Method and apparatus for reporting channel state information in a wireless communication system

Abstract

A method performed by a terminal in a wireless communication system includes: receiving configuration information associated with a channel state information (CSI) report from a base station, the configuration information including at least one information associated with a CSI resource setting; receiving information associated with a channel occupancy duration from the base station; determining whether at least one symbol for receiving a channel state information reference signal (CSI-RS) is within the channel occupancy duration based on the at least one information associated with the CSI resource setting and the received information associated with the channel occupancy duration; receiving at least one CSI-RS from the base station on at least one symbol based on a result of the determination; and when determining to send a CSI report, sending the CSI report to the base station based on the configuration information associated with the CSI report and the received at least one CSI-RS.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and apparatus for reporting channel state information in a wireless communication system. Background Art

[0002] In order to meet the growing demand for wireless data traffic after the commercialization of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) communication systems or quasi-5G communication systems. For this reason, 5G communication systems or quasi-5G communication systems are also referred to as super 4G network communication systems or post-long term evolution (LTE) systems. In order to achieve higher data transmission rates, it is considered to implement 5G communication systems in ultra-high frequency bands (millimeter waves (mmWave)) such as 60 gigahertz (GHz). In 5G communication systems, beamforming, large-scale multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming and large-scale antenna technology have been discussed as a way to reduce the propagation path loss of radio waves in ultra-high frequency bands and increase the propagation distance of radio waves. For the improvement of the system network, in the 5G communication system, technologies such as evolved small cells, advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), and interference elimination have been developed. In addition, for the 5G system, other technologies such as hybrid frequency shift keying (FSK) with quadrature amplitude modulation (QAM) (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM) schemes, and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access schemes have been developed.

[0003] The Internet is a human-centered connectivity network in which humans generate and consume information, which is now evolving into the Internet of Things (IoT) in which distributed entities such as objects exchange and process information. The Internet of Everything (IoE) has also emerged, which is a combination of IoT technology and big data processing technology achieved by connecting with cloud servers, etc. In order to realize the IoT, various technical elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology are required, and technologies related to sensor networks for connecting objects, machine-to-machine (M2M), machine type communication (MTC), etc. have been studied recently. This IoT environment can provide intelligent Internet technology (IT) services that create new value for human life by collecting and analyzing data generated between connected objects. Through the integration and combination between existing IT and various industries, IoT can be applied to multiple fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart home appliances, advanced medical services, etc.

[0004] Therefore, various attempts have been made to apply 5G communication systems to IoT networks. For example, 5G communication technologies such as sensor networks, M2M, MTC, etc. have been implemented through schemes such as beamforming, MIMO, and array antennas. The application of cloud RAN as a big data processing technology can also be an example of the fusion of 3eG technology and IoT technology.

[0005] As described above, with the development of wireless communication systems, various services can be provided, and therefore, a method for smoothly providing such services is needed. Specifically, in order to provide services to users over a long period of time, a communication method for saving power of a terminal and a method for reporting channel state information based on the communication method are needed. Summary of the invention

[0006] Solution to the problem

[0007] The present disclosure provides a communication method for saving power of a terminal, and a method and apparatus for reporting channel state information based on a communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

[0009] Figure 1 The basic structure of the time-frequency domain as a resource domain of a wireless communication system according to an embodiment of the present disclosure is shown;

[0010] Figure 2A diagram for describing a frame, subframe, and slot structure of a wireless communication system according to an embodiment of the present disclosure is shown;

[0011] Figure 3 A diagram for describing an example of bandwidth sections in a wireless communication system according to an embodiment of the present disclosure is shown;

[0012] Figure 4 A diagram is shown for describing a control region (control resource set (CORESET)) of a downlink control channel of a wireless communication system according to an embodiment of the present disclosure;

[0013] Figure 5 A diagram for describing the structure of a downlink control channel of a wireless communication system according to an embodiment of the present disclosure is shown;

[0014] Figure 6 An example of frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure is shown;

[0015] Figure 7 An example of time domain resource allocation of a PDSCH in a wireless communication system according to an embodiment of the present disclosure is shown;

[0016] Figure 8 An example of time domain resource allocation relative to subcarrier spacing of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure is shown;

[0017] Fig. 9 An example of central processing unit (CPU) occupancy time for a CSI report where the number of reports included in the CSI report is not configured as “None” according to some embodiments of the present disclosure is shown;

[0018] Fig.10 An example of CPU occupancy time of a CSI report where the number of reports included in the CSI report is configured as "None" according to some embodiments of the present disclosure is shown;

[0019] Fig.11 An example of dividing a listen-before-talk (LBT) subband in a wireless communication system according to various embodiments of the present disclosure is shown;

[0020] Fig.12 An example of effective downlink time slot determination based on correlation between downlink symbols and flexible symbols configured via a higher layer and channel occupancy duration in a downlink time slot according to some embodiments of the present disclosure is shown;

[0021] Fig.13 Another example of effective downlink time slot determination according to some embodiments of the present disclosure is shown;

[0022] Fig.14 An example of CPU occupancy calculation according to some embodiments of the present disclosure is shown;

[0023] Fig.15 Another example of CPU occupancy calculation according to some embodiments of the present disclosure is shown;

[0024] Fig.16 A flowchart showing the operation sequence of a base station and a terminal according to some embodiments of the present disclosure;

[0025] Fig.17 A block diagram showing a configuration of a terminal according to some embodiments of the present disclosure; and

[0026] Fig.18 is a block diagram illustrating a configuration of a base station according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0027] Best Mode for Carrying Out the Invention

[0028] The present disclosure provides a communication method for saving power of a terminal, and a method and apparatus for reporting channel state information based on a communication method in a wireless communication system.

[0029] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0030] According to an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system includes: receiving configuration information associated with a channel state information (CSI) report from a base station, the configuration information including at least one information associated with a CSI resource setting; receiving information associated with a channel occupancy duration from the base station; determining whether at least one symbol for receiving a channel state information reference signal (CSI-RS) is within the channel occupancy duration based on at least one information associated with the CSI resource setting and the received information associated with the channel occupancy duration; receiving at least one CSI-RS from the base station on at least one symbol based on a result of the determination; and when determining to send a CSI report, sending the CSI report to the base station based on the configuration information associated with the CSI report and the received at least one CSI-RS.

[0031] When it is determined that at least one symbol for receiving the CSI-RS is not within the channel occupancy duration, the terminal may not receive at least one CSI-RS on the at least one symbol, and when it is determined that at least one symbol for receiving the CSI-RS is within the channel occupancy duration, the terminal may receive at least one CSI-RS based on the at least one symbol.

[0032] The method may also include: determining whether an uplink channel used to send the CSI report is within the channel occupancy duration based on configuration information associated with the CSI report and information associated with the channel occupancy duration; and determining the CSI report to be sent when the uplink channel used to send the CSI report is within the channel occupancy duration.

[0033] Receiving at least one CSI-RS on at least one symbol based on the result of the determination may include: determining that all symbols for receiving the CSI-RS are within a channel occupancy duration; and receiving the CSI-RS if all symbols for receiving the CSI-RS are within the channel occupancy duration.

[0034] Based on the determined result, receiving at least one CSI-RS on at least one symbol may include: determining that at least one symbol for receiving the CSI-RS is within the channel occupancy duration; and receiving the CSI-RS if the at least one symbol for receiving the CSI-RS is within the channel occupancy duration.

[0035] The method may further include determining a CSI processing unit (CPU) occupancy time without considering a channel occupancy duration, wherein the CSI report may be sent based on the determined CSI processing unit CPU occupancy time.

[0036] The method may further include: identifying a channel non-occupancy duration for a CSI report based on information associated with the channel occupancy duration; determining a most recent CSI-RS before the channel non-occupancy duration for the CSI report; and determining a CSI processing unit CPU occupancy time for the CSI report based on the most recent CSI-RS before the channel non-occupancy duration, wherein the CSI report may be sent based on the determined CSI processing unit CPU occupancy time.

[0037] The method may further include: identifying a channel non-occupancy duration for CSI reporting based on information associated with the channel occupation duration; and determining a latest CSI-RS before the channel non-occupancy duration for CSI reporting, wherein the CSI report may be sent based on the latest CSI-RS.

[0038] According to an embodiment of the present disclosure, a method performed by a base station in a wireless communication system includes: sending configuration information associated with a CSI report to a terminal, the configuration information including at least one information associated with a CSI resource setting; sending information associated with a channel occupancy duration to the terminal; sending at least one CSI-RS to the terminal; and receiving a CSI report from the terminal based on the configuration information associated with the CSI report, wherein the CSI report is sent by the terminal based on at least one CSI-RS and some of the at least one information associated with the CSI resource setting, and wherein some of the at least one CSI-RS include at least one CSI-RS within the channel occupancy duration.

[0039] When it is determined that at least one symbol for sending at least one CSI-RS is not within the channel occupancy duration, the terminal may not receive at least one CSI-RS based on the at least one symbol, and when it is determined that at least one symbol for sending at least one CSI-RS is within the channel occupancy duration, the terminal may receive at least one CSI-RS based on the at least one symbol.

[0040] According to an embodiment of the present disclosure, a terminal in a wireless communication system includes: a transceiver; and at least one processor, the at least one processor being coupled to the transceiver and configured to: receive configuration information associated with a CSI report from a base station, the configuration information including at least one information associated with a CSI resource setting; receive information associated with a channel occupancy duration from the base station; determine whether at least one symbol for receiving a CSI-RS is within the channel occupancy duration based on at least one information associated with the CSI resource setting and the received information associated with the channel occupancy duration; receive at least one CSI-RS from the base station on at least one symbol based on a result of the determination; and when determining to send a CSI report, send the CSI report to the base station based on the configuration information associated with the CSI report and the received at least one CSI-RS.

[0041] When it is determined that at least one symbol for receiving the CSI-RS is not within the channel occupancy duration, the terminal may not receive at least one CSI-RS based on the at least one symbol, and when it is determined that at least one symbol for receiving the CSI-RS is within the channel occupancy duration, the terminal may receive at least one CSI-RS based on the at least one symbol.

[0042] At least one processor may also be configured to: determine whether an uplink channel used to send a CSI report is within the channel occupancy duration based on configuration information associated with the CSI report and information associated with the channel occupancy duration; and determine a CSI report to be sent when the uplink channel used to send the CSI report is within the channel occupancy duration.

[0043] The at least one processor may also be configured to: determine that all symbols for receiving the CSI-RS are within a channel occupancy duration; and receive the CSI-RS if all symbols for receiving the CSI-RS are within the channel occupancy duration.

[0044] The at least one processor may also be configured to: determine that at least one symbol for receiving CSI-RS is within a channel occupancy duration; and receive CSI-RS if the at least one symbol for receiving CSI-RS is within the channel occupancy duration.

[0045] The at least one processor may also be configured to determine a CSI processing unit (CPU) occupancy time regardless of the channel occupancy duration, wherein the CSI report may be sent based on the determined CSI processing unit CPU occupancy time.

[0046] At least one processor may also be configured to: identify a channel non-occupancy duration for a CSI report based on information associated with the channel occupancy duration; determine a most recent CSI-RS before the channel non-occupancy duration for the CSI report; and determine a CSI processing unit CPU occupancy time for the CSI report based on the most recent CSI-RS before the channel non-occupancy duration, wherein the CSI report may be sent based on the determined CSI processing unit CPU occupancy time.

[0047] At least one processor may also be configured to: identify a channel non-occupied duration for CSI reporting based on information associated with the channel occupied duration; and determine a most recent CSI-RS before the channel non-occupied duration for CSI reporting, wherein the CSI report may be sent based on the most recent CSI-RS.

[0048] According to an embodiment of the present disclosure, a base station in a wireless communication system includes: a transceiver; and at least one processor, the at least one processor is coupled to the transceiver and is configured to: send configuration information associated with a CSI report to a terminal, including at least one information associated with a CSI resource setting; send information associated with a channel occupancy duration to the terminal; send at least one CSI-RS to the terminal; and receive a CSI report from the terminal based on the configuration information associated with the CSI report, wherein the CSI report is sent by the terminal based on at least one CSI-RS and some of the at least one information associated with the CSI resource setting, and wherein some of the at least one CSI-RS include at least one CSI-RS within the channel occupancy duration.

[0049] When it is determined that at least one symbol for sending at least one CSI-RS is not within the channel occupancy duration, the terminal may not receive at least one CSI-RS based on the at least one symbol, and when it is determined that at least one symbol for sending at least one CSI-RS is within the channel occupancy duration, the terminal may receive at least one CSI-RS based on the at least one symbol.

[0050] Before describing the following specific embodiments, it may be helpful to set forth definitions of certain words and phrases used throughout this patent document: the terms "include" and "comprising" and their derivatives mean including but not limited to; the term "or" is inclusive, meaning and / or; the phrases "associated with" and "associated with" and their derivatives may mean including, included within, interconnected with, containing, contained within, connected to or connected with, coupled to or coupled with, capable of communicating with, cooperating with, interleaved, juxtaposed, proximate to, bound to or bound with, having, having the property of, and the like; and the term "controller" means any device, system, or portion thereof that controls at least one operation, such device being implemented in hardware, firmware, or software, or some combination of at least two thereof. It should be noted that the functionality associated with any particular controller may be centralized or distributed, whether locally or remotely.

[0051] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data or a part thereof suitable for implementation with a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disc (CD), a digital video disc (DVD) or any other type of memory. "Non-transitory" computer-readable media excludes wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data, and media that can store data and then rewrite data, such as rewritable optical discs or erasable memory devices.

[0052] Definitions for certain words and phrases are provided throughout this patent document, those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases. DETAILED DESCRIPTION

[0054] Discussed below Figures 1 to 18 The various embodiments used to describe the principles of the present disclosure in this patent document are only for illustration and should not be interpreted in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0055] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0056] When describing the embodiments of the present disclosure, technical problems that are well known in the technical field of the present disclosure and are not directly related to the present disclosure are not described. By omitting any unnecessary description, the subject matter of the present disclosure will be described more clearly without being obscure.

[0057] For the same reason, some elements will be enlarged, omitted or simplified in the accompanying drawings. The size of each element does not fully reflect the actual size of the element. In each of the accompanying drawings, the same or corresponding elements will be referenced to the same reference numerals.

[0058] With reference to the embodiments of the present disclosure described below in conjunction with the accompanying drawings, the advantages and features of the present disclosure and methods for achieving them will be apparent. However, the present disclosure is not limited to the embodiments disclosed therein, but can be implemented in various ways, and the embodiments of the present disclosure are provided to complete the disclosure of the present disclosure and allow those of ordinary skill in the art to understand the scope of the present disclosure, and the present disclosure is defined by the scope of the claims. Throughout the specification, the same reference numerals will indicate the same elements.

[0059] Throughout the present disclosure, the expression “at least one of a, b, or c” indicates only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c; or variations thereof.

[0060] Examples of the terminal may include a User Equipment (UE), a Mobile Station (MS), a cellular phone, a smart phone, a computer, a multimedia system capable of performing a communication function, and the like.

[0061] In this disclosure, a controller may also be referred to as a processor.

[0062] Throughout the specification, a layer (or a layer arrangement) may also be referred to as an entity.

[0063] It will be understood that each box of the flowchart and / or block diagram illustration and the combination of boxes in the flowchart and / or block diagram illustration can be implemented by computer program instructions. These computer program instructions can also be stored in a processor of a general-purpose computer, a special-purpose computer or other programmable data processing device, so that the instructions implemented by the processor of the computer or programmable data processing device will produce a method for performing the functions specified in one or more boxes of the flowchart and / or block diagram. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can direct the computer or other programmable data processing device to function in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce a product including instructions for implementing the functions specified in one or more boxes of the flowchart and / or block diagram. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device can provide steps for implementing the functions specified in one or more boxes of the flowchart and / or block diagram.

[0064] In addition, each box represents a module, a code segment or a code portion, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in other implementations, the functions mentioned in the box may not occur in the indicated order. For example, depending on the functions involved, two boxes shown in succession can actually be executed substantially simultaneously, or boxes can sometimes be executed in reverse order.

[0065] The term "unit" used herein refers to a software or hardware element, such as a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), etc., and the "unit" plays a specific role. However, the meaning of "unit" is not limited to software or hardware. "Unit" can be advantageously configured to reside on an addressable storage medium and configured to reproduce one or more processors. Therefore, according to some embodiments of the present disclosure, for example, a unit may include components (such as software components, object-oriented software components, class components, and task components), processes, functions, attributes, programs, subroutines, program code segments, drivers, firmware, microcodes, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided for components and "units" can be combined into fewer components and "units", or further separated into additional components and "units". In addition, components and "units" can be implemented to execute one or more CPUs in a device or a secure multimedia card. According to some embodiments of the present disclosure, a "unit" may include one or more processors.

