case, according to this document, the base station and the terminal may operate according to various embodiments as follows. At this time, various embodiments of the base station and the terminal may be implemented based on Table 25 below.

For example, in Table 25, when the RRC parameter value is 0 and the RV value of CW#0 is 0, the RV value of CW#1 may be determined as 2. As such, RV#0 and #2 are generally very low RV values between the two CWs, in which case the receiver can obtain a larger coding gain.

Subsequently, when the RV value of CW#0 is set to 3 for retransmission of a specific signal, the RV value of CW#1 may be determined to be 1. In this case, the UE may receive RV#0, #1, #2, and #3 corresponding to a specific information sequence from the base station through one retransmission. Accordingly, the receiver of the terminal can obtain the largest coding gain.

As another example, it can be seen from Table 25 that the fourth column is symmetric to the second column. For detailed description, it is assumed that when the RRC parameter value is set to 0, the terminal successfully receives CW#1 with RV#2, but does not receive CW#0 with RV#0. In this case, since most systematic codes are missing, it is highly likely that the terminal fails to decode the received signal.

However, when the corresponding signal is retransmitted and CW#1 with RV#0 is indicated for this, a signal corresponding to RV#0 may be received from a different TRP than before. In this case, as long as blockage does not occur between two TRPs and a terminal within a certain time, reception of a self-decodable CW can be ensured with one retransmission.

Consequently, spatial/beam diversity can be provided for self-decodable codes. Also, when the RRC parameter value is set to 1, space/beam diversity may be provided for the same self-decodeable code (eg, {CW#0 with RV#0, CW#1 with RV#) 3} &{CW#0 with RV#3, CW#1 with RV#0})

As another example, in Table 25, when the RRC parameter value is 1 and the RV value of CW#0 is 0, the RV value of CW#1 may be determined as 3. Since RV#0 and #3 share technically systematic codes, performance may be reduced in terms of coding gain, but the terminal is capable of self-decoding even if only one CW is received. Therefore, if there is no blockage between the two TRP and the terminal, the terminal can always receive a self-decoding CW.

At this time, when a specific signal is retransmitted and the RV value of CW#0 is set to 2 for this, the RV value of CW#1 may be determined as 1. According to this, the terminal can obtain all of RV#0, #1, #2, #3 of a specific signal (or information sequence) with one retransmission, and thus, can obtain the largest coding gain.

According to the above-described method, the base station does not need to separately define the RV bit (or field) of CW#1 in DCI. As a result, the base station can reduce the bit size signaled in the DCI, or use the corresponding bit field for other purposes.

Additionally, unlike the above-described example, the base station may indicate/set one of the rows in the table below through RRC parameters and/or DCI fields. For example, when the base station indicates/sets one of the rows in the table below through the DCI field, the base station determines the NDI field for the second TB defined in the DCI and/or the RV field for the second TB and/or One row (eg, instructing/setting 0 or 1) through one or more of the MCS fields for the second TB may be indicated/set to the terminal.

In addition, the RV value of CW#1 is determined based on the RRC parameter and the RV value of CW#0 as described above, or the paring index is based on DCI and/or RRC as shown in Table 26 below. Can be directed/set. In the present disclosure, the pairing index may mean an index indicating a configuration in which {RV value for CW#0, RV value for CW#1} are paired with each other.

For the following table, 2 bits in DCI and 1 bit in RRC signaling may be required. For example, for 2-bit information in DCI, an RV field for CW#0 (or CW#1) may be utilized.

2.1.4.2. Method of establishing relationship between RV fields of the second two CWs

A UE configured with PDSCH-rep-mode may not expect that the RV field (or RV value) of CW#1 (or TB#2) is indicated/set. In other words, for a terminal configured with PDSCH-rep-mode, the base station may not separately indicate/set the RV field (or RV value) of CW#1 (or TB#2). However, the terminal can expect that the starting point of CW#1 corresponds to the time immediately after CW#0 ends.

In PDSCH-rep-mode, from the signaling point of view, two codewords can be interpreted as being set/directed, but practically, two codewords are generated from the same information sequence, and are interpreted as one codeword depending on the situation. It may be. For example, two codewords are codewords generated from the same information sequence. If CW#0 is a self-decodable codeword (eg RV#0 or RV#3), CW#1 simply contains redundant bits. The codewords can be decoded from a terminal perspective. At this time, if CW#1 is composed of coded bits starting from immediately after CW#0 ends, the terminal can maximize coding gain. In this case, since the base station does not need to separately define RV for CW#1, signaling overhead can be reduced.

First, the UE can be set PDSCH-rep-mode by the base station. Earlier, 2.1.1. As described above in the section, the setting may be set through one or more of the following methods.

-1) It is set through upper layer signaling of the base station (eg, RRC and/or MAC-CE, etc.)

-2) (i) DCI including CRC scrambled with RNTI for PDSCH-rep-mode is indicated to the UE, and/or (ii) TCI state (or two) of the base station where the DCI includes two RS sets. TCI states), and/or (iii) PDSCH-rep-mode is set to the UE by higher layer signaling.

In other words, when PDSCH-rep-mode is set based on 1) of the above-described method, the UE additionally receives a PDCCH for scheduling PDSCH#1 and/or PDSCH#2 from TRP #1 or TRP #2. Can.

Or, when the PDSCH-rep-mode is set based on 2) of the above-described method, (i) included in the PDCCH scheduling PDSCH#1 and/or PDSCH#2 received from TRP #1 or TRP #2 Based on the determination that the DCI indicates the TCI state (or two TCI states) including the CRC scrambling in RNTI for PDSCH-rep-mode, and/or (ii) two RS sets, the UE performs PDSCH -rep-mode can be set.

In addition, based on at least one of the methods according to sections 2.1.2 to 2.1.4 described above, the UE transmits PDSCH #1 (or CW #0 or TRP #1 and/or TRP #2). TB #1) and/or PDSCH #2 (or CW #1 or TB #2).

As a more specific method for this, the methods disclosed in the above-described sections 2.1.2 to 2.1.4 may be applied.

In this document, an operation in which two different TRPs transmit CW generated from the same information sequence to each terminal may correspond to an operation for an ultra-reliable low latency communication (URLLC) system. In other words, for the URLLC service, the base station may transmit TB (or CW or PDSCH) having the same information to one UE through different TRPs. Conversely, the operation in which two different TRPs transmit CWs generated from different information sequences to the terminal may correspond to an operation for an enhanced Mobile BroadBand (eMBB) system.

Based on this, the base station signals whether the UE supports the URLLC service (the information of signals transmitted from the two TRPs is the same) or the eMBB service (the information of the signals transmitted from the two TRPs are different) to the UE according to the aforementioned methods. can do. As a specific method for this, RRC signaling, RNTI, and the like can be used.

At this time, when the base station supports the eMBB service, each TB fields in the DCI transmitted by the base station for scheduling may provide TB information for a signal transmitted from each TRP as in the prior art (eg, MCS, code rate) , RV, etc.).

On the other hand, if the base station supports the URLLC service, according to various methods according to the present disclosure, the UE may interpret the two TB fields in the DCI differently. For example, the UE may acquire only code rate information from some bit information of the second TB fields.

Also, as described above, RV information for each signal may be explicitly signaled or determined based on implicit rules, as illustrated in the present disclosure.

In this document, schemes for multi-TRP based URLLC (scheduled by single DCI at least) scheduled by a single DCI may include the following schemes.

(1) Scheme 1 (SDM)

At this time, n (n <= N _s ) TCI states in one slot can be set with overlapping time and frequency resource allocation (n (n<=N _s ) TCI states within the single slot, with overlapped time and frequency resource allocation).

(1-1) Scheme 1a

-Each transmission occasion may be a layer or a set of layers related to the same TB. At this time, each layer or set of layers may be associated with a set of one TCI and one DMRS port(s) (Each transmission occasion is a layer or a set of layers of the same TB, with each layer or layer set is associated with one TCI and one set of DMRS port(s).

-Single codeword with one RV can be used across all spatial layers or layer sets (Single codeword with one RV is used across all spatial layers or layer sets). From the UE perspective, different coded bits may be mapped to different layers or may be mapped to a layer set having the same mapping rule (From the UE perspective, different coded bits are mapped to different layers or layer sets with the same mapping rule as in Rel-15).

(1-2) Scheme 1b

-Single codeword with one RV can be used for each spatial layer or set of each layer (Single codeword with one RV is used for each spatial layer or layer set). RVs corresponding to each spatial layer or layer set can be the same or different.

-When the total number of layers is 4 or less, codeword-to-layer mapping may be applied (codeword-to-layer mapping when total number of layers <=4).

(1-3) Scheme 1c

-One transmission opportunity is: (i) one layer with the same TB as one DMRS port associated with multiple TCI state indices, or (ii) the same TB with multiple DMRS ports associated 1:1 with multiple TCI state indices One transmission occasion is one layer of the same TB with one DMRS port associated with multiple TCI state indices, or one layer of the same TB with multiple DMRS ports associated with multiple TCI state indices one by one ).

For Scheme 1, application of different MCS and/or modulation orders for different layers or layer sets can be considered (Applying different MCS/modulation orders for different layers or layer sets can be discussed).

(2) Scheme 2 (FDM)

At this time, n (n <= N _f ) TCI states in one slot may be set together with non-overlapping frequency resource allocation (n (n<= N _f ) TCI states within the single slot, with non- overlapped frequency resource allocation).

For Scheme 2, each non-overlapped frequency resource allocation is associated with one TCI state.

For Scheme 2, the same single/multiple DMRS port(s) can be associated with all non-overlapped frequency resource allocations. .

(2-1) Scheme 2a

Single codeword with one RV is used across full resource allocation. From the UE perspective, a common RB mapping (e.g., a codeword and inter-layer mapping method) can be applied across the entire resource allocation (From UE perspective, the common RB mapping (codeword to layer mapping as in Rel-15) is applied across full resource allocation).

(2-2) Scheme 2b

Single codeword with one RV is used for each non-overlapped frequency resource allocation. The RVs corresponding to each non-overlapped frequency resource allocation can be the same or different.

For Scheme 2, the application of different MCS and/or modulation orders for different non-overlapping frequency resource allocations can be considered (Applying different MCS/modulation orders for different non-overlapped frequency resource allocations can be discussed).

For example, in a single DCI-based plurality of TRP (eg, M-TRP) URLLC, for RV sequences applied to RBs sequentially associated with two TCI states, the RV _id indicated by DCI is 4 RV sequences It can be used to select one of the candidates.

As another example, in a plurality of TRP (eg, M-TRP) URLLC based on a single DCI, the following RV sequence candidates may be supported: (0,2), (2,3), (3,1), (1,0).

(3) Scheme 3 (TDM)

At this time, n (n <= N _t1 ) TCI states in one slot can be set together with non-overlapping time resource allocation (n (n<=N _t1 ) TCI states within the single slot, with non- overlapped time resource allocation).

For Scheme 3, each transmission opportunity of the TB can have (i) one TCI and (ii) one RV with mini-slot time granularity (Each transmission occasion of the TB has one TCI and one RV with the time granularity of mini-slot).

For Scheme 3, all transmission occasion(s) in a slot can use the common MCS of the same single/multiple DMRS port(s) (All transmission occasion(s) within the slot use a common MCS with same single or multiple DMRS port(s)).

For example, in a single DCI-based multiple TRP (eg, M-TRP) URLLC, for RV sequences applied to transmission opportunities sequentially associated with two TCI states, the RV _id indicated by DCI is 4 RVs. It can be used to select one of the sequence candidates.

In transmission opportunities, RV/TCI state can be the same or different among transmission occasions.

For Scheme 3, channel measurement interpolation across mini-slots with the same TCI index can be applied (Channel estimation interpolation across mini-slots with the same TCI index).

(4) Scheme 4 (TDM)

At this time, n (n <=N _t2 ) TCI states can be set in K (n<=K) different slots (n (n<=N _t2 ) TCI states with K (n<=K) different slots ).

For Scheme 4, each transmission opportunity of TB can have one TCI and one RV (Each transmission occasion of the TB has one TCI and one RV).

For Scheme 4, all transmission opportunity(s) across K slots can use a common MCS of the same single/multiple DMRS port(s) (All transmission occasion(s) across K slots use a common MCS with same single or multiple DMRS port(s)).

For Scheme 4, channel measurement interpolation across slots with the same TCI index can be applied (Channel estimation interpolation across slots with the same TCI index).

In the present disclosure, M TRP/panel based URLLC schemes can be compared in terms of (i) improved reliability, (ii) efficiency, and (iv) standard specification impact (M-TRP/panel based URLLC schemes shall). be compared in terms of improved reliability, efficiency, and specification impact).

Support for the number of layers per TRP may be discussed later (Support of number of layers per TRP may be discussed).

In the above disclosures, N _s , N _f , N _t1 , N _t2 are values set by the base station, respectively, and may be determined/set based on higher layer signaling and/or DCI.

Based on the above disclosures, multi-TRP based URLLC (scheduled by single DCI) scheduled by a single DCI may support the following.

For example, a multi-TRP-based URLLC scheduled by a single DCI may support operation according to scheme 1a.

As another example, the multi-TRP-based URLLC scheduled by a single DCI may support at least one of scheme 2a and scheme 2b. For this, the results of a system level simulator (SLS) and a link level simulator (LSL) simulation can be considered.

The terminal may receive downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from a base station (S1110, S1210). In response to this, the base station may transmit the DCI to the terminal (S1110, S1310).

In the present disclosure, the DCI may include information for two transmission blocks (TBs) corresponding to each of the two codewords. For example, the DCI may include information shown in Table 22.

In the present disclosure, each of the plurality of TCI states may be associated with one reference signal (RS) set.

The terminal may acquire mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station.

As an example applicable to the present disclosure, the first mode may include a multiple TRP-based ultra-reliable low latency communication (URLLLC) mode. And, as another example, the mode information may be related to one of the first mode or a second mode including multiple TRP-based enhanced mobile broadband (eMBB) modes.

As an example applicable to the present disclosure, the terminal may receive the mode information through higher layer signaling including radio resource control (RRC) signaling (S1120, S1220). In response to this, the base station may transmit the mode information to the terminal through higher layer signaling (S1120, S1320). At this time, the transmission and reception of the mode information may be performed in advance or later in the time domain than the transmission and reception of the DCI described above.

Alternatively, as another example applicable to the present disclosure, the terminal may be obtained based on a DCI including a cyclic redundancy check (CRC) scrambled with a radio network temporary identifier (RNTI) associated with the first mode. In other words, the terminal may acquire mode information related to the first mode without additional signaling.

The terminal is based on the DCI and the mode information, (i) data reception is scheduled from at least one TRP of a plurality of transmission reception points (TRPs) associated with the DCI, (ii) the plurality of It can be assumed that the data received from the TRPs of the based on the same information (S1130, S1230).

