WO2020122581A1

WO2020122581A1 - Method for operating user equipment and base station in wireless communication system, and device for supporting same

Info

Publication number: WO2020122581A1
Application number: PCT/KR2019/017455
Authority: WO
Inventors: 이길봄; 김규석; 김기준; 강지원
Original assignee: 엘지전자 주식회사
Priority date: 2018-12-11
Filing date: 2019-12-11
Publication date: 2020-06-18

Abstract

Disclosed are a method for operating a user equipment and a base station in a wireless communication system, and a device for supporting the method. According to an applicable embodiment in the present disclosure, a user equipment can establish a connection with a base station on the basis of a synchronization signal/physical broadcast channel (SS/PBCH) block received from the base station. Therefore, the user equipment is set in a transmission mode in which data generated from the same information is transmitted from a plurality of transmission reception points (TRPs) by means of the base station and can acquire data information from at least one TRP from among the plurality of TRPs on the basis of the transmission mode.

Description

Method of operating terminal and base station in wireless communication system and apparatus supporting same

The following description relates to a wireless communication system, in which a terminal performs initial access to a base station in a wireless communication system, and acquires data information from at least one TRP among a plurality of transmission reception points (TRPs) included in the base station. It relates to an operation method of a terminal and a base station related to the operation and a device supporting the operation.

Wireless access systems have been widely deployed to provide various types of communication services such as voice and data. In general, 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 various services anytime, anywhere by connecting multiple devices and objects has been proposed. Accordingly, advanced 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.

In the present disclosure, an operation method of a terminal and a base station in a wireless communication system and devices supporting the same are provided.

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 one example of the present disclosure, in a method of operating a terminal in a wireless communication system, a synchronization signal / physical broadcast channel (SS/) including a synchronization signal (SS) and a physical broadcast channel (PBCH) from a base station PBCH) block; Based on the received SS/PBCH block, performs an access procedure to the base station including random access channel (RACH) preamble transmission; Receiving downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from the base station; Obtaining mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station; 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, and (ii) the plurality of TRPs Assume that data received from is based on the same information; And acquiring data information from at least one TRP among the plurality of TRPs based on the assumption.

In the present disclosure, the DCI may include information for two transmission blocks (TBs) corresponding to each of the two codewords.

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

In the present disclosure, the mode information may be received through higher layer signaling including radio resource control (RRC) signaling.

In the present disclosure, the mode information 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 the present disclosure, (i) based on the DCI indicating that two codewords are activated and (ii) the assumption, the terminal shares each physical downlink associated with two TRPs among the plurality of TRPs. The data information may be obtained through a physical downlink shared channel (PDSCH) opportunity.

For example, the redundancy version (RV) information for the two PDSCH opportunities is determined based on the RV information associated with the 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}.

In the present disclosure, (i) based on the DCI and the assumption indicating that one codeword of two codewords is activated, the terminal is a physical downlink shared channel associated with one of the plurality of TRPs (physical downlink shared channel; PDSCH) may obtain the data information through the opportunity.

Here, the PDSCH opportunity may be related to one TCI state determined based on the DCI among the plurality of TCI states.

In the present disclosure, the first mode may include a multiple TRP-based ultra-reliable low latency communication (URLLLC) mode.

In the present disclosure, the mode information may be related to one of the first mode or a second mode including multiple TRP-based enhanced mobile broadband (eMBB) mode.

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. Receiving a synchronization signal/physical broadcast channel (SS/PBCH) block including a sync signal (SS) and a physical broadcast channel (PBCH); Based on the received SS/PBCH block, performs an access procedure to the base station including random access channel (RACH) preamble transmission; Receiving downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from the base station; Obtaining mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station; 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, and (ii) the plurality of TRPs Assume that data received from is based on the same information; And obtaining data information from at least one TRP among the plurality of TRPs based on the assumption.

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. Transmitting a synchronization signal/physical broadcast channel (SS/PBCH) block including a sync signal (SS) and a physical broadcast channel (PBCH); Performing a connection establishment procedure with the terminal based on the transmitted SS/PBCH block; Transmitting downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states to the terminal; Providing mode information related to a first mode in which a plurality of data based on the same information is transmitted to the terminal; And transmitting data information through at least one TRP of a plurality of transmission reception points (TRPs), scheduled by the DCI, based on the DCI and the mode information. Data transmitted via TRPs initiates a base station, based on the same information.