[0066] Hereinafter, the working principle of the present disclosure will be described with reference to the accompanying drawings. In the following description of the present disclosure, if the detailed description of the well-known functions or elements associated with the present disclosure unnecessarily obscures the subject matter of the present disclosure, the description will be omitted. The terms used herein are defined in consideration of the functions in the present disclosure, and the terms can be replaced with other terms according to the intention or practice of the user or operator. Therefore, the terms should be defined based on the overall disclosure. Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, an evolved node B (eNode B), a node B, a base station (BS), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE, an MS, a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. Of course, the present disclosure is not limited to examples. Hereinafter, the present disclosure will describe a technology for receiving broadcast information from a base station by a terminal in a wireless communication system. The present disclosure relates to a communication technology that is a fusion of an Internet of Things (IoT) technology and a fifth generation (5G) communication system for supporting a higher data transmission rate beyond a fourth generation (4G) system, and to a system for the communication technology. The present disclosure can be applied to smart services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) based on 5G communication technology and IoT-related technology.

[0067] As used below, for the convenience of description, terms indicating broadcast information, terms indicating control information, terms related to communication coverage, terms indicating a state change (e.g., an event), terms indicating a network entity, terms indicating a message, terms indicating a component of a device, etc. will be presented. Therefore, the present disclosure is not limited to the following terms, and other terms having equivalent technical meanings may be used.

[0068] Hereinafter, for the convenience of description, the present disclosure may adopt terms and names defined in the 3rd Generation Partnership Project Long Term Evolution (3GPP LTE) standard. However, the present disclosure is not limited to such terms and names, and may also be applied to systems conforming to other standards.

[0069] Wireless communication systems have evolved from initially providing voice-oriented services to broadband wireless communication systems that provide high-speed and high-quality packet data services, similar to communication standards such as 3GPP High Speed ​​Packet Access (HSPA), LTE or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2 High Rate Packet Data (HRPD), Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.16e, etc.

[0070] In the LTE system, which is a representative example of a broadband wireless communication system, orthogonal frequency division multiplexing (OFDM) is used in DL and single carrier frequency division multiple access (SC-FDMA) is used in UL. UL means a radio link over which a UE sends data or a control signal to a base station (eNodeB or BS), and DL means a radio link over which a base station sends data or a control signal to a UE. The above-mentioned multiple access scheme separates the data or control information of each user by allocating and operating a time-frequency resource on which the data or control information is carried for each user, so that the time-frequency resources do not overlap with each other, that is, so that orthogonality is achieved.

[0071] As a post-LTE communication system, the 5G communication system needs to freely reflect various demands from users and service providers, so that services that meet various demands must be supported. The services considered by the 5G communication system may include enhanced mobile broadband (eMBB) communication, massive machine type communication (mMTC) and ultra-reliable low latency communication (URLLC).

[0072] According to some embodiments of the present disclosure, eMBB may be intended to provide a data transmission speed that is further enhanced compared to the data transmission speed supported by the existing LTE, LTE-A or LTE-Pro. For example, in a 5G communication system, for one BS, eMBB needs to provide a peak data rate of 20Gbps in DL and a peak data rate of 10Gbps in UL. In addition, a 5G or NR communication system should be able to provide an increased user-perceived data rate. In order to meet this demand, it is necessary to improve the transmission and reception technology including further enhanced MIMO transmission technology. In addition, by using a frequency bandwidth wider than 20Mhz in a frequency band of 3 to 6GHz or larger instead of the 2GHz frequency band used in the current LTE, the data rate required by the 5G communication system may be met.

[0073] Meanwhile, in the 5G communication system, mMTC is considered in order to support application services such as IoT. In order for mMTC to be effectively provided for IoT, it is necessary to access many UEs within a single cell, improve UE coverage, increase battery time, and reduce UE costs. IoT is attached to various sensors and various devices to provide communication functions, and therefore should be able to support many UEs (e.g., 1,000,000 UE / km) within a cell. 2 ). In addition, UEs supporting mMTC require wider coverage than other services provided by the 5G communication system, because the UE is very likely to be located in a blind area not covered by a cell, such as underground in a building. Terminals supporting mMTC need to be cheap UEs, and since it is difficult to frequently replace the battery of the UE, a very long battery life is required.

[0074] Finally, URLLC is a mission-critical cellular-based wireless communication service and may require communications with ultra-low latency and ultra-high reliability to be provided as a service for remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare, emergency alerts, etc. For example, a URLLC-enabled service may require an air interface latency of less than 0.5 milliseconds and also require 10 -5 Or a smaller packet error rate. Therefore, for services supporting URLLC, the 5G communication system needs to provide a transmission time interval (TTI) that is smaller than other services, and also requires a design for allocating resources over a wide bandwidth. However, the above-mentioned mMTC, URLLC, and eMBB are only examples of different service types, and the service types to which the present disclosure is applied are not limited to the aforementioned examples.

[0075] The services considered in the above 5G communication system need to be provided by integration based on a framework. That is, for efficient resource management and control, services can be controlled and sent by integration into one system instead of managing the services independently.

[0076] Although the embodiments of the present disclosure are described by using LTE, LTE-A, LTE-Pro or NR systems as examples, the embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel forms. In addition, the embodiments of the present disclosure may also be applied to other communication systems by making some modifications based on the determination of technicians within the scope that does not substantially depart from the scope of the present disclosure.

[0077] The present disclosure relates to a random access method and apparatus for multiple devices in a wireless communication system.

[0078] According to the present disclosure, when a terminal in a wireless communication system operates in a power saving mode, a method of reporting channel state information can be optimized for this situation, thereby further enhancing the power saving effect.

[0079] Hereinafter, the framework structure of the 5G system will be described in more detail with reference to the accompanying drawings.

[0080] Figure 1 The basic structure of the time-frequency domain as a resource domain of a wireless communication system according to an embodiment of the present disclosure is shown.

[0081] refer to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time domain and the frequency domain, the basic unit of resources is a resource element (RE) 1-01, and can be defined as one orthogonal frequency division multiplexing (OFDM) symbol 1-02 along the time axis and one subcarrier 1-03 along the frequency axis. In the frequency domain, (For example, 12) consecutive REs may constitute one resource block (RB) 1 - 04. In one embodiment of the present disclosure, a plurality of OFDM symbols may constitute one subframe 1 - 10.

[0082] Figure 2 A diagram is shown for describing a frame, subframe, and slot structure of a wireless communication system according to an embodiment of the present disclosure.

[0083] refer to Figure 2 , a frame 2-00 may include one or more subframes 2-01, each of which may include one or more time slots 2-02. For example, a frame 2-00 may be defined as 10 ms. A subframe 2-01 may be defined as 1 ms, so that a frame 2-00 may include a total of 10 subframes 2-01. A time slot 2-02 or 2-03 may be defined as fourteen OFDM symbols (i.e., the number of time slots per time slot is 10). ). One subframe 2-01 may include one time slot or a plurality of time slots 2-02 and 2-03, and the number of time slots 2-02 and 2-03 of each subframe 2-01 may vary according to the set values ​​μ2-04 and 2-05 for the subcarrier spacing. Figure 2 The example shows μ = 0 2-04 and μ = 1 2-05 as the setting value of the subcarrier spacing. For μ = 0 2-04, one subframe 2-01 may include one time slot 2-02, and for μ = 1 2-05, one subframe 2-01 may include two time slots 2-03. That is, the number of time slots per subframe is The number of time slots per frame may vary depending on the setting value μ for the subcarrier spacing. The number of slots per subframe can vary. and can be defined as shown in [Table 1].

[0084] [Table 1]

[0085]

[0086] In NR, one component carrier (CC) or serving cell may include up to 250 or more RBs. Therefore, when the terminal always receives the serving cell bandwidth as in LTE, the power consumption of the terminal may be very large, and to solve this problem, the base station can configure one or more bandwidth parts (BWPs) for the terminal to support the terminal to change the reception area in the cell. In NR, the base station can configure the "initial BWP" for the terminal through the MIB, which is the bandwidth of the control area CORESET#0 (or common search space (CSS)). Thereafter, the base station can configure the first BWP of the terminal through RRC signaling, and notify at least one BWP configuration information that can be indicated by downlink control information (DCI) in the future. Thereafter, the base station can indicate the frequency band to be used by the terminal by notifying the BWP ID through DCI. When the terminal cannot receive DCI in the currently allocated BWP for a specific time or longer, the terminal can return to the "default BWP" and try to receive DCI.

[0087] Figure 3 A diagram is shown for describing an example of bandwidth parts in a wireless communication system according to an embodiment of the present disclosure.

[0088] refer to Figure 3 , UE bandwidth 3-00 may include two BWPs, namely BWP#1 3-05 and BWP#2 3-10. The base station may configure one BWP or multiple BWPs for the terminal, and configure information as shown in [Table 2] for each BWP.

[0089] [Table 2]

[0090]

[0091] However, the present disclosure is not limited to the above examples, and various parameters related to the BWP may also be configured to the terminal. The aforementioned information may be sent from the base station to the terminal through higher layer signaling (e.g., RRC signaling). Among the configured one or more BWPs, at least one BWP may be activated. Whether to activate the configured BWP may be sent from the base station to the terminal in a semi-static manner through RRC signaling or dynamically through a medium access control (MAC) control element (CE) or DCI.

[0092] According to an embodiment of the present disclosure, before the radio resource control (RRC) connection, the initial BWP for the initial connection can be configured from the base station for the terminal through the master information block (MIB). More specifically, the terminal can receive the control region (control resource set, CORESET) in which the PDCCH can be sent and the configuration information about the search space, so as to receive the system information (remaining system information (RMSI) or system information block 1 (SIB1)) required for the initial connection through the MIB in the initial connection stage. The control region and search space configured by the MIB can be respectively regarded as identity (ID) 0.

[0093] The base station may notify the terminal of configuration information about CORESET#0 (such as frequency allocation information, time allocation information, numerology, etc.) through MIB. The base station may notify the terminal of configuration information about the monitoring period of CORESET#0 and configuration information for timing, that is, configuration information for search space#0 through MIB. The terminal may regard the frequency domain configured as CORESET#0 obtained from MIB as the initial BWP for the initial connection. In this case, the ID of the initial BWP may be regarded as 0.

[0094] The configuration of the BWP supported by the above-mentioned wireless communication system (5G or NR system) can be used for various purposes.

[0095] For example, when the bandwidth supported by the terminal is less than the system bandwidth, the bandwidth supported by the terminal can be supported by the configuration of the BWP. For example, in [Table 2], since the frequency position of the BWP is configured for the terminal (configuration information 2), the terminal can send and receive data at a specific frequency position within the system bandwidth.

[0096] In another example, to support different numerology, the base station may configure multiple BWPs for the terminal. For example, to support data transmission and reception using a subcarrier spacing of 15 KHz and a subcarrier spacing of 30 KHz by the terminal, two BWPs may be configured to use a subcarrier spacing of 15 KHz and a subcarrier spacing of 30 KHz, respectively. Different BWPs may be subject to frequency division multiplexing (FDM), and a BWP configured with a corresponding subcarrier spacing may be activated to transmit and receive data with the subcarrier spacing.

[0097] In another example, in order to reduce the power consumption of the terminal, the base station can configure a BWP with different bandwidths for the terminal. For example, when the terminal supports a large bandwidth (e.g., a bandwidth of 100 MHz) and always sends and receives data with this bandwidth, it may cause a lot of power consumption. Specifically, in the absence of traffic, monitoring of unnecessary downlink control channels with a large bandwidth of 100 MHz may be more inefficient for the terminal in terms of power consumption. Therefore, in order to reduce the power consumption of the terminal, the base station can configure a BWP with a small bandwidth, such as a BWP of 20 MHz, for the terminal. In the absence of traffic, the terminal can monitor at a BWP of 20 MHz, and when generating data, the terminal can send and receive data by using a BWP of 100 MHz according to the instructions of the base station.

[0098] In the above-mentioned method for configuring BWP, the terminal before RRC connection can receive configuration information about the initial BWP through MIB in the initial connection stage. More specifically, the terminal can be configured with a control region (CORESET) for a downlink control channel, and the DCI for scheduling the system information block (SIB) in the downlink control channel is sent through the MIB of the physical broadcast channel (PBCH). The bandwidth of the control region configured by MIB can be regarded as the initial BWP, and the terminal can receive the PDSCH in which the SIB is sent through the configured initial BWP. The initial BWP can be used for other system information (OSI), paging and random access, and for receiving SIB.

[0099] Hereinafter, a synchronization signal (SS) / PBCH block of a wireless communication system (5G or NR system) according to an embodiment of the present disclosure will be described.

[0100] The SS / PBCH block may mean a physical layer channel block including a primary SS (PSS), a secondary SS (SSS), and a PBCH. More specifically, the SS / PBCH block may be defined as follows.

[0101] -PSS: A signal that provides partial information of the cell ID as a standard for downlink time / frequency synchronization.

[0102] -SSS: is a standard for downlink time / frequency synchronization and provides additional cell ID information not provided by PSS. In addition, SSS is used as a reference signal for PBCH demodulation.

[0103] -PBCH: Provides basic system information required for the transmission / reception of data channels and control channels of the terminal. The basic system information may include search space-related control information indicating radio resource mapping information of the control channel, and scheduling control information of a separate data channel for transmitting system information.

[0104] -SS / PBCH block: An SS / PBCH block may include a combination of PSS, SSS, and PBCH. One SS / PBCH block or multiple SS / PBCH blocks may be transmitted during 5 ms, and each transmitted SS / PBCH block may be identified by an index.

[0105] The terminal can detect PSS and SSS and decode PBCH in the initial connection phase. The terminal can obtain MIB from PBCH and can be configured with CORESET#0 through MIB. Assuming that the selected SS / PBCH block and the demodulation reference signal (DMRS) sent in CORESET#0 are quasi-co-located (QCL), the terminal can perform monitoring relative to CORESET#0. The terminal can receive system information through the downlink control information sent in CORESET#0. The terminal can obtain the random access channel (RACH) related configuration information required for the initial connection from the received system information. Based on the selected SS / PBCH index, the terminal can send a physical RACH (PRACH) to the base station, and the base station that has received the PRACH can obtain information about the SS / PBCH block index selected by the terminal. The base station can identify which block of the SS / PBCH block the terminal has selected, and the terminal monitors CORESET#0 corresponding to (or related to) the SS / PBCH block selected by the terminal.

[0106] Hereinafter, DCI in a wireless communication system (e.g., 5G or NR system) will be described in more detail.

[0107] In a wireless communication system (e.g., a 5G or NR system), scheduling information about uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) can be sent from a base station to a terminal via DCI. The terminal can monitor the DCI format for fallback and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may include a predefined fixed field between the base station and the terminal, while the non-fallback DCI format may include a configurable field.

[0108] DCI can be sent through a physical downlink control channel (PDCCH) through channel decoding and modulation. A cyclic redundancy check (CRC) can be added to the DCI message payload, and the CRC can be scrambled by a radio network temporary identifier (RNTI) corresponding to the identity of the terminal. Depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, random access responses, etc., different RNTIs can be used to scramble the CRC added to the payload of the DCI message. That is, the RNTI can be sent by including it in the CRC calculation instead of being explicitly sent. After receiving the DCI message sent on the PDCCH, the terminal can identify the CRC by using the assigned RNTI. When the CRC identification result is correct, the terminal can recognize that the message is sent to the terminal.

[0109] For example, the DCI for the PDSCH used to schedule system information (SI) can be scrambled by SI-RNTI. The DCI for the PDSCH used to schedule a random access response (RAR) message can be scrambled by RA-RNTI. The DCI for the PDSCH used to schedule a paging message can be scrambled by P-RNTI. The DCI for notifying the slot format indicator (SFI) can be scrambled by SFI-RNTI. The DCI for notifying the transmit power control (TPC) can be scrambled by TPC-RNTI. The DCI for scheduling a terminal-specific PDSCH or PUSCH can be scrambled by cell-RNTI (C-RNTI).

[0110] DCI format 0_0 may be used as a fallback DCI for scheduling PDSCH, and in this case, the CRC may be scrambled by C-RNTI. In an embodiment of the present disclosure, DCI format 0_0 in which the CRC is scrambled by C-RNTI may include information as shown in [Table 3].

[0111] [Table 3]

[0112]

[0113]

[0114] DCI format 0_1 ​​may be used as a non-fallback DCI for scheduling PUSCH, and in this case, the CRC may be scrambled by C-RNTI. In an embodiment of the present disclosure, DCI format 0_1 ​​in which the CRC is scrambled by C-RNTI may include information as shown in [Table 4].

[0115] [Table 4]

[0116]

[0117]

[0118] DCI format 1_0 may be used as a fallback DCI for scheduling PDSCH, and in this case, the CRC may be scrambled by C-RNTI. In an embodiment of the present disclosure, DCI format 1_0 in which the CRC is scrambled by C-RNTI may include information as shown in [Table 5].

[0119] [Table 5]

[0120]

[0121]

[0122] DCI format 1_1 may be used as a non-fallback DCI for scheduling PUSCH, and in this case, the CRC may be scrambled by the C-RNTI. In an embodiment of the present disclosure, the DCI format 1_1 in which the CRC is scrambled by the C-RNTI may include information as shown in [Table 6].

