WO2020204326A1

WO2020204326A1 - Method for reporting channel state information by terminal on basis of active bandwidth part in wireless communication system, and terminal and base station supporting same

Info

Publication number: WO2020204326A1
Application number: PCT/KR2020/001116
Authority: WO
Inventors: 이길봄; 강지원
Original assignee: 엘지전자 주식회사
Priority date: 2019-03-29
Filing date: 2020-01-22
Publication date: 2020-10-08

Abstract

The present disclosure discloses a method for reporting channel state information by a terminal, which is related to beam management (BM), and a terminal and a base station supporting same. According to an embodiment applicable to the present disclosure, a terminal may receive (i) information on an active uplink bandwidth part (BWP) and (ii) information on a physical uplink shared channel, which are related to channel state information, from a base station, and may report, to the base station, the channel state information including beam quality information determined based on a configuration of the base station, via the physical uplink shared channel within the active uplink BWP. In response thereto, the base station may control one or more beams that provide a service to the terminal, by using the reported channel state information.

Description

Method for reporting channel state information of a terminal based on an active bandwidth part in a wireless communication system, and a terminal and a base station supporting the same

The following description is for a wireless communication system, based on beam management-related configuration information and active bandwidth part information received from a base station, a method for a terminal to report channel state information including beam quality information, and support thereof It is for the terminal and the base station.

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 multiple access systems 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) system. division multiple access) system.

In particular, as more communication devices require a larger communication capacity, an improved mobile broadband communication technology compared to the existing radio access technology (RAT) has been proposed. In addition, a communication system considering a service/UE sensitive to reliability and latency as well as Massive MTC (Machine Type Communications) that provides various services anytime, anywhere by connecting a plurality of devices and objects has been proposed. Accordingly, improved mobile broadband communication, massive MTC, and URLLC (Ultra-Reliable and Low Latency Communication) have been introduced, and various technical configurations for this have been proposed.

The present disclosure provides a method of reporting channel state information of a terminal in a wireless communication system, and a terminal and a base station supporting the same.

The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical problems that are 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.

As an example of the present disclosure, in a method for a terminal to report channel state information (CSI) in a wireless communication system, receiving configuration information related to beam management (BM) from a base station, the The configuration information is first report configuration information configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality, or (i) the first beam having the highest beam quality and A second set to report related first beam quality information and (ii) second beam quality information related to a second beam having the same channel measurement resource (CMR) as the first beam and having the lowest beam quality Report setting information, including at least one or more of; (I) an active uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) scheduling control information is received from the base station; And reporting the channel state information including beam quality information determined from a received reference signal to the base station through the scheduled PUSCH in the active uplink BWP based on the configuration information and the control information. Disclosed is a method of reporting channel state information of

In the present disclosure, the configuration information may be received through at least one or more of higher layer signaling or downlink control information (DCI).

In the present disclosure, the beam quality information includes reference signal received power (RSRP) information associated with each beam, or a signal to interference plus noise ratio associated with each of the reported beams. ratio; SINR) may include at least one or more of information.

At this time, based on the report content setting information included in the setting information, the beam quality information may include at least one of RSRP information related to each of the reporting beams or SINR information related to each of the reporting beams. .

In the present disclosure, the configuration information may include CMR information related to each beam, and interference measurement resource (IMR) information related to each beam.

In the present disclosure, based on the setting information including (i) information on the number of reference signals reported by the terminal set to N and (ii) the first report setting information, the channel state information is, (i) the First beam quality information, and (ii) third beam quality information related to N-1 third beams having higher beam quality after the first beam, and N may be a natural number of 2 or more.

In the present disclosure, based on the setting information including (i) information on the number of reference signals reported by the terminal set to 3, (ii) the first report setting information and (iii) the second report setting information, The channel state information includes (i) the first beam quality information, (ii) the second beam quality information related to the second beam having the same CMR as the first beam and having the lowest beam quality, and (iii) It may include third beam quality information related to the third beam having the highest beam quality after the first beam.

In the present disclosure, based on the beam quality information including signal to interference plus noise ratio (SINR) information related to each reported beam, SINR information related to each reported beam is the It may be calculated based on the interference power determined by averaging the power of one or more ports for interference measurement resources (IMR) related to each reported beam.

In the present disclosure, based on the beam quality information including signal to interference plus noise ratio (SINR) information related to each reported beam, CMR and interference measurement resources related to a specific beam (interference measurement resource; IMR) has the same identification information or if the IMR related to the specific beam is not set, the SINR information related to the specific beam will be calculated based on the interference power determined based on the CMR related to the specific beam. I can.

In the present disclosure, (i) the beam quality information including signal to interference plus noise ratio (SINR) information associated with each of the reported beams, and (ii) one or more Based on the CMR related to the interference measurement resource (IMR), the SINR information related to the specific beam is calculated based on the interference power determined by averaging the interference power from the at least one IMR related to the CMR. Can be.

In the present disclosure, based on the beam quality information including signal to interference plus noise ratio (SINR) information related to each reported beam, the channel state information is It may further include related CMR information and interference measurement resource (IMR) information.

In the present disclosure, the reference signal is a channel state information reference signal (CSI-RS), or a synchronization signal physical broadcast channel block (SS/PBCH block or SSB) It may include at least one or more of.

As another example of the present disclosure, in a terminal reporting channel state information (CSI) in a wireless communication system, at least one transmitter; At least one receiver; At least one processor; And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed, wherein the specific operation is: from a base station , Receiving configuration information related to beam management (BM), wherein the configuration information is a first report configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality Configuration information, or (i) first beam quality information related to the first beam having the highest beam quality, and (ii) the same channel measurement resource (CMR) as the first beam, and the beam quality is the most Including at least one of second report configuration information configured to report second beam quality information related to the low second beam; (I) an active uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) scheduling control information is received from the base station; And reporting the channel state information including beam quality information determined from a received reference signal to the base station through the scheduled PUSCH in the active uplink BWP based on the configuration information and the control information. Start.

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 yet another example of the present disclosure, in a base station for receiving channel state information (CSI) from a terminal in a wireless communication system, at least one transmitter; At least one receiver; At least one processor; And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed, wherein the specific operation is: the terminal First, configuration information related to beam management (BM) is transmitted, but the configuration information is configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality. Report setting information, or (i) first beam quality information related to the first beam having the highest beam quality and (ii) the same channel measurement resource (CMR) as the first beam, and the beam quality is Including at least one of second report setting information configured to report second beam quality information related to the lowest second beam; Transmitting a reference signal to the terminal; (I) an active (active) uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) transmitting control information related to scheduling; And receiving, from the terminal, the channel state information including beam quality information determined based on the configuration information and the reference signal through the scheduled PUSCH in the active uplink BWP. .

The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure are detailed below by those of ordinary skill in the art. It can be derived and understood based on the description.

According to the embodiments of the present disclosure, the following effects are achieved.

According to the present disclosure, from the viewpoint of a scheduler, a base station may select whether to obtain beam selection flexibility or improve throughput through reporting channel state information from a terminal. In addition, the base station can efficiently manage the beam to the terminal through the channel state information report.

In addition, since the base station sets channel state information to be reported by the terminal, the terminal can perform beam management with lower complexity.

The effects that can be obtained in the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects not mentioned are the technical fields to which the technical configuration of the present disclosure is applied from the description of the embodiments of the present disclosure below. Can be clearly derived and understood by those with ordinary knowledge. That is, unintended effects of implementing the configuration described in the present disclosure may also be derived from the embodiments of the present disclosure by a person of ordinary skill in the art.

The accompanying drawings are provided to aid 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 a specific drawing, and 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 applicable 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 present disclosure.

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

6 is a diagram illustrating physical channels 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 SS/PBCH block applicable to the present disclosure.

12 is a diagram briefly showing a configuration in which an SS/PBCH block applicable to the present disclosure is transmitted.

13 is a diagram showing the configuration of a higher layer parameter CSI-ReportConfig IE applicable to the present disclosure.

14 is a diagram briefly showing SSB/CSI-RS beam(s) for DL BM applicable to the present disclosure.

15 is a flowchart illustrating an example of a DL BM procedure using SSB applicable to the present disclosure.

16 is a diagram illustrating an example of a DL BM procedure using a CSI-RS applicable to the present disclosure, and FIG. 17 is a flowchart illustrating an example of a reception beam determination procedure of a terminal applicable to the present disclosure.

18 is a flowchart illustrating an example of a transmission beam determination process of a base station applicable to the present disclosure.

19 is a diagram illustrating an example of resource allocation in time and frequency domains related to the operation of FIG. 16 applicable to the present disclosure.

20 is a diagram illustrating an example of a UL BM procedure using an SRS applicable to the present disclosure.

21 is a flowchart illustrating an example of a UL BM procedure using SRS applicable to the present disclosure.

22 is a diagram briefly showing a Distributed Antenna System (DAS) applicable to the present disclosure.

23 is a diagram illustrating an example of a procedure for beam management between a terminal and a base station to which the methods described above in the present disclosure can be applied.

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

25 is a diagram briefly showing a DRX (Discontinuous Reception) cycle of a terminal applicable to the present disclosure.

26 is a diagram briefly showing the operation of a terminal and a base station according to an example of the present disclosure, FIG. 27 is a flowchart of an operation of a terminal according to an example of the present disclosure, and FIG. 28 is an operation of a base station according to an example of the present disclosure It is a flow chart.

The following embodiments are a combination of components and features of the present disclosure in a predetermined form. Each component or feature may be considered optional unless otherwise explicitly stated. 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 constitute an embodiment of the present disclosure. The order of operations described in the embodiments of the present disclosure may 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 have not been described, and procedures or steps that can be understood by those skilled in the art have not been described.

Throughout the specification, when a part is said to "comprising or including" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary. 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 a combination of hardware or software or hardware and software. It can be implemented as In addition, "a or an", "one", "the" and similar related words are different from this specification in the context of describing the present disclosure (especially in the context of the following claims). Unless otherwise indicated or clearly contradicted by context, it may be used in a sense encompassing both the singular and the plural.

In the present specification, embodiments of the present disclosure have been described centering on a data transmission/reception relationship 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 the mobile station. The specific operation described as being performed by the base station in this document may be performed by an upper node of the base station in some cases.

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

In addition, in embodiments of the present disclosure, a terminal is a user equipment (UE), a mobile station (MS), a subscriber station (SS), and a mobile subscriber station (MSS). , 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 a voice service, and the receiving end refers to a fixed and/or mobile node that receives a data service or a voice service. Accordingly, in the uplink, the mobile station may be the transmitting end and the base station may be the receiving end. Likewise, in the downlink, the mobile station may be the receiving end and the base station may be the transmitting end.

Embodiments of the present disclosure may be supported by standard documents disclosed in at least one of the IEEE 802.xx system, 3rd Generation Partnership Project (3GPP) system, 3GPP LTE system, 3GPP 5G NR system, and 3GPP2 system as radio access systems, 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 among the embodiments of the present disclosure may be described with reference to the above documents. In addition, all terms disclosed in this document can 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. The detailed description to be disclosed below together with the accompanying drawings is intended to describe exemplary embodiments of the present disclosure, and is not intended to represent the only embodiments in which the technical configuration of the present disclosure may be implemented.

In addition, specific terms used in the embodiments of the present disclosure are provided to aid understanding of the present disclosure, and the use of these specific terms may be changed in 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 wireless 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), single carrier frequency division multiple access (SC-FDMA), and the like. 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 will be mainly described with a 3GPP NR system. However, the embodiment proposed in the present disclosure may be equally applied to other wireless systems (eg, 3GPP LTE, IEEE 802.16, IEEE 802.11, etc.).

1. 본 개시가 적용되는 통신 시스템 예1. Example of a communication system to which the present disclosure is applied

Although not limited thereto, various descriptions, functions, procedures, proposals, 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, it will be illustrated in more detail with reference to the drawings. 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.

1, a communication system 1 applied to the present disclosure includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (eg, 5G NR (New RAT), LTE (Long Term Evolution)), and may be referred to as a communication/wireless/5G device. Although not limited thereto, wireless devices include robots 100a, vehicles 100b-1 and 100b-2, eXtended Reality (XR) devices 100c, hand-held devices 100d, and home appliances 100e. ), an Internet of Thing (IoT) device 100f, and an AI device/server 400. For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, and a vehicle capable of performing inter-vehicle communication. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (eg, a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, including HMD (Head-Mounted Device), HUD (Head-Up Display), TV, smartphone, It can be implemented in the form of a computer, wearable device, home appliance, digital signage, vehicle, robot, and the like. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), computers (eg, notebook computers, etc.). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors, smart meters, and the like. For example, the base station and the network may be implemented as a wireless device, and the specific wireless device 200a may operate as a base station/network node to another wireless device.

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 perform direct communication (e.g. sidelink communication) without going through the base station / network. For example, the vehicles 100b-1 and 100b-2 may perform direct communication (e.g. V2V (Vehicle to Vehicle)/V2X (Vehicle to Everything) communication). In addition, the IoT device (eg, sensor) may directly communicate with other IoT devices (eg, sensors) or other wireless devices 100a to 100f.

Wireless communication/

connections

150a, 150b, and 150c may be established between the wireless devices 100a to 100f / base station 200 and the base station 200 / base station 200. Here, wireless communication/connection includes various wireless access such as uplink/downlink communication 150a, sidelink communication 150b (or D2D communication), base station communication 150c (eg relay, Integrated Access Backhaul). This can be achieved through technology (eg 5G NR) Through wireless communication/

connections

150a, 150b, 150c, the wireless device and the base station/wireless device, and the base station and the base station can transmit/receive radio signals to each other. For example, the wireless communication/

connection

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

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

2 illustrates a wireless device applicable 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 the {wireless device 100x, the base station 200} and/or {wireless device 100x, wireless device 100x) of FIG. } Can be matched.

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 the 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 first information/signal, and then transmit a radio signal including the first information/signal through the transceiver 106. In addition, the processor 102 may store information obtained from signal processing of the second information/signal in the memory 104 after receiving a radio signal including the second information/signal through the transceiver 106. 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 may perform some or all of the processes controlled by the processor 102, or instructions for performing the descriptions, functions, procedures, suggestions, methods, and/or operational flow charts disclosed in this document. It can store software code including 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 may be coupled with the processor 102 and may transmit and/or receive radio signals through one or more antennas 108. The transceiver 106 may include a transmitter and/or a receiver. The transceiver 106 may be mixed with an RF (Radio Frequency) unit. In the present disclosure, a wireless device may mean a communication modem/circuit/chip.

