Method and apparatus for reducing power consumption of base station in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. According to the present disclosure, a method performed by a terminal in a wireless communication system comprises the steps of: receiving a first signal including cell discontinuous reception (DRX) related information on a first cell from a base station; and identifying a cell DRX inactive period based on the cell DRX related information, wherein the second signal may not be transmitted to the base station in a slot corresponding to the cell DRX inactive period.

Description

Technical Field

[0001] The present disclosure relates to operations of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method and apparatus for reducing power consumption of a base station in a multi-cell environment in a wireless communication system. Background Art

[0002] 5G mobile communications technology defines a wide frequency band to enable high transmission rates and new services, and can be implemented not only in "sub-6 GHz" frequency bands such as 3.5 GHz, but also in ultra-high frequency ("above 6 GHz") frequency bands known as millimeter waves (such as 28 GHz and 39 GHz). Furthermore, consideration is being given to implementing 6G mobile communications technology in the terahertz frequency band (e.g., the 95 GHz to 3 THz band) (referred to as a "super 5G system") to achieve transmission rates fifty times faster than 5G mobile communications technology and ultra-low latency one-tenth that of 5G mobile communications technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet the performance requirements of enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC), standardization has been carried out on the following technologies: beamforming and massive MIMO for reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves; supporting parameters for dynamic operation of efficient utilization of millimeter wave resources and time slot formats (for example, operation of multiple subcarrier spacings); initial access technology for supporting multi-beam transmission and wide frequency bands; definition and operation of BWP (bandwidth part); new channel coding methods such as LDPC (low-density parity-check) codes for large-scale data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks dedicated to specific services.

[0004] Currently, with respect to services supported by 5G mobile communication technology, the industry is continuously discussing improvements and performance enhancements to initial 5G mobile communication technology, and has completed physical layer standardization for technologies such as: Vehicle-to-Everything (V2X) for assisting driving decisions based on information transmitted by vehicles regarding their location and status and for improving user convenience; New Radio Unlicensed (NR-U) for system operation in compliance with various regulatory requirements in unlicensed frequency bands; NR UE energy saving; Non-Terrestrial Network (NTN) for direct UE satellite communication to ensure coverage in areas where communication with terrestrial networks is not possible; and positioning.

[0005] In addition, standardization of air interface architecture / protocols for technologies such as the Industrial Internet of Things (IIoT) supports new services through interoperability and integration with other industries; IAB (Integrated Access and Backhaul) provides nodes for network service area expansion by integrating wireless backhaul and access links; mobility enhancements including conditional handover and DAPS (Dual Active Protocol Stack) handover; and two-step random access (2-step RAC for NR) to simplify the random access procedure. Standardization of system architecture / services for technologies such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software-defined networking (SDN) technologies; and mobile edge computing (MEC) for receiving services based on UE location are also progressing.

[0006] If such 5G mobile communication systems are commercialized, the already exponentially growing number of connected devices will be connected to the communication network, and it is expected that the functionality and performance of the 5G mobile communication systems and the integrated operation of the connected devices will need to be enhanced. To this end, new research is being put on the following technologies: extended reality (XR) for efficiently supporting augmented reality (AR), virtual reality (VR), mixed reality (MR), etc.; 5G performance improvements and complexity reduction through the use of artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communications.

[0007] Furthermore, this evolution of 5G mobile communication systems will not only lay the foundation for the development of new waveforms for providing coverage in the terahertz band of 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas; metamaterial-based lenses and antennas for improving coverage of terahertz band signals; high-dimensional spatial multiplexing technology using orbital angular momentum (OAM); and reconfigurable smart surfaces (RIS), but will also lay the foundation for the development of full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technology for achieving system optimization from the design stage by leveraging satellites and AI (artificial intelligence) and internalizing end-to-end AI support functions; and next-generation distributed computing technology for implementing services at a complexity level that exceeds the operational capabilities of UEs by utilizing ultra-high-performance communication and computing resources. Summary of the Invention

[0008] Technical issues

[0009] The present disclosure will provide an apparatus and method capable of efficiently providing services in a wireless communication system.

[0010] Problem Solution

[0011] According to an embodiment of the present disclosure, a method of the present disclosure performed by a terminal in a wireless communication system may include: receiving configuration information of a cell DRX by indicating a second signal of a second time period; determining whether at least one symbol of a time resource of a first signal scheduled to a first cell is included in the first time period; determining whether transmission can be performed in a cell other than the first cell when at least one symbol in the time resource of the first signal overlaps with the second time period; and in a case where another cell is determined in which transmission can be performed, transmitting the first signal through the determined other cell.

[0012] Advantageous Effects of the Invention

[0013] The embodiments proposed in the present disclosure may provide an apparatus and method capable of effectively providing services in a wireless communication system.

[0014] Advantageous effects obtainable from the present disclosure may not be limited to the above-mentioned effects, and other effects not mentioned herein may be clearly understood by those skilled in the art to which the present disclosure pertains through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure is shown.

[0016] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to an embodiment of the present disclosure is shown.

[0017] Figure 3 An example of bandwidth portion configuration in a wireless communication system according to an embodiment of the present disclosure is shown.

[0018] Figure 4 An example of a control resource set configuration of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0019] Figure 5 The structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown.

[0020] Figure 6 From the perspective of span, it is shown that in a wireless communication system according to an embodiment of the present disclosure, a UE may have multiple PDCCH monitoring opportunities within a time slot.

[0021] Figure 7 An example of base station beam allocation configured according to TCI status in a wireless communication system according to an embodiment of the present disclosure is shown.

[0022] Figure 8An example of a method for performing TCI state allocation on a PDCCH in a wireless communication system according to an embodiment of the present disclosure is shown.

[0023] Figure 9 The TCI indication MACCE signaling structure of the PDCCH DMRS in a wireless communication system according to an embodiment of the present disclosure is shown.

[0024] Figure 10 An example of beam configuration and search space regarding a control resource set in a wireless communication system according to an embodiment of the present disclosure is shown.

[0025] Figure 11 An example of a method in which a base station and a UE transmit / receive data in consideration of a downlink data channel and rate matching resources in a wireless communication system according to an embodiment of the present disclosure is shown.

[0026] Figure 12 An example of a method in which, after receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure, a UE selects a receivable control resource set in consideration of a priority level is shown.

[0027] Figure 13 An example of an aperiodic CSI reporting method according to an embodiment of the present disclosure is shown.

[0028] Figure 14 An example of PUSCH repetition type B transmission in a wireless communication system according to an embodiment of the present disclosure is shown.

[0029] Figure 15 The radio protocol structures of a base station and a UE in single cell, carrier aggregation, and dual connectivity scenarios according to an embodiment of the present disclosure are shown.

[0030] Figure 16 An example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown.

[0031] Figure 17 An example of downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown.

[0032] Figure 18 The process of controlling the transmission power of UE by a base station in a cellular system is shown.