[0123] [Table 6]

[0124]

[0125]

[0126] Figure 4 A diagram is shown for describing a control region (control resource set (CORESET)) of a downlink control channel of a wireless communication system according to an embodiment of the present disclosure.

[0127] refer to Figure 4 , it can be seen that two control regions (CORESET#1 4-01 and CORESET#2 4-02) are configured in the terminal bandwidth part 4-10 in the frequency axis and in one time slot 4-20 in the time axis. The control regions 4-01 and 4-02 can be configured in a specific resource 4-03 within the entire terminal bandwidth part 4-10 in the frequency axis. In the time axis, the control regions 4-01 and 4-02 can be configured with one OFDM symbol or multiple OFDM symbols, which can be defined as the CORESET duration 4-04. Reference Figure 4 , CORESET#1 4-01 may be configured with a CORESET duration of 2 symbols, and CORESET#2 4-02 may be configured with a CORESET duration of 1 symbol.

[0128] The control region in the wireless communication system (e.g., 5G or NR system) may be configured for the terminal by the BS through higher layer signaling (e.g., system information, MIB, RRC signaling, etc.). Configuring the control region for the terminal may mean providing information such as the ID of the control region, the frequency position of the control region, the symbol length of the control region, etc. For example, the configuration of the control region may include information as provided in [Table 7].

[0129] [Table 7]

[0130]

[0131] In [Table 7], the tci-StatesPDCCH (hereinafter referred to as "TCI state") configuration information may include information of one or more SS / PBCH block indices having a QCL relationship with a DMRS transmitted in a corresponding control region or CSI-RS index.

[0132] Figure 5 A diagram for describing the structure of a downlink control channel of a wireless communication system according to an embodiment of the present disclosure is shown.

[0133] Figure 5 An example of a basic unit of time and frequency resources forming a downlink control channel that can be used in a 5G system according to an embodiment of the present disclosure is shown.

[0134] refer to Figure 5 , the basic unit of time and frequency resources forming the control channel can be defined as a resource element group (REG) 5-03. REG 5-03 can be defined as 12 subcarriers, including one OFDM symbol 5-01 in the time axis and one physical resource block (PRB) 5-02 in the frequency axis. The base station can configure the downlink control channel allocation unit by connecting REG 5-03.

[0135] like Figure 5 As shown in , when it is assumed that the basic unit to which the downlink control channel is allocated is a control channel element (CCE) 5-04 in the 5G system, one CCE 5-04 may include multiple REGs 5-03. For example, Figure 5The REG 5-03 shown in the figure may include 12 REs, and when one CCE 5-04 includes six REGs 5-03, one CCE 5-04 may include 72 REs. When a downlink control region (control resource set) is configured, the downlink control region may include multiple CCEs 5-04, and a specific downlink control channel may be transmitted by mapping to one or more CCEs 504 according to an aggregation level (AL) in the control region. The CCE 5-04 in the control region (control resource set) may be identified by numbering, wherein the numbering of the CCE 5-04 may be given based on a logical mapping scheme.

[0136] Figure 5 The basic unit of the downlink control channel shown in FIG. 5 (ie, REG 5-03) may include both the RE to which the DCI is mapped and the region to which the reference signal DMRS 5-05 for decoding the RE is mapped. Figure 5 As shown in , three DMRS 5-05 can be sent in one REG 5-03. Depending on AL, the number of CCEs required to send PDCCH can be 1, 2, 4, 8 and 16, and different numbers of CCEs can be used to achieve link adaptation of downlink control channels. For example, when AL=L, one downlink control channel can be sent through L CCEs.

[0137] The terminal needs to detect the signal without knowing the information about the downlink control channel, and a search space indicating a set of CCEs for blind decoding can be defined. The search space can be a set of downlink control channel candidates, including CCEs that the terminal must try to decode at a given AL. Because there are several ALs that form a group with 1, 2, 4, 8 or 16 CCEs, the terminal can have multiple search spaces. The search space set can be defined as a set of search spaces under all configured ALs.

[0138] The search space may be divided into a common search space or a terminal-specific (UE-specific) search space. According to an embodiment of the present disclosure, terminals in a specific group or all terminals may investigate the common search space of the PDCCH in order to receive cell-common control information, such as for dynamic scheduling of system information or paging messages.

[0139] For example, the terminal may investigate the common search space of the PDCCH to receive PDSCH scheduling allocation information for the transmission of the SIB, including the operator information of the cell, etc. For the common search space, the terminals in a specific group or all terminals must receive the PDCCH so that the common search space can be defined as a set of pre-agreed CCEs. At the same time, the terminal may receive scheduling allocation information about a terminal-specific PDSCH or PUSCH by investigating the terminal-specific search space of the PDCCH. The terminal-specific search space may be defined in a terminal-specific manner according to the identity of the terminal and various system parameters.

[0140] In the 5G system, the base station may set the parameters of the search space for PDCCH for the terminal through higher layer signaling (e.g., SIB, MIB or RRC signaling). For example, the base station may configure the number of PDCCH candidates under each ALL, the monitoring period of the search space, the monitoring timing of the symbol unit in the time slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, the control region (control resource set) index for monitoring the search space, etc. For example, the aforementioned configuration may include information as provided in [Table 8].

[0141] [Table 8]

[0142]

[0143] Based on the configuration information, the base station may configure one or more search space sets for the terminal. According to an embodiment of the present disclosure, the base station may configure search space set 1 and search space set 2 for the terminal, configure the terminal to monitor DCI format A scrambled by X-RNTI in search space set 1 in a common search space, and / or configure the terminal to monitor DCI format B scrambled by Y-RNTI in search space set 2 in a terminal-specific search space.

[0144] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, while search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0145] In the common search space, the following combinations of DCI formats and RNTIs may be monitored. Of course, the present disclosure is not limited to the following examples.

[0146] -DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0147] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0148] -DCI format 2_1 with CRC scrambled by INT-RNTI

[0149] -DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0150] -DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0151] In the terminal-specific search space, a combination of DCI format and RNTI may be monitored.Of course, the present disclosure is not limited to the following examples.

[0152] -DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0153] -DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0154] The described RNTI may follow the following definitions and purposes.

[0155] C-RNTI (cell RNTI): terminal-specific PDSCH scheduling purpose

[0156] TC-RNTI (Temporary Cell RNTI): Terminal-specific PDSCH scheduling purpose

[0157] CS-RNTI (Configured Scheduling RNTI): Terminal-specific PDSCH scheduling for quasi-static configuration

[0158] RA-RNTI (Random Access RNTI): used for PDSCH scheduling in the random access phase

[0159] P-RNTI (Paging RNTI): used for PDSCH scheduling for paging transmission

[0160] SI-RNTI (System Information RNTI): used for PDSCH scheduling for transmission of system information

[0161] INT-RNTI (interrupt RNTI): used to notify the puncturing of PDSCH

[0162] TPC-PUSCH-RNTI (transmit power control for PUSCH RNTI): used to indicate the power control command for PUSCH

[0163] TPC-PUCCH-RNTI (transmit power control for PUCCH RNTI): used to indicate the power control command for PUCCH

[0164] TPC-SRS-RNTI (transmit power control for SRS RNTI): used to indicate the power control command for SRS

[0165] In an embodiment of the present disclosure, the aforementioned DCI format may be defined as shown in [Table 9].

[0166] [Table 9]

[0167]

[0168] According to an embodiment of the present disclosure, in a 5G system, multiple search space sets may be configured with different parameters (e.g., parameters of [Table 8]). Therefore, the group of search space sets detected by the terminal may be different at each time point. For example, when search space set #1 is configured with an X-time slot period, search space set #2 is configured with a Y-time slot period, and X and Y are different from each other, the terminal may monitor both search space set #1 and search space set #2 in a specific time slot, and monitor one of them in another specific time slot.

[0169] When multiple search space sets are configured for a terminal, the following conditions may be considered to determine the search space set to be monitored by the terminal.

[0170] [Condition 1: Constraint on the maximum number of PDCCH candidates]

[0171] The number of PDCCH candidates to be monitored in each time slot may not exceed M μ In the configuration with 15·2 μ kHz subcarrier spacing in the cell, M μ It can be defined as the maximum number of PDCCH candidates per time slot as shown in [Table 10].

[0172] [Table 10]

[0173]

[0174] [Condition 2: Constraint on the maximum number of CCEs]

[0175] The number of CCEs that constitute the entire search space in each time slot (in this article, the entire search space may refer to the entire CCE set corresponding to the joint area of ​​multiple search space sets) may not exceed Cμ In the configuration with 15·2 μ kHz subcarrier spacing in the cell, C μ It can be defined as the maximum number of CCEs per time slot as shown in [Table 11].

[0176] [Table 11]

[0177] μ <![CDATA[Maximum number of CCEs per time slot and per serving cell (C μ )]]> 0 56 1 56 2 48 3 32

[0178] For ease of description, for example, a situation in which both condition 1 and condition 2 are satisfied at a certain point in time may be defined as “condition A.” Therefore, failure to satisfy condition A may mean that at least one of condition 1 or condition 2 is not satisfied.

[0179] According to the configuration of the search space set by the base station, condition A may not be satisfied at a certain point in time. When condition A is not satisfied at a specific point in time, the terminal may select and monitor some of the search space sets configured to satisfy condition A at the specific point in time, and the base station may send the PDCCH through the selected search space set.

[0180] According to an embodiment of the present disclosure, the following method may be used to select some search spaces in a configured search space set.

[0181] [Method 1]

[0182] When the PDCCH condition A is not met at a certain time point (time slot),

[0183] A terminal (or base station) may select a search space set configured as a common search space type over a search space set configured as a terminal-specific search space type among the search space sets existing at a specific time point.

[0184] When all search space sets set as common search spaces are selected (i.e., condition A is satisfied even after all search space sets configured as common search spaces are selected), the terminal (or base station) may select a search space set configured for a terminal-specific search space. When multiple search space sets are configured as terminal-specific search spaces, the terminal or base station may select a terminal-specific search space set within a range satisfying condition A based on priority. For example, a search space set with a lower search space set index may have a higher priority.

[0185] In the following description, a time and frequency resource allocation method for data transmission in an NR system will be described.

[0186] In the NR system, in addition to allocating frequency domain resource candidates through BWP indication, the following detailed frequency domain resource allocation (FD-RA) method can also be provided.

[0187] Figure 6 An example of frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0188] exist Figure 6 In FIG. 6 , three FD-RA methods are shown, namely Type 0 6-00, Type 1 6-05, and Dynamic Switch 6-10, which can be configured by higher layers in NR.

[0189] See also Figure 6 , when the terminal is configured to use resource type 0 6-00 by higher layer signaling, the DCI for allocating PDSCH to the terminal may include a bitmap including an NRBG bit. The conditions described above will be described again below. NRBG may represent the number of resource block groups (RBGs) determined based on the BWP size allocated by the BWP indicator and the higher layer parameter rbg-Size as shown in [Table 12], and data may be transmitted in the RBG indicated by the bitmap as "1".

[0190] [Table 12]

[0191]

[0192]

[0193] When the terminal is configured to use resource type 1 6-05 by higher layer signaling, some DCIs used to allocate PDSCH to the terminal may have the following characteristics: The above-described conditions will be described again below. In this way, the base station can configure the starting VRB 6-20 and the length 6-25 of the frequency domain resources continuously allocated therefrom.

[0194] When the terminal is configured to use both resource 0 and resource type 1 6-10 by higher layer signaling, some DCI for allocating PDSCH to the terminal may include frequency domain resource allocation information, which includes a bit for setting a payload 6-15 of resource type 0 and a maximum value 6-35 of payloads 6-20 and 6-25 of resource type 1. The conditions described above will be described again below. In this case, one bit may be added to the front (most significant bit (MSB)) of the frequency domain resource allocation information in the DCI, and when a bit of 0 is used, it may indicate that resource type 0 is used, and when a bit of 1 is used, it may indicate that resource type 1 is used.

[0195] Figure 7An example of frequency domain resource allocation of a physical downlink shared channel (PDSCH) in a wireless communication system according to an embodiment of the present disclosure is shown.

[0196] The following description relates to a method for allocating time domain resources for a data channel in a wireless communication system (e.g., a 5G or NR system).

[0197] The base station can configure a table of time domain resource allocation information about PDSCH and PUSCH for the terminal through higher layer signaling (e.g., RRC signaling). A table including a maximum of maxNrofDL-Allocations=16 entries can be configured for PDSCH, and a table including a maximum of maxNrofUL-Allocations=16 entries can be configured for PUSCH. In an embodiment of the present disclosure, the time domain resource allocation information may include: PDCCH to PDSCH time slot timing (the time interval between the timing of receiving the PDCCH and the timing of sending the PDSCH scheduled by the received PDCCH, in time slots, represented by K0); PDCCH to PUSCH time slot timing (the time interval between the timing of receiving the PDCCH and the timing of sending the PUSCH scheduled by the received PDCCH, in time slots, represented by K2); information about the position and length of the starting symbol scheduled by PDSCH or PUSCH in the time slot, the mapping type of PDSCH or PUSCH, etc. For example, information such as [Table 13] or [Table 14] may be notified from the base station to the terminal.

[0198] [Table 13]

[0199] PDSCH-TimeDomainResourceAllocationList information element

[0200]

[0201] [Table 14]

[0202] PUSCH-TimeDomainResourceAllocation information element

[0203]

[0204] The base station may notify the terminal of one of the entries in the table regarding the time domain resource allocation information through L1 signaling (e.g., DCI) (e.g., the time domain resource allocation information may be indicated by "time domain resource allocation" in the DCI). The terminal may obtain the time domain resource allocation information for the PDSCH or PUSCH based on the DCI received from the base station.

[0205] For example, Figure 7An example of time domain resource allocation for an NR system is shown.

[0206] refer to Figure 7 , the base station can use the higher layer, scheduling offset K 0 and the subcarrier spacing (SCS) (μ PDSCH , μ PDCCH )The starting position 7-00 and length 7-05 of the OFDM symbol in a time slot dynamically indicated are used to indicate the time domain position of the PDSCH resource.

[0207] Figure 8 An example of time domain resource allocation for subcarrier spacing of a data channel and a control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0208] refer to Figure 8 , when the SCS of the data channel and the SCS of the control channel are equal to each other, as indicated by 8-00μ PDSCH =μ PDCCH As indicated, the number of time slots for data and control is the same, so that the base station and the terminal can use the predefined time slot offset K 0 On the other hand, when the SCS of the data channel and the SCS of the control channel are different from each other, as shown by 8-05μ PDSCH ≠μ PDCCH As indicated, the number of time slots for data and control are different from each other, so that the base station and the terminal can use the predefined time slot offset K based on the SCS of the PDCCH. 0 To identify the occurrence of scheduling offsets.

[0209] In the LTE system and the NR system, in the state of being connected to the serving base station, the terminal can report the capabilities supported by the terminal to the serving base station. In the following description, this will be referred to as UE capability (report). The base station can send a UE capability query message requesting a capability report to the terminal in the connected state. The UE capability query message may include the UE capability specific to the radio access technology (RAT) type requested by the base station. The RAT type-specific request may include the requested frequency band information. Through the UE capability query message, multiple RAT types can be requested in one RRC message container, or the UE capability query message including each RAT type-specific request can be included and sent to the terminal multiple times. That is, the UE capability query can be repeated multiple times, and the terminal can configure the corresponding UE capability information message, and can report the corresponding UE capability information message multiple times. In the wireless communication system, the terminal capability request can be performed for MR-DC as well as NR, LTE and EN-DC. For reference, the UE capability query message can generally be sent in the initial stage after the terminal performs the connection, or it can be sent under any conditions when the base station needs it.

[0210] At this stage, the terminal that has received the UE capability report request from the base station can configure the terminal capabilities based on the RAT type and frequency band information requested from the base station. In the NR system, the terminal can configure the UE capabilities as follows.

[0211] 1. When a list of LTE and / or NR bands from a base station is provided to the terminal in response to a UE capability request, the terminal can configure a band combination (BC) for EN-DC and NR standalone (SA). That is, based on the bands requested from the base station through FreqBandList, the terminal can configure a candidate BC list for EN-DC and NR SA. The bands may also have priorities written in FreqBandList.

[0212] 2. When the base station sets the "eutra-nr-only" flag or the "eutra" flag and requests UE capability report, the terminal can completely remove the flags related to NR SA BC from the configured candidate BC list. This operation can be performed when the LTE base station (eNB) requests the "eutra" capability.

[0213] 3. Thereafter, the terminal may remove the fallback BC from the configured candidate BC list. In this article, the fallback BC may correspond to the following situation: the frequency band corresponding to at least one SCell is removed from a superset BC, and the superset BC is already able to cover the fallback BC, and therefore the fallback BC may be omitted. This operation may also be applied to MR-DC, i.e., the LTE frequency band. The remaining BC after this operation may be the final "candidate BC list".