The second wireless device 200 includes one or more processors 202 and 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 the 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 store information obtained from signal processing of the fourth information/signal in the memory 204 after receiving a radio signal including the fourth information/signal through the transceiver 206. 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 may perform some or all of the processes controlled by the processor 202, or instructions for performing the descriptions, functions, procedures, suggestions, methods and/or operational flow charts disclosed in this document. It can store software code including 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 may be connected to the processor 202 and may transmit and/or receive radio signals through one or more antennas 208. The transceiver 206 may include a transmitter and/or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may mean a communication modem/circuit/chip.

Hereinafter, the hardware elements of the

wireless devices

100 and 200 will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or

more processors

102, 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). One or

more processors

102, 202 may be configured to generate one or more Protocol Data Units (PDUs) and/or one or more Service Data Units (SDUs) according to the description, functions, procedures, proposals, methods, and/or operational flow charts disclosed in this document. Can be generated. One or

more processors

102, 202 may generate messages, control information, data, or information according to the description, function, procedure, suggestion, method, and/or operational flow chart disclosed herein. At least one processor (102, 202) generates a signal (e.g., a baseband signal) including PDU, SDU, message, control information, data or information according to the functions, procedures, proposals and/or methods disclosed herein. , It may be provided to one or more transceivers (106, 206). One or

more processors

102, 202 may receive signals (e.g., baseband signals) from one or

more transceivers

106, 206, and the descriptions, functions, procedures, proposals, methods, and/or operational flowcharts disclosed herein PDUs, SDUs, messages, control information, data, or information may be obtained according to the parameters.

One or more of the

processors

102 and 202 may be referred to as a controller, microcontroller, microprocessor, or microcomputer. One or more of the

processors

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

more processors

102 and 202. The description, functions, procedures, suggestions, methods, and/or operational flow charts 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 description, functions, procedures, proposals, methods and/or operational flow charts disclosed in this document are included in one or

more processors

102, 202, or stored in one or

more memories

104, 204, and are It may be driven by the

above processors

102 and 202. The descriptions, functions, procedures, proposals, methods and/or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and/or a set of instructions.

One or

more memories

104 and 204 may be connected to one or

more processors

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

more memories

104 and 204 may be composed of ROM, RAM, EPROM, flash memory, hard drive, register, cache memory, computer readable storage medium, and/or combinations thereof. One or

more memories

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

more processors

102 and 202. In addition, one or

more memories

104, 204 may be connected to one or

more processors

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

The one or

more transceivers

106 and 206 may transmit user data, control information, radio signals/channels, and the like mentioned in the methods and/or operation flow charts of this document to one or more other devices. One or more transceivers (106, 206) may receive user data, control information, radio signals/channels, etc. mentioned in the description, functions, procedures, suggestions, methods and/or operation flow charts disclosed in this document from one or more other devices. have. For example, one or

more transceivers

106 and 206 may be connected to one or

more processors

102 and 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 radio 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 radio signals from one or more other devices. In addition, one or more transceivers (106, 206) may be connected with one or more antennas (108, 208), and one or more transceivers (106, 206) through one or more antennas (108, 208), the description and functionality disclosed in this document. It may be set to transmit and receive user data, control information, radio signals/channels, and the like mentioned in a procedure, a proposal, a method and/or an operation flowchart. In this document, one or more antennas may be a plurality of physical antennas or a plurality of logical antennas (eg, antenna ports). One or more transceivers (106, 206) in order to process the received user data, control information, radio signal / channel, etc. using one or more processors (102, 202), the received radio signal / channel, etc. in the RF band signal. It can be converted into a baseband signal. One or

more transceivers

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

more processors

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

transceivers

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

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

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-examples/services (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 ) Can be composed of. For example, the

wireless devices

100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit may include a communication circuit 112 and a transceiver(s) 114. For example, communication circuitry 112 may include one or more processors 102,202 and/or one or more memories 104,204 of FIG. 2. 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 all 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 the information stored in the memory unit 130 to an external (eg, other communication device) through the communication unit 110 through a wireless/wired interface, or through the communication unit 110 to the outside (eg, 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 I/O unit, a driving unit, and a computing unit. Although not limited to this, wireless devices include robots (Fig. 1, 100a), vehicles (Fig. 1, 100b-1, 100b-2), XR equipment (Fig. 1, 100c), portable equipment (Fig. 1, 100d), and home 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 (Fig. 1, 400), a base station (Fig. 1, 200), and a network node. The wireless device can be used in a mobile or fixed location depending on the use-example/service.

In FIG. 3, various elements, components, units/units, and/or modules in the

wireless devices

100 and 200 may be entirely interconnected through a wired interface, or at least some may be wirelessly connected 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, 140) are connected through the communication unit 110. Can be connected wirelessly. In addition, each element, component, unit/unit, and/or module in the

wireless device

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

Hereinafter, an 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. Portable devices may include smart phones, smart pads, wearable devices (eg, smart watches, smart glasses), and portable computers (eg, notebook computers). The portable 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 portable device 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a memory unit 130, a power supply unit 140a, an interface unit 140b, and an input/output unit 140c. ) Can be included. The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110 to 130/140a to 140c correspond to blocks 110 to 130/140 of FIG. 1, 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 components of the portable device 100. The controller 120 may include an application processor (AP). The memory unit 130 may store data/parameters/programs/codes/commands required for driving the portable device 100. Also, the memory unit 130 may store input/output data/information, and the like. 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 connection between the portable 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/signals (eg, touch, text, voice, image, video) input from the user, and the obtained information/signals are stored in the memory unit 130. Can be saved. The communication unit 110 may convert information/signals stored in the memory into wireless signals, and may directly transmit the converted wireless signals to other wireless devices or to a base station. In addition, after receiving a radio signal from another radio device or a base station, the communication unit 110 may restore the received radio signal to the original information/signal. After the restored information/signal is stored in the memory unit 130, it may 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 an autonomous vehicle applied to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, a vehicle, a train, an aerial vehicle (AV), or a ship.

5, the vehicle or autonomous driving 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 unit (140d). The antenna unit 108 may be configured as a part of the communication unit 110. Blocks 110/130/140a to 140d correspond to blocks 110/130/140 of 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, roadside base stations, etc.), and servers. The controller 120 may perform various operations by controlling elements of the vehicle or the autonomous vehicle 100. The control unit 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, a wheel, a brake, a steering device, and the like. 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 is an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, and a vehicle advancement. /Reverse sensor, battery sensor, fuel sensor, tire sensor, steering sensor, temperature sensor, humidity sensor, ultrasonic sensor, illumination sensor, pedal position sensor, etc. may be included. The autonomous driving unit 140d is a technology for maintaining a driving lane, a technology for automatically adjusting the speed such as adaptive cruise control, a technology for automatically driving along a predetermined route, and for driving by automatically setting a route when a destination is set. Technology, etc. can be implemented.

For example, the communication unit 110 may receive map data and traffic information data from an external server. The autonomous driving unit 140d may generate an autonomous driving route and a driving plan based on the acquired data. The controller 120 may control the driving unit 140a so that the vehicle or the autonomous driving vehicle 100 moves along the autonomous driving path according to the driving plan (eg, speed/direction adjustment). During autonomous driving, the communication unit 110 asynchronously/periodically acquires the latest traffic information data from an external server, and may acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit 140c may acquire vehicle state and surrounding environment information. The autonomous driving unit 140d may update the autonomous driving route and the driving plan based on the newly acquired data/information. The communication unit 110 may transmit information about 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 information collected from the vehicle or autonomously driving vehicles, and may provide the predicted traffic information data to the vehicle or autonomously driving vehicles.

4. NR 시스템4. NR system

4.1. 물리 채널들 및 일반적인 신호 전송4.1. Physical channels and general signal transmission

In a wireless access system, a terminal receives information from a base station through a downlink (DL) and transmits information to the base station through an 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 information transmitted and received by them.

6 is a diagram illustrating physical channels that can be used in embodiments of the present disclosure and a signal transmission method using them.

When the power is turned on again while the power is turned off, the terminal newly entering the cell performs an initial cell search operation such as synchronizing with the base station in step S11. To this end, the UE receives a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station, and obtains information such as cell ID.

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

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

After completing the initial cell search, the UE receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) according to the physical downlink control channel information in step S12 and further Specific system information can be obtained.

Thereafter, the UE may perform a random access procedure, such as steps S13 to S16, to complete access to the base station. To this end, the UE transmits a preamble through a physical random access channel (PRACH) (S13), and a 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 the scheduling information in the RAR (S15), and a contention resolution procedure such as receiving a physical downlink control channel signal and a corresponding physical downlink shared channel signal. ) Can be performed (S16).

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

Control information transmitted by the UE 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, etc.

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

5.2. 무선 프레임 (Radio Frame) 구조5.2. Radio Frame structure

Uplink and downlink transmission based on the NR system is based on the frame shown in FIG. 7. One radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). One half-frame is defined as five 1ms subframes (Subframe, SF). 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). When a normal CP is used, each slot includes 14 symbols. When the extended CP is used, each slot includes 12 symbols. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), 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 a general CP is used, and Table 2 shows the number of slots per 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, ^slot N _symb denotes the number of a symbol in the slot, N ^{frame, μ} denotes a _slot number of a slot within a frame, ^{subframe N, μ} _slot is the number of slots within a subframe.

In an NR system to which the present disclosure can be applied, OFDM(A) numerology (eg, SCS, CP length, etc.) may be set differently between a plurality of cells merged into one terminal. Accordingly, the (absolute time) section of the time resource (eg, SF, slot or TTI) (for convenience, collectively referred to as TU (Time Unit)) composed of the same number of symbols may be set differently between the 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 (wider carrier bandwidth) is supported, 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 and FR2 can be configured as shown in the table below. Further, FR2 may mean a 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. RB (Resource Block) is defined as a plurality of (eg, 12) consecutive subcarriers in the frequency domain.

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

The carrier may contain up to N (eg, 5) BWPs. Data communication is performed through the activated BWP, and only one BWP can be activated to 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 shaded area (eg, symbol index = 0) indicates a downlink control area, and a black area (eg, symbol index = 13) indicates an uplink control area. Other areas (eg, symbol index = 1 to 12) may be used for downlink data transmission or uplink data transmission.

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

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

In the foregoing detailed description, a case where the self-supporting slot structure includes both a DL control area and a UL control area has been described, but the control areas may be selectively included in the self-supporting slot structure. In other words, the self-supporting slot structure according to the present disclosure may include not only a case including both a DL control region and a UL control region as shown in FIG. 9, but also a case including only the DL control region or the UL control region.

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 a 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.

On the 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, positive acknowledgment/negative acknowledgment (ACK/NACK) information for DL data, channel state information (CSI) information, scheduling request (SR), and the like may be transmitted.

The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB), and modulation methods such as Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM are used. Apply. A codeword is generated by encoding TB. The PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, 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 demodulation reference signal (DMRS) to generate an OFDM symbol signal, and is 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, 16 Control Channel Elements (CCEs) according to the Aggregation Level (AL). One CCE consists of 6 REGs (Resource Element Group). 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 an RE to which DMRS is mapped. The 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 REG set with a given pneumonology (eg, SCS, CP length, etc.). A plurality of CORESETs for one terminal 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 constituting CORESET and the number of symbols (maximum 3) may be set by higher layer signaling.

PUSCH carries uplink data (e.g., UL-shared channel transport block, UL-SCH TB) and/or uplink control information (UCI), and CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) waveform Alternatively, 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, when transform precoding is not possible (eg, transform precoding is disabled), the UE transmits a PUSCH based on the CP-OFDM waveform, and when 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 the UL grant in the DCI or is semi-static based on higher layer (e.g., RRC) signaling (and/or Layer 1 (L1) signaling (e.g., PDCCH)). Can be scheduled (configured grant). PUSCH transmission may be performed based on a codebook or a non-codebook.

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

PUCCH format 1 carries UCI of a maximum size of 2 bits, and the modulation symbol is spread by an orthogonal cover code (OCC) (set differently depending on whether or not frequency hopping) in the time domain. The DMRS is transmitted in a symbol in which a modulation symbol is not transmitted (that is, it is transmitted after time division multiplexing (TDM)).

PUCCH format 2 carries UCI of a bit size larger than 2 bits, and a modulation symbol is transmitted after DMRS and FDM (Frequency Division Multiplexing). The DMRS is located at symbol indexes #1, #4, #7, and #10 in a given resource block with a density of 1/3. A PN (Pseudo Noise) sequence is used for the DMRS sequence. Frequency hopping may be activated for 2-symbol PUCCH format 2.

PUCCH format 3 does not perform multiplexing of terminals within the same physical resource blocks, and carries UCI with a bit size larger than 2 bits. In other words, the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code. The modulation symbols are transmitted after DMRS and TDM (Time Division Multiplexing).

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

4.3. 동기 신호 블록 (Synchronization Signal Block, SSB 또는 SS/PBCH block)4.3. Synchronization Signal Block (SSB or SS/PBCH block)

In the NR system to which the present disclosure is applicable, PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal) and/or PBCH (Physical Broadcast Channel) is one synchronization signal block (Synchronization Signal Block or Synchronization Signal PBCH block, hereinafter SS block or SS/PBCH block). In this case, multiplexing of other signals within the one SS block may not be excluded. (Multiplexing other signals are not precluded within a'SS block').

The SS/PBCH block may be transmitted in a band other than the center of the system band. In particular, when the base station supports broadband operation, the base station may transmit a plurality of SS/PBCH blocks.

As shown in FIG. 11, the SS/PBCH block applicable to the present disclosure may be composed of 20 RBs within 4 consecutive OFDM symbols. In addition, the SS/PBCH block is composed of PSS, SSS and PBCH, and the UE can perform cell search, system information acquisition, beam alignment for initial access, and DL measurement based on the SS/PBCH block. .

The PSS and SSS are each composed of 1 OFDM symbol and 127 subcarriers, and the PBCH is composed of 3 OFDM symbols and 576 subcarriers. Polar coding and Quadrature Phase Shift Keying (QPSK) are applied to the PBCH. The PBCH consists of a data RE and a demodulation reference signal (DMRS) RE for each OFDM symbol. There are 3 DMRS REs for each RB, and 3 data REs exist between the DMRS REs. At this time, the location of the DMRS RE may be determined based on the cell ID (eg, a subcarrier index mapped based on the value of N ^cell _ID mod 4 may be determined).