The above-described aspects of the present disclosure are only some of the 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 may set/instruct a transmission mode for transmitting PDSCHs (or PDSCH occasions) generated from the same data information through a plurality of TRPs, and correspondingly, the terminal based on the transmission mode PDSCHs may be received from the plurality of TRPs to obtain data information.

Alternatively, based on the transmission mode, the base station may transmit the data information to the terminal through at least one TRP of the plurality of TRPs. In response to this, the terminal in which the transmission mode is set may acquire the data information from the base station through at least one TRP among the plurality of TRPs.

The effects obtainable in the embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned are technical fields to which the technical configuration of the present disclosure is applied 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 can 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 drawing refer to structural elements.

1 illustrates a communication system applied to the present disclosure.

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

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

4 illustrates a portable device applied to the disclosure.

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

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

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

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

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

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

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

12 is a diagram illustrating an example of a case in which time and/or frequency resources of two PDSCHs applicable to the present disclosure overlap.

13 is a diagram briefly showing a single PDCCH system operation applicable to the present disclosure.

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

15 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).

16 is a diagram briefly showing a network access and communication process between a terminal and a base station applicable to the present disclosure.

17 is a diagram briefly showing operations of a terminal and a base station according to an example of the present disclosure, FIG. 18 is a flowchart of operation of a terminal according to an example of the present disclosure, and FIG. 19 is an operation of a base station according to an example of the present disclosure It is a flow chart.

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 stated otherwise. Each component or feature may be implemented in a form that is not combined with other components or features. In addition, some components and/or features may be combined to form an embodiment of the present disclosure. 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, this 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 terms in the context of describing the present disclosure (especially in the context of the following claims) are 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 be.

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

Further, the transmitting end refers to a fixed and/or mobile node that provides a data service or voice service, and the receiving end refers to a fixed and/or mobile node that receives a data service or 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 wireless access systems, IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) 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, in conjunction 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 configurations 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 embodiment proposed in the present disclosure can be applied to other wireless systems (eg, 3GPP LTE, IEEE 802.16, IEEE 802.11, etc.).

1. 본 개시가 적용되는 통신 시스템 예1. 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.

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

Referring to FIG. 1, 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 radio 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. ), Internet of Thing (IoT) devices 100f, and AI devices/servers 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, and a washing machine. 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, the vehicles 100b-1 and 100b-2 may communicate directly (e.g. Vehicle to Vehicle (V2V)/Vehicle to everything (V2X) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensor) 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 and base stations/wireless devices, base stations and base stations can transmit/receive radio signals to each other through wireless communication/

connections

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

connections

150a, 150b, 150c can 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.

2. 본 개시가 적용되는 무선 기기 예2. Examples of wireless devices to which the present disclosure applies

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

Referring to FIG. 2, 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. 1 }.

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. In addition, 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 can 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. Descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software, and firmware or software may be implemented to include modules, procedures, functions, and the like. The descriptions, functions, procedures, suggestions, methods and/or operational flowcharts disclosed herein are either firmware or software set to perform or are stored in 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 can be implemented using firmware or software in the form of code, instructions and/or instructions.

The 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 this 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 may control one or

more transceivers

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

more processors

102, 202 may 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. , May be set to transmit and receive user data, control information, radio signals/channels, and the like referred to in procedures, proposals, methods, and/or operational 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.

3. 본 개시가 적용되는 무선 기기 활용 예3. Examples of using wireless devices to which the present disclosure applies

3 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. 1).

Referring to FIG. 3, the

wireless devices

100 and 200 correspond to the

wireless devices

100 and 200 of FIG. 2, 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 and 202 of FIG. 2 and/or one or

more memories

104 and 204. For example, the transceiver(s) 114 may include one or more transceivers 106,206 and/or one or more antennas 108,208 of FIG. 2. 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 externally (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. 1, 100A), vehicles (FIGS. 1, 100B-1, 100B-2), XR devices (FIGS. 1, 100C), portable devices (FIGS. 1, 100D), and household appliances. (Fig. 1, 100e), IoT device (Fig. 1, 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. 1 and 400), a base station (FIGS. 1 and 200), and a network node. The wireless device may be mobile or may be used in a fixed place depending on use-example/service.

In FIG. 3, 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. In 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. 3 will be described in more detail with reference to the drawings.