[0214] 4. The terminal can select the BC to be reported by selecting a BC suitable for the requested RAT type from the final "candidate BC list". In this step, the terminal can configure the supportedBandCombinationList in a determined order. That is, the terminal can configure the BC and UE capabilities to be reported according to the preset RAT type order. (nr->eutra-nr->eutra). The terminal can configure featureSetCombination for the configured supportedBandCombinationList, and can configure a "candidate feature set combination" list in the candidate BC list, removing the list of fallback BCs (with the same or lower level of capabilities) from the candidate BC list. The "candidate feature set combination" can include all feature set combinations of NR and EUTRA-NR BCs, and can be obtained from the feature set combinations of UE-NR-capability and UE-MRDC-capability containers.

[0215] 5. When the requested RAT type is EUTRA-NR and has an impact, featureSet-Combinations may be included in both containers of UE-MRDC-capabilities and UE-NR-capabilities. However, the feature set for New Radio (NR) may only include UE-NR-capabilities.

[0216] After configuring the UE capabilities, the terminal may send a UE capability information message including the UE capabilities to the base station. The base station may perform scheduling and transmission and reception management suitable for the terminal based on the UE capabilities received from the terminal.

[0217] The NR system may have a CSI framework for indicating CSI measurement and reporting of the terminal in the base station. The CSI framework of the NR system may include at least two elements, namely, resource settings and report settings, wherein the report settings may have a relationship with the resource settings by referencing at least one of the IDs of the resource settings.

[0218] According to an embodiment of the present disclosure, resource settings may include information related to a reference signal (RS) for CSI measurement of a terminal. A base station may configure at least one resource setting for a terminal. For example, a base station and a terminal may send and receive signaling information as shown in [Table 15] to send information about resource settings.

[0219] [Table 15]

[0220]

[0221] In [Table 15], the signaling information "CSI-ResourceConfig" may include information about each resource setting. According to the signaling information, each resource setting may include a resource setting index csi-ResourceConfigId, a BWP index bwp-ID, a resource time domain transmission setting (resourceType), or a resource set list csi-RS-ResourceSetList including at least one resource set. The time domain transmission of the resource may be set to aperiodic transmission, semi-persistent transmission, or periodic transmission. The resource set list may be a group of resource sets for channel measurement or a group of resource sets for interference measurement. When the resource set list is a group including resource sets for channel measurement, each resource set may include at least one resource, which may be a CSI-RS resource or an index of an SS / PBCH block (SSB). When the resource set list is a group including resource sets for interference measurement, each resource set may include at least one CSI interference measurement (CSI-IM) resource.

[0222] For example, when a resource set includes a CSI-RS, the base station and the terminal may exchange signaling information as shown in [Table 16] to transmit information about the resource set.

[0223] [Table 16]

[0224]

[0225] In [Table 16], the signaling information NZP-CSI-RS-ResourceSet may include information about each resource set. According to the signaling information, each resource set may include information about the resource set index nzp-CSI-ResourceSetId or the index group nzp-CSI-RS-Resources of the included CSI-RS, and include part of the information about the spatial domain transmission filter of the included CSI-RS resource (repeated) or part of the tracking purpose trs-Info of the included CSI-RS resource.

[0226] The CSI-RS may be the most representative RS included in the resource set. The base station and the terminal may exchange signaling information as shown in [Table 17] to transmit information on the CSI-RS resource.

[0227] [Table 17]

[0228]

[0229] In [Table 17], the signaling information NZP-CSI-RS-Resource may include information about each CSI-RS. The information included in the signaling information NZP-CSI-RS-Resource may have the following meanings:

[0230] -nzp-CSI-RS-ResourceId: CSI-RS resource index

[0231] -resourceMapping: Resource mapping information of CSI-RS resources

[0232] -powerControlOffset: The ratio between PDSCH EPRE (Energy per Re) and CSI-RS EPRE

[0233] -powerControlOffsetSS: Ratio between SS / PBCH block EPRE and CSI-RS EPRE

[0234] -scramblingID: scrambling index of the CSI-RS sequence

[0235] -periodicityAndOffset: transmission period and time slot offset of CSI-RS resources

[0236] -qcl-InfoPeriodicCSI-RS: When the CSI-RS is a periodic CSI-RS, TCI-state information for the periodic CSI-RS

[0237] The resourceMapping included in the signaling information NZP-CSI-RS-Resource may indicate resource mapping information of the CSI-RS resource, including frequency resource element (RE) mapping, number of ports, symbol mapping, CDM type, frequency resource density, and band mapping information. The number of ports, frequency resource density, CDM type, and time-frequency domain RE mapping configured in this manner may have a value set to one of the rows of [Table 18].

[0238] [Table 18]

[0239]

[0240] [Table 18] Frequency resource density, CDM type, frequency domain and time domain starting position that can indicate CSI-RS component RE pattern, frequency domain RE number (k') and time domain RE number (l') that can be set according to the number of CSI-RS ports x of CSI-RS component RE pattern The aforementioned CSI-RS component RE pattern can be a basic unit for forming CSI-RS resources. With Y=1+max(k') REs in the frequency domain and Z=1+max(l') REs in the time domain, the CSI-RS component RE pattern can include YZ REs. When the number of CSI-RS ports is "1" port, the CSI-RSRE position can be specified without being constrained by the subcarriers in the PRB (physical resource block), and can be specified by a 12-bit bitmap. For the number of CSI-RS ports of {2, 4, 8, 12, 16, 24, 32} and Y=2, the CSI-RS RE position can be specified for every two subcarriers in the PRB, and can be specified by a 6-bit bitmap. For a CSI-RS port number of 4 and Y=4, the CSI-RS RE position can be specified for every four subcarriers in the PRB, and can be specified by a 6-bit bitmap. Similarly, the time domain RE position can be specified by a bitmap totaling 14 bits. In this case, the length of the bitmap can be changed according to Z of [Table 18] as the frequency position is specified, but the principle is similar to the previous description, and therefore redundant description will be omitted.

[0241] According to an embodiment of the present disclosure, a report setting is linked to a resource setting based on at least one ID of a resource setting, and the resource setting linked to the report setting can provide configuration information including information about an RS used for channel information measurement. When channel information measurement is performed using the resource setting linked to the report setting, channel information reporting can be performed using the measured channel information based on a reporting method configured in the linked report setting.

[0242] According to an embodiment of the present disclosure, the report setting may include configuration information related to the CSI reporting method. For example, the base station and the terminal may exchange signaling information as shown in [Table 19] to send information about the report setting.

[0243] [Table 19]

[0244]

[0245] In [Table 19], the signaling information CSI-ReportConfig may include information about each report setting. The information included in the signaling information CSI-ReportConfig may have the following meanings:

[0246] -reportConfigId: Report configuration index

[0247] -carrier: serving cell index

[0248] -resourcesForChannelMeasurement: Index of resource settings for channel measurement associated with the reporting settings

[0249] -csi-IM-ResourcesForInterference: Index of the resource settings of the CSI-IM for interference measurement associated with the reporting settings

[0250] -nzp-CSI-RS-ResourcesForInterference: Resource setting index of CSI-RS index for interference measurement associated with reporting setting

[0251] -reportConfigType: The time domain transmission settings and transmission channels of the channel report, which can have the configuration of aperiodic transmission, semi-persistent PUCCH transmission, semi-periodic PUSCH transmission or periodic transmission

[0252] -reportQuantity: the type of channel information to be reported, which may have the channel information type "cri-RI-PMI-CQI", "cri-RI-i1", "cri-RI-i1-CQI", "cri-RI-CQI", "cri-RSRP", "ssb-Index-RSRP", "cri-RI-LI-PMI-CQI" for the case where the channel report is not sent ("None") and the case where the channel report is sent. In this document, the elements included in the type of channel information may refer to a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI) and / or an L1 reference signal received power (RSRP).

[0253] -reportFreqConfiguration: Whether the channel information to be reported includes information about the entire broadband or information about each subband, where when the channel information includes information about each subband, the configuration information about the subband is included in the channel information

[0254] -timeRestrictionForChannelMeasurements: Whether to constrain the time domain of the reference signal used for channel measurement to be within the reference signal referred to by the channel information to be reported

[0255] -timeRestrictionForInterferenceMeasurements: Whether to restrict the time domain of the reference signal for interference measurement to the reference signal referred to by the channel information to be reported

[0256] -codebookConfig: Codebook information of the channel information to be reported

[0257] -groupBasedBeamReporting: Whether to perform beam grouping for channel reporting

[0258] -cqi-Table: CQI table index to which the channel information to be reported refers

[0259] -subbandSize: Index indicating the subband size of the channel information

[0260] -non-PMI-PortIndication: Port mapping information to be referenced when reporting non-PMI channel information

[0261] When the base station indicates channel information reporting through higher layer signaling or L1 signaling, the terminal can perform channel information reporting by referring to configuration information included in the indicated reporting setting.

[0262] The base station may indicate CSI reporting to the terminal through higher layer signaling including RRC signaling or MAC CE signaling or L1 signaling (eg, common DCI, group common DCI, terminal specific DCI).

[0263] For example, the base station may indicate aperiodic CSI reporting to the terminal through higher layer signaling or DCI using DCI format 0_1. The base station may configure parameters for aperiodic CSI reporting of the terminal or multiple CSI report triggering states including parameters for CSI reporting through higher layer signaling. The parameters for CSI reporting or CSI report triggering states may include a group including a time slot interval or a possible time slot interval between a PDCCH including DCI and a PUCCH or PUSCH including a CSI report, an RS ID for channel state measurement, the type of channel information included, etc. When the base station indicates some of the multiple CSI report triggering states to the terminal through DCI, the terminal may report channel information according to the CSI report configuration of the report setting configured in the indicated CSI report triggering state. The time domain resource allocation of the PUCCH or PUSCH including the CSI report of the terminal may be indicated by: an indication of the time slot interval of the PDCCH indicated by DCI, a starting symbol and a symbol length in the time slot for the time domain resource allocation of the PUSCH, and an indication of the entire PUCCH resource or a portion thereof. For example, the position of the time slot in which the PUSCH including the CSI report of the terminal is transmitted can be indicated by the time slot interval of the PDCCH indicated via DCI, and the starting symbol and symbol length in the time slot can be indicated by the time domain resource allocation field of the DCI.

[0264] For example, the base station may indicate semi-persistent CSI reporting to the terminal through higher layer signaling or DCI using DCI format 0_1. The base station may activate or deactivate semi-persistent CSI reporting through higher layer signaling including MAC CE signaling or DCI scrambled with SP-CSI-RNTI. After activating the semi-persistent CSI reporting, the terminal may periodically report channel information according to the configured time slot interval. After deactivating the semi-persistent CSI reporting, the terminal may stop the activated periodic channel information reporting. The base station may configure parameters for semi-persistent CSI reporting of the terminal or multiple CSI report triggering states including parameters for semi-persistent CSI reporting through higher layer signaling.

[0265] The parameters for CSI reporting or CSI reporting triggering states may include a group including a time slot interval or a possible time slot interval between a PDCCH including a DCI indicating a CSI report and a PUCCH or PUSCH including a CSI report, a time slot interval between a time slot activated by higher layer signaling indicating a CSI report and the PUCCH or PUSCH including a CSI report, a time slot interval period of CSI reporting, a type of channel information to be included, etc. When the base station activates some of a plurality of CSI reporting triggering states or some of a plurality of reporting settings to the terminal through higher layer signaling or DCI, the terminal may report channel information according to a CSI reporting configuration configured in a reporting setting included in the indicated CSI reporting triggering state or an activated reporting setting. The time domain resource allocation of the PUCCH or PUSCH including the CSI report of the terminal may be indicated by: the time slot interval period of the CSI report, the time slot interval of the time slot with the higher layer signaling activated, the time slot interval with the PDCCH indicated by the DCI, the indication of the starting symbol and the symbol length in the time slot for the time domain resource allocation of the PUSCH, and some or all of the PUCCH resource indications therein. For example, the position of the time slot in which the PUSCH including the CSI report of the terminal is transmitted may be indicated by the time slot interval with the PDCCH indicated via the DCI, and the starting symbol and the symbol length in the time slot may be indicated by the time domain resource allocation field of the DCI format 0_1. For example, the position of the time slot in which the PUCCH including the CSI report of the terminal is sent can be indicated by the time slot interval period of the CSI report configured by higher layer signaling and the time slot interval between the time slot in which the higher layer signaling is activated and the time slot including the PUCCH of the CSI report, and the starting symbol and symbol length in the time slot can be indicated by the starting symbol and symbol length of the PUCCH resources configured by higher layer signaling.

[0266] For example, the base station may indicate periodic CSI reporting to the terminal through higher layer signaling. The base station may activate or deactivate periodic CSI reporting through higher layer signaling including RRC signaling. After activating the periodic CSI report, the terminal may periodically report channel information according to the configured time slot interval. After deactivating the periodic CSI report, the terminal may stop the activated periodic channel information report. The base station may configure the report settings including parameters for periodic CSI reporting of the terminal through higher layer signaling. The parameters for CSI reporting may include the time slot interval between the time slot in which the higher layer signaling indicating the CSI report is activated and the PUCCH or PUSCH including the CSI report, the time slot interval period of the CSI report, the RS ID used for channel state measurement, the type of channel information included, etc. The time domain resource allocation of the PUCCH or PUSCH including the CSI report of the terminal may be indicated by: a time slot interval period of the CSI report, a time slot interval having a time slot in which higher layer signaling is activated, a time slot interval having a PDCCH indicated by DCI, an indication of a starting symbol and a symbol length in a time slot for time domain resource allocation of the PUSCH, and some or all PUCCH resource indications. For example, the position of the time slot in which the PUCCH including the CSI report of the terminal is sent may be indicated by the time slot interval period of the CSI report configured by higher layer signaling and the time slot interval between the time slot in which the higher layer signaling is activated and the time slot including the PUCCH of the CSI report, and the starting symbol and the symbol length in the time slot may be indicated by the starting symbol and the symbol length of the PUCCH resources configured by higher layer signaling.

[0267] When the base station indicates a non-periodic CSI report or a semi-persistent CSI report to the terminal through DCI, the terminal can determine whether a valid channel report can be performed through the indicated CSI report, and take into account the CSI calculation time required for the CSI report. The terminal can perform a valid CSI report from the uplink symbol after the Z symbol at the end of the last symbol included in the PDCCH, and the PDCCH includes a DCI indicating a CSI report of a non-periodic CSI report or a semi-persistent CSI report indicated by the DCI. The aforementioned Z symbol may vary with the following: the numerology corresponding to the downlink bandwidth part of the PDCCH including the DCI indicating the CSI report, the numerology corresponding to the uplink bandwidth part of the PUSCH sending the CSI report, or the type or characteristics of the channel information reported in the CSI report (report number, frequency band granularity, number of ports of RS, codebook type, etc.). In other words, in order to determine a certain CSI report as a valid CSI report (in order to determine the corresponding CSI report as a valid CSI report), the uplink transmission of the CSI report should not be performed before the Zref symbol including the timing advance. In this case, the Zref symbol is an uplink symbol where the cyclic prefix (CP) extends from the end of the last symbol that triggered the PDCCH by time T proc，CSI =(Z)(2048+144)·κ2 -μ ·T C In this article, the detailed value of Z can follow the description provided below, and T c =1 / (Δf max ·N f )·Δf max =480·10 3 Hz,N f =4096, κ=64, and μ can be numerology. In this case, μ can be agreed to use (μ PDCCH , μ CSI-RS , μ UL ), which results in the largest T proc，CSI , and μ PDCCH It can refer to the subcarrier spacing used for PDCCH transmission, μ CSI-RS It can refer to the subcarrier spacing used for CSI-RS transmission, and μ UL It can refer to the subcarrier spacing of the uplink channel used for uplink control information (UCI) transmission of CSI reporting. In another example, it can be agreed that μ is used (μ PDCCH , μ UL ), which results in the largest T proc，CSI .μ PDCCH and μ ULThe definition of will refer to the above description. For the convenience of the following description, satisfying the aforementioned conditions may be referred to as satisfying CSI report validity condition 1.

[0268] In addition, when the RS for channel measurement for the non-periodic CSI report indicated to the terminal through the DCI is a non-periodic RS, the terminal may perform a valid CSI report from the uplink symbol after the Z′ symbol from the end of the last symbol including the RS, wherein the aforementioned Z′ symbol may vary with: the numerology corresponding to the downlink bandwidth portion of the PDCCH including the DCI indicating the CSI report, the numerology corresponding to the bandwidth of the RS for channel measurement for the CSI report, the numerology corresponding to the uplink bandwidth portion of the PUSCH for sending the CSI report, or the type or characteristic of the channel information reported in the CSI report (the number of reports, the frequency band granularity, the number of ports of the RS, the codebook type, etc.). In other words, in order to identify a certain CSI report as a valid CSI report (in order to identify the corresponding CSI report as a valid CSI report), the uplink transmission of the CSI report should not be performed before the Zref′ symbol by including a timing advance. In this case, the Zref′ symbol is the symbol where the cyclic prefix (CP) passes time T′ from the end of the last symbol of the aperiodic CSI-RS or aperiodic CSI-IM triggered by the triggering PDCCH. proc，CSI =(Z′)(2048+144)·κ2 -μ ·T C In this article, the detailed value of Z′ can follow the description provided below, and T c =1 / (Δf max ·N f ), Δf max =480·10 3 Hz,N f =4096, κ=64, and μ can be numerology. In this case, μ can be agreed to use (μ PDCCH , μ CSI-RS , μ UL ), which results in the maximum T proc，CSI , and μ PDCCH It can refer to the subcarrier spacing used for PDCCH transmission, μ CSI-RS It can refer to the subcarrier spacing used for CSI-RS transmission, and μ UL It can refer to the subcarrier spacing of the uplink channel for UCI transmission used for CSI reporting. In another example, it can be agreed that μ is used (μ PDCCH , μ UL ), which results in the maximum T proc，CSI In this case, μ PDCCH and μUL The definition of will refer to the above description. For the convenience of the following description, satisfying the above conditions may be referred to as satisfying CSI report validity condition 2.