In addition, the SS/PBCH block may be transmitted in a frequency band other than the center frequency of the frequency band used by the network.

To this end, in the NR system to which the present disclosure is applicable, a synchronization raster, which is a candidate frequency position at which the UE should detect an SS/PBCH block, is defined. The synchronization raster may be distinguished from a channel raster.

The synchronization raster may indicate a frequency location of an SS/PBCH block that can be used by the UE to obtain system information when there is no explicit signaling for the location of the SS/PBCH block.

In this case, the synchronization raster may be determined based on a Global Synchronization Channel Number (GSCN). The GSCN may be transmitted through RRC signaling (eg, Master Information Block (MIB), System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.).

Such a synchronization raster is defined longer in the frequency axis than a channel raster in consideration of the complexity and detection speed of initial synchronization and has fewer blind detections.

In an NR system to which the present disclosure is applicable, the base station may transmit an SS/PBCH block up to 64 times for 5 ms. At this time, a plurality of SS/PBCH blocks are transmitted in different transmission beams, and the UE detects the SS/PBCH block assuming that the SS/PBCH block is transmitted every 20 ms period based on one specific beam used for transmission. can do.

The maximum number of beams that the base station can use for SS/PBCH block transmission within a 5ms time interval may be set larger as the frequency band increases. For example, in a band below 3GHz, the base station may transmit an SS/PBCH block using up to 4 different beams in a 5ms time interval, up to 8 in a 3-6GHz band, and up to 64 different beams in a band above 6GHz.

4.4. 동기화 절차 (Synchronization procedure)4.4. Synchronization procedure

The terminal may perform synchronization by receiving the SS/PBCH block as described above from the base station. In this case, the synchronization procedure largely includes a cell ID detection step and a timing detection step. Here, the cell ID detection step may include a cell ID detection step based on PSS and a cell ID detection step based on SSS (eg, detecting one physical layer cell ID among a total of 1008 physical layer cell IDs). In addition, the timing detection step may include a timing detection step based on PBCH DM-RS (Demodulation Reference Signal) and a timing detection step based on PBCH content (eg, MIB (Master Information Block)).

To this end, the UE may assume that PBCH, PSS, and SSS reception occasions exist on consecutive symbols. (That is, the UE may assume that the PBCH, PSS, and SSS constitute the SS/PBCH block, as described above). Subsequently, the UE may assume that SSS, PBCH DM-RS, and PBCH data have the same Energy Per Resource Element (EPRE). In this case, the UE may assume that the ratio of PSS EPRE to SSS EPRE of the SS/PBCH block in the corresponding cell is 0 dB or 3 dB. Or, when dedicated higher layer parameters (dedicated higher layer parameters) are not provided to the terminal, SI-RNTI (System Information-Random Network Temporary Identifier), P-RNTI (Paging-Random Network Temporary Identifier), or RA-RNTI The UE monitoring the PDCCH for DCI format 1_0 with CRC (Cyclic Redundancy Check) scrambled by (Random Access-Random Network Temporary Identifier) is the ratio of PDCCH DMRS EPRE to SSS EPRE (ratio of PDCCH DMRS EPRE to SSS EPRE) It can be assumed to be within -8 dB to 8 dB.

First, the UE may acquire time synchronization and a physical cell ID of the detected cell through PSS and SSS detection. More specifically, the terminal may acquire symbol timing for an SS block through PSS detection, and may detect a cell ID within a cell ID group. Subsequently, the terminal detects the cell ID group through SSS detection.

In addition, the UE may detect the time index (eg, slot boundary) of the SS block through the DM-RS of the PBCH. Subsequently, the terminal may obtain half frame boundary information and system frame number (SFN) information through the MIB included in the PBCH.

In this case, the PBCH may inform that the related (or corresponding) RMSI PDCCH/PDSCH is transmitted in the same band as the SS/PBCH block or in a different band. Accordingly, the UE can receive RMSI (e.g., system information other than MIB (Master Information Block, MIB)) transmitted later in the frequency band indicated by the PBCH or the frequency band in which the PBCH is transmitted after decoding the PBCH. have.

For an SS/PBCH block in a half frame, first symbol indices for candidate SS/PBCH blocks may be determined according to subcarrier spacing of SS/PBCH blocks as follows. At this time, index #0 corresponds to the first symbol of the first slot in the half frame.

(Case A: 15 kHz subcarrier spacing) The first symbols of candidate SS/PBCH blocks may have symbols of {2, 8} + 14*n. For frequency bands below 3 GHz, n has a value of 0 or 1. For frequency bands above 3 GHz and below 6 GHz, n has a value of 0, 1, 2 or 3.

(Case B: 30 kHz subcarrier spacing) The first symbols of candidate SS/PBCH blocks may have symbols of {4, 8, 16, 32} + 28*n. For frequency bands below 3 GHz, n has a value of 0. For frequency bands above 3 GHz and below 6 GHz, n has a value of 0 or 1.

(Case C: 30 kHz subcarrier spacing) The first symbols of candidate SS/PBCH blocks may have symbols of {2, 8} + 14*n. For frequency bands below 3 GHz, n has a value of 0 or 1. For frequency bands above 3 GHz and below 6 GHz, n has a value of 0, 1, 2 or 3.

(Case D: 120 kHz subcarrier spacing) The first symbols of the candidate SS/PBCH blocks may have symbols of {4, 8, 16, 20} + 28*n. For frequency bands above 6 GHz, n has values of 0, 1, 2, 3, 5, 6, 7, 8, 19, 11, 12, 13, 15, 16, 17 or 18.

(Case E: 240 kHz subcarrier spacing) The first symbols of the candidate SS/PBCH blocks may have symbols of {8, 12, 16, 20, 32, 36, 40, 44} + 56*n. For frequency bands above 6 GHz, n has values of 0, 1, 2, 3, 5, 6, 7 or 8.

In connection with the above operation, the terminal may obtain system information.

The MIB includes information/parameters for monitoring a PDCCH scheduling a PDSCH carrying a System Information Block1 (SIB1), and is transmitted by the base station to the terminal through the PBCH in the SS/PBCH block.

The UE may check whether there is a CORESET (Control Resource Set) for the Type0-PDCCH common search space based on the MIB. The Type0-PDCCH common search space is a kind of PDCCH search space, and is used to transmit a PDCCH for scheduling SI messages.

If there is a Type0-PDCCH common search space, the UE is based on information in the MIB (e.g., pdcch-ConfigSIB1), based on (i) a plurality of contiguous resource blocks constituting the CORESET and one or more consecutive (consecutive) Symbols and (ii) a PDCCH opportunity (eg, a time domain location for PDCCH reception) may be determined.

When the Type0-PDCCH common search space does not exist, pdcch-ConfigSIB1 provides information on a frequency location in which SSB/SIB1 exists and a frequency range in which SSB/SIB1 does not exist.

SIB1 includes information related to availability and scheduling (eg, transmission period, SI-window size) of the remaining SIBs (hereinafter, SIBx, x is an integer greater than or equal to 2). For example, SIB1 may inform whether SIBx is periodically broadcast or is provided by an on-demand method (or at a request of a terminal). When SIBx is provided by an on-demand method, SIB1 may include information necessary for the UE to perform an SI request. SIB1 is transmitted through the PDSCH, the PDCCH scheduling SIB1 is transmitted through the Type0-PDCCH common search space, and SIB1 is transmitted through the PDSCH indicated by the PDCCH.

4.5. 동기화 래스터 (Synchronization raster)4.5. Synchronization raster

Synchronization raster means a frequency location of an SSB that can be used by a terminal for system information acquisition when there is no explicit signaling for the SSB location. The global synchronization raster is defined for all frequencies. The frequency position of the SSB is defined by the SS _REF and the corresponding number GSCN (Global Synchronization Channel Number). The parameters defining SS _REF and GSCN for all frequency ranges are as follows.

The mapping between the synchronization raster and the resource block of the corresponding SSB may be based on the following table. The mapping depends on the total number of resource blocks allocated in the channel, and can be applied to both UL and DL.

4.6. DCI 포맷4.6. DCI format

In an 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 may additionally support DCI format 2_0, DCI format 2_1, DCI format 2_2, and DCI format 2_3.

Here, DCI format 0_0 is used to schedule 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)) When base signal transmission/reception is configured), it may be used to schedule a CBG-based (or CBG-level) PUSCH.

In addition, DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 is a 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 PDSCH.

In addition, DCI format 2_0 is used to inform the slot format (used for notifying the slot format), DCI format 2_1 is used to inform the PRB and OFDM symbols assuming 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 the PUCCH and PUSCH Transmission Power Control (TPC) commands. , DCI format 2_3 may be used for transmission of a TPC command group 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 is n2 (i.e. When set to 2), an MCS/NDI/RV field for transport block 2 may be further included.

In particular, when the upper layer parameter maxNrofCodeWordsScheduledByDCI is set to n2 (i.e., 2), whether or not the transport block is substantially usable (enable/disable) may be determined by a combination of the MCS field and the 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.

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

4.7. 안테나 포트 의사 코-로케이션 (antenna ports quasi co-location)4.7. Antenna ports quasi co-location

A list of maximum M Transmission Configuration Indicator (TCI) state settings may be configured for one terminal. The maximum M TCI state setting may be set by a higher layer parameter PDSCH-Config so that (the terminal) can decode the PDSCH according to the detection of the PDCCH including the DCI intended for the terminal 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 an upper layer parameter qcl-Type1 for a first downlink reference signal (DL RS) and a higher layer parameter qcl-Type2 (if set) for a second DL RS. For the case of two DL RSs, regardless of whether the reference signals are the same DL RS or different DL RSs, the QCL types should not be the same (shall not be the same). The QCL types correspond to each DL RS given by the higher layer parameter qcl-Type in the higher layer parameter QCL-Info , and the QCL types may 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 UE receives an 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 the TCIs states and the code points of the TCI field in the DCI is slot #(n+3*N ^{subframe, μ} _slot + It can be applied from 1). Here, N ^{subframe and} _μslot are determined based on Table 1 or Table 2 described above. After the UE receives the initial higher layer configuration of the TCI states and before the UE receives the activation command, the UE has the DMRS port(s) of the PDSCH of the serving cell as'QCL-TypeA. From the point of view, it is assumed that the SS/PBCH (Synchronization Signal/Physical Broadcast Channel) block and QCL determined in the initial access procedure are performed. Additionally, at the time point, the UE may assume that the DMRS port(s) of the PDSCH of the serving cell are QCL with the SS/PBCH block determined in the initial access procedure in terms of'QCL-TypeD'.

When the upper layer parameter tci-PresentInDCI is set to'enabled ' for CORESET scheduling the 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 according to 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 ), if greater than or equal to, in order to determine the PDSCH antenna port QCL, the UE uses the TCI state or QCL assumption for the PDSCH for PDCCH transmission. It is assumed to be 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 the DCI scheduling CC (component carrier) indicates the activated TCI states in the scheduled CC or DL BW (point to), the PDSCH Is scheduled according to DCI format 1_1, the UE uses the TCI-State based on the TCI field included in the DCI in the detected PDCCH to determine the PDSCH antenna port QCL. When the time offset between the DL DCI reception time and the corresponding PDSCH reception time is greater than or equal to the threshold Threshold-Sched-Offset (the threshold is determined based on the reported UE capability), the UE is the PDSCH of the serving cell. It is assumed that the DMRS port(s) are RS(s) and QCL 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 terminal, the indicated TCI state should be based on 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, and the search When one or more TCI states set for a serving cell scheduled by a region set include'QCL-TypeD', the UE is a time offset between a reception time of a PDCCH detected in the search region set and a reception time of a corresponding PDSCH Expects to be greater than or equal to the threshold 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 it is smaller than Threshold-Sched-Offset , the UE assumes the following. (i) The DMRS port(s) of the PDSCH of the serving cell have a QCL relationship with the RS(s) of the TCI state and the QCL parameter(s). (ii) At this time, the QCL parameter(s) is 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 the PDCCH QCL indication of the CORESET associated with the monitored search area QCL parameter(s) used (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 reception of the PDCCH associated with the corresponding CORESET. This operation can also be applied equally to the case of intra-band CA (if PDSCH and CORESET are in different CCs). If there is no TCI state including'QCL-TypeD' among the configured TCI states, the terminal is the TCI indicated for the scheduled PDSCH, regardless of the time offset between the reception time of the DL DCI and the reception time of the corresponding PDSCH Another QCL assumption is obtained from state.

For periodic CSI-RS resources in the upper layer parameter NZP-CSI-RS-ResourceSet in which the upper layer parameter trs-Info is configured, 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 applicable),'QCL-TypeD' for the same SS/PBCH block, or

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

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

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

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

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

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

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

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

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

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

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

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

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

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

In the following tables, when there are rows including the same RS type, it can be assumed that the same RS ID is applied.

As an example, when there is a CSI-RS resource set by the upper layer parameter NZP-CSI-RS-ResourceSet together with the upper layer parameter trs-Info , the UE is capable of the following two of the upper layer parameter TCI-State You can only expect settings.

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

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

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

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

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

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

For the DMRS of the PDCCH, the UE has only 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 the TRS is configured. Can be expected.

In the above table, * may mean a setting that can be applied before the 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 the DMRS of the PDCCH, the UE has only three possible settings of the upper layer parameter TCI-State while the fourth setting (the fourth row of the two tables below) is valid (by default) before the TRS is configured. Can be expected.

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

4.8. CSI-RS (channel state information reference signal)4.8. CSI-RS (channel state information reference signal)

In the mobile communication system according to the present disclosure, a method capable of improving transmission/reception data efficiency by adopting multiple transmission antennas and multiple reception antennas for packet transmission is used. When transmitting and receiving data using a multiple input/output antenna, a channel state between the transmitting antenna and the receiving antenna must be detected in order to accurately receive signals. 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 a CSI-RS.

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

-The NZP CSI-RS may be configured by the NZP-CSI-RS-Resource IE (Information Element) or the CSI-RS-Resource-Mobility field in the 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 may be set by the ZP-CSI-RS-Resource IE. The UE may assume that the resource configured for the ZP CSI-RS is not used for PDSCH transmission. The UE may perform the same measurement/reception on channels/signals except PDSCH regardless of whether the channel/signal excluding the PDSCH collides with the ZP CSI-RS. 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.

4.9. CSI 보고를 위한 설정 파라미터 (예: CSI-ReportConfig IE)4.9. Configuration parameters for CSI reporting (e.g. CSI-ReportConfig IE)

For CSI reporting applicable to the present disclosure, a configuration parameter for CSI reporting (eg, CSI-ReportConfig ) may be configured in the terminal.