Subsequently, the terminal may acquire data information from at least one TRP among the plurality of TRPs based on the assumption (S1140, S1240). Correspondingly, the base station may transmit data information through at least one TRP of a plurality of transmission reception points (TRPs) by the DCI, based on the DCI and the mode information. (S1140, S1330).

As a specific example, (i) based on the DCI indicating that two codewords are activated, and (ii) the assumption, the terminal may share each physical downlink shared channel associated with two TRPs among the plurality of TRPs ( The data information may be acquired through a physical downlink shared channel (PDSCH) opportunity. In the present disclosure, the PDSCH occasion may mean a PDSCH (or PDSCH candidate) associated with the same information (eg, the same TB) associated with a plurality of TCI states (eg, two TCI states).

For example, redundancy version (RV) information for the two PDSCH opportunities is determined based on RV information associated with a first codeword included in the DCI, (i) the RV combination for the two PDSCH opportunities, or , (ii) RV information related to a second codeword is determined based on RV information related to a first codeword among RV information for the two PDSCH opportunities.

As another example, the redundancy version (RV) information for the two PDSCH opportunities is {RV#0, RV#2}, {RV#1, RV#3}, {RV#2, RV#0}, {RV #3, RV#1}.

As another specific example, (i) on the basis of the DCI and the assumption that one codeword of two codewords is activated, the terminal shares a physical downlink shared channel associated with one of the plurality of TRPs ( The data information may be acquired through a physical downlink shared channel (PDSCH) opportunity.

In this case, the PDSCH opportunity may be associated with one TCI state determined based on the DCI among the plurality of TCI states.

2.2. PDSCH 반복을 위한 단일 PDCCH 기반 시그널링 및 단말 동작 (Single PDCCH based signalling and UE behaviors for PDSCH repetition)2.2. Single PDCCH based signaling and UE behaviors for PDSCH repetition

2.2.1. 2 개의 CWs로부터 TBS를 결정하는 방법 (Method on determination of TB size from two CWs)2.2.1. Method on determination of TB size from two CWs

2.2.1.1. Method of determining the first TBS

The UE configured with the PDSCH-rep-mode may determine the TB size based on at least one of CW MCS, resource allocation, and number of layers having self-decoding RV (eg, RV#0, RV#3).

At this time, when the RVs of the two CWs are the same, the terminal may determine the TB size based on at least one of the MCS of CW#0 (or CW#1), the number of available REs, and the number of layers.

Or, when the RVs of the two CWs are RV#0 and RV#3, respectively, the terminal is based on at least one of the MCS of CWs having RV#0 (or RV#3), the number of available REs, and the number of layers. TB size can be determined.

In this case, a more specific TBS determination method may be based on the TBS determination method described above. And, the terminal can calculate the number of available REs based on the resources allocated to the terminal. The terminal may determine the number of layers based on the number of DMRS ports having an association relationship with the corresponding CW.

In the present disclosure, at least one of the two CWs, the MCS, the number of layers, and the number of available REs may be different. In this case, the TB size corresponding to each CW can be determined differently. However, according to the PDSCH-rep-mode described in the present disclosure, since the two CWs are generated based on the same TB, it may be ambiguous as to which CW reference the terminal should determine the TB size.

As a method for this, if one of the two CWs has a self-decodable RV value, the terminal should be capable of decoding only with the CW. Therefore, in selecting the CW for determining the size of the TB, the terminal according to the present disclosure can preferentially select the self-decodable RV value. In addition, since RV#0 generally performs better than RV#3, the terminal can select RV#0 in preference to RV#3.

2.2.1.2. Method of determining the second TBS

The UE configured with the PDSCH-rep-mode may determine the TB size based on at least one of CW#0 (or CW#1) MCS, resource allocation, and number of layers.

According to this operation example, the terminal may select a TB associated with a specific CW without additional signaling. Accordingly, signaling overhead can be reduced and overall system complexity can be reduced.

However, if (i) CW#0 and CW#1 correspond to RS set#0 and RS set #1 of the TCI state respectively, and (ii) the TB size is determined based on CW#0, the terminal sets the RS. The TB size may be determined based on the beam indicated by #0.

However, according to the present method, although the state of the beam indicated by set#1 is better than the state of the beam indicated by RS set#0, the UE determines the TB size based on the state of the beam indicated by RS set#0. As it has to be decided, a loss may occur in terms of throughput.

2.2.1.3. Method of determining the third TBS

The UE configured with the PDSCH-rep-mode may determine each TB size based on at least one of the MCS, resource allocation, and number of layers corresponding to each of the two indicated CWs. Subsequently, the terminal may select a large TB size from among the TB sizes corresponding to the two CWs calculated as the (representative) TB size.

For example, when the TB size of CW#0 is larger than the TB size of CW#1, the terminal may select the TB size of CW#0. According to this, the base station may be advantageous in terms of wave and throughput that can transmit more information to the terminal in one transmission.

2.2.1.4. 4th TBS Determination Method

The UE configured with PDSCH-rep-mode may determine the TB size corresponding to CW indicated by DCI and/or higher layer signaling (eg, RRC or MCA-CE, etc.).

As a specific example, when the NDI for the second TB of DCI is 0, the UE may select the TB corresponding to CW#0 as the (representative) TB. On the other hand, when the NDI for the second TB of DCI is 1, the terminal may select the TB corresponding to CW#1 as the (representative) TB.

In the above example, the NDI field for the second TB of DCI may be replaced with an RV field for the second TB of DCI or a specific field of a higher layer parameter.

2.2.1.5. 5th TBS decision method

The UE configured with PDSCH-rep-mode may determine the TB size based on CW#0 (or TB#1). In addition, the terminal may determine/assume CW and RS set mapping relationships based on the NDI and/or RV and/or MCS fields of CW#1 (or TB#2). In other words, the base station may indicate/set the CW and RS set mapping relationship to the terminal based on the NDI and/or RV and/or MCS field of CW#1 (or TB#2).

In the above example, the remaining bit information in the DCI can be reserved with a specific value. At this time, the reserved specific value may be determined/set based on the set value for deactivating CW.

Alternatively, in the above example, the terminal may determine the TB size based on CW1 (or TB#2) rather than CW#0.

Alternatively, the remaining bit information in the DCI may not be separately defined. In response to this, the terminal may not expect that the remaining bit information in the DCI is set. In this case, the base station can perform bit saving in DCI.

When two CWs are scheduled by a single PDCCH (eg, Single PDCCH with 2CW), the base station can set only one FRA (Frequency domain Resource Assignment) to the UE. In this case, when the frequency positions of CW#0 and CW#1 are indicated by dividing the FRA bit field into two, the MSC (Most Significant Bit) of the FRA is CW#0, and LSB (Least Significant Bit) of the FRA. It can be assumed that indicates/allocates the frequency positions of CW#1, respectively.

As a specific example, the terminal may determine the TB size based on CW#0. At this time, the LSB (3bits) and RV (2bits) fields of the MCS for CW#1 (or TB#2) except the NDI field for CW#1 (or TB#2) may be set to 0 (MCS MSB 2bits of can be used to indicate the modulation order of CW#1). In this case, the LSB 3bits and the RV 2bits of the MCS are known bits, and the terminal can use this to improve the decoding performance of the PDCCH. On the other hand, when the NDI value for CW#1 (or TB#2) is 0, the terminal can expect CW#0/#1 to be mapped to RS set#0/#1, respectively. Conversely, when the NDI value for CW#1 (or TB#2) is 1, the terminal can expect CW#0/#1 to be mapped to RS set#1/#0, respectively.

As another specific example, when determining the LSB and RV bits of the MCS, the UE may consider a CW disable option (eg, using a CW disable option, even if two RS sets are set in the TCI state). Only one RS set can be set to be valid). For example, MCS=26 (11010) and RV=1(01) may be set as signaling values for the CW disable option. In consideration of the binary values, the default values of LSB and RV of the MCS may be set to '010' and '01'. On the other hand, when the demodulation order of CW#1 is indicated/set by LSB 2bits of MCS, MSB 3bits and RV 2bits of MCS can be determined/set to '110' and '01', respectively.

As another specific example, in the above-described example, the RV field may indicate the modulation order of CW#1 instead of the MCS field. At this time, all 5 bits of the MCS field may be reserved as '11010'. However, when RV='01' and MCS='11010', CW#1 may be deactivated, and the default value of the MCS field may be set to a value other than '11010'. However, in order to indicate the deactivation of CW#1, the MCS field may have a value of '11010'.

According to the above method, the terminal can determine the position of known bits (eg, 5 bits) before decoding the signal, and the known bits can be used for signal decoding. And, the base station, through the NDI, can dynamically switch the relationship between the CW and RS set. Accordingly, flexibility to select TB according to a beam state may be provided.

However, in order to improve the PDCCH decoding performance of the UE according to the above method, it should be assumed that the PDSCH-rep-mode is set before the UE decodes the PDCCH. If, when the UE needs to determine whether the PDSCH-rep-mode through the TCI state and MCS-C-RNTI test, the UE is based on two hypotheses including PDSCH-rep-mode and non-PDSCH-rep-mode. Therefore, decoding of the PDCCH should be performed. Therefore, in the above case, in order to obtain performance improvement, a disadvantage of increasing the complexity of PDCCH decoding of the terminal may be caused.

2.2.2. 선택된 TB과 관련되지 않은 CW의 MCS 필드를 이용한 시그널링 방법 (MCS of CW which is not related to selected TB (or CW#1))2.2.2. Signaling method using MCS field of CW not related to the selected TB (MCS of CW which is not related to selected TB (or CW#1))

2.2.2.1. Signaling method using the first MCS field

The UE configured with PDSCH-rep-mode is not used for the TBS determination based on some bits (eg, MSB, LSB) and/or RV fields of the MCS field for CW that are not used for TBS determination. Can not determine the CW modulation order. At this time, the remaining bit information in the MCS field may be fixed to a specific value (eg reserve).

If, for a UE configured with PDSCH-rep-mode, TB size is determined based on at least one of MCS, RV, and resource allocation for CW#0, CW#1 in DCI transmitted by the base station to the UE ( Alternatively, a code-rate other than the demodulation order among the MCS fields for TB#2) may not be necessary. In other words, in this case, the base station may indicate/set only the modulation order to the UE using only some of the MCS fields (eg, 5 bits) in the DCI.

In Table 27 below, it is assumed that the MCS field has a size of 5 bits, and it is assumed that a portion marked with'XXX' can be set to arbitrary bits. This is because the part marked'XXX' does not affect the modulation order. As described above, based on Table 27 below, the UE may determine the modulation order based only on the MSB of the MCS field of CW that is not used when determining TBS.

At this time, when the part marked with'XXX' is fixed to a specific value (eg, '000'), the UE may perform PDCCH decoding by processing the value as a known bit when decoding the PDCCH. As a result, the UE can improve PDCCH decoding performance.

Alternatively, a part marked with'XXX' may not be separately defined. Through this, the base station can minimize bit information in DCI (bit saving). Alternatively, the base station may utilize the bit information for a different purpose than the existing one.

2.2.2.2. Signaling method using the second MCS field

The UE configured with PDSCH-rep-mode is based on NDI for TB#2 and/or some bits of MCS for TB#2 (eg, MSB, LSB) and/or RV field for TB#2, The modulation order of CW#1 can be determined. At this time, the remaining bits of the MCS field may be fixed to a specific value or reserved.

According to the above method, the terminal may determine the modulation order of CW#1 based on the DCI field corresponding to TB#2. The base station can fix the remaining bit information (eg, bit information not used among MCS fields) to a specific value. Accordingly, the terminal can operate more simply.

In a specific example, the MCS field corresponding to TB#2 may be redefined as shown in the following table. At this time, the terminal may determine the modulation order of CW#1 based on MSB 2 bits of the MCS field.

Alternatively, the terminal may determine the modulation order of CW#1 based on the RV for TB#2 in DCI based on Table 29 below.

2.2.3. ACK/NACK 피드백 방법 (ACK/NACK feedback)2.2.3. ACK/NACK feedback method (ACK/NACK feedback)

2.2.3.1. 1st ACK/NACK feedback method

When a terminal configured with PDSCH-rep-mode receives/directs two activated CWs from a base station, the terminal can feed back only a single ACK/NACK to the base station.

As described above, CW#0 and CW#1 may be generated from the same information sequence (or may be generated from the same TB). Therefore, even if two CWs are indicated/set to the terminal, the terminal can feed back only one ACK/NACK. Alternatively, in the above case, the base station may define only one ACK/NACK to the terminal.

2.2.3.2. Second ACK/NACK feedback method

The UE receiving the PDSCH through the PDSCH-rep-mode may determine whether to receive the PDSCH again based on the HARQ process number and/or NDI field associated with CW#0 (or CW#1).

Specifically, the UE that has received the PDSCH through PDSCH-rep-mode can receive one TB through DCI based on 2CW. At this time, the size of the TB may be determined based on CW#0. Therefore, when retransmission is performed, the base station sets the UE to determine whether to retransmit a specific PDSCH by indicating the same value as the previous value and notifying the UE of the HARQ process number without toggling the NDI field related to CW#0. I can order.

First, the UE can be set PDSCH-rep-mode by the base station. 2.1.1. As described above in the section, the setting may be set through one or more of the following methods.

In addition, based on at least one of the methods according to Sections 2.1.2 to 2.1.4, or Sections 2.2.1 to 2.2.3, which were previously described above, the UE may perform TRP #1 and/or TRP. PDSCH #1 (or CW #0 or TB #1) and/or PDSCH #2 (or CW #1 or TB #2) transmitted from #2 may be received.

Additionally, unlike the example of FIG. 14, the technical configuration according to the present disclosure may be extended to a configuration in which the UE receives PDSCH #1 and PDSCH #2 (without TRP distinction) from the base station. In other words, the features include: (i) the UE receives each PDSCH (eg, PDSCH #1 and PDSCH #2) through different TRPs, or (ii) the UE receives each PDSCH (eg, PDSCH #1 and PDSCH #2) may be applied to an operation for receiving through the same TRP.

In this case, PDSCH #1 (or CW #0 or TB #1) may be associated with the first TCI state among the plurality of TCI states, and PDSCH #2 (or CW #1 or TB #2) may be the plurality of TCI states. It may be related to the second TCI state among the TCI states.

Accordingly, as an example applicable to the present disclosure, RBs allocated to a PDSCH associated with a first TCI state in a TCI code point may be utilized for TBS determination with a single MCS indication. At this time, the same TBS and modulation order can be assumed for RBs allocated to the PDSCH associated with the second TCI state (The RBs allocated to the PDSCH associated with the first TCI state in the TCI code point are used for TBS determination with single MCS indication, while same TBS and modulation order can be assumed for the RBs allocated to PDSCH associated with the second TCI state).