[0269] When the base station indicates the aperiodic CSI report of the aperiodic RS to the terminal through the DCI, the terminal can perform valid CSI reporting from the first uplink symbol that meets the following two time points: the time point after the Z symbol at the end of the last symbol included in the PDCCH including the DCI indicating the CSI report, and the time point after the Z' symbol at the end of the last symbol including the RS. That is, for the aperiodic CSI report based on the aperiodic RS, when both CSI report validity conditions 1 and 2 are met, the CSI report can be identified as a valid CSI report.

[0270] When the CSI reporting time indicated by the base station does not meet the CSI calculation time requirement, the terminal may recognize the CSI report as invalid and may not consider updating the channel information state of the CSI report.

[0271] The Z symbol and Z' symbol used to calculate the aforementioned CSI calculation time may follow [Table 20] and [Table 21]. For example, when the channel information reported in the CSI report includes broadband information, the number of RS ports is less than or equal to 4, the number of RS resources is one, and the codebook type is "typeI-SinglePanel" or the type of channel information to be reported (number of reports) is "cri-RI-CQI", and the Z symbol and Z' symbol may follow the values ​​Z1, Z1' of [Table 21]. This will be referred to as delay requirement 2. In addition, when the PUSCH including the CSI report does not include a TB or a hybrid automatic request (HARQ)-acknowledgement (ACK) and the CPU occupancy of the terminal is 0, the Z symbol and Z' symbol may follow the values ​​Z1, Z1' of [Table 20], which will be referred to as delay requirement 1. The above-mentioned CPU occupancy will be described in detail below. When the number of reports is "cri-RSRP" or "ssb-Index-RSRP", the Z symbol and Z' symbol may follow the values ​​Z1, Z1' of [Table 21]. 2 , Z 2 '. [Table 21] X 1 , X 2 , X 3 and X 4 It may refer to the terminal's capability (UE capability) for beam reporting time, and KB of [Table 21] 1 and KB 2 It may refer to the terminal's ability to change beam time. When it does not correspond to the type or characteristics of the channel information to be reported in the CSI report, the Z symbol and Z' symbol may follow the value Z of [Table 21] 2 , Z2 '.

[0272] [Table 20]

[0273]

[0274] [Table 21]

[0275]

[0276] When the base station indicates aperiodic / semi-permanent / periodic CSI reporting to the terminal, the base station can configure CSI reference resources in units of time slots to determine the reference time for measuring the channel information reported by the RS in the CSI report. For example, when it is indicated that CSI report #X is sent in uplink time slot n', the CSI reference resource of CSI report #X to be sent in uplink time slot n' can be defined as downlink time slot n. CSI-ref The downlink time slot n can be calculated as Consider the numerology of downlink and uplink μ DL and μ UL When the CSI report #0 to be sent in uplink slot n' is a semi-persistent or periodic CSI report, the slot interval n between downlink slot n and the CSI reference resource CSI-ref Can follow When a single CSI-RS resource is connected to the CSI report and follows When multiple CSI-RS resources are connected to the CSI report, it depends on the number of CSI-RS resources used for channel measurement. When the CSI report #0 transmitted in the uplink time slot n' is an aperiodic CSI report, the CSI report #0 can be calculated based on the CSI calculation time Z' of the channel measurement as The foregoing It may refer to the number of symbols included in one slot and is assumed in the NR system.

[0277] When the base station instructs the terminal to send a certain CSI report in uplink time slot n' through higher layer signaling or DCI, the terminal can report CSI by performing channel measurement or interference measurement on CSI-RS resources, CSI-IM resources and SSB resources that will be sent in the CSI reference resource slot of the CSI report sent in uplink time slot n' not later than between the CSI-RS resources, CSI-IM resources or SSB resources associated with the CSI report. The CSI-RS resources, CSI-IM resources or SSB resources associated with the CSI report may refer to: CSI-RS resources, CSI-IM resources or SSB resources configured by higher layer signaling and included in a resource set configured in a resource setting referenced by a report setting of a CSI report of the terminal; CSI-RS resources, CSI-IM resources or SSB resources referenced by a CSI report trigger state including parameters for CSI reporting; or CSI-RS resources, CSI-IM resources or SSB resources indicated by an ID of an RS group.

[0278] In an embodiment of the present disclosure, the CSI-RS / CSI-IM / SSB opportunity may refer to a transmission time point of a CSI-RS / CSI-IM / SSB resource determined by a higher layer configuration or a combination of a higher layer configuration and a DCI trigger. For example, a time slot in which a semi-persistent or periodic CSI-RS resource is to be transmitted may be determined based on a time slot period and a time slot offset configured by higher layer signaling, and the transmitted symbol in the time slot may be determined by referencing one of the resource mapping methods in the time slot in [Table 18] according to the resource mapping information resourceMapping. In another example, a time slot in which a periodic CSI-RS resource is to be transmitted may be determined based on a time slot offset of a PDCCH having a DCI including an indication channel report configured by higher layer signaling, and the transmitted symbol in the time slot may be determined by referencing one of the resource mapping methods in the time slot in [Table 18] according to the resource mapping information resourceMapping.

[0279] The above-mentioned CSI-RS timing can be determined by independently considering the transmission time point of each CSI-RS resource or by jointly considering the transmission time point of one or more CSI-RS resources included in the resource set, so that the following two analyses can be performed for the CSI-RS timing corresponding to each resource set configuration.

[0280] - Analysis 1-1: from the start point at which the earliest symbol of a specific resource among one or more CSI-RS resources included in a resource set configured in a resource setting referenced by a report setting configured for a CSI report is transmitted, to the end point at which the last symbol of the specific resource is transmitted; and

[0281] -Analysis 1-2: From the starting point where the earliest symbol of the CSI-RS sent at the earliest time point among all the CSI-RS resources included in the resource set configured in the resource setting referenced by the report setting configured for the CSI report is sent, to the end point where the last symbol of the CSI-RS sent at the last time point among the aforementioned CSI-RS resources is sent.

[0282] In the following, in the embodiments of the present disclosure, different applications are possible by considering two analyses of CSI-RS opportunities. In addition, both analyses for CSI-IM opportunities and SSB opportunities can be considered for use in CSI-RS opportunities, and the principle is similar to the above description, so no redundant description is given below.

[0283] In an embodiment of the present disclosure, the CSI-RS / CSI-IM / SSB timing for CSI report #X sent in uplink time slot n' refers to: the CSI-RS timing, CSI-IM timing, SSB timing of the CSI-RS resources, CSI-IM resources and SSB resources included in the resource set configured in the resource setting referenced by the report setting configured for CSI report #X, and the set of CSI-RS timing, CSI-IM timing and SSB timing no later than the CSI reference resources of CSI report #X sent in uplink time slot n'.

[0284] In an embodiment of the present disclosure, the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CSI-IM / SSB opportunities of CSI report #X transmitted in uplink slot n′ may be analyzed in the following two ways.

[0285] - Analysis 2-1: a timing set including the last CSI-RS timing among the CSI-RS timings of the CSI report #X transmitted in the uplink slot n', the last CSI-IM timing among the CSI-IM timings of the CSI report #X transmitted in the uplink slot n', and the last SSB timing among the SSB timings of the CSI report #0 transmitted in the uplink slot n'; and

[0286] - Analysis 2-2: The last opportunity among all CSI-RS opportunities, CSI-IM opportunities, and SSB opportunities of CSI report #X transmitted in uplink slot n'.

[0287] Hereinafter, in an embodiment of the present disclosure, two analyses of the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CSI-IM / SSB opportunities for CSI report #X sent in uplink slot n' may be considered for different applications. In view of the aforementioned two analyses (analysis 1-1 and analysis 1-2) for CSI-RS opportunity, CSI-IM opportunity and SSB opportunity, for "the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CSI-IM / SSB opportunities for CSI report #X sent in uplink slot n'", different applications are possible by considering four different analyses in an embodiment of the present disclosure (application of analysis 1-1 and analysis 2-1, application of analysis 1-1 and analysis 2-2, and application of analysis 1-2 and analysis 2-1).

[0288] The base station can indicate the CSI report, taking into account the amount of channel information that the terminal can calculate for the CSI report at the same time, that is, the number of channel information calculation units (CSI processing units: CPUs) of the terminal. When the number of CPUs that the terminal can calculate simultaneously is N CPU When the terminal does not expect to need more than N CPU The CSI report indication of the base station may be calculated based on the channel information of the base station, or it may not be considered that more than N CPU The channel information is calculated and the channel information is updated. CPU The terminal may report to the base station through a higher layer signaling, or the base station may configure through a higher layer signaling.

[0289] Assume that the CSI report indicated by the base station to the terminal occupies the total number of channel information that the terminal can calculate simultaneously N CPU All or some of the CPUs in the CSI are used for channel information calculation. When the number of CPUs required for each CSI report, for example, CSI report n (n = 0, 1, ..., N-1) is The number of CPUs required for a total of N CSI reports can be When the number of channel information calculations required by the terminal for multiple CSI reports at a certain point in time is greater than the number of CPUs that the terminal can calculate simultaneously, N CPU When the terminal updates the channel information of some CSI reports, the terminal may not consider updating the channel information of some CSI reports. Among the indicated multiple CSI reports, the CSI reports that do not consider updating the channel information may be determined based at least on the CPU time occupied by the channel information calculation required for the CSI report and the importance or priority of the channel information to be reported. For example, the CPU time occupied by the channel information calculation required for the CSI report may not consider the update of the channel information of the CSI report starting from the last time point, and the update of the channel information of the CSI report corresponding to the low priority of the channel information may not be given priority.

[0290] You can refer to [Table 22] to determine the CSI priority.

[0291] [Table 22]

[0292]

[0293] The priority value Pri in [Table 22] can be iCSI (y, k, c, s) to determine the CSI priority of the CSI report. Referring to [Table 22], the CSI priority value can be determined based on the type of channel information included in the CSI report, the time domain reporting characteristics of the CSI report (aperiodic, semi-persistent, periodic), the channel in which the CSI report is sent (PUSCH or PUCCH), the serving cell index, and the CSI report configuration index. The priority value Pri can be compared iCSI (y, k, c, s) to determine the CSI priority of the CSI report such that the CSI priority is higher for a CSI report with a lower priority value.

[0294] When the time occupied by the CPU for calculating the channel information required for the CSI report indicated by the base station to the terminal is the CPU occupancy time, the CPU occupancy time can be determined by considering the type of channel information included in the CSI report (number of reports), the time domain characteristics of the CSI report (non-periodic, semi-persistent, periodic), the time slots or symbols occupied by higher layer signaling or DCI indicating the CSI report, and part or all of the time slots or symbols occupied by the RS used for channel state measurement.

[0295] Fig. 9 An example of CPU occupancy time of a CSI report in which the number of reports included in the CSI report is not configured as “None” according to some embodiments of the present disclosure is shown.

[0296] Fig. 9 9-00 shows an example of the CPU occupancy time of a non-periodic CSI report in which the number of reports included in the CSI report is not configured as "none" according to some embodiments of the present disclosure. When the base station uses DCI format 0_1 ​​to send a non-periodic CSI report #X in uplink time slot n' through DCI indication, the CPU occupancy time 9-05 of the CSI report #X sent in uplink time slot n' can be defined as "from the next symbol of the last symbol occupied by PDCCH 9-10 including the DCI indicating the non-periodic CSI report #X0 to the last symbol occupied by PUSCH 9-15 including the CSI report #X sent in uplink time slot n'".

[0297] Fig. 99-20 shows an example of the CPU occupancy time of a periodic or semi-persistent CSI report in which the number of reports included in the CSI report is not set to "none" according to some embodiments of the present disclosure. When the base station sends a periodic or semi-persistent CSI report #X in uplink time slot n' through higher layer signaling or DCI indication using DCI format 0_1 ​​scrambled by SP-CSI-RNTI, the CPU occupancy time 9-25 of the CSI report #X sent in uplink time slot n' can be defined as "from the first symbol of the first transmitted CSI-RS / CSI-IM / SSB resource of the last CSI-RS / CSI-IM / SSB opportunity 9-35 among the CSI-RS / CS-IM / SSB opportunities corresponding to the CSI report #X sent in the uplink time slot n' to the last symbol occupied by the PUCCH or PUSCH 9-35 including the CSI report #X sent in the uplink time slot n'". Exceptionally, when the base station indicates the semi-persistent CSI report through DCI so that the terminal performs the first CSI report of the semi-persistent CSI report #X, the CPU occupancy time for the first CSI report can be defined as "from the next symbol of the last symbol occupied by the PDCCH including the DCI indicating the semi-persistent CSI report #X to the last symbol occupied by the PUSCH including the first CSI report". In this way, the causality of the time domain operation of the terminal can be guaranteed based on the time point of indicating the CSI report and the time point of starting the CPU occupancy time.

[0298] For example, the CPU occupancy time may follow the rules as shown in [Table 23].

[0299] [Table 23]

[0300]

[0301]

[0302] Fig.10 An example of CPU occupancy time of a CSI report in which the number of reports included in the CSI report is set to “none” according to some embodiments of the present disclosure is shown.

[0303] Fig.1010-00 shows an example of the CPU occupancy time of a non-periodic CSI report in which the number of reports included in the CSI report is set to "none" according to some embodiments of the present disclosure. When the base station uses DCI format 0_1 ​​to send a non-periodic CSI report #X in uplink time slot n' through DCI indication, the CPU occupancy time 10-05 of the CSI report #X sent in the uplink time slot n' can be defined as "from the next symbol of the last symbol occupied by PDCCH10-10 including DCI indicating non-periodic CSI report #0 to the symbol at which the CSI calculation ends". The above-mentioned symbol at which the CSI calculation ends may refer to: the last symbol after the CSI calculation time Z10-15 of the last symbol occupied by the PDCCH including DCI indicating CSI report #0; and the symbol after the CSI calculation time Z'10-25 of the last symbol of the latest CSI-RS / CSI-IM / SSB opportunity 10-20 of the CSI report #0 sent in the uplink time slot n'.

[0304] Fig.10 10-30 shows an example of the CPU occupancy time of a periodic or semi-persistent CSI report in which the number of reports included in the CSI report is set to "none" according to some embodiments of the present disclosure. When the base station sends a periodic or semi-persistent CSI report #X in an uplink time slot n' through higher layer signaling or DCI indication using DCI format 0_1 ​​scrambled by SP-CSI-RNTI, the CPU occupancy time 10-35 of the CSI report #X sent in the uplink time slot n' can be defined as "the symbol after the CSI calculation time Z'10-45 from the first symbol of the first transmitted CSI-RS / CSI-IM / SSB resource of each CSI-RS / CSI-IM / SSB opportunity 10-40 corresponding to the CSI report #X sent in the uplink time slot n'".

[0305] For example, the CPU occupancy time may follow the rules as shown in [Table 24].

[0306] [Table 24]

[0307]

[0308] In an unlicensed frequency band (e.g., 5 GHz), a communication device (base station or terminal) to perform communication may perform a channel access procedure or listen before talk (LBT) before signal transmission, and perform signal transmission according to the result of the channel access procedure. For example, when the result of the channel access procedure is that the unlicensed frequency band is determined to be in an idle state, the communication device may transmit a signal, but when the unlicensed frequency band is determined not to be in an idle state, the communication device may not be able to transmit a signal.

[0309] The channel access procedure may include: measuring, by the communication device, the strength of a signal received through an unlicensed band within a time calculated according to a set or predefined rule; and comparing the strength of the signal with a predefined threshold, or with a threshold calculated by a function of at least one parameter including the channel bandwidth, the bandwidth of the signal in which the transmitted signal is transmitted, and / or the strength of the transmitted power, thereby determining the idle state of the unlicensed band.

[0310] For example, the communication device can measure the strength of the received signal within Xμs (e.g., 16μs or 25μs) before the time point when the signal is about to be sent, and when the measured signal strength is less than a predefined or calculated threshold T (e.g., -72dBm), the communication device can determine that the unlicensed band is in an idle state and send a signal. The maximum time that a signal can be sent by occupying a channel after a channel access procedure may be subject to the maximum channel occupancy time (MCOT) defined by the country, region, and frequency band of each unlicensed band. The above maximum time can also be constrained according to the type of communication device (e.g., a base station or terminal, or a master device or a slave device). For example, in Japan, in the 5GHz unlicensed band, for an unlicensed band determined to be in an idle state after a channel access procedure, a base station or terminal can occupy the channel and send a signal without performing an additional channel access procedure within a maximum of 4ms.