In this case, resourceForChannelMeasurement , csi-IM-ResourceForInterference , and nzp-CSI-RS-ResourceForInterference in the CSI-ReportConfig IE may have the following relationship.

In this case, based on the relationship as described above, CSI calculation may be performed as follows.

Depending on whether the groupBasedBeamReporting parameter in the CSI-ReportConfig IE is'enabled 'or'diabled', the report for reportQuantity = {cri-RSRP or ssb-Index-RSRP} can be classified as follows.

For L1-RSRP calculation, the UE may be configured as follows. In this case, the terminal may perform the following report according to nrofReportedRS or groupBasedBeamReporting .

Additionally, for CSI (Channel Quality Indicator) reporting among CSI according to the present disclosure, the UE may refer to the following tables defined in Section 5.2.2.1 of 3GPP TS 38.214. More specifically, the UE may report CQI information (eg, index) closest to the measured CQI to the base station based on the following tables.

4.10. RSRP (Reference Signal Received Power) 보고4.10. RSRP (Reference Signal Received Power) report

The UE may refer to the following table for RSRP reporting. More specifically, the UE may report RSRP information (eg, index) closest to the measured RSRP to the base station based on the following table.

4.11. 빔 관리 (Beam management) 4.11. Beam management

The base station reports periodic Channel State Information (CSI)/beam, semi-persistent CSI/beam report to the terminal (e.g., periodic reporting is activated only during a specific time period, or the terminal performs a number of consecutive reports), Alternatively, you can request aperiodic CSI/beam report.

Here, the CSI report information may include one or more of the following information.

-RI (rank indicator). Example: Information on how many layers/streams the terminal wants to receive simultaneously

-PMI (precoder matrix indication). Example: Information on which MIMO (Multiple Input Multiple Output) precoding the base station prefers to apply from the terminal point of view

-CQI (channel quality information). Example: Channel quality information considering the strength of the desired signal and the strength of the interference signal

-CRI (CSI-RS resource indicator). Example: CSI-RS resource index preferred by the UE among a plurality of (applying different beamforming) CSI-RS resources

-LI (layer indicator). The index of the layer with the best quality from the point of view of the terminal

In addition, the beam report information includes a CRI indicating a preferred beam index when the RS for beam quality measurement is a CSI-RS, an SSBID indicating a preferred beam index when the beam quality measurement RS is SSB, and an RSRP (RS received power) indicating beam quality. ) It can be composed of a specific combination of information, etc.

For periodic and semi-persistent (SP) CSI/beam reporting of the UE, the base station provides the UE with an UL (uplink) physical channel for CSI/beam reporting during a time period in which the corresponding report is activated at a specific period (e.g. : PUCCH, PUSCH) can be allocated. In addition, for CSI measurement of the terminal, the base station may transmit a downlink reference signal (DL RS) to the terminal.

(Analog) In a beamformed system to which beamforming is applied, the DL transmission (Tx)/reception (Rx) beam pair and UCI (uplink control information) for the DL RS transmission/reception: e.g.: CSI, ACK/ NACK) It is necessary to determine a UL Tx/Rx beam pair for transmission/reception.

The DL beam pair determination procedure includes (i) a TRP Tx beam selection procedure in which a base station transmits a DL RS corresponding to a plurality of TRP Tx beams to a terminal, and the terminal selects and/or reports one of them, and (ii ) The base station repeatedly transmits the same RS signal corresponding to each TRP Tx beam, and in response thereto, the UE measures the repeatedly transmitted signals with different UE Rx beams to select a UE Rx beam. .

The UL beam pair determination procedure includes: (i) a UE Tx beam selection procedure in which the UE transmits UL RSs corresponding to a plurality of UE Tx beams to a base station, and the base station selects and/or signals one of them, and (ii ) It may consist of a combination of procedures in which the UE repeatedly transmits the same RS signal corresponding to the UE Tx beam, and the base station measures the repeatedly transmitted signals with different TRP Rx beams in response thereto and selects a TRP Rx beam.

When the beam reciprocity (or beam correspondence) of DL/UL is established (e.g., in communication between the base station and the terminal, it is assumed that the base station DL Tx beam and the base station UL Rx beam coincide, and the terminal UL Tx beam and the terminal DL Rx beam coincide If possible), if only one of the DL beam pair and the UL beam pair is determined, the procedure for determining the other may be omitted.

The process of determining a DL and/or UL beam pair may be performed periodically or aperiodically. For example, when the number of candidate beams is large, the required RS overhead may increase. In this case, the process of determining a DL and/or UL beam pair may be performed at a predetermined period in consideration of the RS overhead.

After the DL/UL beam pair determination process is completed, the UE may perform periodic or SP CSI reporting. The CSI-RS including a single or a plurality of antenna ports for CSI measurement of the UE may be beamformed and transmitted in a TRP Tx beam determined as a DL beam. In this case, the transmission period of the CSI-RS may be set equal to the CSI reporting period of the UE or shorter than the CSI reporting period of the UE.

Alternatively, the base station may transmit the aperiodic CSI-RS according to the CSI reporting period of the terminal or more frequently than the CSI reporting period of the terminal.

The UE may transmit the measured CSI information using a UL Tx beam determined in a periodic UL beam pair determination process.

More specifically, in the present disclosure, the beam management (BM) procedure is a base station (eg, gNB, TRP, etc.) that can be used for downlink (downlink, DL) and uplink (uplink, UL) transmission/reception. And/or as L1 (layer 1) / L2 (layer 2) procedures for obtaining and maintaining a set of beams of a terminal (eg, UE), the following procedures and terms may be included.

-Beam measurement: The base station or the UE measures the characteristics of the received beamforming signal

-Beam determination: An operation in which the base station or the terminal selects its own transmission beam (Tx beam) / reception beam (Rx beam)

-Beam sweeping: An operation of covering a spatial area using a transmission and/or reception beam for a predetermined time interval in a predetermined manner.

-Beam report: an operation in which the terminal reports information on a beam formed signal based on beam measurement

The BM procedure can be divided into (1) a DL BM procedure using a synchronization signal (SS)/physical broadcast channel (PBCH) block or a CSI-RS, and (2) a UL BM procedure using a sounding reference signal (SRS).

In addition, each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

4.11.1. DL BM

The DL BM procedure may include (1) transmission of beamformed DL RS (reference signals) (eg, CSI-RS or SS Block (SSB)) of the base station, and (2) beam reporting of the terminal.

Here, the beam reporting may include a preferred (preferred) DL RS identifier (s) and a corresponding L1-RSRP (Reference Signal Received Power).

The DL RS ID may be an SSB Resource Indicator (SSBRI) or a CSI-RS Resource Indicator (CRI).

As shown in FIG. 14, the SSB beam and the CSI-RS beam may be used for beam measurement. The measurement metric is L1-RSRP for each resource/block. SSB is used for coarse beam measurement, and CSI-RS can be used for fine beam measurement. SSB can be used for both Tx beam sweeping and Rx beam sweeping.

Rx beam sweeping using SSB may be performed while the UE changes the Rx beam for the same SSBRI over a plurality of SSB bursts. Here, one SS burst includes one or more SSBs, and one SS burst set includes one or more SSB bursts.

The configuration for the beam report using SSB is performed in CSI/beam configuration in the RRC connected state (or RRC connected mode).

-The terminal receives a CSI-ResourceConfig IE including a CSI-SSB-ResourceSetList including SSB resources used for BM from the base station (S1510).

Table 18 shows an example of CSI-ResourceConfig IE, BM configuration using SSB is not separately defined, and SSB is set like CSI-RS resource.

In Table 18, the csi-SSB-ResourceSetList parameter represents a list of SSB resources used for beam management and reporting in one resource set. Here, the SSB resource set is {SSBx1, SSBx2, SSBx3, SSBx4, ... Can be set to }. SSB index can be defined from 0 to 63.

-The terminal receives an SSB resource from the base station based on the CSI-SSB-ResourceSetList (S1520).

-When the CSI-RS reportConfig related to reporting for SSBRI and L1-RSRP is configured, the terminal reports the best SSBRI and the corresponding L1-RSRP to the base station (beam) (S1530).

That is, when the reportQuantity of the CSI-RS reportConfig IE is set to'ssb-Index-RSRP', the UE reports the best SSBRI and the corresponding L1-RSRP to the base station.

And, when the UE is configured with a CSI-RS resource in the same OFDM symbol(s) as SSB (SS/PBCH Block) and'QCL-TypeD' is applicable, the UE has CSI-RS and SSB'QCL-TypeD' 'From the point of view, we can assume that it is quasi co-located.

Here, the QCL TypeD may mean that QCL is performed between antenna ports in terms of a spatial Rx parameter. When the UE receives a plurality of DL antenna ports in QCL Type D relationship, the same reception beam may be applied. In addition, the UE does not expect the CSI-RS to be configured in the RE overlapping the RE of the SSB.

4.11.2. DL BM using CSI-RS

Looking at the use of CSI-RS, i) when a repetition parameter is set in a specific CSI-RS resource set and TRS_info is not set, the CSI-RS is used for beam management. ii) When the repetition parameter is not set and TRS_info is set, the CSI-RS is used for a tracking reference signal (TRS). iii) If the repetition parameter is not set and TRS_info is not set, the CSI-RS is used for CSI acquisition.

This, repetition parameter may be set only for CSI-RS resource sets linked with L1 RSRP or CSI-ReportConfig having a report of'No Report (or None)'.

If the UE is configured with CSI-ReportConfig in which reportQuantity is set to'cri-RSRP' or'none', CSI-ResourceConfig (higher layer parameter resourcesForChannelMeasurement) for channel measurement does not include the higher layer parameter'trs-Info', When the higher layer parameter'repetition' includes the configured NZP-CSI-RS-ResourceSet, the UE of the same number having a higher layer parameter'nrofPorts' for all CSI-RS resources in the NZP-CSI-RS-ResourceSet It can only be configured as a port (1-port or 2-port).

(higher layer parameter) When repetition is set to'ON', it is related to the Rx beam sweeping procedure of the terminal. In this case, when the terminal receives the NZP-CSI-RS-ResourceSet, the terminal may assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same Tx beam. Here, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet may be transmitted in different OFDM symbols. In addition, the UE does not expect to receive different periods in periodicityAndOffset in all CSI-RS resources in the NZP-CSI-RS-Resourceset.

On the other hand, when Repetition is set to'OFF', it is related to the Tx beam sweeping procedure of the base station. In this case, when repetition is set to'OFF', the UE does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through different Tx beams.

FIG. 16(a) shows an Rx beam determination (or refinement) procedure of a terminal, and FIG. 16(b) shows a Tx beam sweeping procedure of a base station. In addition, FIG. 16(a) shows a case where the repetition parameter is set to'ON', and FIG. 16(b) shows a case where the repetition parameter is set to'OFF'.

Referring to FIGS. 16(a) and 17, a process of determining an Rx beam of a terminal will be described.

-The UE receives the NZP CSI-RS resource set IE including higher layer parameter repetition from the base station through RRC signaling (S1710). Here, the repetition parameter is set to'ON'.

-The UE repeatedly receives resource(s) in the CSI-RS resource set set to repetition'ON' in different OFDM symbols through the same Tx beam (or DL spatial domain transmission filter) of the base station (S1720).

-The terminal determines its own Rx beam (S1730).

-The UE omits the CSI report (S1740). In this case, the reportQuantity of the CSI report config may be set to'No report (or None)'.

That is, when the terminal is set to repetition'ON', the CSI report may be omitted.

Hereinafter, with reference to FIGS. 16(b) and 18, a process of determining a Tx beam of a base station will be described.

-The terminal receives the NZP CSI-RS resource set IE including the higher layer parameter repetition from the base station through RRC signaling (S1810). Here, the repetition parameter is set to'OFF', and is related to the Tx beam sweeping procedure of the base station.

-The terminal receives resources in the CSI-RS resource set set to repetition'OFF' through different Tx beams (DL spatial domain transmission filters) of the base station (S1820).

-The terminal selects (or determines) the best beam (S1830)

-The terminal reports the ID and related quality information (eg, L1-RSRP) for the selected beam to the base station (S1840). In this case, the reportQuantity of the CSI report config may be set to'CRI + L1-RSRP'.

That is, when the CSI-RS is transmitted for the BM, the UE reports the CRI and the L1-RSRP thereof to the base station.

That is, when repetition'ON' is set in the CSI-RS resource set, a plurality of CSI-RS resources are repeatedly used by applying the same transmission beam, and when repetition'OFF' is set in the CSI-RS resource set, different CSIs -RS resources can be seen to be transmitted in different transmission beams.

4.11.3. DL BM related beam indication

The UE may receive a list of up to M candidate transmission configuration indication (TCI) states for at least QCL (Quasi Co-location) indication purposes. Here, M may be 64.

Each TCI state can be set as one RS set. Each ID of a DL RS for spatial QCL purpose (QCL Type D) in at least an RS set may refer to one of DL RS types such as SSB, P-CSI RS, SP-CSI RS, and A-CSI RS. .

At least, initialization/update of the ID of the DL RS(s) in the RS set used for spatial QCL purposes may be performed through at least explicit signaling.

Table 19 shows an example of the TCI-State IE.

The TCI-State IE is associated with one or two DL reference signals (RS) corresponding quasi co-location (QCL) types.

In Table 19, the bwp-Id parameter indicates the DL BWP where the RS is located, the cell parameter indicates the carrier where the RS is located, and the reference signal parameter is a reference that is a source of quasi co-location for the target antenna port(s). It represents the antenna port(s) or a reference signal including it. The target antenna port(s) may be CSI-RS, PDCCH DMRS, or PDSCH DMRS. For example, in order to indicate QCL reference RS information for NZP CSI-RS, a corresponding TCI state ID may be indicated in NZP CSI-RS resource configuration information. As another example, in order to indicate QCL reference information for the PDCCH DMRS antenna port(s), a TCI state ID may be indicated in each CORESET setting. As another example, in order to indicate QCL reference information for the PDSCH DMRS antenna port(s), the TCI state ID may be indicated through DCI.

4.11.4. UL BM

In the UL BM, beam reciprocity (or beam correspondence) between Tx beam and Rx beam may or may not be established according to UE implementation. If reciprocity between the Tx beam and the Rx beam is established in both the base station and the terminal, a UL beam pair may be matched through a DL beam pair. However, when the reciprocity between the Tx beam and the Rx beam is not established at either of the base station and the terminal, a UL beam pair determination process is required separately from the DL beam pair determination.