As another example, the UE may determine the TB size associated with two CWs scheduled by a single PDCCH based on various methods disclosed in Section 2.2.1. In addition, the UE determines the modulation order for CW that is not related to the above-described TB size determination in 2.2.2. The decision can be made based on the various methods disclosed in the section. Accordingly, the UE may receive the two CWs based on the determined TB size and modulation order.

In addition, the UE can perform ACK/NACK feedback related to two CWs scheduled by a single PDCCH based on various methods disclosed in Section 2.2.3 and reception of a retransmitted signal based thereon.

As a more specific method for this, the above-mentioned sections 2.1.2 to 2.1.4 and 2.2. The methods disclosed in the section can be applied.

The terminal, from the base station, (i) a plurality of transmission configuration indicator (transmission configuration indicator; TCI) state (state), (ii) downlink containing information for two transport blocks (transport block; TB) Downlink control information (DCI) may be received (S1510, S1610). In response to this, the base station may transmit the DCI to the terminal (S1510, S1710).

As an example applicable to the present disclosure, the terminal may receive the mode information through higher layer signaling including radio resource control (RRC) signaling (S1520, S1620). In response to this, the base station may transmit the mode information to the terminal through higher layer signaling (S1520, S1720). At this time, the transmission and reception of the mode information may be performed in advance or later in the time domain than the transmission and reception of the DCI described above.

The terminal, based on the DCI and the mode information, (i) the DCI is scheduled to receive data from a plurality of transmission reception points (transmission reception points (TRPs)), (ii) is received from the plurality of TRPs It can be assumed that the data is based on the same information (S1530, S1630).

Subsequently, the terminal may determine a transport block size (TBS) related to the data based on the information related to one of the two TBs related to the DCI based on the assumption (S1540) , S1640).

As an example applicable to the present disclosure, the information related to the one TB is related to the TB associated with a codeword having self-decodable redundancy version (RV) information among two codewords related to the DCI. It may be related information.

In this case, the self-decodable RV information may include information related to RV index 0 or RV index 3.

As another example applicable to the present disclosure, the information related to the one TB may be information related to a codeword having an index of a first codeword among two codewords related to the DCI.

As another example applicable to the present disclosure, the information related to the one TB includes a physical downlink shared channel (PDSCH) associated with the first TCI state among the plurality of TCI states related to the DCI. It may be related information.

As another example applicable to the present disclosure, the information related to the one TB may be information related to a codeword in which a related TBS among two codewords related to the DCI is large.

As another example applicable to the present disclosure, the information related to the one TB may be information related to one codeword indicated by the base station among two codewords related to the DCI.

At this time, one codeword indicated by the base station may be determined based on new data indicator (NDI) information related to the second TB among the information for the two TBs in the DCI.

In the present disclosure, a modulation order of one TB is determined based on information related to the one TB, and a modulation order of another TB among the two TBs is 2 It may be determined based on information related to the other TB among the TBs.

At this time, the information related to the other TB may include at least one of the following.

-At least one bit information among NDI (new data indicator) information related to the other TB

-At least one bit information of MCS (modulation and coding scheme) information related to the other TB

-RV (redundancy version) information related to the other TB

Subsequently, the terminal may acquire data information from the plurality of TRPs based on the TBS (S1550, S1650).

Correspondingly, the base station may transmit data information to the terminal through a plurality of transmission reception points (TRPs) based on the DCI and the mode information (S1550, S1730). In this case, a transport block size (TBS) associated with the data information may be related to information related to one of the two TBs associated with the DCI.

In the present disclosure, the terminal may additionally transmit one acknowledgment response information to the base station in response to data information obtained from the plurality of TRPs.

2.3. PDSCH 반복 전송을 위하여 제2 TB의 DCI 필드에 기초한 자원 할당 및 DMRS 포트 지시 방법 (Methods on resource allocation and DMRS port indication using DCI fields of the second TB for PDSCH repetition) 2.3. Methods for resource allocation and DMRS port indication using DCI fields of the second TB for PDSCH repetition for PDSCH repetition transmission

2.3.1. 지역화된 (localized) PRGs 또는 인터리빙된 PRGs를 동적 또는 정적으로 지시하는 방법2.3.1. How to dynamically or statically indicate localized PRGs or interleaved PRGs

2.3.1.1. First PRG instruction method

In the UE configured with PDSCH-rep-mode, Y among a plurality of PRG modes (Y is a value from 1 to 4) PRG mode is set in advance through higher layer signaling (eg, RRC, MAC-CE, etc.). Can be expected. At this time, the plurality of PRG modes may include the following modes: overlapped PRGs (localized PRGs), interleaved PRGs (Interleaved PRGs) or TDMed PRGs (TDMed PRGs).

In addition, the UE configured with the PDSCH-rep-mode has at least one of New Data Indicator (NDI) for the second TB and/or Redundancy Version (RV) for the second TB and/or MCS fields for the second TB. Based on one, one can expect that one of the Y PRG modes is indicated. However, if one PRG mode is set/determined by higher layer signaling, the DCI fields may not be used for the purpose.

At this time, the PRG modes may be defined based on FIG. 7.

In another embodiment, without higher layer signaling, Y PRG modes may be defined by a standard spec. As an example, when only localized PRGs or interleaved PRGs are supported, the UE does not have upper layer signaling and one of the two PRGs is NDI (New Data) for the second TB. It may be expected to be indicated based on at least one of an Indicator) field and/or a Redundancy Version (RV) field for the second TB and/or an MCS field for the second TB.

2.3.1.2. Second PRG instruction method

A UE configured with PDSCH-rep-mode may expect localized PRGs based on upper layer signaling in which PRB bundling is associated with wideband. As a specific example, if the PRB bundling is set to wideband through upper layer parameters related to PRB bundling (for example, prb-BundlingType, dynamicBundling, etc.), the UE may expect localized PRGs.

Table 30 below shows the upper layer parameters related to the above-mentioned PRB bundling.

In the above table, prb-bundlingType may be associated (or may be indicated) with PRB bundle type and bundle size(s). When dynamic is selected, the actual bundleSizeSet1 or bundleSizeSet2 to be used may be indicated through DCI. Constraints for the bundleSize(Set) setting may be based on the vrb-ToPRB-Interleaver and rbg-Size settings. If the bundleSize(Set) value is absent (absent), the terminal may apply an n2 value (eg, 2) value.

Based on the upper layer parameters, the terminal may perform an operation based on the table below.

More specifically, when the UE receives the PDSCH scheduled by the PDCCH of DCI format 1_1 CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI, the upper layer parameter prb-BundlingType is set to'dynamicBundling'. When set, (i) the upper layer parameters bundleSizeSet1 and bundleSizeSet2

Set two sets of values, (ii) the first set is one or more of {2, 4, wideband}

You can take a value (take), (iii) the second set is one of {2, 4, wideband}

You can take a price.

When the PRB bundling size indicator signaled through DCI format 1_1 is set to '0', the UE receives PDSCH scheduled by the same DCI.

Within the second set of values

You can use values. PRB bundling size indicator signaled through DCI format 1_1 is set to '1'

When one value is set for the first set of values, the UE receives the PDSCH scheduled by the same DCI.

The two values for the first set of values are'n2-wideband' (two

Values correspond to 4 and wideband), the UE can use the following values when receiving the PDSCH scheduled by the same DCI: (i) the scheduled PRBs are continuous and the size of the scheduled PRBs is

If exceeded,

Can be equal to the scheduled bandwidth, or (ii) otherwise,

May be set to 2 or 4, which are the remaining set values, respectively.

When the UE receives the PDSCH scheduled by the PDCCH of DCI format 1_1 CRC scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI, if the upper layer parameter prb-BundlingType is set to'staticBundling',

The value may be set to a single value indicated by the upper layer parameter bundleSize .

(i) the nominal RBG size for a specific bandwidth part (BWP) for the UE is set to P=2, or (ii) in the upper layer parameter vrb-ToPRB-Interleaver in PDSCH-Config for the specific bandwidth part (BWP) for the UE . When the interleaving unit for VRB-to-PRB mapping is set to 2, the terminal

You may not expect the value to be set to 4.

When the PRB bundling is wideband, the UE can improve channel estimation performance. That is, when all RBs are adjacent, the UE can improve the estimation of the channel and lower the UE complexity associated with it. Therefore, based on that PRB bundling is set to wideband, the terminal can expect localized PRGs. Or, based on the PRB bundling is set to 2 or 4 rather than wideband, the UE may expect interleaved PRGs.

2.3.2. 동적으로 지역화된 PRGs 또는 인터리빙된 PRGs를 위한 RBs를 할당하는 방법 (Method on allocating RBs for localized PRGs or interleaved PRGs dynamically)2.3.2. How to allocate RBs for dynamically localized PRGs or interleaved PRGs (Method on allocating RBs for localized PRGs or interleaved PRGs dynamically)

2.3.2.1. First RB allocation method

The UE configured with the PDSCH-rep-mode is a frequency domain resource assignment (FRA) and/or a new data indicator (NDI) of the second TB and/or a redundancy version (RV) of the second TB and/or a second TB Based on the MCS field(s), it is possible to determine the frequency location and/or BW to which each CW is transmitted.

In the following disclosure, unless otherwise stated, for convenience of description, it may be assumed that the size of the PRG and the size of the RBG are the same. Alternatively, depending on the application example, the above-described operations may be applied even when the size of the PRG and the size of the RBG are different.

In the first example, it is assumed that the base station allocates 16 RBGs to the UE through the FRA. At this time, it is assumed that both RBG and PRG sizes are 4.

At this time, when'localized PRGs' are indicated/set by the base station to the UE, the two CWs can be transmitted on the upper 8 RBGs and the lower 8 RBGs, respectively, on a frequency basis. In this case, the UE determines whether CW#0 is transmitted from the upper 8 RBGs or the lower 8 RBGs, NDI (New Data Indicator) and/or RV (Redundancy Version) and/or MCS of the second TB. Based on, you can decide. CW#1 can be transmitted from other RBGs where CW#0 is not transmitted.

18 is a diagram illustrating an example of PRG for each codeword according to the present disclosure.

The first diagram (localized PRGs) of FIG. 18 shows the location of RBGs included in the localized PRG where CW#0/#1 is transmitted according to the NDI value. The second diagram (interleaved PRG) of FIG. 18 shows the location of RBGs included in the interleaved PRG where CW#0/#1 is transmitted according to the NDI value.

As shown in FIG. 18, RBG as well as PRG may be applied as a resource unit in which CW is interleaved (or alternated). When RBG is applied as the resource unit, as a specific example, when the RBG and PRG sizes are 4 and 2, respectively, the interleaved RB unit may be 4RB. For reference, FIG. 18 shows structures that are RBG-wise or PRG-wise interleaving, respectively.

In the second example, it is assumed that the base station allocates 17 RBGs to the UE through the FRA.

In this case, the 17RBG is difficult to be divided into exactly two groups. Accordingly, a specific CW can be transmitted and received through one RBG resource more than other CWs.

At this time, one RBG can allocate more resources to another CW having a higher MCS. In this case, more coding bits can be transmitted and received than in the opposite case (for example, when one RBG allocates more resources to another CW with a lower MCS than another CW).

Accordingly, according to the second example of the present disclosure, 9 RBGs may be assigned to CWs having a higher MCS, and 8 RBGs may be assigned to CWs having a (relatively) lower MCS.

19 is a diagram showing another example of PRG for each codeword according to the present disclosure.

In FIG. 19, it is assumed that 5 PRGs are directed/assigned to the UE, and the MCS of CW#1 is higher than that of CW#0. Unlike the example of FIG. 19, when the MCSs of two CWs are the same, more RBGs may be allocated to CW#0 (or CW#1).

In the third example, as a method for minimizing retransmission when blockage occurs in one of the two TRPs, each CW can be set to be self-decodable. On the other hand, in the case of CW with a low MCS, the number of coding bits that can be transmitted may be small compared to CW with a high MCS. Accordingly, from the viewpoint that each CW should be capable of self-decoding, it may be advantageous to transmit coding bits by allocating an additional RB to a CW with a low MCS.

For this, 8 RBGs may be allocated for the higher CW of the MCS, and 9 RBGs may be allocated for the lower CW.

20 is a diagram illustrating another example of PRGs for each codeword according to the present disclosure.

In FIG. 20, it is assumed that 5 PRGs are directed/assigned to the terminal, and the MCS of CW#1 is higher than that of CW#0. Unlike the example of FIG. 20, when the MCSs of two CWs are the same, more RBGs may be allocated to CW#0 (or CW#1).

In the fourth example, in the'interleaved PRGs' of the above-described second/third example, the method proposed in the first example (eg, signaling method based on the NDI (and/or RV) field value of TB#2, etc.) Based on which a relatively large number of RBGs are allocated, CWs may be signaled. For example, according to the method proposed in the above-described first example, by signaling the CW to be located at the top (on the frequency domain), a CW to which a relatively large number of RBGs are allocated may be signaled.

21 is a diagram illustrating another example of PRGs for each codeword according to the present disclosure.

According to the example shown in FIG. 21, in the case of interleaved PRGs, unlike the second/third example described above, an implicit rule based on MCS need not be separately defined.

According to various examples described above, the two CWs may be transmitted in different TRPs, respectively. In this case, depending on channel gain or multiplexing with other terminals, a preferred RB location in each TRP may be different. In this case, according to the above-described examples, the base station can dynamically set/direct the RB/RBG/PRG location transmitting CW through each TRP to the (dynamic) terminal. As a result, according to the examples described above, system throughput can be improved.

Additionally, in the above-described first example, the location of the frequency resource for CW#0 based on the NDI having a value of 0 (for example, the location of the PRG or RGB having the highest index) is the frequency resource for CW#1. It can be determined to be higher (or larger) than the position (eg, the position of the PRG or RGB having the highest index). Alternatively, based on the NDI with a value of 0, the position of the frequency resource for CW#0 (eg, the position of the PRG or RGB with the highest index) is the position of the frequency resource for CW#1 (eg, the highest It can be extended to be determined lower (or smaller) than the position of the PRG or RGB with the index.

In the above-described second/third example, RBG and PRG sizes are 4 and 2, respectively, and one RBG may be divided into two PRGs. In this case, both CWs can be assigned the same number (or the same size) of BWs.

22 is a diagram showing another example of PRG for each codeword according to the present disclosure.

In FIG. 22, the first diagram is a diagram showing a PRG configuration for each codeword when (RBG-wise Interleaving) NDI=0 and 5 RBGs are allocated to the UE and different CWs are transmitted in RBG units. As shown in FIG. 22, by dividing the third RBG#2 into two, both CWs can have the same BW.