[0311] More specifically, the channel access procedure of the base station or terminal in the NR system can be roughly divided into four categories. For example, there may be a first category in which the channel access procedure is not performed, a second category in which the channel access procedure is performed without random compensation, a third category in which the channel access procedure is performed by random compensation in a fixed-size contention window, and a fourth category in which the channel access procedure is performed by random compensation in a variable-size contention window. The channel access procedure categories can be divided into the following channel access procedure types:

[0312] - Type 1: uplink / downlink signals or channels are transmitted after performing a channel access procedure during a variable time period;

[0313] - Type 2: uplink / downlink signals or channels are transmitted after performing a channel access procedure during a fixed time period;

[0314] - Type 3: Sending a downlink or uplink signal or channel without performing a channel access procedure

[0315] According to an embodiment of the present disclosure, the third category and the fourth category of type 1, the second category of type 2, and the first category of type 3 may be examples. For type 2 or the second category in which a channel access procedure is performed at a fixed time, it may be classified into one or more types according to the fixed time during which the channel access procedure is performed. For example, type 2 may be classified into: a type (type 2-1) in which a channel access procedure is performed at a fixed time Aμs (e.g., 25μs); and a type (type 2-2) in which a channel access procedure is performed at a fixed time Bμs (e.g., 16μs).

[0316] A base station or terminal that is to perform signal transmission in an unlicensed band may determine a channel access procedure type (or scheme) according to the type of signal or channel to be transmitted. For example, when a base station transmits a downlink signal including a downlink data channel in an unlicensed band, the base station may perform a channel access procedure of type 1. When a base station transmits a downlink signal or channel (e.g., a synchronization signal or a downlink control channel) that does not include a downlink data channel in an unlicensed band, the base station may perform a channel access procedure of type 2 and transmit the signal or channel.

[0317] In this case, the scheme of the channel access procedure can be determined according to the transmission length of the signal or channel to be transmitted in the unlicensed band or the duration or period length in which the unlicensed band is used by occupation. Generally speaking, in type 1, it takes longer to perform the channel access procedure than in type 2. Therefore, when the base station or terminal transmits a signal during a short time period or reference time (e.g., X ms or Y symbols) or shorter time period, the base station or terminal can perform a channel access procedure of type 2. On the other hand, when the base station or terminal transmits a signal during a long time period or reference time (e.g., X ms or Y symbols) or longer time period, the base station or terminal can perform a channel access procedure of type 1. That is, the time for using the unlicensed band by occupation can vary with the type of channel access procedure for the unlicensed band.

[0318] In various embodiments of the present disclosure, the parameter value corresponding to the channel access priority type (e.g., the delay duration, contention window value or size CW corresponding to the determined channel access priority p) may be determined as shown in [Table 25]. p The collection and minimum value of CW min，p , the maximum value of the contention window CW max，p And the maximum channel occupancy duration T mcot，p). [Table 25] shows an example of parameters of the channel access priority type for the downlink.

[0319] For example, a base station that wants to send a downlink signal in an unlicensed band may f +m p *T sl When the base station is to perform a channel access procedure according to channel access priority type 3 (p=3), the delay duration T required for performing the channel access procedure is f +m p *T sl For the size, you can use m p =3Set T f +m p *T sl In this paper, T f Fixed to 16us, where the first time T sl Need to be in idle state and at time T f Time T sl The remaining time T f -T sl During this period, the base station may not perform the channel access procedure. In this case, even when the base station f -T sl The channel access procedure may be performed within a certain time frame, or the result of the channel access procedure may not be used. f -T sl It may be a delay in the time of performing the channel access procedure in the base station.

[0320] When in m p *T sl During the period, when it is determined that the unlicensed band is in an idle state, N=N-1. N can be selected as the contention window value CW at the time point of performing the channel access procedure between 0 and p For channel access priority type 3, the minimum contention window value and the maximum contention window value may be 15 and 63, respectively. When the unlicensed band is determined to be in an idle state during the delay duration and the additional duration in which the channel access procedure is performed, the base station may mcot，p During this period, a signal is transmitted in an unlicensed band. Although the description is based on the downlink channel access priority for convenience, the channel access priority classification of [Table 25] can be used for the uplink as well, or a different channel access priority classification can be used for uplink transmission.

[0321] [Table 25]

[0322]

[0323] In the NR system, one carrier can use a maximum frequency band of about 100MHz in a frequency band of about 7GHz or lower. In this case, one carrier can use a maximum frequency band of about 400MHz in a frequency band of about 7GHz or higher or in an ultra-high frequency band (mmWave). Part of the unlicensed band (e.g., an unlicensed band near 5GHz) can be divided into 20MHz channels, and various communication devices can perform channel access procedures by using each channel divided in units of 20MHz. Therefore, an NR system that performs communication in an unlicensed band using a broadband (e.g., a bandwidth wider than about 20MHz bandwidth) can perform a channel access procedure in units of 20MHz, thereby using the unlicensed band fairly with other devices and / or systems. In other words, in a base station and a terminal that perform communication by using an unlicensed carrier or cell or a bandwidth portion of the carrier or cell, when the bandwidth of the carrier or cell or the bandwidth portion is greater than about 20MHz, the bandwidth or the bandwidth portion (hereinafter referred to as the bandwidth portion) can be divided into one or more subbands, and the channel access procedure can be performed in units of subbands or subband groups. In this case, the subbands may be divided based on the size of the carrier bandwidth or bandwidth portion.

[0324] For example, the base station may divide the bandwidth portion into a plurality of LBT sub-bands based on the size of the bandwidth portion set for the terminal. That is, a bandwidth portion of approximately 80 MHz may be divided into four LBT sub-bands based on 20 MHz. The size of the LBT sub-band may be equal to the size of the unlicensed band channel, or may be a multiple thereof. The size of the LBT sub-band may be set by a higher layer signal. The size of the LBT sub-band may be defined as the size of the bandwidth or the number of PRBs. That is, the size of the LBT sub-band may be equal to the size of the 5 GHz unlicensed band channel, approximately 20 MHz, or may be a multiple thereof, approximately 40 MHz or approximately 80 MHz. In another example, the size of the LBT sub-band may be defined as X PRBs, wherein the bandwidth corresponding to the X PRBs may be equal to or less than the size of the unlicensed band channel, and the bandwidth may be approximately 20 MHz. Similarly, the size of the LBT sub-band may be defined as Y and / or Z PRBs corresponding to a bandwidth that is the same as or smaller than a bandwidth of approximately 40 MHz or 80 MHz. In this case, X, Y, and Z of each bandwidth may be predefined between the base station and the terminal. The size of at least one of the LBT sub-bands may be different from the size of the other LBT sub-bands. For example, when the size of the carrier bandwidth or bandwidth portion is 50MHz, the carrier bandwidth or bandwidth portion can be divided into three LBT sub-bands. The sizes of the three LBT sub-bands can be approximately 20MHz, approximately 20MHz, and approximately 10MHz, or approximately 10MHz, approximately 20MHz, and approximately 20MHz, respectively. The number of LBT sub-bands and / or the size of each LBT sub-band are merely examples, and various examples are possible. That is, a carrier bandwidth or bandwidth portion of 50MHz can be divided into an LBT sub-band of approximately 40MHz and an LBT sub-band of approximately 10MHz. In the aforementioned example, the size of each LBT sub-band can be expressed as the number of PRBs.

[0325] This will be referenced below Fig.11 Describe in more detail. Fig.11 An example in which LBT subbands are divided in a wireless communication system according to various embodiments of the present disclosure is shown.

[0326] Fig.11It may be a view showing a situation where a terminal performs communication with a base station through two unlicensed carriers or cells 11-00 and 11-60 (hereinafter referred to as cells #0 and cells #1). In this case, the sizes of the carrier bandwidths 11-05 and 11-65 of cells #0 and cells #1 may be the same or different from each other. In addition, the terminal may be configured with bandwidth parts 11-10 and 11-70 that are the same or smaller than the bandwidths 11-05 and 11-65 of cells #0 and cells #1. In this case, the configuration information (e.g., the size of the bandwidth parts) of the bandwidth parts 11-10 and 11-70 may be the same or different from each other. The base station may divide the carrier bandwidth 11-05 of cell #0 into N LBT subbands, wherein the carrier bandwidth 11-65 or bandwidth part 11-70 of cell #1 may not be divided into LBT subbands separately, or may be divided into one LBT subband for performing a channel access procedure. In this case, the base station may divide the bandwidth part 11-10 of the terminal into M LBT subbands in cell #0. The base station can perform channel access procedures including 11-25, 11-35, 11-45 and 11-55, and perform a channel access procedure 11-75 for the LBT subband in cell #0 11-00 and subband #0 or a carrier or bandwidth portion 11-70 in cell #1 11-60, and can perform communication through the LBT subband determined to be in an idle state. Therefore, since the resource area that the terminal can send and receive may change according to the result of the channel access procedure for each LBT subband of the base station, the terminal needs to receive the result of the channel access procedure performed by the base station for each subband, and in this way, the terminal can correctly determine the frequency resource area for uplink / downlink data channel transmission / reception.

[0327] To this end, the base station may send the result of the channel access procedure to the terminal via a downlink control channel. Because the result of the channel access procedure of the base station is information commonly applied to all terminals configured with a bandwidth portion including the LBT subband, the base station sends the result of the channel access procedure for each subband via a cell-common or group-common (GC) DCI, thereby minimizing the signaling necessary to send the aforementioned information to the terminal. In this case, the result of the channel access procedure of the base station may be sent to the terminal via a terminal (UE)-specific DCI.

[0328] In various embodiments of the present disclosure, information indicating the result of the channel access procedure of the base station may be referred to as "LBT result information". In this case, LBT result information may be defined for each LBT subband, and the LBT result information may include information indicating the result of the channel access procedure for each LBT subband. LBT result information may also be defined for each carrier or cell, and the LBT result information may include information indicating the result of the channel access procedure for each carrier or cell. When a carrier or cell includes multiple subbands, LBT result information may also be defined for each carrier or cell and each LBT subband, and the LBT result information may include information indicating the result of the channel access procedure for each carrier or cell and each LBT subband.

[0329] The base station can send the result of the channel access procedure for each LBT subband to the terminal by using a bitmap. For example, the result of the channel access procedure of the cell #0 11-00 including four LBT subbands can be sent to the terminal by a 4-bit bitmap that can be configured in sequence from LBT subbands 11-20 with low LBT subband indexes to LBT subbands 11-50 with high LBT subbands. Each bit can indicate the result of the channel access procedure of the base station for each LBT subband. For example, bit 0 may mean that the LBT subband is not in an idle state, and bit 1 may mean that the LBT subband is in an idle state. The aforementioned bit values ​​are examples and can be set in reverse. Sending the result of the channel access procedure for each LBT subband to the terminal can be represented by: sending to the terminal whether the base station occupies the LBT subband (bit 1) or does not occupy the LBT subband (bit 0); sending to the terminal whether the base station sends a downlink signal through the LBT subband (bit 1) or does not send a downlink signal through the LBT subband (bit 0). In this case, sending the result of the channel access procedure for each LBT subband to the terminal can be represented by: sending to the terminal whether the base station sends a downlink signal through the LBT subband, but the downlink signal is punctured (bit 0), or the downlink signal matches the LBT subband rate (or does not send) (bit 1). That is, when the base station sends the result of the channel access procedure for each LBT subband to the terminal, this can mean that the base station can provide the terminal with information that allows the terminal to avoid receiving control signals, control channels or data channels in the LBT subband that fail to access the channel. At the same time, the result of the channel access procedure for each LBT subband is sent to the terminal through a bitmap. As an example, the base station can represent the combination of the results of the channel access procedure for the corresponding LBT subband as a bit string and send the results therein to the terminal. When channel access using continuous LBT subbands is allowed, for example, when channel access using discontinuous LBT subbands (such as LBT subbands #0 and #2) is not allowed, compared with sending the result of the channel access procedure to the terminal through a bitmap, sending the combination of the results of the channel access procedure for the corresponding LBT subband as a bit string to the terminal can minimize the bits required for information transmission.

[0330] The base station may send information about the channel occupancy time 11-90 and 11-95 of the base station and the result of the channel access procedure to the terminal through the downlink control channel. In this article, the channel occupancy time may be the time when the base station can occupy the unlicensed band, and the occupancy of the unlicensed band is initiated after executing the channel access procedure without performing an additional channel access procedure. The channel occupancy time information may be expressed as the channel occupancy start time and / or the channel occupancy end time of the base station, or the corresponding number of time slots and / or the number of symbols, time slot index and / or symbol index corresponding to the channel occupancy start time and / or the channel occupancy end time, or the number of time slots or symbols from the time slot or symbol sent by the downlink control channel for sending the channel occupancy time information to the channel occupancy end slot or symbol. At the same time, the base station may at least send the time slot format indicator information for the time slot in the channel occupancy time, and the terminal may implicitly determine the channel occupancy time information of the base station from the time slot format indicator information. The channel occupancy time information and the LBT result information may be sent through the same downlink control channel or different downlink control channels.

[0331] At the same time, the uplink signal or channel sent during the channel occupancy time of the base station starting channel occupancy after executing the type 1 channel access procedure can be sent after executing the type 2 or type 3 channel access procedure.

[0332] In the following disclosure, the time period during which a base station or terminal is allowed to send and receive radio signals through the above-mentioned channel access procedure, etc., will be defined as "channel occupation duration", which can be replaced by other similar terms in its actual application, such as non-empty symbols (time slots / durations), occupied duration, etc. On the other hand, the time period during which a base station or terminal is prohibited from sending and receiving radio signals through the above-mentioned channel access procedure, etc., will be defined as "channel non-occupancy duration", which can be replaced by other similar terms in its actual application, such as empty symbols (time slots / durations), unoccupied duration, etc. The channel occupation duration and the channel non-occupancy duration can be mutually exclusive in at least the same unit of frequency resources (for example, a unit frequency resource of a channel access procedure of an LBT or a sub-band LBT), which means that in at least a unit frequency resource, resources that do not belong to the channel occupation duration can be understood as channel non-occupancy duration, and resources that do not belong to the channel non-occupancy duration can be understood as channel occupation duration.

[0333] In the present disclosure, by providing a base station or terminal with methods such as determining a valid CSI report based on channel occupancy or channel non-occupancy, determining CSI reference resources, determining CPU occupancy time, etc., the efficiency of CSI report indication and channel state measurement of the base station and terminal can be improved.

[0334] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings. In the description of the present disclosure, when it is determined that the subject matter of the present disclosure will not cause unnecessary ambiguity, the specific description of the relevant function or structure can be skipped. The terms used in this article are defined in consideration of the functions in the present disclosure, and the terms can be changed according to the intention or practice of the user or operator. Therefore, the terms should be defined based on the overall disclosure.

[0335] Although the aforementioned examples have been described through multiple embodiments in the present disclosure, these examples are not independent, and one or more embodiments of the present disclosure may be applied simultaneously or in combination.

[0336] [First embodiment: Method for determining a valid downlink time slot and CSI reference resource according to channel occupancy or channel non-occupancy]

[0337] In the first embodiment of the present disclosure described below, a method of determining a valid downlink time slot and a CSI reference resource according to channel occupancy or channel non-occupancy will be described.

[0338] As described above, when emergency communications in the licensed frequency band are not considered to be preempted, the base station can always guarantee uplink / downlink occupancy based on its autonomous determination. In this case, the base station and the terminal can assume that the downlink time slot nn CSI-ref As a CSI reference resource for CSI reporting performed in uplink time slot n'. In this case, the base station and the terminal can identify the validity of the CSI reference resource based on the following conditions to determine whether the downlink time slot is a valid downlink time slot. That is, in this example, a time slot that satisfies both condition 1 and condition 2 can be determined as a valid downlink time slot. When it is determined that the downlink time slot is not a valid downlink time slot, the most recent valid downlink time slot among the previous downlink time slots can be assumed to be a CSI reference resource.

[0339] Condition 1) A valid downlink time slot needs to include downlink symbols or flexible symbols configured via at least one higher layer. That is, when all symbols in a time slot are configured as uplink symbols, the time slot may not be a valid downlink time slot.

[0340] Condition 2) The valid downlink time slot should not overlap with the measurement gap set for a certain terminal to perform handover measurement, etc. That is, the terminal may not determine a time slot including at least one of the OFDM symbols included in the measurement gap set for the terminal as a valid downlink time slot.

[0341] At the same time, when channel occupancy cannot be always guaranteed due to the channel access procedure in the unlicensed band or when emergency communication in the licensed band is considered to be preempted, uplink / downlink occupancy may not be always guaranteed. Moreover, in this case, the base station and the terminal may assume that the downlink time slot nn CSI-ref As a CSI reference resource for CSI reporting performed in uplink time slot n'. Meanwhile, in this case, when the base station and the terminal determine whether the downlink time slot is a valid downlink time slot by determining the validity of the CSI reference resource, additional conditions need to be considered as well as conditions 1 and 2 considering the uncertainty of channel occupancy.