In addition, even when both the base station and the terminal maintain beam correspondence, the base station can use the UL BM procedure to determine the DL Tx beam without requesting the terminal to report a preferred beam.

UL BM may be performed through beamformed UL SRS transmission, and whether to apply UL BM of the SRS resource set is set by (higher layer parameter) usage. When usage is set to'Beam Management (BM)', only one SRS resource may be transmitted to each of a plurality of SRS resource sets at a given time instant.

The terminal may receive one or more Sounding Reference Symbol (SRS) resource sets set by the (higher layer parameter) SRS-ResourceSet (through higher layer signaling, RRC signaling, etc.). For each SRS resource set, the UE may be configured with K≥1 SRS resources (higher later parameter SRS-resource). Here, K is a natural number, and the maximum value of K is indicated by SRS_capability.

Like the DL BM, the UL BM procedure can be divided into a Tx beam sweeping of a terminal and an Rx beam sweeping of a base station.

20 is a diagram illustrating an example of a UL BM procedure using an SRS applicable to the present disclosure. Figure 20 (a) shows the Rx beam determination procedure of the base station, Figure 20 (b) shows the Tx beam sweeping procedure of the terminal.

-The terminal receives RRC signaling (eg, SRS-Config IE) including a usage parameter set to'beam management' (higher layer parameter) from the base station (S2110).

Table 20 shows an example of an SRS-Config IE (Information Element), and the SRS-Config IE is used for SRS transmission configuration. The SRS-Config IE includes a list of SRS-Resources and a list of SRS-ResourceSets. Each SRS resource set means a set of SRS-resources.

The network can trigger the transmission of the SRS resource set using the configured aperiodicSRS-ResourceTrigger (L1 DCI).

In Table 20, usage indicates a higher layer parameter indicating whether the SRS resource set is used for beam management, codebook-based or non-codebook-based transmission. The usage parameter corresponds to the L1 parameter'SRS-SetUse'. 'spatialRelationInfo' is a parameter indicating the setting of the spatial relation between the reference RS and the target SRS. Here, the reference RS may be SSB, CSI-RS, or SRS corresponding to the L1 parameter'SRS-SpatialRelationInfo'. The usage is set for each SRS resource set.

-The terminal determines a Tx beam for the SRS resource to be transmitted based on the SRS-SpatialRelation Info included in the SRS-Config IE (S2120). Here, SRS-SpatialRelation Info is set for each SRS resource, and indicates whether to apply the same beam as the beam used in SSB, CSI-RS or SRS for each SRS resource. In addition, SRS-SpatialRelationInfo may or may not be set for each SRS resource.

-If the SRS-SpatialRelationInfo is set in the SRS resource, the same beam as the beam used in SSB, CSI-RS or SRS is applied and transmitted. However, if the SRS-SpatialRelationInfo is not set in the SRS resource, the terminal randomly determines the Tx beam and transmits the SRS through the determined Tx beam (S2130).

More specifically, for P-SRS in which'SRS-ResourceConfigType' is set to'periodic':

i) When SRS-SpatialRelationInfo is set to'SSB/PBCH', the UE applies the same spatial domain transmission filter (or generated from the filter) as the spatial domain Rx filter used for SSB/PBCH reception, and the corresponding SRS resource To transmit; or

ii) When SRS-SpatialRelationInfo is set to'CSI-RS', the UE transmits SRS resources by applying the same spatial domain transmission filter used for reception of periodic CSI-RS or SP CSI-RS; or

iii) When SRS-SpatialRelationInfo is set to'SRS', the UE transmits the SRS resource by applying the same spatial domain transmission filter used for transmission of periodic SRS.

Even when'SRS-ResourceConfigType' is set to'SP-SRS' or'AP-SRS', a beam determination and transmission operation may be applied similarly to the above.

-Additionally, the terminal may or may not receive feedback for the SRS from the base station as in the following three cases (S2140).

i) When Spatial_Relation_Info is set for all SRS resources in the SRS resource set, the UE transmits the SRS through a beam indicated by the base station. For example, if Spatial_Relation_Info all indicate the same SSB, CRI, or SRI, the UE repeatedly transmits the SRS with the same beam. In this case, it corresponds to FIG. 20(a) as a use for the base station to select an Rx beam.

ii) Spatial_Relation_Info may not be set for all SRS resources in the SRS resource set. In this case, the terminal can freely transmit while changing the SRS beam. That is, in this case, the UE sweeps the Tx beam and corresponds to FIG. 20(b).

iii) Spatial_Relation_Info can be set only for some SRS resources in the SRS resource set. In this case, for the configured SRS resource, the SRS is transmitted through the indicated beam, and for the SRS resource for which Spatial_Relation_Info is not configured, the terminal may arbitrarily apply and transmit a Tx beam.

4.12. 빔 회복 (Beam recovery) 절차4.12. Beam recovery procedure

When the terminal and the base station perform a DL/UL beam management process, a beam mismatch problem may occur according to a set beam management period.

In particular, when the wireless channel environment changes due to the location of the terminal, rotation, or movement of surrounding objects (e.g., from a line of sight (LoS) situation to a non-LoS situation by a beam block, etc.), the optimal DL /UL beam pair can be changed. To explain this change more generally, it is possible to respond to a situation in which a beam failure event has occurred due to a failure in tracking according to a beam management process performed by a network indication.

The terminal may determine whether such a beam failure event occurs through the reception quality of the downlink RS.

Subsequently, the UE may transmit a report message for this situation or a message for a beam recovery request (hereinafter referred to as a beam failure recovery request (BFRQ) message) to the base station (or network).

The base station may receive the corresponding message and perform beam recovery through various processes such as beam RS transmission and beam reporting request for beam recovery. This series of beam recovery processes may be referred to as beam failure recovery (BFR).

According to standard documents such as 3GPP TS 38.213 and 3GPP TS 38.321, the BFR process can be configured as follows.

(1) Beam failure detection (BFD)

When all PDCCH beams fall below a predetermined quality value (Q_out), the physical layer of the terminal declares one beam failure instance (declare).

Here, the quality of the beam is measured based on a hypothetical block error rate (BLER). In other words, the characteristics of the beam may be measured based on a probability that the UE fails to demodulate the corresponding information, assuming that control information is transmitted through the corresponding PDCCH.

For implicit configuration for the BFD RS, a plurality of search spaces to monitor the PDCCH to a specific terminal may be set. In this case, the beam (or resource) may be set differently for each search area. Therefore, the case in which all PDCCH beams fall below a predetermined quality value may mean a case in which the quality of all beams that can be set differently for each search area falls below the BLER threshold.

To this end, various methods of setting may be applied/set for the BFD reference signal (or BFD RS).

For example, an implicit setting method may be used for the BFD reference signal. As a specific example, a control resource set (CORESET [see TS 38.213, TS 38.214, TS 38.331)], which is a resource region through which a PDCCH can be transmitted, may be set in each search space. In addition, the base station may indicate/set to the terminal RS information (eg, CSI-RS resource ID, SSB ID) QCL in terms of spatial RX parameters for each CORESET ID. For example, the base station may indicate/set the QCL-dated RS to the UE through a transmit configuration information (TCI) indication.

Here, the base station instructs/sets the RS (i.e., QCL Type D in TS 38.214) QCL to the terminal in terms of the spatial RX parameter, when the terminal receives the PDCCH DMRS, the beam used for spatially QCLd RS reception. It may include indicating/setting that (or can use) should be used as it is. In other words, when the base station indicates/sets the RS (i.e., QCL Type D in TS 38.214) QCL in terms of spatial RX parameter to the terminal, the base station indicates the same transmission beam for spatially QCL antenna ports or It may include informing the UE that the transmission will be performed by applying a similar transmission beam (eg, when the beam direction is the same/similar and the beam width is different).

For explicit configuration for the BFD RS, the base station may explicitly set a specific RS (eg, beam RS(s)) for BFD use to the terminal. In this case, the specific RS may correspond to the'all PDCCH beams'.

For convenience of description below, a plurality of BFD RSs is defined as a BFD RS set.

Subsequently, when a beam failure instance occurs (consecutively) a predetermined number of times, the MAC (Media Access Control) layer of the terminal may declare a beam failure.

(2) New beam identification & selection

(2-1) Step 1

The UE may find a beam having a predetermined quality value (Q_in) or more among RSs set by the base station as a candidate beam RS set.

-If one beam RS exceeds a predetermined quality value (threshold), the terminal may select the corresponding beam RS.

-If a plurality of beam RSs exceed a predetermined quality value, the terminal may randomly select one beam RS from among the corresponding beam RSs.

-If there is no beam RS exceeding the predetermined quality value, the UE can perform Step 2 below.

In this case, in the above-described operation, the beam quality may be determined based on RSRP.

In the present disclosure, the RS beam set set by the base station may be configured as one of the following three cases.

-All of the beam RSs in the RS beam set are composed of SSBs

-All beam RSs in the RS beam set are composed of CSI-RS resources

-Beam RSs in the RS beam set are composed of SSBs and CSI-RS resources

(2-2) Step 2

The UE may find a beam having a predetermined quality value (Q_in) or more among SSBs (connected to contention based PRACH resources).

-If one SSB exceeds the predetermined quality value, the terminal can select the corresponding SSB.

-If a plurality of SSBs exceed a predetermined quality value, the UE may randomly select one SSB from among the corresponding SSBs.

-If there is no SSB exceeding the predetermined quality value, the terminal can perform Step 3 below.

(2-3) Step 3

The UE may select any SSB from among SSBs (connected to contention based PRACH resources).

(3) CFRA based BFRQ & monitoring gNB's response

In the present disclosure, the BFRQ (Beam Failure Recovery Request) refers to a PRACH resource and a PRACH preamble that are established directly or indirectly connected to the beam RS (eg, CSI-RS or SSB) selected by the terminal in the above-described process to the base station. May include. In other words, BFRQ may include transmitting a PRACH preamble related to a beam RS selected by the UE in the above-described process through a PRACH resource related to a beam RS selected by the UE.

In the present disclosure, a PRACH resource and a PRACH preamble that are directly connected can be used in the following cases.

-When contention-free PRACH resource and PRACH preamble are set for a specific RS in the candidate beam RS set separately configured for BFR use

-When a PRACH resource and a PRACH preamble mapped one-to-one with universally configured SSBs such as random access are set

Alternatively, the indirectly connected PRACH resource and PRACH preamble may be used in the following cases.

-When contention-free PRACH resource and PRACH preamble are not set for a specific CSI-RS in the candidate beam RS set separately configured for BFR use

--In this case, the UE is designated as capable of receiving with the same reception beam as the corresponding CSI-RS (for example, quasi-co-located (QCLed) with respect to spatial Rx parameter) (contention-free) PRACH resource and PRACH connected to the SSB. You can choose preamble.

For convenience of explanation, in the following description, the RSRQ based on the Contention-Free PRACH resource and the PRACH preamble is referred to as a Contention Free Random Access (CFRA) based RSRQ.

Based on the above-described configuration, the terminal transmits the PRACH preamble to the base station, and the terminal can monitor the response of the base station (eg, gNB) for the corresponding PRACH transmission.

At this time, the response signal for the contention-free PRACH resource and PRACH preamble may be transmitted through a PDCCH masked with a cell random network temporary identifier (C-RNTI). The PDCCH may be received on a search area separately (by RRC signaling) set for BFR use.

The search area can be set on a specific CORESET (for BFR).

In the present disclosure, a response signal for a contention based PRACH for BFR may reuse a CORESET (eg, CORESET 0 or CORESET 1) and a search area set for a random access process based on a contention based PRACH.

In the above-described configuration, if the terminal does not receive a response signal for a certain period of time, the terminal repeatedly performs the above-described new beam identification and selection process and the BFRQ & monitoring gNB's response process. can do.

In the present disclosure, the UE may perform the above process until (i) PRACH transmission reaches a preset maximum number of times (eg, N_max) or (ii) a separately set timer expires. In this case, when the timer expires, the terminal may stop contention free PRACH transmission. However, in the case of contention based PRACH transmission by SSB selection, the terminal may perform the PRACH until N_max reaches (regardless of whether the timer expires).

(4) CBRA based BFRQ & monitoring gNB's response

When the following cases occur, the UE may perform Contention Based Random Access (CBRA) based BFRQ.

-When the terminal fails in CFRA-based BFRQ. In this case, the UE may perform CBRA-based BFRQ as a subsequent operation.

-If CFRA is not defined in Active BWP

-When the CORESET associated with the upper layer parameter SearchSpace -BFR is not set or the upper layer parameter SearchSpace-BFR is not set

However, unlike the case of CFRA, for CBRA, the UE uses the PRACH resource used for uplink initial access, and thus collisions with other UEs may occur.

The beam failure detection and beam recovery procedures described above may be summarized as follows.

When a beam failure is detected on the serving SSB(s)/CSI-RS(s), it is used to indicate a new SSB or CSI-RS to a serving base station (e.g., serving gNB) for the MAC entity by RRC signaling. Beam failure procedure may be configured (The MAC entity may be configured by RRC with a beam failure recovery procedure which is used for indicating to the serving gNB of a new SSB or CSI-RS when beam failure is detected on the serving SSB ( s)/CSI-RS(s)). Beam failure may be detected by counting a beam failure instance indication from the lower layer to the MAC entity. For the beam failure detection and recovery procedure, the base station may set the following parameters in the upper layer parameter BeamFailureRecoveryConfig to the terminal through RRC signaling:

-BeamFailureInstanceMaxCount (for beam failure detection)

-BeamFailureDetectionTimer (for beam failure detection)

-BeamFailureRecoveryTimer (for beam failure recovery procedure)

-rsrp-ThresholdSSB . RSRP threshold for beam failure recovery

-powerRampingStep . PowerRampingStep parameter for beam failure recovery

-preambleReceivedTargetPower . PreambleReceivedTargetPower parameter for beam failure recovery

-preambleTransMax . PreambleTransMax parameter for beam failure recovery

-ra-ResponseWindow . Time window for monitoring response(s) for beam recovery procedure using contention-free Random Access Preamble

-prach-ConfigIndex . Prach-ConfigIndex parameter for beam failure recovery

-ra-ssb-OccasionMaskIndex . Ra-ssb-OccasionMaskIndex parameter for beam failure recovery

-ra-OccasionList. Ra-OccasionList parameter for beam failure recovery

The terminal may use the following parameters for the beam failure detection procedure:

-BFI_COUNTER . As a counter for beam failure instance indication, the initial value is set to 0

The MAC entity of the terminal may operate as follows.