[0033] Figure 19 A signal transmission / reception period of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0034] Figure 20Operations of a terminal when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure are illustrated.

[0035] Figure 21 Operations of a terminal when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure are illustrated.

[0036] Figure 22 Operations of a terminal when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure are illustrated.

[0037] Figure 23 Operations of a terminal when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure are illustrated.

[0038] Figure 24 Operations of a terminal when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure are illustrated.

[0039] Figure 25 The operation of a terminal in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0040] Figure 26 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0041] Figure 27 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0042] To meet the increased demand for wireless data services since the deployment of 4G communication systems, efforts have been underway to develop improved 5G or pre-5G communication systems. Consequently, 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-LTE" systems. 5G communication systems are expected to be implemented in ultra-high frequency (millimeter wave) frequency bands (e.g., the 60 GHz band) to achieve higher data rates. To reduce radio wave propagation losses and increase the transmission range of radio waves in these ultra-high frequency bands, beamforming, massive multiple-input multiple-output (Massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technologies are being discussed in 5G communication systems. Furthermore, within 5G communication systems, technological development is underway to improve system networks based on evolved small cells, advanced small cells, cloud radio access networks (Cloud RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), and receiver-side interference cancellation. In 5G systems, hybrid FSK with QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed 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 technologies.

[0043] The Internet, a human-centric connectivity network in which humans generate and consume information, has evolved into the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, combining IoT technology with big data processing technologies through connections to cloud servers and other platforms. Because IoT implementation requires technical elements such as sensing technology, wired / wireless communications and network infrastructure, service interface technology, and security technology, research has recently focused on sensor networks, machine-to-machine (M2M) communication, and machine-type communication (MTC). 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 things. The IoT can be applied to a wide range of fields, including smart homes, smart buildings, smart cities, smart cars (connected vehicles), smart grids, healthcare, smart appliances, and advanced medical services, through the integration and combination of existing information technology (IT) with various industrial applications.

[0044] Therefore, various attempts have been made to apply 5G communication systems (fifth-generation communication systems, or New Radio (NR)) to IoT networks. For example, technologies such as sensor networks, machine-type communication (MTC), and machine-to-machine (M2M) communication are implemented using beamforming, MIMO, and array antennas, which are 5G communication technologies. Cloud Radio Access Networks (Cloud RAN), as an application of the aforementioned big data processing technology, can also be considered an example of the convergence of 5G and IoT technologies.

[0045] With the development of wireless communication systems as described above, various services can be provided, and thus a way of smoothly providing these services is required.

[0046] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0047] In the process of describing the embodiments, descriptions related to technical contents well-known in the relevant field and not directly related to the present disclosure will be omitted. Such unnecessary omissions are to prevent the main idea of ​​the present disclosure from being obscured and to convey the main idea more clearly.

[0048] For the same reason, in the accompanying drawings, some elements may be exaggerated, omitted or schematically shown. In addition, the size of each element does not fully reflect the actual size. In the corresponding drawings, the same or corresponding elements are assigned the same reference numerals.

[0049] The advantages and features of the present disclosure and the methods for achieving them will become apparent by reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments set forth below, but may be implemented in various different forms. The following embodiments are provided solely to fully disclose the present disclosure and to inform those skilled in the art of the scope of the present disclosure, and the present disclosure is limited only by the scope of the appended claims. Throughout the specification, identical or similar reference numerals indicate identical or similar elements. In addition, when describing the present disclosure, detailed descriptions of known functions or configurations incorporated herein will be omitted when it is determined that the description may make the subject matter of the present disclosure unnecessarily unclear. The terms to be described below are terms defined in view of the functions in the present disclosure and may differ according to the user, the user's intention or custom. Therefore, the definition of the terms should be determined based on the content throughout the specification.

[0050] In the following description, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, an eNode B, a Node B, a base station (BS), a wireless access unit, a base station controller, and a node on a network. A terminal can include a user equipment (UE), a mobile station (MS), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing communication functions. In this disclosure, "downlink (DL)" refers to the radio link via which a base station transmits signals to a terminal, and "uplink (UL)" refers to the radio link via which a terminal transmits signals to a base station. Furthermore, in the following description, LTE or LTE-A systems may be described by way of example, but embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types. Examples of these communication systems may include 5th generation mobile communication technologies (5G, New Radio, and NR), which have evolved beyond LTE-A. In the following description, "5G" may be a concept that encompasses existing LTE, LTE-A, and other similar services. Furthermore, based on the judgment of those skilled in the art, the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of this disclosure.

[0051] In this document, it should be understood that each block of the flowchart diagram and the combination of blocks in the flowchart diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction device, which implements the functions specified in the one or more flowchart blocks. 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 provide steps for implementing the functions specified in one or more flowchart blocks.

[0052] In addition, each block in the flowchart illustration may represent a module, code segment, or code portion that includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, depending on the functionality involved, two blocks shown in succession may actually be executed approximately simultaneously, or the blocks may sometimes be executed in reverse order.

[0053] As used in the embodiments of the present disclosure, the term "unit" refers to a software element or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), and a "unit" can perform certain functions. However, the term "unit" is not always limited to software or hardware. A "unit" can be configured to be stored in an addressable storage medium or to execute one or more processors. Thus, a unit includes, for example, a software element, an object-oriented software element, a class element, or a task element, a process, a function, an attribute, a procedure, a subroutine, a program code segment, a driver, firmware, microcode, circuits, data, a database, a data structure, a table, an array, and parameters. The elements and functions provided by a "unit" can be combined into a smaller number of elements or "units" or divided into a larger number of elements or "units." Furthermore, elements and "units" can be implemented as one or more CPUs within a playback device or a secure multimedia card. Furthermore, a "unit" in the embodiments may include one or more processors.

[0054] Wireless communication systems have evolved into broadband wireless communication systems for providing high-speed and high-quality packet data services using communication standards such as 3GPP's High Speed ​​Packet Access (HSPA), LTE {Long Term Evolution or Evolved Universal Terrestrial Radio Access (E-UTRA)}, LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's High Speed ​​Packet Data (HRPD), Ultra Mobile Broadband (UMB), IEEE 802.16e, as well as typical voice-based services.

[0055] As a typical example of a broadband wireless communication system, the LTE system adopts an orthogonal frequency division multiplexing (OFDM) scheme in the downlink (DL) and a single-carrier frequency division multiple access (SC-FDMA) scheme in the uplink (UL). The uplink refers to the radio link via which a user equipment (UE) (or mobile station (MS)) transmits data or control signals to a base station (BS, eNode B, or gNode B), and the downlink refers to the radio link via which a base station transmits data or control signals to a UE. This multiple access scheme can separate the data or control information of each user by allocating and manipulating the time-frequency resources used to transmit data or control information to each user, thereby avoiding overlap, that is, establishing orthogonality.