[0342] One of the additional conditions for determining the valid downlink time slot based on the channel occupancy uncertainty may be a correlation between the downlink symbols and flexible symbols configured via a higher layer and the channel occupancy duration in the downlink time slot.

[0343] Fig.12 An example of effective downlink time slot determination based on correlation between downlink symbols and flexible symbols configured via a higher layer and channel occupancy duration in a downlink time slot according to some embodiments of the present disclosure is shown. Fig.12 , the relationship between the downlink OFDM symbols 12-05 and 12-55 and the flexible OFDM symbols 12-10 and 12-60 configured via a higher layer in a time slot and the channel occupancy duration 12-20 and 12-70 (or channel non-occupancy duration) can be defined as Condition 3 or Condition 4, and according to one of the methods, a CSI report validity check can be performed on the time slot.

[0344] Condition 3) When all downlink OFDM symbols 12-05 (or alternatively, flexible OFDM symbols 12-10) configured via a higher layer in a time slot are included in the channel occupied duration 12-20, the time slot may be determined as a valid downlink time slot, and when at least one of the downlink OFDM symbols 12-05 (or alternatively, flexible OFDM symbols 12-10) configured via a higher layer in a time slot is included in the channel non-occupied duration, the time slot may not be determined as a valid downlink time slot. This is intended not to perform CSI reporting for the corresponding time slot, because in the above case, the entire downlink transmission or a part thereof planned by the base station in the time slot has become impossible.

[0345] Condition 4) When at least one of the downlink OFDM symbols 12-55 (or additionally, the flexible OFDM symbol 12-60) configured via a higher layer in a time slot is included in the channel occupied duration 12-70, the time slot may be determined as a valid downlink time slot, and when all downlink OFDM symbols 12-55 (or additionally, the flexible OFDM symbol 12-70) configured via a higher layer in a time slot are included in the channel non-occupied duration, the time slot may not be determined as a valid downlink time slot. This is intended not to perform CSI reporting for the corresponding time slot, because in the above case, the downlink transmission planned by the base station in the time slot has become impossible.

[0346] One of the additional conditions for determining the valid downlink time slot based on the channel occupancy uncertainty may be the correlation between the transmission / reception time point of the CSI-RS or CSI-IM resource referenced by the CSI report and the channel occupancy duration.

[0347] Fig.13 Another example of valid downlink time slot determination according to some embodiments of the present disclosure is shown.

[0348] refer to Fig.13 , for CSI report 13-00 performed in uplink time slot n', it is assumed according to the aforementioned rule that CSI reference resource 13-30 is set at a time earlier than 13-00. The terminal may measure the most recent CSI-RS or CSI-RS and CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 transmitted before the CSI reference resource in the CSI-RS or CSI-RS / CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 indicated by at least one resource setting 13-05 referenced by the CSI report 13-00, and thus generate the CSI for the CSI report 13-00. In this case, when the base station and the terminal determine the validity of the CSI reference resources and determine whether the downlink time slot is a valid downlink time slot by considering the channel occupancy uncertainty, the relationship between the transmission timing of the CSI-RS or CSI-RS / CSI-IM pairs 13-10, 13-15, 13-20 and 13-25 and the channel occupied duration (or channel non-occupied duration) can be defined by condition 5 or condition 6, and the CSI report validity check can be performed for the time slot according to one of the aforementioned methods.

[0349] Condition 5) When the most recent CSI-RS or CSI-RS and CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 transmitted before the CSI reference resource is transmitted in a time slot among the CSI-RS or CSI-RS / CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 indicated by at least one resource setting 13-05 referenced by the CSI report 13-00, the terminal can determine the time slot as a valid downlink time slot. When the CSI-RS or CSI-RS / CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 are actually transmitted within the channel occupancy duration based on both conditions 3 and 4, the time slot can be determined as a valid downlink time slot. This is intended to ensure that the terminal can complete channel measurement and interference measurement within a certain time period, taking into account the characteristics of the unlicensed band of the temporarily occupied channel.

[0350] Condition 6) When at least one CSI-RS or at least one CSI-RS / CSI-IM pair is sent among the most recent CSI-RS or CSI-RS / CSI-IM pairs 13-10, 13-15, 13-20, and 13-25 sent before the CSI reference resource indicated by all resource settings 13-05 referenced by the CSI report 13-00 in a time slot, the terminal can determine the time slot as a valid downlink time slot. When at least one CSI-RS or at least one CSI-RS / CSI-IM pair is actually sent within the channel occupancy duration based on both conditions 3 and 4, the time slot can be determined as a valid downlink time slot. This is intended to take into account the case where CRI indicates one CSI-RS resource to perform RSRP reporting for each CSI-RS resource, and the case where CRI indicates a pair of CSI-RS / CSI-IM resources to perform CSI reporting based on a pair of channel measurements / interference measurements. When the minimum CSI reporting requirement is established, this is also intended to perform CSI reporting by considering the characteristics of the unlicensed band of the temporarily occupied channel.

[0351] In the description of the present disclosure, a flexible OFDM symbol configured via a higher layer may refer to an OFDM symbol that can be indicated by a slot format indicator (SFI) in a DCI as a downlink OFDM symbol, an uplink OFDM symbol, or one of a slot. At the same time, in the description of the present disclosure, a downlink symbol or a flexible symbol configured via a higher layer has been used to determine the validity of a CSI reference resource and / or a CSI report, but for an unlicensed band, due to the execution of a channel access procedure, there may not be a fixed configuration for downlink symbols, flexible symbols, or uplink symbols via a higher layer. In other words, the terminal may not receive configuration information for downlink symbols, flexible symbols, or uplink symbols via a higher layer, but in this case as well, the method for determining a valid downlink time slot according to the present disclosure may be applied. For example, the terminal may configure or determine all symbols as flexible symbols, and in this way, the validity of a CSI reference resource and / or a CSI report may be determined by one or a combination of a plurality of the above conditions.

[0352] In the above example, one or more of conditions 3 to 6 may be used in combination. That is, in the current example, the base station and the terminal may assume that both conditions 1 and 2 are satisfied, and a time slot that additionally satisfies at least one of conditions 3 to 6 (or a certain subset such as simultaneously satisfying condition 3 and condition 5) is a valid downlink time slot.

[0353] When there is no valid downlink timeslot for CSI reference resources for CSI reporting setup in one serving cell, the terminal may skip the corresponding CSI reporting (CSI reporting to be performed for the serving cell in uplink timeslot n').

[0354] As described above, for a CSI report sent in uplink time slot n', the downlink time slot n' may be CSI_ref The nearest valid downlink time slot among the time slots or its previous time slots is defined as the CSI reference resource. In this case, the terminal and the base station can skip the CSI report of the CSI reference resource according to the following rules. In the embodiments of the present disclosure, the skipping of the CSI report can be replaced by various expressions such as the omission, discarding or non-updating of the CSI report, but in order not to confuse the subject of the description, no redundant description will be provided.

[0355] Rule 1) After events such as CSI report setup or re-set, SCell activation, BWP change / activation, semi-persistent CSI activation, etc., when at least one CSI-RS or a pair of CSI-RS / CSI-IM transmission / reception opportunities exist no later than the CSI reference resource, the terminal can perform CSI reporting, otherwise the terminal can skip CSI reporting. This is intended to reduce the burden on the terminal by avoiding operations for situations where meaningless CSI reports are issued according to various settings or environmental changes.

[0356] Rule 2) When discontinuous reception (DRX) is set so that the terminal performs reception only during DRX active time, the terminal can perform CSI reporting when there is at least one CSI-RS or a pair of CSI-RS / CSI-IM transmission / reception opportunities during the DRX active time; otherwise, the terminal can skip CSI reporting. This is intended to ensure the idle time of the terminal regardless of CSI reporting during DRX inactive time.

[0357] Rule 3) In CSI feedback calculation, for the terminal, it can be ensured that the non-zero power (NZP) CSI-RS resources for channel measurement and the CSI-IM for interference measurement or the NZP CSI-RS for interference measurement do not overlap. This is intended to uniformly maintain the channel measurement and interference measurement complexity of the terminal for CSI reporting.

[0358] Rule 4) When some of the OFDM symbols for transmitting CSI-RS or CSI-IM associated with a certain CSI report are included in the channel non-occupied duration, the terminal may skip the CSI report (or may not select the CSI indicating the CSI-RS or CSI-IM included in the channel non-occupied duration or may not update the CSI related to the CSI). This is intended to reduce the burden on the terminal by preventing the associated CSI report from being performed when the channel occupancy duration for the transmission of the CSI-RS or CSI-IM cannot be ensured due to the channel access procedure.

[0359] Rule 5) When all OFDM symbols for transmitting CSI-RS or CSI-IM associated with a certain CSI report are included in the channel non-occupied duration and therefore there are no available CSI-RS and CSI-IM before the CSI reference resource of the CSI report, the terminal may skip the CSI report (or skip the CSI report when there are no CSI-RS and CSI-IM in the channel occupied duration including the CSI reference resource before the CSI reference resource of the CSI report). This is intended to reduce the burden on the terminal by preventing the relevant CSI report from being performed when the channel occupied duration for the transmission of CSI-RS or CSI-IM cannot be ensured due to the channel access procedure, and therefore CSI may not be obtained.

[0360] Rule 6) When the CSI reference resource of a CSI report is not included in the channel occupancy duration, the CSI report can be skipped. This is intended to reduce the burden on the terminal by preventing CSI reporting for resources that are not fixed as the channel occupancy duration due to the channel access procedure.

[0361] When rules 1 to 6 are applied, the base station and the terminal may determine whether to skip the CSI report based on a combination of some rules. For example, the terminal may always apply rules 1 to 3 according to independent conditions such as CSI report setting or resetting, SCell activation, BWP change / activation, semi-persistent CSI activation, DRX setting, etc. The terminal may also apply at least one of rules 4 to 6 in addition according to the determination of the channel occupancy duration or the channel non-occupancy duration. In particular, rules 4 to 6 may be applied together with mutual association. For example, it may be agreed that when the CSI reference resource 13-30 of a certain CSI report 13-00 and the CSI-RS / CSI-IM resources 13-10, 13-15, 13-20 and 13-25 transmitted before the CSI reference resource 13-30 are not included in the X channel occupancy duration (or X ms / symbol / time slot) due to the simultaneous application of rules 5 and 6, the terminal skips the CSI report. This can be understood as that when the CSI reference resource 13-30 of a certain CSI report 13-00 and the CSI-RS / CSI-IM resources 13-10, 13-15, 13-20, and 13-25 transmitted before the CSI reference resource 13-30 are included in the X channel occupancy duration (or X ms / symbol / time slot) as in 13-70, the terminal performs the corresponding CSI report. In this example, X can be a constant preset or configured via a higher layer, such as 1 or 2. This is intended to reduce the burden on the terminal by preventing CSI reporting from being performed on resources that are not fixed as the channel occupancy duration due to the channel access procedure. The combination of rules 4 to 6 can be configured in various ways, but all possible examples will not be listed to avoid confusing the subject of the description.

[0362] Although the channel occupation duration or channel non-occupancy duration caused by the channel access procedure of the unlicensed band in Rules 4 to 6 has been described as an application condition, this can be extended to various situations, such as channel non-use due to GC PDCCH, or channel non-use due to emergency communication preemption.

[0363] In the description of the present disclosure, when "guaranteeing condition A for the terminal", it can be understood as various meanings, such as "not expecting condition A not to be satisfied", "not performing operations related to condition A when condition A is not satisfied", "ignoring the indication of the base station related to condition A when condition A is not satisfied", etc. In addition, in order not to confuse the subject of the description, the description will not be repeated.

[0364] [Second Embodiment: Method for Calculating CPU Occupancy Based on Channel Occupancy or Channel Non-Occupancy]

[0365] The second embodiment of the present disclosure may provide a CPU occupation method according to channel occupation or channel non-occupancy.

[0366] Fig.14 An example of CPU occupancy calculation according to some embodiments of the present disclosure is shown.

[0367] Fig.14 The CPU occupancy time of the non-periodic CSI report in which the number of reports included in the CSI report #X is not set to "none" is shown. When the base station indicates that the non-periodic CSI report #X is sent in the uplink time slot n' using DCI format 0_1 ​​through DCI 14-05, one of the following various CPU occupancy time calculation methods can be applied according to the following situations: whether the uplink / downlink related to the PUSCH or CSI-RS / CSI-IM CSI report #X is a licensed band or an unlicensed band, or whether channel occupancy is always possible or conditional channel occupancy is possible (i.e., when a certain frequency / time resource can be a channel occupied duration and a channel non-occupied duration).

[0368] Method 1) When channel occupancy for uplink / downlink in the licensed band is always possible, the CPU occupancy time #114-20 of the CSI report #X 14-10 transmitted in the uplink time slot n' can be defined as "from the next symbol of the last symbol occupied by the PDCCH 14-05 including the DCI indicating the non-periodic CSI report #X to the last symbol occupied by the PUSCH 14-15 including the CSI report #X transmitted in the uplink time slot n'".

[0369] Method 2) Method 2 is a method of calculating the CPU occupancy time in the following case: a portion of the uplink resources for a non-periodic CSI report in which reportQuantity is not set to "none" overlaps with the channel non-occupancy duration. When the complete PUSCH resource 14-10 or a portion thereof for CSI report #X transmitted in the uplink time slot n' overlaps with the channel non-occupancy duration 14-15 due to the channel access procedure, the CPU occupancy time #2 14-30 for CSI report #X can be defined as "from the next symbol of the last symbol occupied by the PDCCH 14-05 including the DCI indicating the non-periodic CSI report #X to the starting symbol of the channel non-occupancy duration (or the first symbol after determining that the channel non-occupancy duration overlaps with the PUSCH resource 14-10)". This is intended to ensure CPU space for executing another CSI report by canceling the CPU occupancy of the corresponding CSI report when it is determined that a certain CSI report may not be executed due to channel non-occupancy. In another example, when the complete PUSCH resource 14-10 or a part thereof for CSI report #X sent in the uplink time slot n' overlaps with the channel non-occupancy duration 14-15 due to the channel access procedure, the CPU occupation time #3 14-40 for CSI report #X can be defined as "from the next symbol of the last symbol occupied by the PDCCH 14-05 including the DCI indicating the non-periodic CSI report #X to the first symbol of the PUSCH resource 14-10". This is intended to guarantee CPU space for executing another CSI report by canceling the CPU occupation before the PUSCH transmission of the corresponding CSI report when it is determined that a certain CSI report may not be executed due to channel non-occupancy. In another example, when the complete PUSCH resource 14-10 or a part thereof for CSI report #X sent in the uplink time slot n' overlaps with the channel non-occupancy duration 14-15 due to the channel access procedure, the CPU occupation time #4 14-50 for CSI report #X can be defined as canceling the entire existing CPU occupation 14-20. This is intended to guarantee CPU space for executing another CSI report by releasing the entire CPU occupation cycle of the corresponding CSI report when it is determined that a certain CSI report may not be executed due to channel non-occupancy.

[0370] Method 3) Method 3 is a method for calculating the CPU occupancy time in the following case: a portion of the uplink resources for periodic or semi-persistent CSI reports where reportQuantity is not set to "None" overlaps with the channel non-occupancy duration. The detailed method of Method 3 is similar to Method 2, but as the starting point of CPU occupancy, "the last symbol occupied by the PDCCH containing the DCI indicating the non-periodic CSI report #X" can be replaced with "the first symbol of the first transmitted CSI-RS / CSI-IM / SSB resource corresponding to the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CSI-IM / SSB opportunities for CSI report #X". In order to avoid confusing the subject of the description, detailed examples of all methods will be omitted.

[0371] Fig.15 Another example of CPU occupancy calculation according to some embodiments of the present disclosure is shown.

[0372] refer to Fig.15 , the CPU occupancy time of a periodic or semi-persistent CSI report in which the number of reports included in the CSI report is not set to "none" can be determined. When the base station sends a periodic or semi-persistent CSI report #X 15-00 in an uplink time slot n' using DCI format 0_1 ​​scrambled by SP-CSI-RNTI through higher layer signaling or DCI indication, one of the following various CPU occupancy time calculation methods can be applied according to the following situations: whether the uplink / downlink related to the PUSCH or CSI-RS / CSI-IM CSI report #X is a licensed band or an unlicensed band, or whether channel occupancy is always possible or conditional channel occupancy is possible (i.e., when a certain frequency / time resource can be a channel occupied duration and a channel non-occupied duration).

[0373] Method 4) When channel occupancy for uplink / downlink in the licensed band is always possible, the CPU occupancy time 15-30 of the CSI report #X sent in the uplink time slot n' can be defined as "from the first symbol of the first transmitted CSI-RS / CSI-IM / SSB resource 15-10 corresponding to the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CS-IM / SSB opportunities of the CSI report #X sent in the uplink time slot n' to the last symbol occupied by the PUCCH or PUSCH 15-00 including the CSI report #X sent in the uplink time slot n'".