1> When a beam failure instance indication is received from the lower layer(s):

2> Start or restart beamFailureDetectionTimer

2> Increase BFI_COUNTER by 1 (increment)

2> If BFI_COUNTER >= beamFailureInstanceMaxCount :

3> If the upper layer parameter beamFailureRecoveryConfig is set:

4> (if set) start beamFailureRecoveryTimer

4> SpCell (Special Cell, e.g.: Primary Cell in MCG (Macro Cell Group), or PSCell (Primary SCG Cell) in SCG (Secondary Cell Group) by applying the powerRampingStep, preambleReceivedTargetPower, and preambleTransMax parameters set in the upper layer parameter beamFailureRecoveryConfig . ) Initiate a random access procedure (initiate)

3> or:

4> Initiate random access procedure on SpCell

1> If beamFailureDetectionTimer has expired:

2> Set BFI_COUNTER to 0

1> If the random access procedure is successfully completed:

2> (if set) stop beamFailureRecoveryTimer (stop)

2> Considering that the beam failure recovery procedure has been completed successfully (consider)

Additionally, PCell, SCell, and serving cell according to the present disclosure may be defined as follows.

[1] Primary Cell (PCell)

As a cell operating on the primary frequency, the UE performs an initial connection establishment procedure or initiates a connection re-establishment procedure, or indicates a primary cell within a handover procedure. Cell

[2] Secondary Cell (SCell)

As a cell operating on a secondary frequency, a cell that can be configured when an RRC connection is established or a cell used to provide additional radio resources such as an additional carrier for carrier aggregation

In the present disclosure, contention based random access (CBRA) on SCell cannot be set. On the other hand, it may be allowed that CFRA (Contention Free Random Access) is set on the SCell.

[3] Serving Cell

For a UE in the RRC_CONNECTED state and for which CA is not configured, only one serving cell including PCell exists. For a UE in the RRC_CONNECTED state and in which CA is configured, the word'serving cells' means one or more sets including a PCell and all SCell(s).

Additionally, for the BFRQ for the DL-only SCell according to the present disclosure, the CBRA of the PCell may be used, or the CFRA for the SCell BFR (if there is a SCell UL) may be additionally used.

As an example for this, as a multi-beam based operation, an operation based on a PCell set in FR1 and a SCell set in FR2 may be considered.

In this case, even if a beam failure occurs for the SCell, the link quality of the PCell UL may be assumed to be good. Since SCell includes only DL CC (component carrier), it is possible to utilize MAC-CE in PCell as a simple solution for SCell BFR. In this case, the UE may transmit a Cell ID, a new beam RS ID, and the like through the PCell PUSCH. For a MAC-CE-based solution, the UE may need to transmit an SR (Scheduling Request) on the PUCCH. In order for the base station to promptly recognize the status of the terminal (e.g., whether the terminal requests a PUSCH for general data transmission or a PUSCH for BFR reporting, etc.), the terminal is an SR resource used only for BFRQ. It may be considered to allocate the SR resource dedicated to the (dedicated). Since this is a transmission initiated by the UE, in this case, the SR PUCCH format can be reused.

As another example, as a multi-beam based operation, the following items may be considered for beam failure recovery for a SCell configured as DL only or DL/UL in FR2. At this time, the PCell can operate within FR2 as well as FR1.

For SCell BFR, it can be assumed that the link quality of PCell DL/UL is good enough. If the PCell is in a beam failure state, prior to recovering the SCell beam, recovery of the PCell beam may be performed first through an existing BFR mechanism. To this end, a scheme in which only PCell UL is used for request/information related to SCell beam failure may be considered.

With regard to information delivered through the PCell UL, various options as follows may be considered.

Option 1: Occurrence of SCell beam failure

Option 2: Beam information for the occurrence and failure and/or survived beam(s) of SCell beam failure

When comparing Option 1 and Option 2, the additional effect/benefit of Option 2 may not be significant. Because, since the PCell is still maintained (alive), the base station may trigger a regular beam report on the PCell based on an existing (existing) beam reporting mechanism in order to obtain information for the SCell.

Accordingly, the terminal may report only the occurrence of a beam failure of the SCell through the PCell UL.

For the delivery of the information, the following three options can be considered.

Option 1: PRACH in PCell

Option 2: PUCCH in PCell

Option 3: PUSCH in PCell

Alternatively, when the SCell beam fails, the UE may report related information through a dedicated PUCCH resource of PUCCH format 0/1 on the PCell. Accordingly, a separate signal/message/procedure may not be defined for SCell BFR.

4.13. 대역폭 파트 (Bandwidth part, BWP)4.13. Bandwidth part (BWP)

The NR system can support up to 400 MHz per component carrier (CC). If the terminal operating in such a wideband CC always operates with the RF for the entire CC turned on, the terminal battery consumption may increase. Or, when considering several use cases (e.g., eMBB, URLLC, Mmtc, V2X, etc.) operating within one wideband CC, different numerology (e.g., sub-carrier spacing) for each frequency band within the CC may be supported. Alternatively, the capability for the maximum bandwidth may be different for each terminal. In consideration of this, the base station can instruct the terminal to operate only in a portion of the bandwidth rather than the entire bandwidth of the wideband CC, and the portion of the bandwidth is defined as a bandwidth part (BWP) for convenience. BWP can be composed of consecutive resource blocks (RBs) on the frequency axis, and one numerology (eg, sub-carrier spacing), cyclic prefix length (Cyclic Prefix) length, CP length), slot/mini-slot duration, etc.).

Meanwhile, the base station may set multiple BWPs even within one CC set for the terminal. For example, in a PDCCH monitoring slot, a BWP occupying a relatively small frequency domain is set, and a PDSCH indicated by the PDCCH may be scheduled on a larger BWP. And/or, when the terminals are concentrated in a specific BWP, some terminals may be set to switch to other BWPs for load balancing. And/or, in consideration of frequency domain inter-cell interference cancellation between neighboring cells, a partial region (ie, spectrum) of the total bandwidth may be excluded and both BWPs may be set within the same slot. That is, the base station may set at least one DL/UL BWP to the terminal associated with the wideband CC, and specifically, at least one DL/UL BWP among the DL/UL BWP(s) configured at a specific time (L1 signaling or MAC CE or RRC signaling, etc.). And/or, the base station may instruct the UE to switch to another configured DL/UL BWP (via L1 signaling or MAC CE or RRC signaling). And/or, based on a timer, a method of setting to switch to a predetermined DL/UL BWP when the value of the corresponding timer expires may also be considered.

In this case, the activated DL/UL BWP may be defined or referred to as an active DL/UL BWP. However, in situations such as when the terminal is in the initial access process or before the RRC connection is established (ie, set up), it may not be able to receive the configuration for the DL/UL BWP. have. In this case, the DL/UL BWP assumed by the UE may be defined or referred to as an initial active DL/UL BWP.

For example, if a specific field indicating BWP (e.g., BWP indicator field) is included in the DCI for scheduling of the PDSCH (e.g., DCI format 1_1), the value of the field is for DL reception for the terminal (in advance ) It can be set to indicate a specific DL BWP (eg, active DL BWP) among the set DL BWP sets. In this case, the terminal receiving the DCI may be configured to receive DL data in a specific DL BWP indicated by a corresponding field. And/or, when a specific field indicating BWP (eg, BWP indicator field) is included in DCI for scheduling of PUSCH (eg, DCI format 0_1), the value of the field is for UL transmission to the UE (in advance ) It may be set to indicate a specific UL BWP (eg, active UL BWP) among the set UL BWP sets. In this case, the terminal receiving the DCI may be configured to transmit UL data in a specific UL BWP indicated by a corresponding field.

5. 본 개시에 적용 가능한 단말 및 기지국의 동작 예5. Examples of operations of terminals and base stations applicable to the present disclosure

In the present disclosure, the term terminal may be replaced with a user equipment (UE).

In the present disclosure, the higher layer signaling may include radio resource control (RRC) signaling, MAC CE, and the like.

In the present disclosure, a transmission reception point (TRP) may be extended and applied to a beam/panel.

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

In the present disclosure, L1-SINR (layer 1-signal to interference and noise ratio) is L1-RSRQ (layer 1-reference signal received quality) or L1-RSRP (layer 1-reference signal received power) according to an embodiment. Can be extended.

In the present disclosure, beam quality may be extended to channel quality according to an embodiment.

In the present disclosure, NCR#X may mean NZ-CSI-RS-Resource #X. And, that the base station provides a service to UE#Y based on NCR#X means that (i) the base station transmits a PDSCH having the same or similar beam direction as that of NCR#X to UE#Y, or (ii) the This may mean that the base station transmits a PDSCH having a DMRS with NCR#X as a QCL source in terms of a spatial QCL parameter to UE#Y.

The following table shows the CSI-ReportConfig IE applicable to the present disclosure. In the following table, resourcesForChannelMeasurement, csi-IM-ResourcesForInterference, nzp-CSI-RS-ResourcesForInterference, respectively, are NZP CSI-RS (or SSB) for channel measurement, NZP CSI-RS (or SSB) for interference measurement, and interference It can correspond to the ZP CSI-RS for measurement.

In the present disclosure, the three parameters described above are, respectively, in order CMR (Channel Measurement Resource), NZP-based IMR (Non-Zero-Power CSI-RS-Resource based Interference Measurement Resource), and ZP-based IMR (Zero-Power CSI). -RS-Resource based Interference Measurement Resource).

Hereinafter, a method of setting the L1-SINR report for reporting the best or worst beam pair will be described in detail.

In FIG. 22, TRP#1 and TRP#2 may have the same cell ID.

In FIG. 22, the base station may configure the CMR and NZP-CSI-RS based IMR of ReportConfig to the terminal as shown in the following table. In the following table, 1, 2, and 3 may mean NZP-CSI-RS-Resource#1, #2, and #3, respectively.

As described above, NCR may mean NZP-CSI-RS-Resource. In addition, CMR, NZP-based IMR, and ZP-based IMR may mean a channel measurement resource, NZP CSI-RS-based IMR (Interference Measurement Resource), and ZP CSI-RS-based IMR, respectively. In addition, CMR, NZP based IMR, ZP based IMR, and NZP CSI-RS based IMR (#X) correspond to resourcesForChannelMeasurement, nzp-CSI-RS-ResourceForInterference, csi-iM-ResourceForInterference (#X) of CSI-ReportConfig IE, respectively. I can. In this case, CMR and IMR may each mean a resource for measuring reception power of a channel used by the base station to transmit a PDSCH to the terminal and a resource for measuring reception power of a channel acting as interference to the terminal.

The UE may calculate the L1-SINR as shown in Table 23 based on the CMR and NZP-CSI-RS-based IMR configuration of Table 22. At this time, CRI (CSI-RS resource indicator) may indicate the order of each combination (CMR, NZP based IMR) on a horizontal basis in Table 22.

As an example, based on Table 23, the UE may perform beam reporting (in the order of good performance, including CRI and L1-SINR for beam-related information with good performance/quality in terms of L1-SINR) as shown in the following equation. have.

In the above equation, CRI#2 may represent a beam in which NCR#1 is the best beam in terms of L1-SINR from a viewpoint of UE#1, and a beam that NCR#3 (best beam pair) minimizes interference. In this case, the base station serves one PDSCH having the same or similar beam direction as NCR#1 and another PDSCH having the same or similar beam direction as NCR#3 to UE#1/#2 in the same time/frequency resource (e.g. : MU (Multi User) paring) is possible.

In the above equation, CRI#4 may represent a beam in which NCR#2 is the second best beam from the viewpoint of L1-SINR from the viewpoint of UE#1, and the interference of NCR#3 is also not large. If the base station cannot service UE#1 using NCR#1, it can service UE#1 using NCR#2.

As another example, based on Table 23, as shown in the following equation (from the viewpoint of L1-SINR, the UE provides information related to a beam having good performance/quality and information related to a beam having poor performance/quality from the viewpoint of L1-SINR, CRI and L1-SINR. Beam reporting including) may be performed.

In the above equation, CRI#2 may represent a beam in which NCR#1 is the best beam in terms of L1-SINR from a viewpoint of UE#1, and NCR#3 is a beam that minimizes interference.

In the above equation, CRI#1 may represent a beam in which NCR#2 increases interference from the viewpoint of UE#1, greatly deteriorating L1-SINR. In this case, when the base station serves UE#1 as NCR#1, the base station may not serve NCR#2 to another UE in the same time/frequency resource. Alternatively, the base station may serve the UE by simultaneously using NCR#1 and NCR#2. (Example: CoMP (Coordinated Multi Point))

Based on Table 23, CRI#6 gives the worst L1-SINR, but CMR itself may be meaningless. Therefore, even if the terminal reports this, it may not be of great significance from the viewpoint of the base station. Meanwhile, the base station compares CRI#1 and CRI#2 to find that NCR#1 and NCR#2 are significant beams from a terminal perspective.

Based on the content reported by UE#1 through the above-described Reporting #1 and Reporting #2, the base station serves as the second best beam (Reporting#1) or the best beam in addition to the best beam from the viewpoint of UE#1. The beam that gives the greatest interference (Reporting#2) can be known. That is, the base station can obtain a degree of freedom for selecting a beam capable of serving UE#1 based on Reporting #1 (e.g., selecting among NCR#1 or NCR#2 related beams), based on Reporting #2 When serving UE#1 as NCR#1, it is also possible to know a beam (eg, NCR#2, worst beam pair) to be avoided at the same time.

In the present disclosure, when nrofReportedRS is greater than 1, as shown in the following table, the terminal reports the CRI having the largest RSRP to the base station, and whether to select one or more remaining CRIs may be determined according to the terminal implementation. .

In the present disclosure, the operation can be extended to the L1-SINR report of the terminal. As a specific example, whether the terminal will report any of the above-described Reporting #1 or #2 may be determined by the terminal implementation.

Or, as confirmed above, if the base station can instruct/configure to report any of Reporting #1 or #2 to the terminal, whether to obtain beam selection flexibility or to improve throughput from the viewpoint of the base station as a scheduler You can choose whether to do it. For example, if the terminal supports CoMP, the base station may improve throughput through Reporting #1 of the terminal. More specifically, the base station transmits one PDSCH in the direction of NZP-CSI-RS resource #1 through TRP#1, and the same time/frequency as the PDSCH in the direction of NZP-CSI-RS resource #2 through TRP#2 When another PDSCH is transmitted to the resource, the UE can obtain a throughput gain.