In FIG. 22, the second diagram is a diagram showing a PRG configuration for each codeword when different CWs are transmitted in units of (PRG-wise Interleaving) PRG.

The second and third examples described above may have mutually exclusive relationships. Accordingly, RBG allocation according to MCS may be determined based on upper layer signaling (eg, RRC, MAC-CE) or DCI. For example, when the RBG distribution is determined by DCI, the RGB distribution configuration is based on New Data Indicator (NDI) of the second TB and/or Redundancy Version (RV) of the second TB and/or MCS field of the second TB. Can be determined.

2.3.2.2. Second RB allocation method

The UE configured with PDSCH-rep-mode determines (i) the primary frequency location based on the FRA (Frequency domain Resource Assignment) field, and (ii) the second based on the primary frequency location. Based on the TB's New Data Indicator (NDI) and/or the Redundancy Version (RV) of the second TB and/or the MCS field of the second TB, two secondary frequency locations to which two CWs are transmitted may be determined.

For the operation according to the present disclosure, a downlink resource allocation method defined by the following tables may be applied. However, the following items are only one downlink resource allocation method applicable to the present disclosure, and different downlink resource allocation methods may be applied for the operation according to the present disclosure.

In the first example, when the downlink resource allocation type 1 described above is applied, the terminal may first determine the primary frequency location based on the same/similar method as in the prior art. In addition, the terminal may determine two secondary frequency locations to which two CWs are to be transmitted, based on the RV of the second TB, based on the midpoint of the primary frequency BW.

In the present disclosure, an intermediate point of the primary frequency position may satisfy the following equation. In the following equation, N _BW , RV, and P may mean the BW of the primary frequency location, the RV value of the second TB, and the PRG size, respectively. In the following equation, K may be indicated/set based on 1, or BW of the primary frequency position, or higher layer signaling. Additionally, for convenience of description, an operation using the RV value for the second TB is described above, but the operation is an operation using at least one of RV and/or MCS and/or NDI fields of the second TB according to an embodiment. Can be extended.

23 is a diagram illustrating an example of PRG for each codeword based on RV values according to the present disclosure.

As illustrated in FIG. 23, when the number of PRGs is 7, a frequency resource location and BW for CW#0 and CW#1 may be determined based on the above equation. At this time, it is assumed that the K value is set to 1, but according to an embodiment, the K value may be set/directed to another value.

24 is a diagram showing another example of PRG for each codeword based on the RV value according to the present disclosure.

As illustrated in FIG. 24, when the number of PRGs is 6, whether to switch frequency resource positions for CW#0 and CW#1 may be determined based on NDI values.

25 is a diagram showing another example of PRG for each codeword based on the RV value according to the present disclosure.

According to the example of FIG. 25, the PRG configuration for each codeword in the case where the RV value is 2 and 3 may be the same.

When K=1, if the number of PRGs is small, the BW difference occupied by CW#0 and #1 can be largely set according to the RV value. On the other hand, if the number of PRGs is large, the difference in BWs occupied by each codeword can be set large. Therefore, the K value can be determined based on the number of BW and/or PRG. For example, the K value may be determined based on the total number of PRGs as shown in the following table. In the present disclosure, the matters disclosed in the following table are only examples, and the K value may be determined based on criteria/rules different from the following table.

2.3.3. 동적으로 TDM PRGs를 위한 슬롯을 할당하는 방법 (Method on allocating slots for TDMs PRGs dynamically)2.3.3. Method on allocating slots for TDMs PRGs dynamically

The UE configured with the PDSCH-rep-mode, the New Data Indicator (NDI) of the second TB (Transport Block) defined in DCI and/or the Redundancy Version (RV) of the second TB and/or the MCS field of the second TB Based on the like, the location of the slot/symbol to receive CW#1 after CW#0 reception may be determined.

In the present disclosure, the UE may be configured with a TDM PRG mode (eg, TDMed PRG mode) based on higher layer signaling and/or DCI from the base station. In other words, the terminal in which the PRG mode TDM set by the base station is set may perform an operation described later.

According to FIG. 26, a terminal (eg, a terminal in which a TDM PRG mode (eg, a TDMed PRG mode) is set based on higher layer signaling and/or DCI) receives 1-st CW after X slots after receiving 0-th CW) I can receive it.

In the present disclosure, the X value may be determined by (i) being set to one or more values in advance by higher layer signaling (eg, RRC, MAC-CE), and (ii) selecting one of the values set by DCI. have.

As an example for this, at least one of NDI of the second TB of DCI and/or RV of the second TB and/or MCS fields of the second TB may be utilized. As an example, {2, 4, 8, 16} values may be preset by higher layer signaling (eg, RRC), and 2 may be indicated/selected through DCI. In this case, the size of the DCI field to be utilized may be set (variably) based on the number of candidates set by higher layer signaling.

Additionally, in the present disclosure, the terminal can expect that the frequency positions of CW#0 and CW#1 are the same (for reduction of operational complexity).

2.3.4. PT-RS와 관련된 단말 동작 (UE behaviors related to PT-RS)2.3.4. UE behaviors related to PT-RS

First, in the present disclosure, a series of signals for estimating phase noise is called a PT-RS (Phase Tracking Reference Signal).

Basically, when the upper layer parameter DMRS-DownlinkConfig (or higher layer parameters DMRS-UplinkConfig) within the upper layer parameter phaseTrackingRS set, the UE can receive the PT-RS assuming that PT-RS are present. However, if (i) the layer parameter phaseTrackingRS is not set, or (ii) the upper layer parameter phaseTrackingRS is set, but a certain condition is satisfied (e.g., i) the scheduled Modulation and Coding Scheme (MCS) is less than or equal to ii ) If the number of scheduled RBs is less than a predetermined value, or iii) the related RNTI (Random Network Temporary Identifier) is RA-RNTI (Random Access RNTI), SI-RNTI (System Information RNTI), P-RNTI (Paging RNTI), etc. ), the terminal may assume that PT-RS does not exist.

In UL PT-RS, a UL PT-RS transmission method of a specific terminal may be different depending on whether transform precoding is enabled/disable. However, in common, the UL PT-RS can be transmitted only in a resource block for PUSCH. Characteristically, when transform precoding is disabled, UL PT-RS may be mapped to subcarriers for a DMRS port associated with a corresponding PT-RS port, and resources allocated for PUSCH transmission based on frequency density described below. Some of the blocks may be mapped to resource blocks.

In DL PT-RS, DL PT-RS can be transmitted only in a resource block for a PDSCH, can be mapped to subcarriers for a DMRS port associated with the corresponding PT-RS port, and based on the frequency density described below. Therefore, it may be mapped to some resource blocks among resource blocks allocated for PDSCH transmission.

As shown in FIG. 27, PT-RS may have a different (time) pattern according to an applied modulation and coding scheme (MCS) level.

At this time, time density 1 may correspond to Pattern #1 of FIG. 27, time density 2 may correspond to Pattern #2 of FIG. 27, and time density 4 may correspond to Pattern #3 of FIG.

The parameters ptrs-MCS1, ptrs-MCS2, ptrs-MCS3, and ptrs-MCS4 constituting Table 35 may be defined by higher layer signaling.

PT-RS according to the present invention may be mapped to one subcarrier for every 1 RB (Resource Block), 1 subcarrier for every 2 RBs, or 1 subcarrier for every 4 RBs. At this time, the frequency domain pattern (or frequency density) of the PT-RS as described above may be set according to the size of the scheduled bandwidth.

At this time, frequency density 2 corresponds to a frequency domain pattern in which PT-RS is mapped to one subcarrier for every 2 RBs, and frequency density 4 is frequency in which PT-RS is mapped to 1 subcarrier for every 4 RBs and transmitted. It can correspond to the area pattern.

In the above configuration, N _RB0 and N _{RB1, which} are the reference values of the scheduled bandwidth for determining the frequency density, may be defined by higher layer signaling.

Based on the PT-RS as described above, the terminal may operate as follows.

The UE configured with PDSCH-rep-mode is based on (i) two CWs being transmitted/received from different resources, or (ii) two CWs overlapped/transmitted from some resources, and received/set , PT-RS frequency location for each CW may be determined based on RBs transmitted by each CW.

The configuration can be equally applied to a terminal in which the PDSCH-rep-mode is set, as well as a terminal in which the mode is not set. That is, irrespective of the PDSCH-rep-mode setting, when the terminal indicates/sets that two CWs are transmitted from different resources from the base station, the terminal determines the PT-RS frequency position for each CW and each CW It can be decided based on the transmitted RBs.

For reference, the resource location (particularly, the frequency location) in which the DL PT-RS is transmitted and received can be determined based on the table below.

In the present disclosure, it can be assumed that TRP #1 and #2 transmit CW#0 and #1, respectively. At this time, when the base station instructs/sets that the number of (maximum) PT-RS ports is 2 to the UE, TRP#1 and #2 may transmit PT-RS to the UE, respectively.

In this case, when the RB location where the PT-RS is transmitted is determined based on the RBs allocated to the UE, a specific TRP may not transmit the PT-RS or the frequency density of the PT-RS may be lowered. As a result, CPE (Common Phase Error) estimation performance based on the signal received by the UE from the corresponding TRP may be lowered.

In FIG. 28, when the PRG size is 2 and the PT-RS frequency density is 4, a specific TRP (eg, TRP#2) may not transmit PT-RS. To solve this, the RB location of PT-RS for TRP#1 may be determined based on RBs allocated to TRP#1 (or RBs where CW#1 is transmitted). Similarly, the RB location of PT-RS for TRP#2 may be determined based on RBs allocated to TRP#2 (or RBs to which CW#1 is transmitted). To this end, the N RBs allocated for each TRP are (re)indexed from 0 to N-1, and an RB through which PT-RS is transmitted among the N RBs may be determined based on the above-described method.

The first picture (for example, the leftmost block) and the second picture (for example, the second block from the left) of FIG. 28 schematically illustrate a configuration in which PRGs (or RBGs) directed/set to the UE are grouped by each CW unit. The terminal, within each group, may determine the frequency location of the PT-RS based on a method of determining the existing PT-RS frequency location. Meanwhile, the second picture (for example, the second block from the left) and the third picture (for example, the third block from the left) of FIG. 28 schematically illustrate the configuration in which the PRGs (or RBGs) are restored to the original position.

2.3.5. 동적으로 특정 코드워드 (예: CW#1)의 DMRS 포트를 지시하는 방법 (Method on indicating DMRS ports of CW#1 dynamically)2.3.5. Method on indicating DMRS ports of CW#1 dynamically

2.3.5.1. First DMRS port indication method

When the PDSCH-rep-mode is set, the two CWs indicated by the DCI are transmitted from different resources (or, two CWs are transmitted from the same resource, or two CWs are transmitted from some overlapping resource) DMCH ports associated with each CW (eg, RRC, MAC-CE, etc.) and/or DCI may be determined.

As a specific example, DMRS port(s) for CW#0 is set/determined based on a first field of DCI (eg, antenna port(s) related field), and DMRS port(s) for CW#1 is At least one of the DCI second field (eg, antenna port(s) related field and/or NDI of TB#2 and/or MCS (of TB#2) and/or RV fields (of TB#2)) Field). As another example, DMRS ports information for CW#0 and CW#1 may be jointly encoded and set/corrected based on a specific field of DCI. For example, DMRS port information for CW#0 and CW#1 includes antenna port(s) related fields and/or NDI of TB#2 and/or MCS (of TB#2) and/or (of TB#2) ) It can be set / determined based on at least one of the RV fields.

At this time, when the terminal refers to the MCS table, even if two CWs are enabled, the terminal can expect that only one codeword is activated.

2.3.5. All the embodiments described in the section are not limited to the terminal in which the PDSCH-rep-mode is set, and can be extended regardless of whether the mode is set. For example, regardless of the PDSCH-rep-mode setting for the terminal, even if a TCI state including a plurality of RS sets or a plurality of TCI states is set/instructed to the terminal, the terminal is 2.3.5. It can operate based on all the embodiments described in the section. In addition, the DMRS ports of CW#1 are based on another DCI fields combination (eg, HARQ process number) or a newly defined DCI field instead of at least one of the NDI and/or MCS and/or RV fields of TB#2. It may be instructed/set to the terminal.

29, in the case of Disjoint PRGs, unlike the overlapped PRGs, two CWs may share some DMRS port index. In addition, the number of DMRS ports for each CW (eg # of layers) can be set identically or differently.

Therefore, based on the mapping method defined in the conventional standard (eg, CW2layer mapping rule), the operation of classifying the indicated DMRS ports for each CW may be inappropriate.

Consequently, according to the present disclosure, the base station needs to indicate to the terminal separate DMRS ports for each of CW#0 and CW#1. In addition, according to the UE behavior based on the conventional MCS table, when the number of CWs is 2, the UE uses a mapping method (eg, CW2layer mapping rule) defined in the conventional standard. Therefore, according to the present disclosure, the terminal can no longer use the corresponding operation. Accordingly, according to the present disclosure, even if two CWs are activated, the terminal may interpret the MCS table on the assumption that only one codeword is activated.

According to the first example (Indication of DMRS port(s) for each CW), DMRS ports for CW#0 may be determined based on the antenna port(s) related field. In addition, DMRS ports for CW#1 may be determined based on 3 bits of LSCS (Least Significant Bits) of MCS for

TB#

2 and 2 bits of RV for TB#2. According to the above example, 5 bits for indicating DMRS ports for CW#1 can be supported. Accordingly, according to the above example, most of the DMRS tables can be supported without adding a separate DCI field or changing the DMRS table (eg, Tables 14 to 16).

According to the second example (Indication of DMRS port(s) for each CW), in the first example described above, if the base station can set/instruct the modulation order of a specific CW through the RV field, MCS 5 bits of field can be used to configure/instruct DMRS ports for CW#1. In the case of Table 14, since 4 bits are required, the MSB 4 bits of the MCS can be used to set/instruct DMRS ports for CW#1. On the other hand, in the case of Table 15 and Table 16, since 5 bits are required, the entire bit information of the MCS can be used to set/instruct DMRS ports for CW#1.

According to the third example (an example for the case of Rank 5 or higher), the terminal may operate as follows.

When the terminal supporting the Rel-15 NR system, TB#1 and TB#2 are activated at the same time, a column for 2CWs in the DMRS table (for example, Two Codewords: Codeword 0 enabled, Codeword 1 enabled) It can work with reference. On the other hand, according to the above-described first/second example, even if two TBs are activated at the same time, the terminal operates by referring to a column for 1CW (eg, One Codeword: Codeword 0 enabled, Codeword 1 disabled) in the DMRS table. can do. Consequently, based on the current DMRS table, the first/second example cannot support rank 5 or higher.