[0374] In the following description of the present disclosure, for the convenience of description, "the first transmitted CSI-RS / CSI-IM / SSB resource corresponding to the last CSI-RS / CSI-IM / SSB opportunity among the CSI-RS / CSI-IM / SSB opportunities for CSI report #X" will be described as "the most recent CSI-RS / CSI-IM / SSB resource for CSI report #X". Exceptionally, when the base station indicates a semi-persistent CSI report through DCI so that the terminal performs the first CSI report of the semi-persistent CSI report #X, the CPU occupancy time for the first CSI report can be defined as "from the next symbol of the last symbol occupied by the PDCCH including the DCI indicating the semi-persistent CSI report #X to the last symbol occupied by the PUSCH including the first CSI report". In this way, the causality of the time domain operation of the terminal can be guaranteed based on the time point when the CSI report starts and the time point when the CPU occupancy time starts.

[0375] Method 5) Method 5 is a method of calculating the CPU occupancy time in the following case: some of the CSI-RS / CSI-IM resources of the periodic or semi-persistent CSI report where reportQuantity is not set to "none" overlap with the channel non-occupancy duration. When some or all of the "most recent CSI-RS / CSI-IM / SSB resources 15-10 for CSI report #X" overlap with the channel non-occupancy duration 15-20 due to the channel access procedure, the CPU occupancy time #2 15-40 for CSI report #X can be defined as "from the first symbol of the "most recent CSI-RS / CSI-IM / SSB resource 15-20 before the channel non-occupancy duration for CSI report #X" to the last symbol occupied by the PUCCH or PUSCH 15-00 including the CSI report #X transmitted in the uplink time slot n'". This is intended to ensure space occupied by the CPU of the terminal, considering that when RS transmission / reception of CSI reporting is not performed due to channel non-occupancy, it is necessary to refer to the RS transmitted before the RS to perform CSI reporting. In another example, when all or part of the "nearest CSI-RS / CSI-IM / SSB resources 15-10 for CSI report #X" overlap with the channel non-occupancy duration 15-20 due to the channel access procedure, the CPU occupancy time #3 15-50 of CSI report #X can be defined as canceling the entire existing CPU occupancy 15-30. In this way, considering that when RS transmission / reception of CSI reporting is not performed due to channel non-occupancy, it is necessary to perform CSI reporting with reference to the RS transmitted before the RS, it can be considered that CSI generation based on the previously transmitted RS has been completed.

[0376] When performing CSI reporting, that is, when multiple NZP CSI-RS resources or CSI-IM resources are configured in one resource setting, one NZP CSI-RS resource can be used for CSI calculation by pairing with one CSI-IM resource. That is, when a total of N CSI-RS resources are configured in a certain resource setting and a total of N CSI-IM resources are configured in another resource setting so that CRI can indicate one of 0 to (N-1), CRI=0 may refer to using the first CSI-IM resource among the CSI-RS and CSI-IM resources configured in the resource setting for corresponding CSI calculation and channel measurement and interference measurement from the first CSI-RS resource, and CRI=N-1 may refer to using the (N-1)th CSI-IM resource among the CSI-RS and CSI-IM resources configured in the resource setting for corresponding CSI calculation and channel measurement and interference measurement from the (N-1)th CSI-RS resource. When one CSI-RS resource or CSI-IM resource in the nth {CSI-RS resource, CSI-IM resource} pair overlaps with the channel non-occupied duration, the terminal may assume that other resources that do not overlap with the channel non-occupied duration overlap with the channel non-occupied duration. This may mean that when at least one of the CSI-RS resources or CSI-IM resources indicated by a certain CRI value overlaps with the channel non-occupied duration, the terminal does not report the CRI value to the base station.

[0377] At the same time, the time in which the overlap of the channel non-occupancy duration and the PUSCH resource is fixed can be the first symbol after the minimum processing time required for the terminal to obtain the channel occupation time information, and the practice is to process the DCI immediately after the last symbol occupied by the PDCCH including at least the DCI including the channel occupation duration information from the base station. In the description of the present disclosure, when "guaranteeing condition A for the terminal", it can be understood as various meanings, such as "not expecting that condition A will not be met", "not performing operations related to condition A when condition A is not met", "ignoring the indication of the base station related to condition A when condition A is not met", etc. In addition, in order not to confuse the subject of the description, the aforementioned description will not be repeated.

[0378] [Third Embodiment: Method for Determining CSI-RS Active Duration Time According to Channel Occupancy or Channel Non-Occupancy]

[0379] A third embodiment of the present disclosure may provide a method for determining a CSI-RS active duration according to channel occupancy or channel non-occupancy.

[0380] The following active duration can be defined for NZP CSI-RS resources (or CSI-IM resources or SSBs). It can be guaranteed that the terminal does not measure a number of active CSI-RS ports or active CSI-RS resources greater than the value reported by the terminal (UE) capability signaling in a certain time slot. When a CSI-RS resource is referenced by N CSI report settings (that is, a CSI-RS resource involves the generation of N CSIs), the CSI-RS resource can be counted as N active CSI-RS resources. The active duration of a CSI-RS resource or port can be defined differently according to the time domain behavior of the CSI-RS. For non-periodic CSI-RS, the active duration can be defined as the time from "the symbol that triggers the end of the PDCCH to the end of the PUSCH transmission including the relevant CSI report". For semi-persistent (Sp)CSI-RS, the active duration may be defined as "from the time when the activation command for SpCSI-RS is applied (for MAC CE-based activation, the time 3ms after the start of the HARQ-ACK time reported for MACCE, and for DCI-based activation, the time including the end of the last symbol of PDCCH of DCI) to the time when the deactivation command for Sp CSI-RS is applied (same as above)". For periodic (P)CSI-RS, the active duration may be defined as "from the time when PCSI-RS is configured by a higher layer to the time when the higher layer configuration of PCSI-RS is released". The active duration of SSB may refer to the definition of the active duration of PC CSI-RS.

[0381] Meanwhile, based on the transmission or non-transmission of the RS due to the channel occupation duration or the channel non-occupancy duration, the active duration for the CSI-RS (or CSI-IM or SSB) resource and port may be modified by referring to one of the following methods:

[0382] Method 1) According to the first method, when certain Sp or PCS resources overlap with the channel non-occupancy duration, the Sp or PCS resources may not be considered as active CSI-RS ports or resources from the time when the channel non-occupancy duration starts (or ends) to the earliest transmission time among the Sp or PCS resources transmitted after the channel non-occupancy duration. It can be understood that when a certain Sp or PCS resource fails to be transmitted due to channel non-occupancy, the active duration of the CSI-RS resource or port transmitted in the resource is canceled until the next transmission. In this case, advantageously, in the case where the channel non-occupancy duration occurs at the Sp or PCS transmission time, additional Ap CSI-RS transmission can be performed without waiting for the next transmission time of Sp or PCS. When the additional Ap CSI-RS transmission occurs before the next transmission time of Sp or PCS, the time when the cancellation of the activation duration of Sp or PCS can be extended to the PUSCH transmission end time of the CSI report based on the additional Ap CSI-RS transmission. That is, "the time when the activation duration of Sp or PCSI-RS is canceled" can be the later time between "the next transmission time of Sp or PCSI-RS" and "the PUSCH transmission end time of CSI report based on additional Ap CSI-RS transmission". In this way, the terminal and the base station do not violate the terminal capability report value of the maximum CSI-RS port or active CSI-RS resource due to the additional Ap CSI-RS transmission.

[0383] Method 2) The second method is that when some AP CSI-RS overlaps with the channel non-occupied duration, the Ap CSI-RS port or resource within the overlapping duration is not considered as an active CSI-RS port or resource. In this case, the "time when the Ap CSI-RS port or resource overlapping with the channel non-occupied duration is not considered as an active CSI-RS port or resource" can be agreed upon as the starting symbol of the channel non-occupied duration, or in another example, agreed upon as the later time between the time when the starting point of the channel non-occupied duration is known and the last symbol of the PDCCH including the DCI that triggers the Ap CSI-RS. By using the second method, the base station and the terminal can ensure space for performing another CSI report by avoiding maintaining the Ap CSI-RS active duration for an invalid CSI report.

[0384] According to method 1 and method 2, the terminal may ignore, skip or not update the CSI report that references the CSI-RS that does not belong to the active CSI-RS. In this way, the flexibility of CSI report setting or triggering may be improved, and the efficiency of data transmission may be enhanced.

[0385] Fig.16 A flowchart illustrating the operation sequence of a base station and a terminal according to some embodiments of the present disclosure.

[0386] refer to Fig.16 , in operation 16-00, the base station may notify the terminal of the CSI report-related configuration, or indicate or trigger a non-periodic / semi-persistent CSI report based on the configuration. Thereafter, in operation 16-05, the base station and the terminal may determine whether the downlink channel for receiving the RS signal is occupied by using at least one of the methods according to the first to third embodiments of the present disclosure. Then, in operation 16-15, the base station and the terminal may determine whether the uplink channel for CSI reporting is occupied by using at least one of the methods according to the first to third embodiments of the present disclosure. In operation 16-20, the base station and the terminal may determine the validity of the CSI report by using at least one of the methods according to the first to third embodiments of the present disclosure, and perform CSI reporting accordingly.

[0387] Fig.17 A block diagram showing a configuration of a terminal according to some embodiments of the present disclosure.

[0388] refer to Fig.17 , the terminal may include a terminal receiver 17-00, a terminal transmitter 17-10, and a terminal processor 17-05. The terminal receiver 17-00 and the terminal transmitter 17-10 may be collectively referred to as a transceiver. According to the above communication method of the terminal, the terminal receiver 17-00, the terminal transmitter 17-10, and the terminal processor 17-05 of the terminal may operate. However, the components of the terminal are not limited to the above examples. For example, the terminal may include more components (e.g., memory, etc.) or fewer components than the above components. In addition, the terminal receiver 17-00, the terminal transmitter 17-10, and the terminal processor 17-05 may be implemented in a single chip form.

[0389] The terminal receiver 17-00 and the terminal transmitter 17-10 (or transceiver) can send signals to and receive signals from the base station. The signal may include control information and data. For this purpose, the transceiver may include: an RF transmitter that up-converts and amplifies the frequency of the transmitted signal; and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is only an example of a transceiver, and its components are not limited to RF transmitters and RF receivers.

[0390] The transceiver may receive a signal through a radio channel and output the received signal to the terminal processor 17 - 05 , and transmit a signal output from the terminal processor 17 - 05 through the radio channel.

[0391] The memory (not shown) can store programs and data required for the operation of the terminal. The memory can also store control information or data included in the signal obtained by the terminal. The memory can include a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media.

[0392] The terminal processor may control a series of processes so that the terminal operates according to the above-described embodiments of the present disclosure.The terminal processor 17-05 may be implemented as a controller or one or more processors.

[0393] Fig.18 A block diagram showing the configuration of a base station according to some embodiments of the present disclosure is shown.

[0394] refer to Fig.18 , the base station may include a base station receiver 18-00, a base station transmitter 18-10, and a base station processor 18-05. The base station receiver 18-00 and the base station transmitter 18-10 will be collectively referred to as a transceiver. According to the above-mentioned communication method of the base station, the base station receiver 18-00, the base station transmitter 18-10, and the base station processor 18-05 of the base station can operate. However, the components of the base station are not limited to the above examples. For example, the base station may include more components (e.g., memory, etc.) or fewer components than the above components. In addition, the base station receiver 18-00, the base station transmitter 18-10, and the base station processor 18-05 can be implemented in the form of a single chip.

[0395] The base station receiver 18-00 and the base station transmitter 18-10 (or transceiver) can send signals to and receive signals from the terminal. In this article, the signal may include control information and data. For this purpose, the transceiver 1410 may include: an RF transmitter that up-converts and amplifies the frequency of the transmitted signal; and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is only an example of a transceiver, and its components are not limited to RF transmitters and RF receivers.

[0396] The transceiver may receive a signal through a radio channel and output the received signal to the base station processor 18-05, and transmit a signal output from the base station processor 18-05 through the radio channel.

[0397] The memory (not shown) may store programs and data required for the operation of the base station. The memory may also store control information or data included in the signal obtained by the base station. The memory may include a storage medium such as ROM, RAM, hard disk, CD-ROM, DVD, etc., or a combination of storage media.

[0398] The base station processor 18-05 may control a series of processes so that the base station operates according to the above-described embodiments of the present disclosure. The base station processor 18-05 may be implemented as a controller or one or more processors.

[0399] The embodiments disclosed in the present disclosure may provide an apparatus and method for effectively saving terminal power in a wireless communication system.

[0400] Although the present disclosure has been described with various embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

Claims

1. A method performed by a terminal in a wireless communication system, the method comprising: Receiving channel state information CSI resource configuration information and CSI report configuration information from a base station; receiving, from the base station, information associated with a channel occupancy duration configured in symbols; Based on the CSI resource configuration information and the information associated with the channel occupancy duration, identifying whether a group of symbols configured for receiving a channel state information reference signal CSI-RS is not within the channel occupancy duration; When a group of symbols configured for receiving the CSI-RS is not within the channel occupancy duration, cancel receiving the CSI-RS on the symbols; as well as In a case where a group of symbols configured for receiving the CSI-RS is within the channel occupancy duration, the CSI-RS is received on the group of symbols, and based on the CSI report configuration information, a CSI report for the received CSI-RS is sent to the base station.

2. The method according to claim 1, further comprising: Determining, based on the CSI report configuration information and information associated with a channel occupancy duration, whether an uplink channel used to send the CSI report is within the channel occupancy duration; as well as In a case where the uplink channel used for sending the CSI report is within the channel occupancy duration, determining the CSI report to be sent.

3. The method of claim 1 , wherein receiving the CSI-RS on the set of symbols comprises: The CSI-RS is received on at least one symbol in a group of symbols configured for receiving the CSI-RS within the channel occupancy duration.

4. The method according to claim 1, further comprising: determining the CSI processing unit CPU occupancy time without considering the channel occupancy duration, The sending of the CSI report includes: sending the CSI report for the received CSI-RS based on the CSI report configuration information and the determined CPU occupancy time.

5. The method according to claim 1, further comprising: identifying a channel non-occupancy duration for the CSI report based on the information associated with the channel occupation duration; determining, for the CSI report, a nearest CSI-RS resource before the channel non-occupancy duration; and Determine a CSI processing unit CPU occupancy time based on the most recent CSI-RS resource before the channel non-occupancy duration of the CSI report, The sending of the CSI report includes: sending the CSI report for the received CSI-RS based on the CSI report configuration information and the determined CPU occupancy time.

6. The method according to claim 1, in, The channel occupancy duration includes all downlink symbols in the CSI reference resource, and The CSI-RS is received before the CSI reference resource.

7. A terminal in a wireless communication system, the terminal comprising: Transceiver; as well as at least one processor coupled to the transceiver and configured to: Receive channel state information CSI resource configuration information and CSI report configuration information from the base station, receiving information associated with a channel occupancy duration configured in symbols from the base station, Based on the CSI resource configuration information and the information associated with the channel occupancy duration, identifying whether a group of symbols configured for receiving a channel state information reference signal CSI-RS is not within the channel occupancy duration, In a case where a group of symbols configured for receiving the CSI-RS is not within the channel occupancy duration, canceling receiving the CSI-RS on the symbols, and In a case where a group of symbols configured for receiving the CSI-RS is within the channel occupancy duration, the CSI-RS is received on the group of symbols, and based on the CSI report configuration information, a CSI report for the received CSI-RS is sent to the base station.

8. The terminal according to claim 7, wherein the at least one processor is further configured to: Determining, based on the CSI report configuration information and information associated with a channel occupancy duration, whether an uplink channel used to send the CSI report is within the channel occupancy duration; and In a case where the uplink channel used for sending the CSI report is within the channel occupancy duration, determining the CSI report to be sent.

9. The terminal according to claim 7, wherein the at least one processor is further configured to: The CSI-RS is received on at least one symbol in a group of symbols configured for receiving the CSI-RS within the channel occupancy duration.

10. The terminal according to claim 7, wherein the at least one processor is further configured to: determining the CSI processing unit CPU occupancy time without considering the channel occupancy duration, The CSI report for the received CSI-RS is sent based on the CSI report configuration information and the determined CPU occupancy time.

11. The terminal according to claim 7, wherein the at least one processor is further configured to: identifying a channel non-occupancy duration for the CSI report based on the information associated with the channel occupancy duration, determining, for the CSI report, a nearest CSI-RS resource prior to the channel non-occupancy duration, and Determining a CSI processing unit CPU occupancy time based on the most recent CSI-RS resource before the channel non-occupancy duration reported by the CSI, and The CSI report for the received CSI-RS is sent based on the CSI report configuration information and the determined CPU occupancy time.

12. The terminal according to claim 7, in, The channel occupancy duration includes all downlink symbols in the CSI reference resource, and The CSI-RS is received before the CSI reference resource.

Images