5.1. Example 1

(At the time of Beam reporting using L1-SINR) One CMR and one or more IMRs form one combination, and the CRI may be set to indicate one of a plurality of CMR and IMR combinations. In this case, the terminal can expect to receive setting/instruction (by a base station, etc.) at least one of the following two settings (eg, settings A and B). The configuration may be transmitted/configured/instructed/determined through higher layer signaling (eg, RRC and/or MAC-CE) and/or DCI between the base station and the terminal.

(Setting A) One or more of the beam quality (e.g., L1-RSRP or L1-SINR, the corresponding parameter can be set by the base station) in the highest order, or the number of CRIs set by a predetermined number or higher layer parameters and/ Or report the corresponding beam quality to the base station

(Setting B) CRI with the best beam quality (e.g., L1-RSRP or L1-SINR, the corresponding parameter can be set by the base station) and/or the corresponding beam quality to the base station. As an example, based on the configuration B, the terminal may report one or more CRIs and/or corresponding beam quality to the base station that have the same CMR as the selected CRI and provide the lowest beam quality. At this time, the CRI has the same CMR as the CRI with the best beam quality, but may have different IMRs. Through this, the base station can increase the new performance of the terminal by not setting the interfering beam to another UE in the same time/frequency resource.

In the present disclosure, CMR and IMR may be jointly encoded (eg, one CMR and one or more IMRs form a combination, etc.). In this case, CRI may be expressed as one of a plurality of combinations of CMR and IMR. Through this, the base station can accurately specify only the necessary combinations to the terminal (for scheduling, etc.) (e.g., when the base station specifies unnecessary combinations, unnecessary complexity may be caused to the terminal). In response to this, the terminal may simply report the combination(s) useful to the base station through CRI (eg, hereinafter, Examples 1 to 3). Additionally, the operation according to the present disclosure is not limited to the UE reporting a combination of CMR and IMR, and may be extended and applied to the UE separately reporting CMR and IMR (Example: Example 4). Hereinafter, each embodiment will be described in detail.

In the present disclosure, the base station may indicate/set one of (i) configuration A, (ii) configuration B, and (iii) configuration A+B to the terminal based on RRC and/or MAC-CE and/or DCI. . At this time, setting A+B means a case in which setting A and setting B are simultaneously set in the terminal, and Embodiment 2 shows an example related thereto.

In the present disclosure, based on the higher layer parameter reportQuantity defined by the Rel-15 standard, setting A and setting B may be expressed as shown in the following table. Meanwhile, SSB may be used as CMR instead of NZP-CSI-RS-Resource. In this case, instead of cri-L1-SINR, ssb-index-L1-SINR may be used.

In the present disclosure, when the base station indicates/sets one of L1-RSRP or L1-SINR as beam quality to the terminal, the following method may be considered. As an example, the base station adds cri-SINR in addition to cri-RSRP in ReportQunatity defined by the Rel-15 standard and indicates/sets this to the terminal, so that the beam pool quality to be reported by the terminal is L1-RSRP or L1-SINR. Can be indicated/set.

5.1.1. Example 1

In the present disclosure, the base station may set whether to report to the terminal according to which of configuration A and configuration B.

For example, when the base station instructs/configures setting A to the terminal, the terminal may report beam information in the order of the best beam quality. Referring to the above-described example, the terminal may report the same content as Reporting #1 to the base station.

As another example, when the base station instructs/configures setting B to the terminal, the terminal may report beam information having the best quality and beam information having the worst quality in relation to the CMR of the best beam to the base station together. I can. For example, the report may be configured as in Reporting #2. In Reporting #2, the reason why CRI#1 rather than CRI#3 is selected is that the CMR of CRI#1 is the same as the CMR (NCR#1) of CRI#2, which provides the best beam quality. In addition, this is because, when the base station provides a service to the terminal using NCR#1, the base station may not provide a service using the NCR#2 in the same time/frequency resource.

5.1.2. Example 2

When the number of nrofReportedRS (eg, the number of CRIs to be reported by the terminal) is set to 3, the base station may be configured to report both configuration A & configuration B to the terminal. In this case, the above configuration may be performed based on higher layer signaling and/or DCI. In this case, the terminal may report information such as the following equation to the base station. Through this, the base station can take advantage of both Reporting #1 and #2.

Alternatively, when the number of nrofReportedRS is set to 3, the base station may be configured to report setting A to the terminal. In this case, the terminal may report to the base station as shown in the following equation. At this time, the following report content may be composed of the same content as when setting A & B is set. This is because CRI#1 provides the third best beam quality.

Alternatively, when the number of nrofReportedRS is set to 3, the base station may be configured to report on setting B to the terminal.

5.1.3. Example 3

When the number of nrofReportedRS is set to 4, the base station may be configured to report both configuration A & configuration B to the terminal. In this case, unlike the second embodiment, the content that the terminal reports to the base station may additionally include CRI#3. Through the above report, the UE can additionally inform the base station of NCR#1, which lowers the beam quality when CRI#3 has the same CMR as CRI#4 (e.g., NCR#2), and when paired with NCR#2. have.

5.1.4. Example 4

According to this embodiment, the UE may separately report CMR and/or IMR other than CRI. If the base station configures/instructs the terminal to report on setting B, and configures/instructs the L1-SINR report, the terminal may report the content as shown in the following equation.

Here, IMR#2 may indicate that the CMR indicated by CRI#2 (eg, NCR#1) causes the greatest interference in service to the UE. Additionally, when the base station configures/instructs the terminal to report on configuration A & configuration B, the terminal may report to the base station as follows.

Here, CRI#4 and IMR#1 added compared to Reporting #A are the CRI that provides the second best L1-SINR, respectively, and the greatest interference when providing services to the UE through the CMR indicated by the CRI. IMR that causes

5.2. Second operation example

It is assumed that the base station configures (i) NZP-CSI-RS based IMR with 2 ports and (ii) configures/instructs the L1-SINR report to the terminal. In this case, the terminal may be configured to calculate the interference power by measuring the power of each port and then averaging the power. In this embodiment, the above setting/instruction may be performed based on higher layer signaling and/or DCI.

In this embodiment, NZP-CSI-RS based IMR with 2 ports may be configured as shown in the following table. As shown in the following table, NZP-CSI-RS-Resource IE may include CSI-RS-ResourceMapping IE, and ResourceMapping IE may include nrofPorts. In this case, the base station may set/instruct the UE to set NZP-CSI-RS based IMR with 2 ports by setting the nrofPorts to 2.

More specifically, in the case of NZP-CSI-RS based IMR with 2 ports, the UE may calculate the interference power by measuring the power in each port and summing it. This is because each port corresponds to a different interference layer 1:1. However, in the case of L1-SINR, it is necessary to measure the reception power in one resource. Even for 2 ports, the terminal needs to calculate the interference power by measuring the power of each port and then averaging it. In this case, the power gain can be obtained compared to the case of 1 port. For example, it is possible to improve 3dB performance (eg, interference performance improvement, etc.) compared to the existing method.

5.3. Third operation example

When CMR and IMR are set to the same ID (or if IMR is set to null or void, etc.), and L1-SINR report is set/instructed to the UE, the UE measures interference using CMR and L1-SINR Can be set to calculate.

More specifically, it is assumed that the base station configures the CMR and NZP-CSI-RS based IMR of ReportConfig to the terminal. In this case, the terminal may report content as shown in the following table. At this time, the first CRI may have the same CMR and IMR. In this case, the terminal may be configured to measure a desired channel and interference using CMR. Specifically, the terminal may estimate the requested channel and calculate the interference power from the remaining signal after removing the estimated signal/channel from the received signal.

5.4. 4th operation example

It is assumed that one CMR is mapped to one or more IMRs, and L1-SINR reporting is indicated/configured to the UE. In this case, the terminal may be defined/configured to calculate the final interference power by measuring the interference power from each IMR and then adding them all. As an example, in FIG. 22, the base station and the terminal need to calculate the L1-SINR in case of receiving interference from NCR#2 and #3 while receiving service through a beam in the direction of NCR#1 from the viewpoint of UE#1. I can.

5.4.1. Example 1

In this embodiment, the base station may configure the CMR and NZP-CSI-RS based IMR#1/#2 of ReportConfig to the terminal. In this case, the desired (desired) channel power and interference power according to the CRI may be configured as shown in the following table.

In the case of CRI#1, the terminal may calculate the desired channel power and interference power from NCR#1.

In the case of CRI#2, the terminal may calculate the power of the desired channel and the first interference power from NCR#1. In addition, after measuring the second interference power from NCR#2, the terminal may calculate the final interference power by adding the first interference power.

In the case of CRI#3, the terminal may calculate the power of the desired channel and the first interference power from NCR#1. In addition, after measuring the second interference power from NCR#3, the terminal may calculate a final interference power by adding the first interference power.

In the case of CRI#4, the terminal can calculate the power of the desired channel from NCR#1. In addition, the terminal may calculate the final interference power by measuring the first/second interference power from NCR#2/#3, respectively, and then adding them.

Meanwhile, the setting may be extended and applied as shown in the following table.

5.4.2. Example 2

The figure below shows an example in which the base station configures the CMR of ReportConfig, NZP-CSI-RS based IMR#1/#2, and ZP based IMR to the UE. In this case, the desired channel power and interference power according to CRI are as follows.

In the case of CRI#1, the UE may calculate the power of the desired channel from NCR#1 and calculate the interference power from ZP based IMR.

In the case of CRI#2, the terminal may calculate the power of the desired channel from NCR#1 and calculate the first interference power from the ZP based IMR. In addition, after measuring the second interference power from NCR#2, the terminal may calculate a final interference power obtained by adding the first interference power and the second interference power.

In the case of CRI#3, the terminal may calculate the power of the desired channel from NCR#1 and calculate the first interference power from the ZP based IMR. In addition, after measuring the second interference power from NCR#3, the terminal may calculate a final interference power obtained by adding the first interference power and the second interference power.

In the case of CRI#4, the terminal may calculate the power of the desired channel from NCR#1 and calculate the first interference power from the ZP based IMR. In addition, the terminal may measure the second/third interference power from NCR#2/#3, respectively, and then calculate the final interference power obtained by adding all the first to third interference powers.

Meanwhile, the above-described settings may be extended and applied to the settings shown in the following table.

In the present disclosure, the following RRC parameters may be set based on the above-described settings. As an example, each of CSI-ReportConfig, CSI-ResourceConfigId#100, CSI-ResourceConfigId#110, and CSI-ResourceConfigId#104 may be set as shown in the following tables.

23 is merely for convenience of description, and does not limit the scope of the technology disclosed in this document. The base station (eg, BS) in FIG. 23 may mean a network side (eg, a transmission reception point (TRP), a TRP group, etc.). The beam management described in FIG. 23 may be related to CSI-RS based DL BM (eg, DL BM using CSI-RS, etc.).

The terminal may receive CSI configuration information related to beam management from the base station (S2310). As an example, as described above, the UE provides configuration information related to CSI reporting (eg, RRC IE'CSI Reporting Setting','CSI-ReportConfig','CSI-' through higher layer signaling (eg, RRC signaling) from the base station. MeasConfig','CSI-ResourceConfig', etc.) can be received.

As a specific example, the CSI configuration is resource-related configuration (e.g., CMR, NZP-CSI-RS based IMR, etc.), reporting configuration (e.g., CRI) in the method described above in the present invention (e.g., first to fourth operation examples) , L1-SINR, IMR, etc.).

Thereafter, the terminal may receive at least one CSI-RS from the base station (S2320), and based on the received CSI-RS, the terminal may determine/calculate the beam pair(s) and/or CSI ( S2330). For example, the UE may calculate CSI based on CSI-related information (eg, CSI configuration, etc.) transmitted through higher layer signaling and/or DCI, and a predefined rule.

Regarding the beam pair(s) determination, the terminal may determine the worst (worst) beam pair(s) and/or best (best) beam pair(s) based on the methods described in the first to fourth operation examples described above. ) And so on. For example, the terminal may determine the beam pair(s) to be reported to the BS according to the method(s) described in Embodiments 1 to 4 in consideration of the above-described configuration A and/or configuration B.

In particular, with regard to the determination/calculation of L1-SINR, the terminal may perform channel estimation, interference measurement, and the like using the methods described in the first to fourth operation examples described above. For example, when NZP-CSI-RS based IMR with 2 ports is configured and the L1-SINR report is instructed to the UE, the UE may be configured to measure the power of each port and average it to calculate the interference power. have. And/or, when CMR and IMR are set to the same ID (or IMR is set to null or void), and L1-SINR report is instructed to the terminal, the terminal measures interference using CMR and L1-SINR It can also be set to calculate. And/or, when one CMR is mapped to one or more IMRs, and L1-SINR report is instructed to the UE, the UE measures the interference power from each IMR, and then adds all these to calculate the final interference power. It can also be set.

Thereafter, the UE may report the determined CSI to the BS (S2340). For example, the terminal may perform CSI reporting based on the scheme proposed in the above-described first operation example (eg, Examples 1 to 4). Specifically, the CSI report may include one or more CRI and/or L1-SINR and/or IMR.

In this case, the CSI may be reported through the PUSCH. In this case, the UE may receive a DCI (eg, UL DCI) for scheduling a corresponding PUSCH from the base station. Here, the DCI for scheduling the PUSCH may include information indicating the BWP to be used by the UE for PUSCH transmission. That is, the base station may indicate or set the BWP (ie, active BWP) to be used by the UE for PUSCH transmission through DCI. For example, the DCI may include a field indicating a specific UL BWP (ie, active UL BWP). In this case, the terminal receiving the DCI may be configured to perform PUSCH based CSI reporting in the active UL BWP indicated by the DCI.

In this regard, the operation of the terminal and/or BS may be implemented by various devices described in the present disclosure. As a specific example, the processor of the terminal can control to perform CSI configuration reception, CSI-RS reception, and/or CSI reporting through the RF unit, and can control to determine beam pair(s) / CSI, and transmit/receive It can be controlled to store information, etc. in memory. In addition, the processor of the BS may control to perform CSI configuration transmission, CSI-RS transmission, and/or CSI report reception through the RF unit, and may control to store transmitted/received information in a memory.