3.1. 본 개시가 적용되는 휴대기기 예3.1. Examples of mobile devices to which the present disclosure applies

4 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. 4, the mobile 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. 3, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with other wireless devices and base stations. The controller 120 may perform various operations by controlling the components of the mobile 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 portable 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 the 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.

3.2. 본 개시가 적용되는 차량 또는 자율 주행 차량 예3.2. Examples of vehicles or autonomous vehicles to which the present disclosure applies

5 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. 5, 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 through 140d correspond to blocks 110/130/140 in FIG. 4, respectively.

The communication unit 110 may transmit and receive signals (eg, data, control signals, etc.) with external devices such as other vehicles, base stations (e.g. base stations, road side units, etc.) and servers. 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 wired/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 IMU (inertial measurement unit) 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 travels 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 control unit 120 may control the driving unit 140a so 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 from an external server non-periodically and may 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.

4. NR 시스템4. NR system

4.1. 물리 채널들 및 일반적인 신호 전송4.1. 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.

6 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 then a little more. Specific system information can be obtained.

Then, the terminal may perform a random access procedure (Random Access Procedure) as in steps S13 to S16 afterwards 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. The Uplink Shared Channel (PUCCH) signal and/or the Physical Uplink Control Channel (PUCCH) signal may be transmitted (S18).

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.

4.2. 무선 프레임 (Radio Frame) 구조4.2. Radio frame structure

Uplink and downlink transmission based on the NR system is based on a frame as shown in FIG. 7. 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, when 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 into 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 a time unit (TU)) 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 may 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. 9, a hatched area (eg, symbol index = 0) represents a downlink control area, and a black area (eg, symbol index = 13) represents 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 of the final data transmission.

In this self-supporting slot structure, a type gap of a certain length of time 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 only the DL control region or the UL control region is included as well as the case where both the DL control region and the UL control region are included as shown in FIG. 9.

In addition, 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.

The PDCCH may be transmitted in the DL control region, and the 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 PDCCH, downlink control information (DCI), for example, DL data scheduling information, UL data scheduling information, and the like may be transmitted. In 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 QPSK (Quadrature Phase Shift Keying), 16 QAM (Quadrature Amplitude Modulation), 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. 10, D represents a resource element (RE) to which DCI is mapped, and R represents a 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.). A plurality of CORESETs for one UE may overlap in the time/frequency domain. CORESET may be set through system information (eg, MIB) or UE-specific higher 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 UE transmits one sequence among a plurality of sequences through PUCCH in PUCCH format 0 to transmit a specific UCI to the base station. The UE transmits a PUCCH in PUCCH format 0 in PUCCH resource for setting a corresponding SR only when transmitting a positive SR.

PUCCH format 1 carries UCI up to 2 bits in size, and modulation symbols are spread in an orthogonal cover code (OCC) in the time domain (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 of 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).

4.3. DCI 포맷4.3. DCI format

In the NR system to which the present disclosure is applicable, the following DCI formats may be supported. First, the NR system may support 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 that can be used for other purposes, the NR system can 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 for scheduling TB (Transmission Block) based (or TB-level) PUSCH, DCI format 0_1 is TB (Transmission Block) 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 to indicate the slot format (slot format) (used for notifying the slot format), DCI format 2_1 is used to inform 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/disable the transport block 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.

4.4. CORESET (Control resource set)4.4. 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 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.

4.5. 안테나 포트 의사 코-로케이션 (antenna ports quasi co-location)4.5. 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 UE) can decode the PDSCH according to 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 of 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 receives the initial higher layer configuration of the TCI states (initial higher layer configuration) and before the terminal receives the activation command, the terminal has the DMRS port(s) of the PDSCH of the serving cell is'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 exists in the PDCCH of DCI format 1_1 transmitted on the CORESET. For CORESET scheduling the PDSCH, the upper layer parameter tci-PresentInDCI is not set 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. If 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 performs 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 a 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 an 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 the 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 where the upper layer parameter trs-Info is set, the 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 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,

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

For DMRS of the PDCCH, the UE 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 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 may 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). Can be. 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 before the TRS is set (by default). 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.

4.6. CSI-RS (channel state information reference signal)4.6. CSI-RS (channel state information reference signal)

In the mobile communication system according to the present disclosure, a method capable of improving transmit/receive data efficiency by employing multiple transmit antennas and multiple receive antennas for packet transmission is used. When data is transmitted and received using multiple input/output antennas, a channel condition between a transmitting antenna and a receiving antenna must be detected in order 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,

4.7. DMRS (Demodulation Reference Signal)4.7. DMRS (Demodulation Reference Signal)

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

Front loaded DMRS can support fast decoding. The first OFDM symbol carried on 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 allocated to 0 to 2 OFDM symbols.