Accordingly, in order to solve this problem, according to the third example, a column for 1CW in the conventional DMRS table (eg, One Codeword: Codeword 0 enabled, Codeword 1 disabled) may include information for DMRS ports of rank 5 or higher. have.

For example, in Table 15, value=31 in a column for 1CW (eg, One Codeword: Codeword 0 enabled, Codeword 1 disabled) may be defined to set/direct DMRS ports 0-4.

As another example, based on at least one of the antenna port(s) field and/or NDI of TB#2 and/or MCS (of TB#2) and/or RV fields (of TB#2), CW#0 The DMRS table referred to this can be expanded to 32 or more (eg 64, etc.) columns for 1CW (eg One Codeword: Codeword 0 enabled, Codeword 1 disabled).

As another example, based on at least one of NDI of TB#2 and/or MCS (of TB#2) and/or RV fields (of TB#2), the base station determines whether the terminal is a DMRS table for CW#0. You can set/direct either column for my 1CW (e.g. One Codeword: Codeword 0 enabled, Codeword 1 disabled) or 2 column for CW (e.g. Two Codewords: Codeword 0 enabled, Codeword 1 enabled) .

Meanwhile, according to the third example, CW#0 may substantially include two CWs. Likewise, CW#1 may include substantially two CWs.

However, this feature may not fit the principle or premise that CW#0 and CW#1 are generated from the same information sequence. Also, considering CW#0-0/CW#0-1 from TRP#0 and CW#1-0/CW#1-1 from TRP#1 (here, CW#0-0 and CW#1 -0 can be generated from the same information sequence), and the configuration can be awkward.

Therefore, rather than the above features, according to the third example, a configuration including CW#0/CW#1 from TRP#0 and CW#0'/CW#1' from TRP#1 may be natural. Therefore, in the third example, the base station can schedule the PDSCH transmitted by each TRP using two DCIs.

In the above-described configurations, CW#0 and CW#1 may be swapped with each other. In other words, according to another embodiment, the feature for CW#0 described above may be applied to CW#1, and the feature for CW#1 described above may be applied to CW#0.

In the above-described configurations, CW using DMRS ports set/directed by the antenna port(s) field is CW associated with a DCI field (eg, MCS, RV, NDI) used to determine TB size. Can be And, DMRS ports of another CW may be determined based on at least one of the MCS and/or RV and/or NDI fields of the other CW. For example, when the DCI field of TB#2 is used to determine the TB size, the DMRS ports of CW#1 may be determined based on the antenna port(s) field. And, DMRS ports of CW#0 can be set/directed based on the MCS field of TB#1 (eg, 5bits).

In the present disclosure, a configuration in which DMRS ports of two CWs are joint-encoded and indicated is as a method of joint encoding and indicating the'Indication of joint encoding of DMRS port(s)' among various examples in Section 2.3.5. for two CWs', one or more of the examples may be applied.

In the present disclosure, when maxNrofCodeWordsScheduledByDCI =1 is set by the base station, a field for TB#2 in DCI (eg, NDI, MCS, RV for TB#2) may not be defined. In this case, as an example, as a method of indicating DMRS ports related to a codeword, a method of jointly encoding and indicating DMRS ports of two CWs based on the antenna port(s) field may be applied. Alternatively, the UE receiving PDSCH-rep-mode may expect a separate DCI field for indicating DMRS ports of CW#1. To this end, the separate DCI field may be set by higher layer signaling (eg, RRC). At this time, the DMRS ports of CW#0 may be indicated/set based on the antenna port(s) field.

2.3.5.2. 2nd DMRS port indication method

The UE configured with PDSCH-rep-mode, the number of front-load symbols of CW#0 and CW#1 (eg # of front-load symbols) and/or the number of DMRS CDM groups without data (eg # of The DMRS CDM group(s) without data) can be expected to be identical. And, based on the DMRS ports indication method of CW#0/#1, the terminal can operate as follows:

(1) When each DMRS port(s) of CW#0/#1 is independently indicated (eg, Indication of DMRS port(s) for each CW), the DMRS table that the UE refers to CW#1 is CW It can be set/directed based on # of DMRS CDM group(s) without data of #0.

(2) When the DMRS ports of CW#0/#1 are jointly encoded and indicated (for example, Indication of joint encoding of DMRS ports for two CWs), the terminal is ## of front-load symbols of CW#0 and CW#1. And/or # of DMRS CDM group(s) without data.

As an example, it is assumed that different TRPs transmit signals (or layers) to one UE on the same OFDM symbol. At this time, in order to reduce terminal complexity and base station scheduling complexity, the base station can limit (or set) the # of front-load symbols and/or # of DMRS CDM group(s) without data of the two CWs to be the same. When designing a DMRS table or a joint-encoded DMRS table referenced for CW#1 by the UE based on the limitation, the number of bits required to indicate/set the DMRS port for CW#1 may be reduced.

In the first example (Indication of DMRS port(s) for each CW), the column for 1CW in Table 17 (e.g., One Codeword: Codeword 0 enabled, Codeword 1 disabled) depends on the number of front-load symbols (i ) value = 0 to 23 (If the number of front-load symbols is 1, a total of 24 rows), (ii) value = 24 to 57 (When the number of front-load symbols is 2, a total of 34 Row). At this time, when the number of front-load symbols is 2 is modified to 32 rows (for example, 2 rows among 34 rows are deleted, etc.), the base station uses 5 bits to determine the DMRS pots of CW#1. Can be directed/set.

Alternatively, if the number of DMRS CDM groups without data as well as the number of front-load symbols is the same, the maximum number of rows that the BS should distinguish through DCI may be set to 24 (eg, # of DMRS CDM group( s)=3, # of front-load symbols=2). In this case, without modification of the conventional DMRS table, the base station can indicate/set the DMRS ports of a specific CW using 5 bits of information.

In the second example (Indication of joint encoding of DMRS ports for two CWs), DMRS ports for each of the terminals CW#0/#1 may be jointly encoded and indicated/set as shown in the table below. At this time, referring to the following table, it can be confirmed that the two CWs have the same # of front-load symbols and/or # of DMRS CDM group(s) without data. Meanwhile, the following table shows a case where CW#0/#1 uses different DMRS ports (or when related/associated with different DMRS ports). Accordingly, the following table may be useful when the two CWs are transmitted on the same resource.

In the third example (Indication of joint encoding of DMRS ports for two CWs), unlike the second example described above, the table below shows that CW#0/#1 uses the same DMRS port(s) (or the same DMRS ports). And related/associated). Accordingly, the following table may be useful when the two CWs are transmitted from different resources.

2.3.5.3. 3rd DMRS port indication method

When the PDSCH-rep-mode is set, when two CWs are transmitted from the same resource or some overlapped resources, DMRS ports belonging to one CW#X (eg, X=0, 1) (or layers) can be expected to be included in one DMRS CDM group. In other words, the terminal may not expect a configuration in which DMRS ports (or layers) belonging to one CW#X (eg, X=0, 1) are included in a plurality of different DMRS CDM groups. In addition, the UE can expect that two CWs are defined in different DMRS CDM groups (eg, DMRS port(s) belonging to CW#0 belongs to CDM group#0, DMRS port(s) belongs to CW#1 ) Belongs to CDM group#1) In addition, in the above case, the terminal can expect only when the number of CDM groups is 2 or more.

Accordingly, according to the third DMRS port indication method of the present disclosure, a DMRS table referenced by the terminal for CW#0 and/or CW#1 based on the above features may be redesigned.

The above-described configuration can be applied only to the DMRS configuration type 1 with two DMRS CDM groups.

Alternatively, the above-described configuration may be modified as follows for the case of DMRS configuration type 2 with three DMRS CDM groups. Specifically, in the first DMRS port indication method described above, the terminal has a DMRS CDM group to which the DMRS ports (or layers) of CW#0 belong and a DMRS CDM group to which the DMRS ports (or layers) of CW#1 belong to each other. You can expect the difference. In addition, the terminal can expect only when the number of CDM groups is 2 or more. Based on the above features, the DMRS table that the UE refers to for CW#0 and/or CW#1 may be redesigned.

Specifically, when two CWs are transmitted on the same resource or overlapped on some resources, the DMRS ports (or layers) of the two CWs must belong to different DMRS CDM groups. For example, in Table 14, the base station sets value=9 (DMRS ports=0-2), 10 (DMRS ports=0-3), and 11 (DMRS ports=0,2) for CW#0 to the UE. / Can't be directed. In addition, in this case, two or more CDM groups are basically required. Therefore, the terminal can expect only when the number of CDM groups is 2 or more. When designing the DMRS table that the UE refers to for CW#0/#1 based on the above feature, the base station can reduce the number of DCI bits required.

In the first example (Indication of DMRS port(s) for each CW), when the above-described characteristics are applied to Table 14, the number of rows of the DMRS table that the UE refers to for CW#0/#1 Can be reduced to 6 (eg, value = 3 ~ 8 in Table 14).

Meanwhile, according to the first example, the base station may indicate/set DMRS ports for CW#0/#1 to the UE through separate DCI fields. As an example, the base station indicates (i) the DMRS ports of CW#0 based on some bits (eg, MSB 2bits) of the antenna port field, and (ii) the DMRS ports of CW#1 in the antenna port field. The remaining bits of (eg, LSB 2 bits) and/or RV of TB#2 and/or NDI (of TB#2) and/or MCS fields (of TB#2) are indicated/set based on at least one of Can.

In the second example (Indication of joint encoding of DMRS ports for two CWs), the DMRS ports that the UE refers to for each CW#0/#1 are jointly encoded with each other and can be defined as shown in the table below. . At this time, when the restriction that CW#0 and CW#1 cannot use the same DMRS port index is additionally applied, the number of rows in the corresponding table can be further reduced. As a result, the base station can further reduce the number of DCI bits needed to represent each of the two CWs DMRS ports. Meanwhile, the DMRS ports of the two CWs are provided in at least one of the antenna port(s) field and/or NDI of TB#2 and/or RV (of TB#2) and/or MCS fields (of TB#2). It can be indicated on the basis of.

Unlike the second DMRS port indication method described above, according to the third DMRS port indication method, the number of rows of the DMRS table referenced by the UE for CW#0 as well as CW#1 can be reduced.

2.3.5.4. 4th DMRS port indication method

When the resources to which two CWs are transmitted are identical or partially overlapped, the UE configured with PDSCH-rep-mode has (i) rank 2 or higher and/or (ii) the number of CDM groups 2 for the two CWs. It can be expected to consist only of the above cases.

In the present disclosure, the DMRS port indication method may be useful when DMRS ports of two CWs are jointly encoded and indicated/set based on one DCI field.

More specifically, when the PDSCH-rep-mode is set, a plurality of TRP/beams may transmit signals through different layers. Therefore, when PDSCH-rep-mode is set, the number of initial total layers is 2 or more. Accordingly, according to the present disclosure, a case where rank=1 among DMRS tables defined in the conventional standard (eg, Tables 14 to 17) may be excluded.

In addition, when DMRS ports are assigned to different TRP/beams, the two DMRS ports must belong to different CDM groups. Accordingly, according to the present disclosure, when the number of CDM groups in the DMRS table (eg, Tables 14 to 17) defined in the conventional standard is 1, it may also be excluded.

As a result, some of the bits in the antenna port(s) field having a size defined in the conventional standard (eg, 2 to 5 bits) may be used for other purposes. For example, among the bits in the antenna port(s) field, MSB (or LSB) X1 bits are used to indicate/set DMRS ports, and the remaining bit(s) is an RS set index to which MCS corresponding to TB#1 is applied. At least one of the indication/setting and/or the indication/setting of the RS set index to be mapped to CW#0 and/or the indication/setting of the modulation order of the RS set to which the MCS corresponding to TB#1 is applied and the other RS set is applied. Can be used for It is dedicated for the purpose of ordering modulation orders. The above configuration may be useful when maxNrofCodeWordsScheduledByDCI=1 is set to the terminal by the base station.

As a more specific example, when the resources to which two CWs are transmitted are the same, the terminal is based on the DMRS table defined as follows (for example, a table consisting only of rank 2 or higher in Table 14 and a CDM group number of 2 or higher), each CW The DMRS port(s) can be determined.

Based on the above table, only 2 bits of 4 bits allocated for the antenna port(s) field can be used to indicate/set DMRS ports for each CW.

Thus, the remaining 2 bits can be used for other purposes.

As an example, the first 1 bit of the remaining 2 bits can be used to determine the RS set to which MCS corresponding to TB#1 is applied. At this time, MCS and DMRS ports of CW#0 may be determined based on the MCS and antenna port(s) fields corresponding to TB#1.

As a specific example, when the value of the table is 3 and the first 1 bit is 1, CW transmitted through the beam associated with RS set#1 is assigned DMRS port#0, while the beam associated with RS set#0 is assigned. CW transmitted through can be assigned DMRS port #2.

Meanwhile, the remaining 1 bit may be utilized to indicate a relative modulation order based on the modulation order indicated by the existing MCS field. For example, the modulation order of CW#0 is 16QAM, and when the 1 bit is 0, the modulation order of CW#1 may be indicated/set to 16QAM. On the other hand, if the bit is 1, the modulation order of CW#1 can be indicated/set to 64QAM (or QPSK).

2.3.5.5. Method of indicating the fifth DMRS port

When the UE configured with the PDSCH-rep-mode indicates/sets that one of the two CWs is disabled through DCI from the base station, the UE receives a conventional DMRS table based on the antenna port field (for example, Table 14 to Based on Table 17), DMRS ports of the activated CW can be determined.

More specifically, when CW#1 is deactivated, the UE can expect that only one specific TRP/beam transmits CW#0 even though PDSCH-rep-mode is set. And, the terminal can expect that another TRP/beam does not transmit CW#1. Meanwhile, the DMRS ports of CW#0 may be determined based on a conventional DMRS table (for example, Tables 14 to 17) based on the antenna port field.

2.3.5.6. 6th DMRS port indication method

A UE configured with PDSCH-rep-mode is based on whether two CWs are transmitted on (i) different resources or (ii) on the same resource (or on some overlapping resources). It can be expected that the indication method of the DMRS ports and/or the DMRS tables referenced for the two CWs are different.

More specifically, when two CWs are transmitted on different resources, the same DMRS port(s) can be used for the two CWs. On the other hand, when two CWs are transmitted on the same resource, different DMRS port(s) should be used for the two CWs.

As a result, the DMRS ports indicating method of the two CWs and/or the DMRS table referenced by the UE may be set differently based on whether the time/frequency resources through which the two CWs are transmitted are the same or different.