[0056] As a post-LTE communication system, 5G communication systems must freely reflect the diverse requirements of users, service providers, and others, and therefore must support services that meet these diverse requirements. Services considered in 5G communication systems include enhanced mobile broadband (eMBB) communications, massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0057] eMBB aims to provide higher data rates than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink for a single base station. Furthermore, 5G communication systems must provide increased user-perceived data rates and maximum data rates for UEs. Meeting these requirements requires improved transmit / receive technologies, including further enhanced multiple-input, multiple-output (MIMO) transmission technology. Furthermore, the data rates required by 5G communication systems can be achieved using frequency bandwidths exceeding 20 MHz in frequency bands between 3 and 6 GHz, or 6 GHz or higher, rather than the 20 MHz transmission bandwidths used in LTE, which require signal transmission in the 2 GHz band.

[0058] In addition, in the 5G communication system, mMTC is considered to support application services such as the Internet of Things (IoT). mMTC has requirements such as supporting the connection of a large number of UEs within a cell, enhancing UE coverage, improving battery life, and reducing UE costs in order to effectively provide the Internet of Things. Since the Internet of Things provides communication functions while being provided to various sensors and various devices, it must support a large number of UEs (e.g., 1,000,000 UEs / km) in a cell. 2 ). In addition, mMTC-enabled UEs may require wider coverage than other services provided by 5G communication systems because UEs are likely to be located in shadowed areas, such as basements of buildings, which are not covered by cells due to the nature of the service. mMTC-enabled UEs must be configured inexpensively and may require very long battery life, such as 10 to 15 years, because it is difficult to frequently replace the UE's battery.

[0059] Finally, URLLC is a cellular-based mission-critical wireless communication service. For example, URLLC can be used for services such as remote control of robots or machines, industrial automation, unmanned aerial vehicles, remote healthcare, and emergency alerts. Therefore, URLLC must provide communications with ultra-low latency and ultra-high reliability. For example, services supporting URLLC should meet an air interface latency of less than 0.5 ms and also require 10 -5 Therefore, for services supporting URLLC, the 5G system must provide a shorter Transmission Time Interval (TTI) than other services, and may require a design for allocating a large amount of resources within the frequency band to ensure the reliability of the communication link.

[0060] The three 5G services (eMBB, URLLC, and mMTC) can be multiplexed and transmitted within a single system. In this scenario, different transmit / receive technologies and parameters can be used across the various services to meet their varying requirements. 5G is not limited to the three services described above.

[0061] [NR time-frequency resources]

[0062] Hereinafter, the framework structure of the 5G system will be described in more detail with reference to the accompanying drawings.

[0063] Figure 1 The basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure is shown.

[0064] exist Figure 1 In the time-frequency domain, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time-frequency domain is a resource element (RE) 101, which can be defined as one orthogonal frequency division multiplexing (OFDM) symbol 102 on the time axis and one subcarrier 103 on the frequency axis. In the frequency domain, (eg, 12) consecutive REs may constitute one resource block (RB) 104 .

[0065] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to an embodiment of the present disclosure is shown.

[0066] refer to Figure 2 ,exist Figure 2 An example of the structure of a frame 200, a subframe 201, and a time slot 202 is shown in FIG. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus one frame 200 may include a total of 10 subframes 201. One time slot 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot). =14). One subframe 201 may include one or more time slots 202 and 203, and the number of time slots 202 and 203 of each subframe 201 may be different according to the configured value μ for the subcarrier spacing 204 or 205. Figure 2 The figure shows the case where the subcarrier spacing configuration value is μ = 0 (204), and the case where μ = 1 (205). In the case where μ = 0 (204), one subframe 201 may include one time slot 202, and in the case where μ = 1 (205), one subframe 201 may include two time slots 203. That is, the number of time slots in each subframe is The number of slots per frame may vary depending on the subcarrier spacing configuration value μ and therefore It can be different. and It can be defined according to each subcarrier spacing configuration μ, as shown in Table 1 below.

[0067] [Table 1]

[0068] [Bandwidth Part (BWP)] Next, a bandwidth part (BWP) configuration in the 5G communication system will be described in detail with reference to the accompanying drawings.

[0069] Figure 3 An example of bandwidth portion configuration in a wireless communication system according to an embodiment of the present disclosure is shown.

[0070] Figure 3 An example is shown in which a UE bandwidth 300 is configured to include two bandwidth parts, namely, bandwidth part #1 (BWP#1) 301 and bandwidth part #2 (BWP#2) 302. The base station can configure one or more bandwidth parts for the UE and can configure the following multiple pieces of information given below for each bandwidth part.

[0071] [Table 2]

[0072] Obviously, the above examples are not limiting, and in addition to the above configuration information, various parameters related to bandwidth parts may also be configured for the UE. The base station may transmit the configuration information to the UE via higher-layer signaling (e.g., radio resource control (RRC) signaling). One configured bandwidth part, or at least one of multiple configured bandwidth parts, may be activated. Whether a configured bandwidth part is activated may be semi-statically transmitted to the UE via RRC signaling or dynamically transmitted via downlink control information (DCI). According to some embodiments, before establishing a radio resource control (RRC) connection, the base station may configure an initial bandwidth part (BWP) for the UE for initial access via a master information block (MIB). More specifically, during the initial access procedure, the UE may receive configuration information regarding a control resource set (CORESET) and a search space for a PDCCH that may be used to transmit system information required for initial access (which may correspond to residual system information (RMSI) or system information block 1 (SIB1)). Each of the CORESET and search space configured via the MIB may be considered as identity (ID) 0. The base station can notify the UE of configuration information about control region #0, such as frequency allocation information, time allocation information, and parameter sets, through the MIB. Furthermore, the base station can notify the UE of configuration information about the monitoring period and timing for control resource set #0, i.e., configuration information about search space #0, through the MIB. The UE can regard the frequency domain configured by control resource set #0, obtained from the MIB, as the initial bandwidth portion for initial access. The ID of the initial bandwidth portion can be regarded as 0.

[0073] The bandwidth-dependent configurations supported by 5G can be used for various purposes.

[0074] According to an embodiment, when the bandwidth supported by the UE is smaller than the system bandwidth, this can be supported through bandwidth fraction configuration. For example, the base station can configure the frequency location of the bandwidth fraction for the UE (configuration information 2), so that the UE can transmit / receive data at a specific frequency location within the system bandwidth.

[0075] In addition, according to an embodiment, the base station can configure multiple bandwidth parts for the UE to support different parameter sets. For example, to support the UE to use a subcarrier spacing of 15 kHz and a subcarrier spacing of 30 kHz for data transmission / reception, two bandwidth parts can be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth parts can be frequency division multiplexed (FDM), and if data is transmitted / received with a specific subcarrier spacing, the bandwidth part configured with the corresponding subcarrier spacing can be activated.