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

In the present disclosure, two DMRS configuration types may be applied. Of the two DMRS configuration types, a DMRS configuration type that is substantially set for a 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 (for example, 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 front loaded DMRS number of OFDM symbols allocated = 2

Up to eight 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 presence 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 presence 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. 11(a) shows a structure in which DMRS is first loaded on one symbol (front loaded DMRS with one symbol), and FIG. 11(b) is a structure in which DMRS is first loaded on two symbols (front loaded) DMRS with two symbols).

In FIG. 11, Δ denotes a DMRS offset value in the frequency axis. At this time, DMRS ports having the same △ may be code division multiplexing in frequency domain (CDM-F) in the frequency domain or code division multiplexing in time domain (CDM-T) in the time domain. . 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 of 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 the first DMRS configuration type for the PDSCH, and Table 13 shows parameters for the second DMRS configuration type for the PDSCH.

The terminal may acquire 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 on 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,

4.8. 코드워드 (codeword)4.8. 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. For 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 .

Accordingly, 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, the UE may assume that the corresponding fields are padded with zero in interpreting the MCS, NDI, and RV fields of transport block 2 have. Subsequently, in the above 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).

4.9. 본 개시에 적용 가능한 시간/주파수 자원 할당 케이스4.9. 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 in which T/F resources overlap may include all five cases illustrated in FIG. 12.

As shown in FIG. 12, the 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. 12, it is shown that two PDSCHs overlap (partially) in both time and frequency. In Case #4 of FIG. 12, it is shown that two PDSCHs do not overlap only on the time axis. In Case #5 of FIG. 12, two PDSCHs overlap in the time axis, but not overlap in the frequency axis.

4.10. 단일 PDCCH (Single PDCCH) 시스템4.10. Single PDCCH (Single PDCCH) system

In FIG. 13, it is assumed that two TRP#1/#2 transmit PDSCH#1/#2 to one UE, respectively. In the following description, as illustrated in FIG. 13, 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 a user equipment receives PDSCHs from different TRPs, the user equipment 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 each transmit a PDCCH 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. 13, the PDCCH for scheduling PDSCH #1/#2 may be transmitted from TRP #1 and/or TRP #2 to the UE.

4.11. Non-Coherent Joint Transmission (NC-JT)4.11. Non-Coherent Joint Transmission (NC-JT)

In this document, time resources of PDSCHs transmitted by different TRP (or beams) are overlapped (partially) or (partially CASE#5 in FIG. 12) or time and frequency resources are overlapped (partially) (eg: In the case of CASE#1, #2, #3) of FIG. 12, a 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 respectively transmitted from the different TRPs (or beams) are scheduled by one DCI. Can be. 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, multi 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 be. 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 the layers transmitted by different TRPs are independent or common.

In this document,'layer independent' means that when TRP#A transmits a signal through 3 layers and TRP#B transmits a signal through 4 layers, the terminal transmits 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 3 layers and TRP#B transmits a signal through 3 layers, a total of 3 terminals are used. It may mean expecting signal reception through a 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.

4.12. HARQ 프로세스4.12. 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 PDSCH scheduled by the DCI is a retransmission for the PDSCHs previously transmitted.

4.13. 변조 차수 (modulation order) 및 타겟 코드 레이트 (target code rate) 결정4.13. 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 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 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 the UE is 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) MCS-C-RNTI is set to the terminal, (ii) PDSCH is scheduled by the PDCCH CRC scrambled by 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 DCI format 1_1) CRC scrambled by CS-RNTI, or

-When the PDSCH is scheduled using SPS-config without transmitting the corresponding 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.

(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.

5. 본 문서에서 개시하는 단말 및 기지국의 동작 예5. Examples of operation of terminals and base stations disclosed in this document

5.0. 정의5.0. 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, TRP (Transmission Reception Point) may be applied to the beam (beam).

In the present disclosure,'PDSCH repetition (repetition)' means that (i) a plurality of TRP/beam(s) simultaneously transmit 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. 12). In addition,'PDSCH repetition (repetition)' means (iv) a plurality of TRP/beam(s) transmits PDSCH on OFDM symbols 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. 12).