The operation according to the present disclosure can be extended to maxNrofCodeWordsScheduledByDCI =2 as well as maxNrofCodeWordsScheduledByDCI =1 .

In the first example, as shown in the table below, the DMRS ports indication method for each CW may be set to be the same or different according to the resource allocation method of two CWs (eg, four combinations are possible).

In the above table, A means a method of indicating the DMRS port of each CW (Indication of DMRS port for each CW), and B is a method of indicating the DMRS ports for two CWs based on the joint encoding method (Indication of joint encoding of DMRS ports for two CWs).

More specifically, the A method may include a method of indicating the DMRS port(s) of each CW based on two or more DCI fields. As an example, the A method is 2.3.5.1. Methods according to the first to third examples of the section.

This method has the advantage of being able to indicate the DMRS port(s) of each CW, but there may be a disadvantage that the control signaling overhead is relatively large since two or more DCI fields are necessarily required.

On the other hand, the B scheme may include a method in which DMRS ports of two CWs encoded jointly are indicated/set based on one DCI field. As an example, the B method is 2.3.5.3. A method according to the second example in the section.

This method has a disadvantage in that the degree of freedom for setting DMRS ports is reduced compared to the A method, whereas the control signaling overhead is relatively small by using one DCI field.

Meanwhile, when two CWs are transmitted on different resources, the two CWs may be associated (associated) with the same DMRS port(s). Therefore, in this case, the A method may be preferred over the B method.

On the other hand, when two CWs are transmitted on the same resource, the two CWs cannot be associated (associated) with the same DMRS port(s), so the B method may be preferred over the A method.

In the second example, the DMRS table referenced by the UE for CW may be set differently according to the resource allocation method of two CWs.

2.3.5.3. The following DMRS table presented in the second example of the section is a DMRS table assumed for the case where two CWs are transmitted on the same resource. In this case, as shown in the table below, the DMRS ports allocated to two CWs at the same time must be different.

If two CWs are transmitted on different resources, the two CWs can share the same DMRS port(s). In this case, the DMRS table may be set as shown in the table below unlike the above table.

In FIG. 30, PDSCH#1 and PDSCH#2 may be composed of coded bits generated from the same information sequence (or generated from the same TB). Additionally, PDSCH#1 and PDSCH#2 in the corresponding configuration can be extended to CW#0 and CW#1, respectively.

First, the UE can be set PDSCH-rep-mode by the base station. Previously 2.1.1.1. As described above in the section, the setting may be set through one or more of the following methods.

-3) (i) when the base station instructs/sets two TCI states to the UE through DCI, and (ii) when the number of CDM (Code Division Multiplexing) groups allocated through DCI is 1

More specifically, the UE can determine the TB size for two CWs scheduled by a single PDCCH based on various methods disclosed in Section 2.2.1. In addition, the UE determines the modulation order for CW that is not related to the above-described TB size determination in 2.2.2. The decision can be made based on the various methods disclosed in the section. Accordingly, the UE may receive the two CWs based on the determined TB size and modulation order.

The UE receives ACK/NACK feedback for two CWs scheduled by a single PDCCH and a retransmitted signal based thereon. 2.2.3. This can be done based on the various methods disclosed in the section.

The UE may determine whether the frequency resource allocation scheme of two CWs scheduled by a single PDCCH is a localized PRGs or distributed PRGs scheme based on various methods disclosed in Section 2.3.1. In addition, the UE may perform signal reception and related operations instructing specific frequency resource allocation based on various methods disclosed in Section 2.3.2.

When the method in which two CWs are transmitted by the TDM method is indicated to the UE, the UE may perform signal reception and related operations instructing time resource allocation of the CWs based on various methods disclosed in Section 2.3.3. .

When two CWs are transmitted to the UE in different frequency domains, the UE may perform the operation of determining the PT-RS frequency location of each CW based on various methods disclosed in Section 2.3.4.

When two CWs are transmitted to the UE in different frequency domains or in the same frequency domain (or some overlapping frequency domains), the UE receives signal indicating DMRS port indices of each CW and related operations in Section 2.3.5. It can be performed based on the various methods disclosed.

As a more specific method for this, the methods disclosed in the above-described 2.1, 2.2, and 2.3 sections may be applied.

The terminal may receive downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from a base station (S3110, S3210). In response to this, the base station may transmit the DCI to the terminal (S3110, S3310).

The terminal may obtain mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station.

As an example applicable to the present disclosure, the terminal may receive the mode information through higher layer signaling including radio resource control (RRC) signaling (S3120, S3220). In response to this, the base station may transmit the mode information to the terminal through higher layer signaling (S3120, S3320). At this time, the transmission and reception of the mode information may be performed in advance or later in the time domain than the transmission and reception of the DCI described above.

The terminal, based on the DCI and the mode information, (i) data reception through a plurality of physical downlink shared channels (physical downlink shared channels; PDSCHs) is scheduled by the DCI, (ii) the plurality of It may be assumed that data received through PDSCHs is based on the same information (S3130, S3230).

Subsequently, the terminal may acquire resource information of the plurality of PDSCHs based on the assumption (S3140, S3240).

In the present disclosure, the DCI includes two TCI states, and the plurality of PDSCHs can include two PDSCHs.

In the present disclosure, based on the size of a precoding resource block group (PRG) bundling set for the terminal, (i) based on the size of the PRG bundling set as a wideband PRG (wideband PRG), the Resource information of a plurality of PDSCHs is determined based on a localized PRG (PRG) configuration, and (ii) based on the size of the PRG bundling set to 2 or 4, the resource information of the plurality of PDSCHs is interleaved PRG ( interleaved PRG).

If the feature is generalized, for a broadband PRG, first RBs among RBs allocated to the UE may be allocated to the first TCI state, and the remaining second RBs may be allocated to the second TCI state. In this case, the first RBs and the second RBs may be composed of consecutive RBs, respectively. Alternatively, for the PRG size set to 2 or 4, even PRGs among the PRGs allocated to the UE may be allocated to the first TCI state, and odd PRGs may be allocated to the second TCI state. .

As another example, the DCI may include information for two transport blocks (TBs). At this time, the resource information of the two PDSCHs is based on information related to one of the two TBs related to the DCI, SDM (Spatial Division Multiplexing), TDM (Time Division Multiplexing), FDM (Frequency Division Multiplexing) ).

As another example, the resource information of the two PDSCHs may include frequency resource information of each of the two PDSCHs determined based on information related to one TB of information for the two TBs included in the DCI. have.

As a specific example, one PRG of a localized PRG (PRG) or an interleaved PRG (interleaved PRG) that is localized to the UE based on the setting of a precoding resource block group (PRG) bundling set for the UE. The bundling mode can be set. In addition, frequency resource information of each of the two PDSCHs may be set differently based on (i) the set PRG mode and (ii) information related to the one TB.

At this time, when an odd number of resource block group (RBG) sizes are allocated to the terminal, resources may be allocated for the first/second PDSCHs as one of the following.

-(i) one RBG for the first PDSCH based on the first modulation and coding scheme (MCS) for the first PDSCH among the PDSCHs is higher than the second MCS for the second PDSCH among the PDSCHs Is assigned more

-(ii) One RBG is allocated for the second PDSCH based on the first MCS being higher than the second MCS.

-(iii) One RBG is allocated for the first PDSCH or the second PDSCH based on the fact that the first MCS is the same as the second MCS.

-(iv) Among the PDSCHs, one RBG is further allocated for one PBSCH determined based on information related to the one TB.

In the present disclosure, the information related to the one TB may be information related to the TB corresponding to the second order of the two TBs. At this time, the information related to the TB corresponding to the second order may include at least one of the following.

-NDI (new data indicator) related to the second TB

-RV (redundancy version) related to the second TB

-Modulating and coding scheme (MCS) related to the second TB

As another example, the resource information of the two PDSCHs may include time resource information of each of the two PDSCHs determined based on information related to one TB of information for the two TBs included in the DCI. have.

In this case, the time resource information may be related to an offset between time resource positions for the two PDSCHs. And, the frequency resources for the two PDSCHs can be set identically.

The terminal may acquire data information through the plurality of PDSCHs based on resource information of a plurality of PDSCHs determined based on the above method (S3150, S3250). In response to this, the base station may transmit the data information to the terminal through the resource indicated by the resource information of the plurality of PDSCHs (S3150, S3330).

In the present disclosure, when the terminal acquires the data information through the two PDSCHs, (i) a first demodulation reference signal for a first PDSCH based on antenna port-related information included in the DCI (demodulation) obtain reference signal (DMRS) port information, (ii) obtain second DMRS port information for a second PDSCH based on information related to one of the two TBs associated with the DCI, and (iii) ) Based on the first DMRS port information and the second DMRS port information, it may include receiving the data information through the first PDSCH and the second PDSCH.

In the present disclosure, the two PDSCHs are each associated with two TCI states, and the two PDSCHs can be received from different transmission reception points.

In the present disclosure, the terminal additionally, (i) based on the respective frequency resources for the two PDSCHs, the frequency location of the phase tracking reference signal (phase tracking reference signal) PT-RS for each PDSCH Determine independently, and (ii) PT-RS for each PDSCH may be received based on the frequency location of the PT-RS for each PDSCH.

In other words, based on RB resources allocated in association with each TCI state, a PT-RS resource mapping pattern for each PDSCH can be independently determined. Accordingly, the frequency density of PT-RS for each PDSCH can be determined based on the number of RBs associated with each TCI state.

2.4. 단일 코드워드를 위한 DCI 에 기초한 시그널링 방법2.4. DCI-based signaling method for a single codeword

2.1. Section 2.3. The above-described technical configurations in the section can be basically applied based on DCI for two codewords (eg, DCI format with two CWs ( maxNrofCodeWordsScheduledByDCI =2 )). More specifically, 2.1. Section 2.3. According to the clause, in the field of at least one of NDI for the second TB and/or MCS (for the second TB) and/or RV fields (for the second TB) included in the DCI for the two codewords Some bit(s) are used to indicate/set (i) CW-RS mapping relationship, (ii) FRA (Frequency domain Resource Assignment), (iii) CW#1 DMRS ports, and the remaining bit(s) It can be fixed to a specific value.

On the other hand, in this section, based on the DCI for a single codeword (for example, DCI format with single CW ( maxNrofCodeWordsScheduledByDCI = 1 )), unlike the above-described technology configurations, signaling identical to or reduced from the above-described technology configurations is described. How to apply will be explained in detail. According to the present disclosure, the base station adds a new field(s) to the DCI, described in 2.1. The same or reduced information as the above-described technical configurations in the section 2-3 can be delivered to the terminal. In addition, since the DCI size itself is reduced compared to the above-described technical configurations, the UE can also improve PDCCH reception performance.

This section describes the technology configuration based on DCI format with single CW. Therefore, only CW#0 can be defined in the technical configuration according to this section.

However, hereinafter, for convenience of description, a set of layer(s) transmitted from different TRPs is referred to as CW#0 and CW#1, respectively. At this time, CW#1 may mean coded bits generated from the same information sequence as CW#0, or coded bits generated from the same TB.

2.4.1. First signaling method

The terminal may expect two CWs (or a set of two layer(s)) when one or more of the following are satisfied:

-PDSCH-rep-mode is set

-maxNrofCodeWordsScheduledByDCI =1

-Multiple RS sets are indicated/set in TCI state

At this time, the terminal may determine the MCS and DMRS port(s) of one CW based on the MCS and antenna port(s) fields corresponding to TB#1. And, the terminal may determine the MCS and/or DMRS port(s) of another CW based on the (new) field associated with the modulation order and/or DMRS port(s). Then, the terminal may determine the TB size based on the MCS and antenna port(s) fields corresponding to TB#1.

For convenience of explanation, 2.4. In this section, it is assumed that maxNrofCodeWordsScheduledByDCI =1 is set by default, but the configuration can be equally extended even when maxNrofCodeWordsScheduledByDCI =2 is set.

2.4.2. Second signaling method

In the above-described first signaling method, the terminal sets the MCS and DMRS port(s) of CW (eg, CW#0) transmitted from the beam indicated by RS set#0 to MCS and antenna corresponding to TB#1, respectively. It can be determined based on the port(s) fields. And, the terminal is the (new) DCI field associated with the modulation order and/or DMRS port(s) of the modulation order and/or DMRS ports of CW (eg CW#1) transmitted from the beam indicated by RS set#1. It can be determined based on (s).

As a specific example, the UE may determine the TB size based on at least one of DCI fields (eg, NDI, MCS, RV) corresponding to TB#1. In addition, the terminal may determine the MCS and DMRS port(s) of CW#0 transmitted from the beam indicated by RS set#0 based on the MCS and antenna port(s) fields corresponding to TB#1, respectively. And, the terminal may determine the modulation order and/or DMRS port(s) of CW#1 transmitted from the beam indicated by RS set#1 based on the new DCI field(s).

2.4.3. Third signaling method

In the first signaling method described above, the terminal can expect that the RS set to which information based on the MCS and antenna port(s) fields corresponding to TB#1 is applied is determined based on the new DCI field. And, the terminal may determine the modulation order and/or DMRS port(s) of the RS set different from the RS set based on the (new) DCI field(s) associated with the modulation order and/or DMRS port(s). . In this case, the (new) DCI field(s) may be defined as an entire antenna port(s) field defined in a conventional standard or a bit(s) of a corresponding field.

More specifically, according to the second signaling method, the TB size may be determined according to the state of the beam indicated by RS set#0. In this case, even if the state of the beam indicated by RS set#1 is good, the TB size is determined according to the state of the beam indicated by RS set#0, from the perspective of throughput. There may be a disadvantage that loss may occur. When considering such a disadvantage, a third signaling method may be considered instead of the second signaling method.

As a specific example, when the DCI field value (to determine the RS set) is set to '0', the UE TB# each of the MCS and DMRS port(s) of CW transmitted from the beam indicated by RS set#0. It can be determined based on the MCS and antenna port(s) fields corresponding to 1. And, the terminal sets the modulation order and/or DMRS port(s) of CW transmitted from the beam indicated by RS set#1 to the (new) DCI field(s) associated with the modulation order and/or DMRS port(s). You can decide based on that.

Or, when the DCI field value (to determine the RS set) is set to '1', the terminal TB#1 each of the MCS and DMRS port(s) of CW transmitted from the beam indicated by RS set#1. It can be determined based on the MCS and antenna port(s) fields. And, the terminal is based on the (new) field(s) associated with the modulation order and/or DMRS port(s) of the modulation order and/or DMRS port(s) of CW transmitted from the beam indicated by RS set#0. You can decide.