[0076] In addition, according to an embodiment, the base station can configure bandwidth portions of different sizes for the terminal to reduce the power consumed by the UE. For example, if the UE supports a relatively large bandwidth (e.g., 100 MHz) and always transmits / receives data using the corresponding bandwidth, considerable power consumption may occur. In particular, from a power consumption perspective, unnecessarily monitoring the downlink control channel using a large 100 MHz bandwidth when there is no traffic may be quite inefficient. To reduce the UE's power consumption, the base station can configure the UE with a relatively smaller bandwidth portion (e.g., a 20 MHz bandwidth portion). The UE can perform monitoring operations in the 20 MHz bandwidth portion when there is no traffic, and if data is available, it can transmit / receive data using the 100 MHz bandwidth portion as instructed by the base station.

[0077] Regarding the bandwidth part configuration method, the UE can receive configuration information regarding the initial bandwidth part via the MIB during the initial access step before establishing an RRC connection. More specifically, the UE may have a control resource set (CORESET) configured for the downlink control channel. This CORESET can be used to transmit downlink control information (DCI) for scheduling system information blocks (SIBs) from the MIB of the physical broadcast channel (PBCH). The bandwidth of the CORESET configured via the MIB can be considered the initial bandwidth part, and the UE can receive the physical downlink shared channel (PDSCH) through which the SIBs are transmitted via the configured initial bandwidth part. The initial bandwidth part can be used not only for receiving SIBs, but also for other system information (OSI), paging, random access, and so on.

[0078] [Bandwidth Part (BWP) Change]

[0079] If the UE has one or more bandwidth parts configured for it, the base station can instruct the UE to change (or switch or transition) the bandwidth part by using the bandwidth part indicator field in the DCI. As an example, if the UE's currently activated bandwidth part is Figure 3 If the bandwidth part #1 301 in the DCI is received, the base station may indicate the bandwidth part #2 302 using the bandwidth part indicator in the DCI, and the UE may change the bandwidth part to the bandwidth part #2 302 indicated by the bandwidth part indicator in the received DCI.

[0080] As described above, the DCI-based bandwidth part change can be indicated by the DCI for scheduling PDSCH or PUSCH, and therefore, upon receiving the bandwidth part change request, the UE needs to be able to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI in the changed bandwidth part without any problems. To this end, the requirement for the delay time (TBWP) required during the bandwidth part change is specified in the standard and can be defined, for example, as given in Table 3 below.

[0081] [Table 3]

[0082] The requirement for bandwidth part change delay time can support type 1 or type 2, depending on the capability of the UE. The UE can report the supported bandwidth part change delay time type to the base station. If the UE receives a DCI including a bandwidth part change indicator in time slot n, then according to the above requirement for bandwidth part change delay time, the UE can change the bandwidth part change delay time no later than time slot n+T BWP The change to the new bandwidth part indicated by the bandwidth part change indicator is completed at a time point of , and the data channel scheduled by the corresponding DCI can be transmitted / received in the newly changed bandwidth part. In addition, the UE can transmit / receive the data channel scheduled by the corresponding DCI in the changed new bandwidth part. According to an embodiment, if the base station wants to schedule the data channel by using the new bandwidth part, the base station can change the delay time (T) based on the bandwidth part of the UE. BWP ) to determine the time domain resource allocation for the data channel. That is, when scheduling the data channel by using the new bandwidth part, in combination with the method for determining the time domain resource allocation for the data channel, the base station may schedule the corresponding data channel after the bandwidth part change delay time. Therefore, the UE may not expect that the DCI indicating the bandwidth part change will indicate a value less than the bandwidth part change delay time (T BWP ) time slot offset (K0 or K2) value.

[0083] If a UE receives a DCI indicating a bandwidth fraction change (e.g., DCI format 1_1 or 0_1), the UE may not perform transmission or reception during a time interval from the third symbol of the slot in which the PDCCH including the corresponding DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the corresponding DCI. For example, if the UE receives a DCI indicating a bandwidth fraction change in slot n, and if the slot offset value indicated by the corresponding DCI is K, the UE may not perform transmission or reception from the third symbol of slot n to a symbol before slot n+K (e.g., the last symbol of slot n+K-1).

[0084] [SS / PBCH block]

[0085] Next, the synchronization signal (SS) / PBCH block in 5G will be described.

[0086] The SS / PBCH block may refer to a physical layer channel block including the primary synchronization signal (PSS), the secondary synchronization signal (SSS), and the PBCH. Details are as follows.

[0087] - PSS: A signal that serves as a reference for downlink time / frequency synchronization and provides partial information of the cell ID.

[0088] - SSS: A reference for downlink time / frequency synchronization and can provide residual cell ID information not provided by PSS. Additionally, SSS can be used as a reference signal for PBCH demodulation of PBCH.

[0089] PBCH: This MIB provides mandatory system information necessary for UEs to transmit and receive data and control channels. This mandatory system information may include search space-related control information indicating radio resource mapping information for control channels, scheduling control information regarding a separate data channel for transmitting system information, and more.

[0090] - SS / PBCH block: can include a combination of PSS, SSS and PBCH. One or more SS / PBCH blocks can be transmitted in a 5 ms time period, and each transmitted SS / PBCH block can be distinguished by an index.

[0091] During the initial access phase, the UE can detect the PSS and SSS and decode the PBCH. The UE can retrieve the MIB from the PBCH and use it to configure Control Resource Set (CORESET) #0 (which may correspond to the CRESET with CRESET index 0). Assuming that the demodulation reference signal (DMRS) transmitted in the selected SS / PBCH block and CRESET #0 are quasi-co-located (QCL), the UE can monitor CRESET #0. The UE can use the downlink control information transmitted in CRESET #0 to receive system information. From this received system information, the UE can retrieve configuration information related to the random access channel (RACH) necessary for initial access. Based on the selected SS / PBCH block index, the UE can transmit a physical RACH (PRACH) to the base station. Upon receiving the PRACH, the base station can obtain information about the SS / PBCH block index selected by the UE. The base station can then identify which block the UE has selected from the corresponding SS / PBCH blocks and that CRESET #0, associated with it, is being monitored.

[0092] [PDCCH: About DCI]

[0093] Next, downlink control information (DCI) in the 5G system will be described in detail.

[0094] In 5G systems, scheduling information about uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a UE via DCI. The UE can monitor both fallback and non-fallback DCI formats for PUSCH or PDSCH. The fallback DCI format may include fixed fields predefined between the base station and the UE, while the non-fallback DCI format may include configurable fields.

[0095] The DCI may be subjected to channel coding and modulation processing, and then transmitted through the physical downlink control channel (PDCCH) after the channel coding and modulation processing. A cyclic redundancy check (CRC) may be attached to the payload of the DCI message, and the CRC may be scrambled by a radio network temporary identifier (RNTI) corresponding to the identity of the UE. Different RNTIs may be used depending on the purpose of the DCI message (e.g., UE-specific data transmission, power control command, or random access response). That is, the RNTI may not be explicitly transmitted, but may be transmitted when included in the CRC calculation process. After receiving the DCI message transmitted through the PDCCH, the UE may identify the CRC by using the allocated RNTI, and if the CRC identification result is correct, the UE may know that the corresponding message has been transmitted to the UE.