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 index CW#0, #1, (i) NDI, MCS, RV of CW#0 in DCI indicates NDI, MCS, 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.

Alternatively, 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) means that the base station indicates two different TCI states each having one RS set to the terminal.

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 the case of uplink signal transmission as well as the case of downlink 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.

5.1. 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)5.1. 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. 14, 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. 14, two TRPs may transmit corresponding signals through the same T/F resource (eg, overlapped PRGs), or may transmit corresponding signals through T/F resources disjoint with each other (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 may increase. 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 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. 14, 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. 14.

-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 information. .

-Interleaved PRGs: Each of the two TRPs can transmit the 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: The two TRPs can 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.

5.1.1. PDSCH 반복 전송 모드의 설정 방법 (Method on configuration of PDSCH repetition)5.1.1. Method for configuring PDSCH repetition transmission mode (Method on configuration of PDSCH repetition)

5.1.1.1. Method for setting the first PDSCH repeat transmission mode

The base station provides 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 higher 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'.

5.1.1.2. 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 UE (i) sets/instructs the TCI state including two RS sets or (ii) sets/instructs two TCI states each including one RS set

-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.

5.1.2. PDSCH 반복 전송 모드의 활성화/비활성화를 동적으로 설정하는 방법 (Method on enabling/disabling PDSCH-rep-mode dynamically)5.1.2. How to dynamically enable/disable PDSCH repetitive transmission mode (Method on enabling/disabling PDSCH-rep-mode dynamically)

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

The UE configured with PDSCH-rep-mode is based on the determination that two CWs are enabled by the DCI received from the base station, and the two CWs generated from the same information sequence are different from each other in 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.

As an 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.

5.1.2.2. 2nd PDSCH repeat transmission mode activation/deactivation setting method

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

5.1.3. 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)5.1.3. Method on configuring the relationship between two CWs and respectively two RS sets dynamically

5.1.3.1. 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).

5.1.3.2. 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 be. At this time, a valid RS set is determined based on (i) an activated TB, or (ii) a DCI field corresponding to an inactivated 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 5.1.2. 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.

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 the 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 terminal 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 UE 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 the 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 the base station can set for the terminal 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.

5.1.3.3. 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, when 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 terminal may not expect that a DL signal can be transmitted in RS set#1.

5.1.4. 두 CW들의 RV 필드간 관계를 설정하는 방법 (Method on configuring association between RV of CW#0 and RV of CW#1)5.1.4. Method of configuring association between RV of CW#0 and RV of CW#1

5.1.4.1. Method for establishing relationship between RV fields of first two CWs

A 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: Two CWs directed/assigned by one DCI are self-decodable RVs (eg RV #0, #3) and non-self-decodables ) Maps to 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, if 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 23 below.

For example, in Table 23, 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 23 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 UEs within a certain time period, reception of a self-decodable CW can be guaranteed 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 can 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 23, 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 of 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, 0/1 is indicated/set) may be indicated/set to the UE through one or more of the MCS fields for the second TB.

In addition, as described above, the RV value of CW#1 is determined based on the RRC parameter and the RV value of CW#0, or the paring index is based on DCI and/or RRC as shown in Table 24 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.

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

The 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 UE 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. As an 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.

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).

First, the UE can be set PDSCH-rep-mode by the base station. Previously, 5.1.1. 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) to the UE, 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 be.

Or, if 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 5.1.2 to 5.1.4 described above, the UE transmits PDSCH #1 (or CW #0 or from 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 5.1.2 to 5.1.4 may be applied.

In this document, an operation in which two different TRPs transmit CWs 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 respective terminals may correspond to operations for the 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 utilized.

At this time, when the base station supports the eMBB service, each TB fields in 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, when 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. 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) are 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 multiple 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 may 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 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 opportunity(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.

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

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

(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, a 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 perform a network access process to perform the above-described/suggested procedures and/or methods. For example, the terminal may receive and store system information and configuration information necessary to perform the above-described/suggested procedures and/or methods while accessing a network (eg, a base station) and store it in a memory. Configuration information necessary for the present disclosure may be received through higher layer (eg, RRC layer; Medium Access Control, MAC, layer, etc.) signaling.