2.4.4. 4th signaling method

In the first signaling method described above, the terminal may determine the MCS and DMRS port(s) of CW#0 based on the MCS and antenna port(s) fields corresponding to TB#1, and the terminal The MCS and DMRS port(s) of CW#1 can be determined based on the modulation order and/or (new) DCI field(s) associated with the DMRS port(s). In addition, the UE has a (new) DCI field that determines a mapping relationship between each CW and two RS sets (eg RS set#0/#1) among two CWs (eg CW#0/#1). Can be expected to be set (e.g. (CW#0-RS set #0, CW#1-RS set #1), or (CW#0-RS set #1, CW#1-RS set #0) mapping Determine the relationship). In this case, the (new) DCI field(s) may be defined as an entire antenna port(s) field defined in a conventional standard or a bit(s) of a corresponding field.

More specifically, according to the second signaling method, the TB size may be determined according to the state of the beam indicated by RS set#0. In this case, even if the state of the beam indicated by RS set#1 is good, the TB size is determined according to the state of the beam indicated by RS set#0, from the perspective of throughput. There may be a disadvantage that loss may occur. When considering such a drawback, a fourth signaling method may be considered instead of the second signaling method.

As a specific example, the terminal may determine the MCS and DMRS port(s) of CW#0 based on the MCS and antenna port(s) fields corresponding to TB#1, respectively. And, the UE can determine the modulation order and/or DMRS port(s) of CW#1 based on (added) modulation order and/or (new) DCI field(s) associated with DMRS port(s). .

On the other hand, when the DCI field value that determines the mapping relationship between two CWs and two RS sets is set to '0', the terminal receives CW#0/#1 from the beam indicated by RS set#0/#1, respectively. It can be expected to be transmitted. Conversely, when the DCI field value for determining the mapping relationship between the two CWs and the two RS sets is set to '1', the terminal indicates that each of CW#0/#1 is indicated by RS set#1/#0. It can be expected to be transmitted from the beam.

2.4.5 Fifth Signaling Method

A UE configured with PDSCH-rep-mode and maxNrofCodeWordsScheduledByDCI =1 (or 2) can expect that the maximum number of layers transmitted from each TRP/beam is 1. Alternatively, the terminal may expect that the number of layers indicated/set to the terminal is 2 or more. In this case, all or some bits related to the antenna port(s) field in DCI may be associated with at least one of the functions specified below.

-As an example, all or some bits related to the antenna port(s) field may be utilized to indicate/set the DMRS port(s) of CW#0 and CW#1, respectively. Alternatively, all or some bits related to the antenna port(s) field may be utilized to indicate/set DMRS ports of CW#0 and CW#1 jointly encoded.

-As another example, all or some bits related to the antenna port(s) field are additionally modulated in addition to the mapping relationship between two RS sets and CWs transmitted from different TRP/beams and/or MCS corresponding to TB#1. Can be used to indicate/set order.

In the present disclosure, PDSCH-rep-mode may be supported for a service requiring high reliability (eg, URLLC). In this case, the number of layers transmitted by each TRP may be fixed to 1.

Meanwhile, the antenna port(s) field provided by NR Rel-15 may simultaneously inform the UE of rank information as well as DMRS port index. Accordingly, when the rank is limited to 1, some bits of the antenna port(s) field may be used for other purposes (eg, signaling/instructing other information).

In the first example, when two CWs are transmitted on the same resource, DMRS ports of the two CWs may be set differently from each other. Accordingly, the above-described configuration and 2.3. Based on the above-described configuration in the section, the antenna port(s) field may be newly defined as follows.

In this case, the base station can utilize only the MSB 3 bits of the antenna port(s) field of size 5 bits to indicate one value according to the above table. Accordingly, the base station can utilize the remaining 2 bits for other purposes. For example, the base station may signal/direct/set the mapping relationship between two RS sets and CWs transmitted from different TRP/beams based on the fourth bit of the antenna port(s) field, and the antenna port(s). ) Based on the fifth bit of the field, additional modulation order information other than MCS may be signaled/signed/set.

Alternatively, the fifth bit may be used for signaling/instruction/setting the modulation order of CW#1 based on the modulation order of CW#0.

As an example, it is assumed that the modulation order for CW#0 is indicated/set to 16QAM. At this time, if the fifth bit is 0 based on the following table, the terminal may determine the modulation order for CW#1 as 16QAM. Alternatively, when the fifth bit is 1, the terminal may determine the modulation order for CW#1 to 64QAM.

If the difference between the modulation orders of the two CWs is too large (eg CW#0: QPSK, CW#1: 64QAM), considering that it is not a great advantage for the base station to transmit two CWs at the same time, the above method is significant. can do.

Alternatively, when the 4th and 5th bits signal/instruct/set the modulation order of CW#1, the terminal may determine the modulation order of CW#1 based on the following table.

In the second example, when two CWs are transmitted on different resources, DMRS ports of the two CWs may be set identically. At this time, the above-mentioned 2.3. Based on the section configuration, the antenna port(s) field can be newly defined as follows.

Subsequently, the UE may receive a PDCCH including a DCI scheduling signal transmission from TRP #1 and TRP #2 (eg, PDSCH #1 and PDSCH #2, or CW #1 and CW #2). In FIG. 34, for convenience of description, a configuration in which a UE receives a PDCCH from TRP #1 is illustrated, but according to an embodiment, the UE may receive the PDCCH from TRP #2 or another entity.

In the present disclosure, DCI format with single CW based on RRC parameter maxNrofCodeWordsScheduledByDCI =1 may be applied to the PDCCH. However, the PDCCH applicable to the present disclosure is not limited to the above example, and can be extended to a DCI format based on the RRC parameter maxNrofCodeWordsScheduledByDCI =2.

2.4. Based on the various signaling methods described above in the section, the UE is configured for TB size and/or MCS and/or modulation for a scheduled signal (eg PDSCH #1 and PDSCH #2, or CW #1 and CW #2). Modulation order and/or DMRS port and/or mapping between RS sets and CWs can be determined. More specifically, the UE is based on each field value of DCI composed of DCI format with single CW, 2.4. Based on the various signaling methods described in the section, TB size and/or MCS and/or modulation order for a scheduled signal (e.g., PDSCH #1 and PDSCH #2, or CW #1 and CW #2) ( modulation order) and/or DMRS port.

Subsequently, based on the previously determined information, the UE may receive a scheduled signal from TRP #1 and TRP #2, respectively. At this time, signals received from each TRP may include coded bits generated from the same information sequence or coded bits generated from the same TB.

The UE, from the base station, (i) includes two transmission configuration indicator (transmission configuration indicator) (TCI) states (states), (ii) a downlink including information for one transport block (transport block; TB) Downlink control information (DCI) may be received (S3510, S3610). In response to this, the base station may transmit the DCI to the terminal (S3510, S3710).

In the present disclosure, the DCI may include information for only one TB (eg, information for 1 TB, not 2 TB). To this end, the UE may receive upper layer signaling (eg, upper layer signaling where maxNrofCodeWordsScheduledByDCI is n1) to set the maximum number of codewords scheduled by one DCI to 1 from the base station. In response to this, the base station may transmit the upper layer signaling to the terminal.

In the present disclosure, each of the two TCI states may be associated with one set of reference signals (RS).

The terminal may obtain setting information related to a first mode in which a plurality of data based on the same information is transmitted from the base station.

As an example applicable to the present disclosure, the first mode may include a multiple TRP-based ultra-reliable low latency communication (URLLLC) mode. And, as another example, the configuration information may be related to one of the first mode or a second mode including multiple TRP-based enhanced mobile broadband (eMBB) modes.

As an example applicable to the present disclosure, the terminal may receive the configuration information through higher layer signaling including radio resource control (RRC) signaling (S3520, S3620). In response to this, the base station may transmit the configuration information to the terminal through higher layer signaling (S3520, S3620). At this time, the transmission and reception of the setting information may be performed in advance or later in the time domain than the transmission and reception of DCI described above.

Or, as another example applicable to the present disclosure, the terminal obtains the configuration information based on DCI including a cyclic scrambled CRC (Cyclic Redundancy Check) with a radio network temporary identifier (RNTI) associated with the first mode. can do. In other words, the terminal may acquire setting information related to the first mode without additional signaling.

The terminal assumes that, based on the DCI and the configuration information, (i) data reception on two PDSCHs is scheduled by the DCI, and (ii) data received on the two PDSCHs is based on the same information. It can be done (S3530, S3630).

Subsequently, the terminal may acquire MCS and DMRS port information for the two PDSCHs from one or more fields in the DCI based on the assumption (S3540, S3640). More specifically, the terminal, based on the assumption, from one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) for the first PDSCH among the two PDSCHs and the first 1 demodulation reference signal (DMRS) port information, and (ii) second MCS and second DMRS port information for a second PDSCH among the two PDSCHs may be obtained.

In the present disclosure, the second MCS, the first DMRS port information, and the second DMRS port information may be obtained from one field in the DCI. For example, the one field may be an antenna ports field in the DCI.

In the present disclosure, based on the two PDSCHs received on the same resource, the first DMRS port information and the second DMRS port information obtained from the one field may be set differently. In this case, the first DMRS port information and the second DMRS port information may be set to be included in different Code Division Multiplexing (CDM) groups. Alternatively, the first DMRS port information and the second DMRS port information may be jointly encoded and obtained from the one field. In this case, the second MCS may be obtained from one or more bits, not bits related to the first DMRS port information and the second DMRS port information, among a plurality of bits in the one field.

In the present disclosure, based on the two PDSCHs received on different resources, the first DMRS port information and the second DMRS port information obtained from the one field may be set identically.

The terminal may acquire data information through the two PDSCHs based on the information obtained based on the above method (S3550, S3650). In response to this, the base station may transmit the data information to the terminal through the two PDSCHs (S3550, S3730).

It is clear that examples of the proposed method described above may also be included as one of the implementation methods of the present disclosure, and thus may be regarded as a kind of proposed methods. Further, the above-described proposed schemes may be implemented independently, but may also be implemented in a combination (or merged) form of some suggested schemes. Whether or not the proposed method is applied (or information on the rules of the proposed methods) can be defined so that the base station notifies the UE through a predefined signal (eg, a physical layer signal or a higher layer signal). have.

3. 본 개시가 적용되는 통신 시스템 예3. Example communication system to which the present disclosure applies

Without being limited thereto, various descriptions, functions, procedures, suggestions, methods and/or operational flowcharts of the present disclosure disclosed in this document may be applied to various fields requiring wireless communication/connection (eg, 5G) between devices. have.

Hereinafter, with reference to the drawings will be illustrated in more detail. In the following drawings/description, the same reference numerals may exemplify the same or corresponding hardware blocks, software blocks, or functional blocks, unless otherwise indicated.

38 illustrates a communication system 1 applied to the present disclosure.

Referring to FIG. 38, the communication system 1 applied to the present disclosure includes a wireless device, a base station and a network. Here, the wireless device means a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), Long Term Evolution (LTE)), and may be referred to as a communication/wireless/5G device. Although not limited to this, the wireless device includes a robot 100a, a vehicle 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a hand-held device 100d, and a home appliance 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous driving vehicle, a vehicle capable of performing inter-vehicle communication, and the like. Here, the vehicle may include a UAV (Unmanned Aerial Vehicle) (eg, a drone). XR devices include Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) devices, Head-Mounted Device (HMD), Head-Up Display (HUD) provided in vehicles, televisions, smartphones, It may be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, or the like. The mobile device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), a computer (eg, a notebook, etc.). Household appliances may include a TV, a refrigerator, a washing machine, and the like. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may also be implemented as wireless devices, and the specific wireless device 200a may operate as a base station/network node to other wireless devices.

The wireless devices 100a to 100f may be connected to the network 300 through the base station 200. AI (Artificial Intelligence) technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI server 400 through the network 300. The network 300 may be configured using a 3G network, a 4G (eg, LTE) network, or a 5G (eg, NR) network. The wireless devices 100a to 100f may communicate with each other through the base station 200/network 300, but may directly communicate (e.g. sidelink communication) without going through the base station/network. For example, vehicles 100b-1 and 100b-2 may communicate directly (e.g. Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication). Further, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/

connections

150a, 150b, and 150c may be achieved between the wireless devices 100a to 100f/base station 200 and the base station 200/base station 200. Here, the wireless communication/connection is various wireless access such as uplink/downlink communication 150a and sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, IAB (Integrated Access Backhaul)). It can be achieved through technology (eg, 5G NR), and wireless devices/base stations/wireless devices, base stations and base stations can transmit/receive wireless signals to each other through wireless communication/

connections

150a, 150b, 150c. For example, wireless communication/

connections

150a, 150b, 150c may transmit/receive signals over various physical channels.To this end, based on various proposals of the present disclosure, for the transmission/reception of wireless signals, At least some of various configuration information setting processes, various signal processing processes (eg, channel encoding/decoding, modulation/demodulation, resource mapping/demapping, etc.), resource allocation processes, etc. may be performed.

4. 본 개시가 적용되는 무선 기기 예4. Examples of wireless devices to which the present disclosure applies

39 illustrates a wireless device that can be applied to the present disclosure.

Referring to FIG. 39, the first wireless device 100 and the second wireless device 200 may transmit and receive wireless signals through various wireless access technologies (eg, LTE and NR). Here, {the first wireless device 100, the second wireless device 200} is {wireless device 100x, base station 200} and/or {wireless device 100x), wireless device 100x in FIG. }.

The first wireless device 100 includes one or more processors 102 and one or more memories 104, and may further include one or more transceivers 106 and/or one or more antennas 108. The processor 102 controls the memory 104 and/or transceiver 106 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 102 may process information in the memory 104 to generate the first information/signal, and then transmit the wireless signal including the first information/signal through the transceiver 106. In addition, the processor 102 may receive the wireless signal including the second information/signal through the transceiver 106 and store the information obtained from the signal processing of the second information/signal in the memory 104. The memory 104 may be connected to the processor 102 and may store various information related to the operation of the processor 102. For example, the memory 104 is an instruction to perform some or all of the processes controlled by the processor 102, or to perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 102 and the memory 104 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 106 can be coupled to the processor 102 and can transmit and/or receive wireless signals through one or more antennas 108. The transceiver 106 may include a transmitter and/or receiver. The transceiver 106 may be mixed with a radio frequency (RF) unit. In the present disclosure, the wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202, one or more memories 204, and may further include one or more transceivers 206 and/or one or more antennas 208. The processor 202 controls the memory 204 and/or transceiver 206 and may be configured to implement the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. For example, the processor 202 may process information in the memory 204 to generate third information/signal, and then transmit a wireless signal including the third information/signal through the transceiver 206. Further, the processor 202 may receive the wireless signal including the fourth information/signal through the transceiver 206 and store the information obtained from the signal processing of the fourth information/signal in the memory 204. The memory 204 may be connected to the processor 202 and may store various information related to the operation of the processor 202. For example, the memory 204 is an instruction to perform some or all of the processes controlled by the processor 202, or to perform the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. You can store software code that includes Here, the processor 202 and the memory 204 may be part of a communication modem/circuit/chip designed to implement wireless communication technology (eg, LTE, NR). The transceiver 206 can be coupled to the processor 202 and can transmit and/or receive wireless signals through one or more antennas 208. Transceiver 206 may include a transmitter and/or receiver. Transceiver 206 may be mixed with an RF unit. In the present disclosure, the wireless device may mean a communication modem/circuit/chip.