[0096] For example, the DCI used to schedule the PDSCH for system information (SI) can be scrambled by the SI-RNTI. The DCI used to schedule the PDSCH for the random access response (RAR) message can be scrambled by the RA-RNTI. The DCI used to schedule the PDSCH for the paging message can be scrambled by the P-RNTI. The DCI used to notify the slot format indicator (SFI) can be scrambled by the SFI-RNTI. The DCI used to notify the transmit power control (TPC) can be scrambled by the TPC-RNTI. The DCI used to schedule the UE-specific PDSCH or PUSCH can be scrambled by the cell RNTI (C-RNTI).

[0097] DCI format 0_0 may be used as a fallback DCI for scheduling PUSCH, and in this case, the CRC may be scrambled by the C-RNTI. DCI format 0_0 in which the CRC is scrambled by the C-RNTI may include the following pieces of information, for example, as given in Table 4 below.

[0098] [Table 4]

[0099] 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 the C-RNTI. DCI format 0_1 ​​in which the CRC is scrambled by the C-RNTI may include the following pieces of information, for example, as given in Table 5 below.

[0100] [Table 5]

[0101] DCI format 1_0 may be used as a fallback DCI for scheduling PDSCH, and in this case, the CRC may be scrambled by the C-RNTI. DCI format 1_0 in which the CRC is scrambled by the C-RNTI may include the following pieces of information, for example, as given in Table 6 below.

[0102] [Table 6]

[0103] DCI format 1_1 may be used as a non-fallback DCI for scheduling PDSCH, and in this case, the CRC may be scrambled by the C-RNTI. DCI format 1_1 in which the CRC is scrambled by the C-RNTI may include the following pieces of information, for example, as given in Table 7 below.

[0104] [Table 7]

[0105] [PDCCH: CORESET, REG, CCE, and Search Space] Hereinafter, a downlink control channel in a 5G communication system will be described in more detail with reference to the accompanying drawings.

[0106] Figure 4 An example of a control resource set (CORESET) for transmitting a downlink control channel in a 5G wireless communication system is shown.

[0107] Figure 4 An example is shown in which a UE bandwidth portion 410 is configured along the frequency axis and two control resource sets (control resource set #1 401 and control resource set #2 420) are configured within a time slot 402 along the time axis. Control resource sets 401 and 402 may be configured in specific frequency resources 410 within the entire UE bandwidth portion 403 along the frequency axis. Control resource sets 401 and 402 may each be configured as one or more OFDM symbols along the time domain, and the number of OFDM symbols may be defined as a control resource set duration 404. Figure 4In the illustrated example, control resource set #1 401 is configured to have a control resource set duration corresponding to two symbols, and control resource set #2 402 is configured to have a control resource set duration corresponding to one symbol.

[0108] The base station can configure the control resource set in the 5G network for the UE through higher-layer signaling (e.g., system information, master information block (MIB), radio resource control (RRC) signaling). The description of configuring the control resource set for the UE means providing information such as the control resource set identifier, the frequency location of the control resource set, and the symbol duration of the control resource set. For example, the control resource set may include the following information as shown in Table 8 below.

[0109] [Table 8]

[0110] In Table 8, the tci-StatesPDCCH (abbreviated as transmission configuration indication (TCI) state) configuration information may include information of one or more SS / PBCH block indices or channel state information reference signal (CSI-RS) indices quasi-co-located (OCL) with the DMRS transmitted in the corresponding control resource set.

[0111] Figure 5 The structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 5 An example of the basic units of time and frequency resources that constitute the downlink control channels available in 5G is shown.

[0112] according to Figure 5 The basic unit of time and frequency resources constituting the control channel may be referred to as a resource element group (REG) 503. A REG 503 may be defined by one OFDM symbol 501 along the time axis and one physical resource block (PRB) 502 (i.e., 12 subcarriers) along the frequency axis. The base station may configure a downlink control channel allocation unit by concatenating REGs 503.

[0113] Assume that Figure 5 As shown, the basic unit of downlink control channel allocation in 5G is the control channel element 504. A CCE 504 may include multiple REGs 503. Figure 5As shown in FIGURE 5, REG 503, for example, may include 12 REs, and if a CCE 504 includes six REGs 503, then the CCE 504 may include 72 REs. Once configured, a downlink control resource set may include multiple CCEs 504, and depending on the aggregation level (AL) in the control resource set, a specific downlink control channel may be mapped to one or more CCEs 504 and then transmitted. The CCEs 504 in the control resource set are distinguished by number, and the CCE 504 numbers may be assigned according to a logical mapping scheme.

[0114] Figure 5 The basic unit of the downlink control channel shown (ie, REG 503) may include both REs to which DCI is mapped and regions to which reference signals (DMRS 505) for decoding the same are mapped. Figure 5 In the embodiment of the present invention, three DMRS 503 can be transmitted within one REG 505. Depending on the aggregation level (AL), the number of CCEs necessary to transmit the PDCCH can be 1, 2, 4, 8, 16, and different numbers of CCEs can be used to achieve link adaptation of the downlink control channel. For example, in the case of AL=L, one downlink control channel can be transmitted by L CCEs. The UE needs to detect the signal when there is no information about the downlink control channel, and therefore a search space indicating a set of CCEs has been defined for blind decoding. The search space is a set of downlink control channel candidates including CCEs that the UE needs to try to decode on a given AL, and since 1, 2, 4, 8 or 16 CCEs can constitute a bundle at each AL, the UE can have multiple search spaces. A search space set can be defined as a set of search spaces at all configured aggregation levels.

[0115] The search space can be classified into a common search space and a UE-specific search space. A group of UEs or all UEs can search the common search space of the PDCCH in order to receive cell common control information, such as dynamic scheduling or paging messages about system information. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, etc., can be received by searching the common search space of the PDCCH. In the case of a common search space, a group of UEs or all UEs need to receive the PDCCH, and therefore the common search space can be defined as a set of predetermined CCEs. Scheduling allocation information about UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be UE-specifically defined as a function of various system parameters and UE identification.

[0116] In 5G, the base station can configure parameters for the PDCCH search space for the UE through upper layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the base station can configure the UE with configurations such as the number of PDCCH candidate groups at each aggregation level L, the monitoring period for the search space, the monitoring timing for each symbol in the time slot of the search space, the search space type (common search space or UE-specific search space), the combination of RNTI and DCI format to be monitored in the corresponding search space, and the control resource set index used to monitor the search space. For example, the control resource set may include the following multiple pieces of information given in Table 9 below.

[0117] [Table 9]

[0118] Based on the configuration information, the base station may configure one or more search space sets for the UE. According to some embodiments, the base station may configure search space set 1 and search space set 2 for the UE, may configure DCI format A scrambled by X-RNTI to be monitored in the common search space in search space set 1, and may configure DCI format B scrambled by Y-RNTI to be monitored in the UE-specific search space in search space set 2. Based on the configuration information, one or more search space sets may exist in the common search space or the UE-specific search space. For example, search space set #1 and search space set #2 may be configured as common search spaces, and search space set #3 and search space set #4 may be configured as UE-specific search spaces.