In the NR system, a physical channel and a reference signal can be transmitted using beam-forming. When beam-forming-based signal transmission is supported, a beam management process may be performed to align beams between a base station and a terminal. Also, the signal proposed in the present disclosure may be transmitted/received using beam-forming. In the radio resource control (RRC) IDLE mode, beam alignment may be performed based on a sync signal block (SSB). On the other hand, beam alignment in RRC CONNECTED mode may be performed based on CSI-RS (in DL) and SRS (in UL). On the other hand, when beam-forming-based signal transmission is not supported, a beam-related operation may be omitted in the following description.

Referring to FIG. 16, a base station (eg, BS) may periodically transmit an SSB (S1602). Here, the SSB includes PSS/SSS/PBCH. The SSB can be transmitted using beam sweeping. Thereafter, the base station may transmit Remaining Minimum System Information (RMSI) and Other System Information (OSI) (S1604). The RMSI may include information (eg, PRACH configuration information) necessary for the UE to initially access the base station. Meanwhile, the terminal performs SSB detection and then identifies the best SSB. Thereafter, the terminal may transmit the RACH preamble (Message 1, Msg1) to the base station using the PRACH resource linked/corresponding to the index (ie, beam) of the best SSB (S1606). The beam direction of the RACH preamble is associated with PRACH resources. Association between PRACH resources (and/or RACH preamble) and SSB (index) may be established through system information (eg, RMSI). Subsequently, as part of the RACH process, the base station transmits a random access response (RAR) (Msg2) in response to the RACH preamble (S1608), and the terminal uses Msg3 (eg, RRC Connection Request) using the UL grant in the RAR. Transmit (S1610), the base station may transmit a contention resolution (contention resolution) message (Msg4) (S1612). Msg4 may include RRC Connection Setup.

When an RRC connection is established between the base station and the UE through the RACH process, subsequent beam alignment may be performed based on SSB/CSI-RS (in DL) and SRS (in UL). For example, the terminal may receive SSB/CSI-RS (S1614). SSB/CSI-RS may be used by the UE to generate a beam/CSI report. Meanwhile, the base station may request the beam/CSI report to the UE through DCI (S1616). In this case, the UE may generate a beam/CSI report based on the SSB/CSI-RS, and transmit the generated beam/CSI report to the base station through PUSCH/PUCCH (S1618). The beam/CSI report may include beam measurement results, information on a preferred beam, and the like. The base station and the terminal can switch the beam based on the beam/CSI report (S1620a, S1620b).

Thereafter, the terminal and the base station may perform the procedures and/or methods described/proposed above. For example, the terminal and the base station process the information in the memory according to the proposal in the present disclosure based on the configuration information obtained in the network access process (eg, system information acquisition process, RRC connection process through RACH, etc.), and then wireless signal Or transmit the received wireless signal and store it in memory. Here, the radio signal may include at least one of PDCCH, PDSCH, and RS (Reference Signal) for downlink, and at least one of PUCCH, PUSCH, and SRS for uplink.

In one example applicable to the present disclosure, the terminal receives a synchronization signal / physical broadcast channel (SS/PBCH) block including a synchronization signal (SS) and a physical broadcast channel (PBCH) from a base station. It can be (S1710, S1810). In response to this, the base station may transmit an SS/PBCH block to the terminal (S1710, S1910).

Based on the received SS/PBCH block, the UE may perform an access procedure to the base station including a random access channel (RACH) preamble transmission (S1720, S1820). In response to this, the base station may also establish a connection with the terminal (S1720, S1920).

And, the terminal and the base station that the connection is established based on the above procedure can operate as follows.

More specifically, the UE may receive downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from a base station (S1730, S1830). In response to this, the base station may transmit the DCI to the terminal (S1730, S1930).

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.

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 a multi-TRP-based enhanced mobile broadband (eMBB) mode.

As an example applicable to the present disclosure, the UE may receive the mode information through higher layer signaling including radio resource control (RRC) signaling (S1740, S1840). In response to this, the base station may transmit the mode information to the terminal through higher layer signaling (S1740, S1940). 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 DCI including a cyclic scrambled CRC (Cyclic Redundancy Check) 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 UE, 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 S is based on the same information (S1750, S1850).

Subsequently, the terminal may acquire data information from at least one TRP among the plurality of TRPs based on the assumption (S1760, S1860). 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. (S1760, S1850).

As a specific example, (i) the DCI indicating that two codewords are activated, and (ii) based on 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 related to a first codeword included in the DCI, (i) 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 specific example, (i) based on the DCI and the assumption indicating that one codeword of two codewords is activated, the terminal performs a physical downlink shared channel related to 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.