Hereinafter, hardware elements of the

wireless devices

100 and 200 will be described in more detail. Without being limited to this, one or more protocol layers may be implemented by one or

more processors

102 and 202. For example, one or

more processors

102, 202 may implement one or more layers (eg, functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The one or

more processors

102 and 202 may include one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. Can be created. The one or

more processors

102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein. The one or

more processors

102, 202 generate signals (eg, baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and/or methods disclosed herein. , To one or

more transceivers

106, 206. One or

more processors

102, 202 may receive signals (eg, baseband signals) from one or

more transceivers

106, 206, and descriptions, functions, procedures, suggestions, methods and/or operational flow diagrams disclosed herein Depending on the field, PDU, SDU, message, control information, data or information may be acquired.

One or

more processors

102, 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or

more processors

102, 202 may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) May be included in one or

more processors

102, 202. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein can be implemented using firmware or software, and firmware or software can be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document include firmware or software configured to perform one or

more processors

102, 202 or stored in one or

more memories

104, 204. It can be driven by the above processors (102, 202). The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein may be implemented using firmware or software in the form of code, instructions and/or instructions.

One or

more memories

104, 204 may be coupled to one or

more processors

102, 202, and may store various types of data, signals, messages, information, programs, codes, instructions, and/or instructions. The one or

more memories

104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer readable storage media, and/or combinations thereof. The one or

more memories

104, 204 may be located inside and/or outside of the one or

more processors

102, 202. Also, the one or

more memories

104 and 204 may be connected to the one or

more processors

102 and 202 through various technologies such as a wired or wireless connection.

The one or

more transceivers

106 and 206 may transmit user data, control information, radio signals/channels, and the like referred to in the methods and/or operational flowcharts of the present document to one or more other devices. The one or

more transceivers

106, 206 may receive user data, control information, radio signals/channels, and the like referred to in the descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein from one or more other devices. have. For example, one or

more transceivers

106, 206 may be connected to one or

more processors

102, 202, and may transmit and receive wireless signals. For example, one or

more processors

102, 202 can control one or

more transceivers

106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Additionally, the one or

more processors

102, 202 can control one or

more transceivers

106, 206 to receive user data, control information, or wireless signals from one or more other devices. In addition, one or

more transceivers

106, 206 may be coupled to one or

more antennas

108, 208, and one or

more transceivers

106, 206 may be described, functions described herein through one or

more antennas

108, 208. , It may be set to transmit and receive user data, control information, radio signals/channels, etc. referred to in procedures, proposals, methods and/or operation flowcharts. In this document, the one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). The one or

more transceivers

106 and 206 use the received radio signal/channel and the like in the RF band signal to process the received user data, control information, radio signal/channel, and the like using one or

more processors

102 and 202. It can be converted to a baseband signal. The one or

more transceivers

106 and 206 may convert user data, control information, and radio signals/channels processed using one or

more processors

102 and 202 from a baseband signal to an RF band signal. To this end, the one or

more transceivers

106, 206 may include (analog) oscillators and/or filters.

5. 본 개시가 적용되는 무선 기기 활용 예5. Examples of using wireless devices to which the present disclosure applies

40 shows another example of a wireless device applied to the present disclosure. The wireless device may be implemented in various forms according to use-example/service (see FIG. 38).

Referring to FIG. 40, the

wireless devices

100 and 200 correspond to the

wireless devices

100 and 200 of FIG. 39, and various elements, components, units/units, and/or modules ). For example, the

wireless devices

100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and additional elements 140. The communication unit may include a communication circuit 112 and a transceiver(s) 114. For example, communication circuit 112 may include one or more processors 102,202 and/or one or more memories 104,204 of FIG. For example, the transceiver(s) 114 may include one or more transceivers 106,206 and/or one or more antennas 108,208 of FIG. 39. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional element 140, and controls various operations of the wireless device. For example, the controller 120 may control the electrical/mechanical operation of the wireless device based on the program/code/command/information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (eg, another communication device) through the wireless/wired interface through the communication unit 110 or external (eg, through the communication unit 110) Information received through a wireless/wired interface from another communication device) may be stored in the memory unit 130.

The additional element 140 may be variously configured according to the type of wireless device. For example, the additional element 140 may include at least one of a power unit/battery, an input/output unit (I/O unit), a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (FIGS. 38, 100A), vehicles (FIGS. 38, 100B-1, 100B-2), XR devices (FIGS. 38, 100C), portable devices (FIGS. 38, 100D), and household appliances. (Fig. 38, 100e), IoT device (Fig. 38, 100f), digital broadcasting terminal, hologram device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate/environment device, It may be implemented in the form of an AI server/device (FIGS. 38, 400), a base station (FIGS. 38, 200), a network node, or the like. The wireless device may be portable or may be used in a fixed place depending on use-example/service.

In FIG. 40, various elements, components, units/parts, and/or modules in the

wireless devices

100 and 200 may be connected to each other through a wired interface, or at least some of them may be connected wirelessly through the communication unit 110. For example, in the

wireless devices

100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (eg, 130 and 140) are connected through the communication unit 110. It can be connected wirelessly. Further, each element, component, unit/unit, and/or module in the

wireless devices

100 and 200 may further include one or more elements. For example, the controller 120 may be composed of one or more processor sets. For example, the control unit 120 may include a set of communication control processor, application processor, electronic control unit (ECU), graphic processing processor, and memory control processor. As another example, the memory unit 130 includes random access memory (RAM), dynamic RAM (DRAM), read only memory (ROM), flash memory, volatile memory, and non-volatile memory (non- volatile memory) and/or combinations thereof.

Hereinafter, the implementation example of FIG. 40 will be described in more detail with reference to the drawings.

5.1. 본 개시가 적용되는 휴대기기 예5.1. Examples of mobile devices to which the present disclosure applies

41 illustrates a portable device applied to the present disclosure. The portable device may include a smart phone, a smart pad, a wearable device (eg, a smart watch, smart glasses), and a portable computer (eg, a notebook, etc.). The mobile device may be referred to as a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), an advanced mobile station (AMS), or a wireless terminal (WT).

Referring to FIG. 41, the portable device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input/output unit 140c. ). The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 in FIG. 40, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The control unit 120 may perform various operations by controlling the components of the portable device 100. The controller 120 may include an application processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands necessary for driving the portable device 100. Also, the memory unit 130 may store input/output data/information. The power supply unit 140a supplies power to the mobile device 100 and may include a wired/wireless charging circuit, a battery, and the like. The interface unit 140b may support the connection between the mobile device 100 and other external devices. The interface unit 140b may include various ports (eg, audio input/output ports, video input/output ports) for connection with external devices. The input/output unit 140c may receive or output image information/signal, audio information/signal, data, and/or information input from a user. The input/output unit 140c may include a camera, a microphone, a user input unit, a display unit 140d, a speaker, and/or a haptic module.

For example, in the case of data communication, the input/output unit 140c acquires information/signal (eg, touch, text, voice, image, video) input from a user, and the obtained information/signal is transmitted to the memory unit 130 Can be saved. The communication unit 110 may convert information/signals stored in the memory into wireless signals, and transmit the converted wireless signals directly to other wireless devices or to a base station. In addition, after receiving a radio signal from another wireless device or a base station, the communication unit 110 may restore the received radio signal to original information/signal. After the restored information/signal is stored in the memory unit 130, it can be output in various forms (eg, text, voice, image, video, heptic) through the input/output unit 140c.

5.2. 본 개시가 적용되는 차량 또는 자율 주행 차량 예5.2. Examples of vehicles or autonomous vehicles to which the present disclosure applies

42 illustrates a vehicle or autonomous vehicle applied to the present disclosure. Vehicles or autonomous vehicles can be implemented as mobile robots, vehicles, trains, aerial vehicles (AVs), ships, and the like.

Referring to FIG. 42, the vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a driving unit 140a, a power supply unit 140b, a sensor unit 140c, and autonomous driving It may include a portion (140d). The antenna unit 108 may be configured as part of the communication unit 110. Blocks 110/130/140a-140d correspond to blocks 110/130/140 in FIG. 41, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, a base station (e.g. base station, road side unit, etc.) and a server. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The controller 120 may include an electronic control unit (ECU). The driving unit 140a may cause the vehicle or the autonomous vehicle 100 to travel on the ground. The driving unit 140a may include an engine, a motor, a power train, wheels, brakes, and steering devices. The power supply unit 140b supplies power to the vehicle or the autonomous vehicle 100 and may include a wire/wireless charging circuit, a battery, and the like. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, and the like. The sensor unit 140c includes an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, and a vehicle forward /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, and the like. The autonomous driving unit 140d maintains a driving lane, automatically adjusts speed, such as adaptive cruise control, and automatically moves along a predetermined route, and automatically sets a route when a destination is set. Technology, etc. can be implemented.

For example, the communication unit 110 may receive map data, traffic information data, and the like from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The controller 120 may control the driving unit 140a such that the vehicle or the autonomous vehicle 100 moves along the autonomous driving path according to a driving plan (eg, speed/direction adjustment). During autonomous driving, the communication unit 110 may acquire the latest traffic information data non-periodically from an external server, and acquire surrounding traffic information data from nearby vehicles. Also, during autonomous driving, the sensor unit 140c may acquire vehicle status and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and driving plan based on newly acquired data/information. The communication unit 110 may transmit information regarding a vehicle location, an autonomous driving route, and a driving plan to an external server. The external server may predict traffic information data in advance using AI technology or the like based on the information collected from the vehicle or autonomous vehicles, and provide the predicted traffic information data to the vehicle or autonomous vehicles.

The present disclosure may be embodied in other specific forms without departing from the technical ideas and essential features described in the present disclosure. Accordingly, the above detailed description should not be construed as limiting in all respects, but should be considered illustrative. The scope of the present disclosure should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the present disclosure are included in the scope of the present disclosure. In addition, in the claims, claims that do not have an explicit citation relationship may be combined to form an embodiment or may be included as a new claim by amendment after filing.

Embodiments of the present disclosure can be applied to various wireless access systems. Examples of various wireless access systems include 3GPP (3rd Generation Partnership Project) or 3GPP2 system. Embodiments of the present disclosure can be applied to not only the various wireless access systems, but also to all technical fields to which the various wireless access systems are applied. Furthermore, the proposed method can be applied to mmWave communication systems using ultra-high frequency bands.

Additionally, embodiments of the present disclosure can be applied to various applications such as free-driving vehicles, drones, and the like.

Claims

In the operation method of the terminal in the wireless communication system,

From the base station, downlink control information including (i) two transmission configuration indicators (TCI) states and (ii) information for one transport block (TB) ( receiving downlink control information (DCI);

Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) from the base station;

Based on the DCI and the configuration information, it is assumed that (i) data reception on the two PDSCHs is scheduled by the DCI, and (ii) data received on the two PDSCHs is based on the same information;

Based on the assumption, from one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first demodulation reference signal for a first PDSCH of the two PDSCHs DMRS) port information, and (ii) obtaining second MCS and second DMRS port information for a second PDSCH among the two PDSCHs; And

And acquiring data information through the two PDSCHs based on the obtained information.
According to claim 1,

The operation method of the terminal,

And receiving, from the base station, upper layer signaling that sets the maximum number of codewords scheduled by one DCI to one.
According to claim 1,

The second MCS, the first DMRS port information, the second DMRS port information is obtained from one field in the DCI, the operation method of the terminal.
According to claim 3,

The one field,

The antenna port field in the DCI, the operation method of the terminal.
According to claim 3,

The first DMRS port information and the second DMRS port information obtained from the one field are different based on the two PDSCHs received on the same resource.
The method of claim 5,

The first DMRS port information and the second DMRS port information are included in different CDM (Code Division Multiplexing) groups, the operation method of the terminal.
The method of claim 5,

The first DMRS port information and the second DMRS port information,

The method of operation of the terminal, which is jointly encoded and obtained from the one field.
The method of claim 7,

The second MCS,

Of the plurality of bits in the one field, the first DMRS port information and the second DMRS port information is obtained from one or more bits, not bits related to the operation method of the terminal.
According to claim 3,

The first DMRS port information and the second DMRS port information obtained from the one field are the same based on the two PDSCHs received on different resources.
According to claim 3,

The UE expects that the maximum number of layers to which the two PDSCHs are transmitted is set to 1, and the UE operates.
According to claim 1,

The two PDSCHs,

A method of operation of a terminal, each received from different transmission reception points (TRPs).
In the terminal operating in the wireless communication system,

At least one transmitter;

At least one receiver;

At least one processor; And

And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation,

The specific action is:

From the base station, downlink control information including (i) two transmission configuration indicators (TCI) states and (ii) information for one transport block (TB) ( receiving downlink control information (DCI);

Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) from the base station;

Based on the DCI and the configuration information, it is assumed that (i) data reception on the two PDSCHs is scheduled by the DCI, and (ii) data received on the two PDSCHs is based on the same information;

Based on the assumption, from one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first demodulation reference signal for a first PDSCH of the two PDSCHs DMRS) port information, and (ii) obtaining second MCS and second DMRS port information for a second PDSCH among the two PDSCHs; And

And acquiring data information through the two PDSCHs based on the obtained information.
The method of claim 12,

The terminal communicates with at least one of a mobile terminal, a network, and an autonomous vehicle other than the vehicle in which the terminal is included.
In a base station operating in a wireless communication system,

At least one transmitter;

At least one receiver;

At least one processor; And

And at least one memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a particular operation,

The specific action is:

As a terminal, (i) downlink control information including two transmission configuration indicators (TCI) states, and (ii) information for one transport block (TB) ( providing downlink control information (DCI);

Obtaining configuration information related to a first mode in which data based on the same information is transmitted through the two physical downlink shared channels (PDSCHs) to the terminal; And

And transmitting data information to the terminal through the two PDSCHs based on the DCI and the configuration information.

Data reception on the two PDSCHs is scheduled by the DCI,

Data received through the two PDSCHs is based on the same information,

Based on one or more fields in the DCI, (i) a first modulation and coding scheme (MCS) and a first demodulation reference signal (DMRS) port for a first PDSCH among the two PDSCHs Information, and (ii) second MCS and second DMRS port information for a second PDSCH among the two PDSCHs are determined.