[0119] The following combinations of DCI formats and RNTIs may be monitored in the common search space.

[0120] 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

[0121] DCI format 2_0 with CRC scrambled by SFI-RNTI

[0122] DCI format 2_1 with CRC scrambled by INT-RNTI

[0123] DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0124] DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0125] The following combinations of DCI formats and RNTIs may be monitored in the UE-specific search space.

[0126] DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0127] DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0128] The enumerated RNTIs may follow the definitions and usages given below:

[0129] Cell RNTI (C-RNTI): used to schedule UE-specific PDSCH

[0130] Temporary cell RNTI (TC-RNTI): used to schedule UE-specific PDSCH

[0131] Configured Scheduling RNTI (CS-RNTI): used to schedule semi-statically configured UE-specific PDSCH

[0132] Random Access RNTI (RA-RNTI): used to schedule PDSCH in the random access step

[0133] Paging RNTI (P-RNTI): used to schedule the PDSCH in which paging is transmitted

[0134] System Information RNTI (SI-RNTI): used to schedule the PDSCH in which system information is transmitted

[0135] Interrupt RNTI (INT-RNTI): used to indicate whether to puncture PDSCH

[0136] Transmit power control for PUSCH RNTI (TPC-PUSCH-RNTI): used to indicate power control commands for PUSCH

[0137] Transmit power control for PUCCH RNTI (TPC-PUCCH-RNTI): used to indicate power control commands for PUCCH

[0138] Transmit Power Control for SRS RNTI (TPC-SRS-RNTI): used to indicate power control commands for SRS

[0139] For example, the DCI formats enumerated above may follow the definition given in the following Table 10. However, the present disclosure is not limited thereto.

[0140] [Table 10]

[0141] In 5G, the search space at aggregation level L combining the control resource set p and the search space set s can be expressed by the following equation.

[0142] [Equation 1]

[0143] - L: Aggregation level

[0144] - : Carrier index

[0145] - : The total number of CCEs in the control resource set p

[0146] - : time slot index

[0147] - : The number of PDCCH candidates at aggregation level L

[0148] - = 0, ..., -1: PDCCH candidate index at aggregation level L

[0149] - = 0, ..., -1

[0150] - , , , , ,

[0151] - :UE ID

[0152] In the case of a public search space, The value may correspond to 0. The value may correspond to a value that changes by the identity of the UE (C-RNTI or an ID configured by the base station for the UE) and by a time index in the case of a UE-specific search space.

[0153] In 5G, multiple search space sets can be configured with different parameters (e.g., the parameters in Table 10), and the group of search space sets monitored by the UE at each time point can vary. For example, if search space set #1 is configured with an X-slot periodicity, if search space set #2 is configured with a Y-slot periodicity, and if X and Y are different, the UE can monitor both search space set #1 and search space set #2 in a specific time slot, and can monitor one of search space set #1 and search space set #2 in another specific time slot.

[0154] [PDCCH: span]

[0155] In the case where a UE has multiple PDCCH monitoring opportunities within a time slot, the UE can perform UE capability reporting at each subcarrier spacing, and in this regard, the concept of "span" can be used. A span refers to consecutive symbols configured so that the UE can monitor the PDCCH within a time slot, and each PDCCH monitoring opportunity is within a span. A span can be described by (X, Y), where X refers to the minimum number of symbols that separate the first symbols of two consecutive spans from each other, and Y refers to the number of consecutive symbols configured so that the PDCCH can be monitored within one span. The UE can monitor the PDCCH within a range corresponding to Y symbols from the first symbol of the span within the span.

[0156] Figure 6 The span shows that in a wireless communication system, a UE can have multiple PDCCH monitoring opportunities within a time slot. The possible spans are (X, Y) = (7, 3), (4, 3), (2, 2), and these three cases are Figure 6 In the time slot, the PDCCH monitoring opportunities are indicated by "6-00", "6-05", and "6-10", respectively. For example, "6-00" may describe a case where there are two spans described by (7, 4) within the time slot. The interval between the first symbols of the two spans is described as X=7, the PDCCH monitoring opportunities may exist within a total of Y=3 symbols from the first symbol of each span, and search spaces 1 and 2 may exist within Y=3 symbols, respectively. As another example, "6-05" may describe a case where there are three spans described by (4, 3) within the time slot, and the second and third spans are separated by X'=5 symbols, which is greater than X=4.

[0157] [PDCCH: UE capability report]

[0158] The slot positions where the common search space and the UE-specific search space are located are indicated by the parameter "monitoringSymbolsWithinSlot" in Table 13-1, and the symbol positions within the slot are indicated as a bitmap by the parameter "monitoringSymbolsWithinSlot" in Table 9. At the same time, the symbol positions within the slot in which the UE can monitor the search space can be reported to the base station through the following UE capabilities.

[0159] - UE Capability 1 (hereinafter referred to as FG 3-1). This UE capability may have the following meaning: if there is one monitoring opportunity (MO) for Type 1 and Type 3 common search spaces or UE-specific search spaces within a time slot, as shown in Table 11 below, then the UE may monitor the corresponding MO when the corresponding MO is within the first three symbols within the time slot. This UE capability is a mandatory capability supported by all UEs supporting NR, and whether UE Capability 1 is supported is not explicitly reported to the base station.

[0160] [Table 11]

[0161] - UE Capability 2 (hereinafter referred to as FG 3-2). This UE capability has the following meaning: if there is a monitoring opportunity (MO) for the common search space or UE-specific search space within a time slot, as shown in Table 12 below, the UE can monitor the corresponding MO regardless of the starting symbol position of the corresponding MO. This UE capability is optionally supported by the UE, and whether it is supported is explicitly reported to the base station.

[0162] [Table 12]

[0163] - UE Capability 3 (hereinafter referred to as FG 3-5, 3-5a, or 3-5b). This UE capability has the following meaning: if multiple monitoring opportunities (MOs) exist within a slot for a common search space or a UE-specific search space, as shown in Table 13 below, it indicates the pattern of MOs that the UE can monitor. This pattern includes the interval X between the starting symbols of different MOs and the maximum symbol length Y for a single MO. The (X, Y) combinations supported by the UE can be one or more of {(2, 2), (4, 3), and (7, 3)}. This UE capability is optionally supported by the UE, and it explicitly reports to the base station whether the (X, Y) combination is supported.

[0164] [Table 13]

[0165] The UE may report to the base station whether it supports the above-mentioned UE capability 2 and / or UE capability 3 and related parameters. The base station may allocate time domain resources to the common search space and UE-specific search space based on the UE capability report. During resource allocation, the base station may ensure that the MO is not located in a position that the UE cannot monitor.