It is obvious 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 merge) form of some suggested schemes. Whether the application of the proposed methods 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, physical layer signal or higher layer signal). have.

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, claims that do not have an explicit citation relationship in the claims may be combined to form an embodiment or be included as a new claim by amendment after filing.

Embodiments of the present disclosure can be applied to various wireless access systems. As an example of various wireless access systems, there are 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 also be applied to mmWave communication systems using ultra-high frequency bands.

Additionally, embodiments of the present disclosure can also 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,

Receiving a synchronization signal/physical broadcast channel (SS/PBCH) block including a sync signal (SS) and a physical broadcast channel (PBCH) from a base station;

Based on the received SS/PBCH block, performs an access procedure to the base station including random access channel (RACH) preamble transmission;

Receiving downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from the base station;

Obtaining mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station;

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, and (ii) the plurality of TRPs Assume that data received from is based on the same information; And

Based on the assumption, including obtaining data information from at least one TRP of the plurality of TRP, the operation method of the terminal.
According to claim 1,

The DCI includes information for two transmission blocks (TBs) corresponding to each of the two codewords.
According to claim 1,

Each of the plurality of TCI states is associated with one set of reference signals (RS), the method of operation of the terminal.
According to claim 1,

The mode information is received through higher layer signaling including radio resource control (RRC) signaling.
According to claim 1,

The mode information is obtained based on a DCI including a CRC (Cyclic Redundancy Check) scrambled with a radio network temporary identifier (RNTI) associated with the first mode.
According to claim 1,

(i) based on the DCI indicating that two codewords are activated and (ii) the assumption, the terminal is associated with each physical downlink shared channel associated with two TRPs among the plurality of TRPs (physical downlink shared) channel (PDSCH) to obtain the data information through an opportunity (occasion), the operation method of the terminal.
The method of claim 6,

The redundancy version (RV) information for the two PDSCH opportunities is:

(i) RV combination for the two PDSCH opportunities is determined based on RV information related to a first codeword included in the DCI, 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,

It is determined based on any one of the method of operation of the terminal.
The method of claim 6,

The redundancy version (RV) information for the two PDSCH opportunities is:

One of {RV#0, RV#2}, {RV#1, RV#3}, {RV#2, RV#0}, and {RV#3, RV#1}.
According to claim 1,

(i) Based on the DCI and the assumption indicating that one codeword of two codewords is activated, the terminal is a physical downlink shared channel associated with one of the plurality of TRPs (physical downlink shared channel) PDSCH) How to obtain the data information through an opportunity (occasion), the operation method of the terminal.
The method of claim 9,

The PDSCH opportunity is associated with one TCI state determined based on the DCI among the plurality of TCI states, the method of operation of the terminal.
According to claim 1,

The first mode,

A method of operating a terminal, including multiple TRP-based URLLLC (ultra-reliable low latency communication) mode.
According to claim 1,

The mode information,

A method of operating a terminal associated with one of the first mode or a second mode including multiple TRP-based enhanced mobile broadband (eMBB) mode.
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:

Receiving a synchronization signal/physical broadcast channel (SS/PBCH) block including a sync signal (SS) and a physical broadcast channel (PBCH) from a base station;

Based on the received SS/PBCH block, performs an access procedure to the base station including random access channel (RACH) preamble transmission;

Receiving downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states from the base station;

Obtaining mode information related to a first mode in which a plurality of data based on the same information is transmitted from the base station;

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, and (ii) the plurality of TRPs Assume that data received from is based on the same information; And

Based on the assumption, comprising obtaining data information from at least one or more TRP of the plurality of TRP, the terminal.
The method of claim 13,

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:

Transmitting a synchronization signal / physical broadcast channel (SS/PBCH) block including a synchronization signal (SS) and a physical broadcast channel (PBCH) to the terminal;

Performing a connection establishment procedure with the terminal based on the transmitted SS/PBCH block;

Transmitting downlink control information (DCI) including a plurality of transmission configuration indicator (TCI) states to the terminal;

Providing mode information related to a first mode in which a plurality of data based on the same information is transmitted to the terminal; And

And transmitting data information through at least one TRP of a plurality of transmission reception points (TRPs), scheduled by the DCI, based on the DCI and the mode information.

The data transmitted through the plurality of TRPs is based on the same information, a base station.