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

In an NR system, a physical channel and a reference signal may be transmitted using beam-forming. When beam-forming-based signal transmission is supported, a beam-management process may be involved in order to align beams between the base station and the terminal. In addition, 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, in the RRC CONNECTED mode, beam alignment may be performed based on CSI-RS (in DL) and SRS (in UL). Meanwhile, when beam-forming-based signal transmission is not supported, an operation related to a beam may be omitted in the following description.

Referring to FIG. 24, a base station (eg, BS) may periodically transmit an SSB (S2402). Here, SSB includes PSS/SSS/PBCH. SSB can be transmitted using beam sweeping. Thereafter, the base station may transmit Remaining Minimum System Information (RMSI) and Other System Information (OSI) (S2404). The RMSI may include information (eg, PRACH configuration information) necessary for the terminal to initially access the base station. Meanwhile, after performing SSB detection, the UE identifies the best SSB. Thereafter, the terminal may transmit a RACH preamble (Message 1, Msg1) to the base station by using the PRACH resource linked/corresponding to the index (ie, the beam) of the best SSB (S2406). The beam direction of the RACH preamble is associated with the PRACH resource. The association between the PRACH resource (and/or the RACH preamble) and the SSB (index) may be set through system information (eg, RMSI). Thereafter, as part of the RACH process, the base station transmits a RAR (Random Access Response) (Msg2) in response to the RACH preamble (S2408), and the UE uses the UL grant in the RAR to send Msg3 (eg, RRC Connection Request). After transmitting (S2410), the base station may transmit a contention resolution message (Msg4) (S2412). Msg4 may include RRC Connection Setup.

When an RRC connection is established between the base station and the terminal 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 an SSB/CSI-RS (S2414). SSB/CSI-RS may be used by the UE to generate a beam/CSI report. Meanwhile, the base station may request a beam/CSI report from the terminal through DCI (S2416). 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 (S2418). The beam/CSI report may include a beam measurement result, information on a preferred beam, and the like. The base station and the terminal may switch the beam based on the beam/CSI report (S2420a, S2420b).

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

25 is a diagram briefly showing a DRX (Discontinuous Reception) cycle of a terminal applicable to the present disclosure. In Figure 25, the terminal may be in the RRC_CONNECTED state.

In this document, the terminal may perform the DRX operation while performing the procedures and/or methods described/suggested above. A terminal in which DRX is configured can reduce power consumption by discontinuously receiving DL signals. DRX may be performed in Radio Resource Control (RRC)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. In the RRC_IDLE state and RRC_INACTIVE state, the DRX is used to receive paging signals discontinuously. Hereinafter, DRX performed in the RRC_CONNECTED state will be described (RRC_CONNECTED DRX).

Referring to FIG. 25, a DRX cycle consists of On Duration and Opportunity for DRX. The DRX cycle defines a time interval in which On Duration is periodically repeated. On Duration represents a time period during which the UE monitors to receive the PDCCH. When DRX is configured, the UE performs PDCCH monitoring during On Duration. If there is a PDCCH successfully detected during PDCCH monitoring, the UE operates an inactivity timer and maintains an awake state. On the other hand, if there is no PDCCH successfully detected during PDCCH monitoring, the terminal enters a sleep state after the On Duration is over. Accordingly, when DRX is configured, PDCCH monitoring/reception may be discontinuously performed in the time domain in performing the procedure and/or method described/proposed above. For example, when DRX is set, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) in the present disclosure may be set discontinuously according to the DRX configuration. On the other hand, when DRX is not set, PDCCH monitoring/reception may be continuously performed in the time domain in performing the procedures and/or methods described/proposed above. For example, when DRX is not set, a PDCCH reception opportunity (eg, a slot having a PDCCH search space) may be continuously set in the present disclosure. Meanwhile, regardless of whether or not DRX is set, PDCCH monitoring may be restricted in a time period set as a measurement gap.

Table 37 shows the process of the terminal related to the DRX (RRC_CONNECTED state). Referring to Table 37, DRX configuration information is received through higher layer (eg, RRC) signaling, and whether DRX ON/OFF is controlled by a DRX command of the MAC layer. When DRX is configured, the UE may perform PDCCH monitoring discontinuously in performing the procedure and/or method described/suggested in the present disclosure, as illustrated in FIG. 25.

Here, the MAC-CellGroupConfig includes configuration information required to set a medium access control (MAC) parameter for a cell group. MAC-CellGroupConfig may also include configuration information about DRX. For example, MAC-CellGroupConfig defines DRX, and may include information as follows.

-Value of drx-OnDurationTimer: Defines the length of the start section of the DRX cycle

-Value of drx-InactivityTimer: Defines the length of the time interval in which the UE is awake after the PDCCH opportunity in which the PDCCH indicating initial UL or DL data is detected

-Value of drx-HARQ-RTT-TimerDL: Defines the length of the maximum time interval from receiving the initial DL transmission until the DL retransmission is received.

-Value of drx-HARQ-RTT-TimerDL: After the grant for initial UL transmission is received, the length of the maximum time interval until the grant for UL retransmission is received is defined.

-drx-LongCycleStartOffset: Defines the time length and start point of the DRX cycle

-drx-ShortCycle (optional): Defines the time length of the short DRX cycle

Here, if any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is in operation, the UE performs PDCCH monitoring at every PDCCH opportunity while maintaining the awake state.

The base station (or network) may transmit configuration information related to beam management (BM) to the terminal (S2610 and S2810). In response to this, the terminal may receive configuration information related to the BM from the base station (S2610 and S2710).

In the present disclosure, the setting information may include at least one of the following.

-First report setting information configured to report beam quality information related to a certain number of beams in order from the first beam having the highest beam quality

-(i) first beam quality information related to the first beam having the highest beam quality and (ii) a second beam having the same channel measurement resource (CMR) as the first beam and having the lowest beam quality Second report setting information for setting to report second beam quality information related to

In the present disclosure, the configuration information may include (i) CMR information related to each beam, and (ii) interference measurement resource (IMR) information related to each beam.

In the present disclosure, the configuration information may be transmitted through at least one or more of higher layer signaling or downlink control information (DCI). Alternatively, the configuration information may be transmitted based on a combination of higher layer signaling and DCI.

Subsequently, the terminal may receive the reference signal(s) from the base station (S2620, S2720). In response to this, the base station may transmit the reference signal(s) to the terminal (S2620 and S2820).

The terminal may receive control information related to scheduling (i) an active uplink bandwidth part (BWP) and (ii) a physical uplink shared channel (PUSCH) from the base station. (S2630, S2730). For example, the control information may include DCI. In the present disclosure, the control information may be received prior to, concurrently, or following the above-described setting information, reference signal, or the like, depending on the embodiment. In response to this, the base station may transmit the control information to the terminal (S2630 and S2830).

The terminal may determine the beam quality information from the received reference signal based on the configuration information (S2640, S2740). Subsequently, the terminal may report channel state information (CSI) including the beam quality information to the base station through the scheduled PUSCH in the active uplink BWP determined based on control information (S2650, S2750). Correspondingly, the base station may receive the CSI from the terminal through the scheduled BWP in the active uplink BWP (S2650, S2840).

In the present disclosure, the beam quality information may include one of the following.

-Reference signal received power (RSRP) information related to each beam

-Signal to interference plus noise ratio (SINR) information related to each reported beam

In the present disclosure, based on the setting information including (i) information on the number of reference signals reported by the terminal set to N and (ii) the first report setting information, the channel state information is (i) the first 1 beam quality information, and (ii) third beam quality information related to N-1 third beams having a higher beam quality after the first beam. In this case, N may be a natural number of 2 or more.

In the present disclosure, based on the setting information including (i) information on the number of reference signals reported by the terminal set to 3, (ii) the first report setting information and (iii) the second report setting information, The channel state information includes (i) the first beam quality information, (ii) the second beam quality information related to the second beam having the same CMR as the first beam and having the lowest beam quality, and (iii) the After the first beam, third beam quality information related to a third beam having the highest beam quality may be included.

In the present disclosure, the UE and the base station may perform the aforementioned CSI transmission/reception operation based on the aforementioned initial access or random access, DRX configuration, and the like.

It is obvious that examples of the above-described proposed method may also be included as one of the implementation methods of the present disclosure, and thus may be regarded as a kind of proposed method. In addition, the above-described proposed schemes may be implemented independently, but may be implemented in the form of a combination (or merge) of some proposed schemes. As for the information on whether to apply the proposed methods (or information on the rules of the proposed methods), a rule can be defined so that the base station informs the UE through a predefined signal (eg, a physical layer signal or a higher layer signal). have.

The present disclosure may be embodied in other specific forms without departing from the technical idea and essential features described in the present disclosure. Therefore, the detailed description above should not be construed as restrictive in all respects and should be considered as illustrative. The scope of the present disclosure should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present disclosure are included in the scope of this disclosure. In addition, the embodiments may be configured by combining claims that do not have an explicit citation relationship in the claims, or may be included as new claims 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 is a 3rd Generation Partnership Project (3GPP) or a 3GPP2 system. Embodiments of the present disclosure can be applied not only to the various wireless access systems, but also to all technical fields to which the various wireless access systems are applied. Furthermore, the proposed method can be applied to a mmWave communication system using an ultra-high frequency band.

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

Claims

In a method for a terminal to report channel state information (CSI) in a wireless communication system,

From the base station, receiving configuration information related to beam management (BM),

The above setting information,

First report setting information configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality, or,

(i) first beam quality information related to the first beam having the highest beam quality, and (ii) a second beam having the same channel measurement resource (CMR) as the first beam and having the lowest beam quality, and Including at least one of second report setting information configured to report related second beam quality information;

(I) an active uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) scheduling control information is received from the base station; And

Based on the configuration information and the control information, comprising reporting the channel state information including beam quality information determined from a received reference signal to the base station through the scheduled PUSCH in the active uplink BWP How to report channel status information.
The method of claim 1,

The above setting information,

Higher layer signaling, or,

A method of reporting channel state information of a terminal, received through at least one or more of downlink control information (DCI).
The method of claim 1,

The beam quality information,

Reference signal received power (RSRP) information related to each beam, or,

Signal to interference plus noise ratio (SINR) information related to each of the reported beams,

Including at least one or more of, the method for reporting channel state information of the terminal.
The method of claim 3,

Based on the reporting content configuration information included in the configuration information, the beam quality information includes at least one of RSRP information related to each of the reporting beams or SINR information related to each of the reporting beams. How to report status information.
The method of claim 1,

The above setting information,

CMR information related to each beam, and

A method for reporting channel state information of a terminal, including interference measurement resource (IMR) information related to each beam.
The method of claim 1,

Based on the setting information including (i) the number of reference signals reported by the terminal set to N and (ii) the first report setting information, the channel state information,

(i) the first beam quality information, and

(ii) including third beam quality information related to N-1 third beams having a higher beam quality after the first beam,

N is a natural number of 2 or more, the method for reporting channel state information of the terminal.
The method of claim 1,

Based on the setting information including (i) the number of reference signals reported by the terminal set to 3, (ii) the first report setting information, and (iii) the second report setting information, the channel state information is ,

(i) the first beam quality information,

(ii) the second beam quality information related to the second beam having the same CMR as the first beam and having the lowest beam quality, and

(iii) A method for reporting channel state information of a terminal including third beam quality information related to a third beam having the highest beam quality after the first beam.
The method of claim 1,

Based on the beam quality information including signal to interference plus noise ratio (SINR) information related to each of the reported beams, SINR information related to each of the reported beams is A method for reporting channel state information of a terminal, which is calculated based on interference power determined by averaging the power of one or more ports for related interference measurement resource (IMR).
The method of claim 1,

Based on the beam quality information including signal to interference plus noise ratio (SINR) information associated with each beam to be reported,

When the CMR and the interference measurement resource (IMR) related to a specific beam have the same identification information or the IMR related to the specific beam is not set, the SINR information related to the specific beam is included in the CMR related to the specific beam. A method for reporting channel state information of a terminal, calculated based on interference power determined based on.
The method of claim 1,

(i) the beam quality information including signal to interference plus noise ratio (SINR) information related to each of the reported beams, and (ii) one or more interference measurement resources with respect to a specific beam. measurement resource; based on the CMR associated with (IMR),

SINR information related to the specific beam is calculated based on the interference power determined by averaging the interference power from the one or more IMRs related to the CMR.
The method of claim 1,

Based on the beam quality information including signal to interference plus noise ratio (SINR) information associated with each beam to be reported,

The channel state information further includes CMR information and interference measurement resource (IMR) information related to each beam to be reported.
The method of claim 1,

The reference signal is,

Channel state information reference signal (CSI-RS), or,

Synchronization signal physical broadcast channel block (synchronization signal physical broadcast channel block; SS / PBCH block or SSB), comprising at least one or more of, the channel state information reporting method of the terminal.
In the terminal reporting channel state information (CSI) in a wireless communication system,

At least one transmitter;

At least one receiver;

At least one processor; And

And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed,

The specific action is:

From the base station, receiving configuration information related to beam management (BM),

The above setting information,

First report setting information configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality, or,

(i) first beam quality information related to the first beam having the highest beam quality, and (ii) a second beam having the same channel measurement resource (CMR) as the first beam and having the lowest beam quality, and Including at least one of second report setting information configured to report related second beam quality information;

(I) an active uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) scheduling control information is received from the base station; And

And reporting the channel state information including beam quality information determined from a received reference signal to the base station through the scheduled PUSCH in the active uplink BWP based on the configuration information and the control information.
The method of claim 13,

The terminal communicates with at least one of a mobile terminal, a network, and an autonomous vehicle other than a vehicle including the terminal.
In a base station for receiving channel state information (CSI) from a terminal in a wireless communication system,

At least one transmitter;

At least one receiver;

At least one processor; And

And at least one memory that is operatively connected to the at least one processor and stores instructions for causing the at least one processor to perform a specific operation when executed,

The specific action is:

To the terminal, transmitting configuration information related to beam management (BM),

The above setting information,

First report setting information configured to report beam quality information related to a predetermined number of beams in order from the first beam having the highest beam quality, or,

(i) first beam quality information related to the first beam having the highest beam quality, and (ii) a second beam having the same channel measurement resource (CMR) as the first beam and having the lowest beam quality, and Including at least one of second report setting information configured to report related second beam quality information;

Transmitting a reference signal to the terminal;

(I) an active (active) uplink bandwidth part (BWP) and (ii) physical uplink shared channel (PUSCH) transmitting control information related to scheduling; And

Receiving, from the terminal, the channel state information including beam quality information determined based on the configuration information and the reference signal through the scheduled PUSCH in the active uplink BWP.