[0166] [QCL, TCI status]

[0167] In wireless communication systems, one or more different antenna ports (which can also be replaced by one or more channels, signals, or combinations thereof, but for ease of description, will be referred to as different antenna ports below) can be associated with each other via a quasi-co-location (QCL) configuration, as shown in Table 3 below. The TCI state is used to indicate the QCL relationship between a PDCCH (or PDCCH DRMS) and another RS ​​or channel. The description of a reference antenna port A (reference RS #A) and another destination antenna port B (target RS #B) as quasi-co-located allows the UE to apply some or all of the large-scale channel parameters estimated for antenna port A to the channel measurement results from antenna port B. QCL needs to be associated with different parameters depending on the situation: 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, or 4) beam management (BM) affected by spatial parameters. Therefore, four types of QCL relationships are supported in NR, as shown in Table 3 below.

[0168] [Table 14]

[0169] Spatial RX parameters may refer to some or all of various parameters, such as angle of arrival (AoA), power angular spectrum (PAS) of AoA, angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0170] The QCL relationship can be configured for the UE through the RRC parameters TCI-State and QCL-Info as shown in Table 4 below. Referring to Table 15, the base station can configure one or more TCI states for the UE, thereby notifying up to two types of QCL relationships (qcl-Type1, qcl-Type2) regarding the RS (i.e., target RS) with the ID of the TCI state. Each piece of QCL information (QCL-Info) included in each TCI state includes the serving cell index and the BWP index of the reference RS indicated by the corresponding QCL information, the type and ID of the reference RS, and the QCL type as shown in Table 14 above.

[0171] [Table 15]

[0172] Figure 7 An example of base station beam allocation according to TCI state configuration in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 7 , the base station can transmit information about N different beams to the UE through N different TCI states. Figure 7 In the case of N=3, the base station can configure the qcl-Type2 parameters included in the three TCI states 700, 705 and 710 in QCL type D (when associated with CSI-RS or SSB corresponding to different beams), thereby notifying that the antenna ports involved in different TCI states 700, 705 and 710 are associated with different spatial Rx parameters (i.e., different beams).

[0173] Tables 16 to 20 below enumerate valid TCI state configurations according to the target antenna port type.

[0174] Table 16 lists the valid TCI state configurations when the target antenna port is a tracking CSI-RS (TRS). A TRS may refer to an NZP CSI-RS with no repetition parameter configured and trs-Info set to "true" in a CSI-RS. In Table 16, configuration 3 may be used for aperiodic TRS.

[0175] [Table 16]

[0176] Table 17 lists the valid TCI state configurations when the target antenna port is a CSI-RS for CSI. The CSI-RS for CSI may refer to an NZP CSI-RS that is not configured with a parameter indicating repetition (e.g., a repetition parameter) and whose trs-Info is configured as "true".

[0177] [Table 17]

[0178] Table 18 enumerates the valid TCI state configurations when the target antenna port is a CSI-RS for beam management (BM) (which has the same meaning as the CSI-RS for L1RSRP reporting). CSI-RS for BM refers to an NZP CSI-RS for which the repetition parameter in the CSI-RS is configured to have a value of "on" or "off" and whose trs-Info is not configured to "true".

[0179] [Table 18]

[0180] Table 19 enumerates the valid TCI state configurations when the target antenna port is PDCCH DMRS.

[0181] [Table 19]

[0182] Table 20 enumerates the valid TCI state configurations when the target antenna port is PDSCH DMRS.

[0183] [Table 20]

[0184] According to the representative QCL configuration method based on Tables 16 to 20 above, the target antenna port and reference antenna port for each step are configured and operated as follows: "SSB" -> "TRS" -> "CSI-RS for CSI, or CSI-RS for BM, or PDCCH DMRS, or PDSCH DMRS." Therefore, the reception operation of the UE can be facilitated by associating statistical characteristics that can be measured from the SSB and TRS with the corresponding antenna port.

[0185] [PDCCH: About TCI status]

[0186] The specific TCI state combinations applicable to PDCCH DMRS antenna ports can be given in the following Table 21. The fourth row in Table 21 corresponds to the combination assumed by the UE before RRC configuration and cannot be configured after RRC.

[0187] [Table 21]

[0188] Figure 8 An example of a method for TCI state allocation on PDCCH in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 8 A hierarchical signaling approach is shown for dynamic allocation of PDCCH beams.

[0189] refer to Figure 8 , the base station may configure N TCI states 805, 810, ..., 820 for the UE through RRC signaling 800, and may configure some of the states as TCI states for the CORESET (825). The base station may then indicate one of the TCI states 830, 835, and 840 of the CORESET to the UE through MAC CE signaling (845). The UE may then receive the PDCCH based on the beam information included in the TCI state indicated by the MAC CE signaling.

[0190] Figure 9 The TCI indication MACCE signaling structure of the PDCCH DMRS in a wireless communication system according to an embodiment of the present disclosure is shown.

[0191] refer to Figure 9 , the TCI indication MAC CE signaling of the PDCCH DMRS can be configured by 2 bytes (16 bits) and includes a 5-bit serving cell ID 915 , a 4-bit CORESET ID 920 and a 7-bit TCI state ID 925 .

[0192] Figure 10 An example of beam configuration and search space regarding a control resource set in a wireless communication system according to an embodiment of the present disclosure is shown.

[0193] refer to Figure 10 , the base station can indicate one of the TCI state lists included in the CORESET 1000 configuration through MAC CE signaling (1005). Until different TCI states are indicated to the corresponding CORESET through different MAC CE signaling, the UE can consider applying the same QCL information (beam #1) 1005 to all one or more search spaces 1010, 1015, and 1020 connected to the CORESET. The above-mentioned PDCCH beam allocation method may have problems in that it is difficult to indicate beam changes faster than the MAC CE signaling delay, and the same beam is unilaterally applied to each CORESET regardless of the search space characteristics, thereby making it difficult to perform flexible PDCCH beam operation. The following embodiments of the present disclosure provide more flexible PDCCH beam configuration and operation methods. Although a number of different examples will be provided for the convenience of describing the embodiments of the present disclosure, they are not mutually exclusive and can be appropriately combined and applied for each situation.

[0194] The base station can configure one or more TCI states for a specific control resource set for the UE and activate one of the configured TCI states via a MAC CE activation command. For example, if {TCI state #0, TCI state #1, TCI state #2} are configured as the TCI states for control resource set #1, the base station can transmit an activation command to the UE via a MAC CE, assuming TCI state #0 as the TCI state for control resource set #1. Based on the activation command for the TCI state received via the MAC CE, the UE can correctly receive the DMRS for the corresponding control resource set based on the QCL information in the activated TCI state.

[0195] With respect to the control resource set with a configured index of 0 (control resource set #0), if the UE fails to receive a MAC CE activation command regarding the TCI state of control resource set #0, the UE may assume that the DMRS transmitted in CORESET #0 is already in QCL with the SS / PBCH block identified during the initial access procedure or in the non-contention-based random access procedure not triggered by a PDCCH command.

[0196] With respect to a control resource set having a configured index value other than 0 (control resource set #X), if the UE has no TCI state configured for control resource set #X, or if the UE has one or more TCI states configured for it but fails to receive a MAC CE activation command to activate one of them, the UE may assume that the DMRS transmitted in control resource set #X is already in QCL with the SS / PBCH block identified during the initial access procedure.

[0197] [PDCCH: About QCL prioritization rules]

[0198] Hereinafter, an operation for determining the QCL priority with respect to the PDCCH will be described in detail.

[0199] The UE may operate in accordance with carrier aggregation within a single cell or frequency band. If the UE operates in accordance with carrier aggregation within a single cell or frequency band and multiple control resource sets within the activated bandwidth portion within a single cell or multiple cells overlap in time and have the same or different QCL-TypeD characteristics in a specific PDCCH monitoring opportunity, the UE may select a specific control resource set based on the QCL priority determination operation and may monitor a control resource set having the same QCL-TypeD characteristics as the corresponding control resource set. That is, if multiple control resource sets overlap in time, only one QCL-TypeD characteristic may be received. The QCL priority may be determined according to the following criteria.

[0200] - Criterion 1. A control resource set connected to a common search space having the lowest index within a cell corresponding to the lowest index among cells including the common search space

[0201] - Criterion 2. A control resource set connected to a UE-specific search space having the lowest index within a cell corresponding to the lowest index among cells including the UE-specific search space

[0202] As described above, if one of these criteria is not met, the next criterion may be applied. For example, if the control resource sets overlap in time in a particular PDCCH monitoring opportunity, and if all control resource sets are not connected to a common search space but to a UE-specific search space (e.g., if criterion 1 is not met), the UE may omit the application of criterion 1 and apply criterion 2.

[0203] If a control resource set is selected according to the above criteria, the UE may additionally consider two aspects regarding the QCL information configured for the control resource set. First, if control resource set 1 has CSI-RS 1 as a reference signal with a QCL-Type D relationship, if this CSI-RS 1 has a QCL-Type D relationship with reference signal SSB 1, and if another control resource set 2 has a QCL-Type D relationship with reference signal SSB 1, then the UE may consider that the two control resource sets 1 and 2 have different QCL-Type D characteristics. Second, if control resource set 1 has CSI-RS 1 configured for cell 1 as a reference signal with a QCL-Type D relationship, if this CSI-RS 1 has a QCL-Type D relationship with reference signal SSB 1, if control resource set 2 has a QCL-Type D relationship with reference signal CSI-RS 2 configured for cell 2, and if this CSI-RS 2 has a QCL-Type D relationship with the same reference signal SSB 1, then the UE may consider that the two control resource sets have the same QCL-Type D characteristics.

[0204] For reference, Figure 12 A method is shown in which, after receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure, a UE selects a receivable control resource set in consideration of a priority.

[0205] [About rate matching / puncturing]

[0206] Hereinafter, the rate matching operation and the puncturing operation will be described in detail.

[0207] If time and frequency resource A for transmitting symbol sequence A overlaps with time and frequency resource B, then considering resource C (the area where resource A and resource B overlap), rate matching or puncturing operations can be considered as operations of transmit / receive channel A. Specific operations can follow the following description.

[0208] Rate matching operation

[0209] - The base station may transmit channel A after mapping channel A to only the remaining resource region of the entire resource A, excluding resource C (the region overlapping with resource B), to be used to transmit the symbol sequence A to the UE. For example, if symbol sequence A is configured as {symbol #1, symbol #2, symbol #3, symbol #4}, if resource A is {resource #1, resource #2, resource #3, resource #4}, and if resource B is {resource #3, resource #5}, the UE may receive symbol sequence A based on the assumption that symbol sequence A has been sequentially mapped to the remaining resources {resource #1, resource #2, resource #4}, excluding {resource #3} (corresponding to resource C) in resource A. Therefore, the base station may transmit the symbol sequence {symbol #1, symbol #2, symbol #3} after mapping it to {resource #1, resource #2, resource #4}, respectively.

[0210] The UE can evaluate resource A and resource B based on scheduling information regarding symbol sequence A from the base station, thereby evaluating resource C (the overlapping region of resource A and resource B). The UE can receive symbol sequence A based on the assumption that it has been mapped and transmitted throughout the remaining region of resource A, excluding resource C. For example, if symbol sequence A is configured as {symbol #1, symbol #2, symbol #3, symbol #4}, if resource A is {resource #1, resource #2, resource #3, resource #4}, and if resource B is {resource #3, resource #5}, the UE can receive symbol sequence A based on the assumption that it has been sequentially mapped to the remaining resources {resource #1, resource #2, resource #4} of resource A, excluding {resource #3} (corresponding to resource C). Therefore, the UE can perform the following series of reception operations based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #3} has been transmitted after being respectively mapped to {resource #1, resource #2, resource #4}.

[0211] Pruning

[0212] If resource C (a region overlapping with resource B) exists in the entire resource A to be used to transmit symbol sequence A to the UE, the base station can map symbol sequence A to the entire resource A, but may not perform transmission in the resource region corresponding to resource C, and may perform transmission only with respect to the remaining resource region in resource A except resource C. For example, if symbol sequence A is configured as {symbol #1, symbol #2, symbol #3, symbol #4}, if resource A is {resource #1, resource #2, resource #3, resource #4}, and if resource B is {resource #3, resource #5}, the UE may assume that symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} is mapped to resource A {resource #1, resource #2, resource #3, resource #4}, respectively, but {symbol #3} mapped to {resource #3} (corresponding to resource C) is not transmitted. Based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources {resource #1, resource #2, resource #4} in resource A, excluding {resource #3} (corresponding to resource C), has been mapped and transmitted, the UE may receive the symbol sequence. Therefore, the base station may transmit the symbol sequence {symbol #1, symbol #2, symbol #4} after mapping it to {resource #1, resource #2, resource #4}, respectively.

[0213] The UE can evaluate resource A and resource B based on the scheduling information about symbol sequence A from the base station, thereby estimating resource C (the region where resource A and resource B overlap). The UE can receive symbol sequence A based on the assumption that symbol sequence A has been mapped to the entire resource A but is transmitted only in the remaining region of resource A excluding resource C. For example, if symbol sequence A is configured as {symbol #1, symbol #2, symbol #3, symbol #4}, if resource A is {resource #1, resource #2, resource #3, resource #4}, and if resource B is {resource #3, resource #5}, the UE can assume that the symbol sequence A {symbol #1, symbol #2, symbol #3, symbol #4} is mapped to resource A {resource #1, resource #2, resource #3, resource #4} respectively, but does not transmit {symbol #3} mapped to {resource #3} (corresponding to resource C), and based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #4} corresponding to the remaining resources {resource #1, resource #2, resource #4} in resource A except {resource #3} (corresponding to resource C) has been mapped and transmitted, the UE can receive the symbol sequence. Therefore, the UE can perform a series of the following reception operations based on the assumption that the symbol sequence {symbol #1, symbol #2, symbol #4} has been transmitted after being respectively mapped to {resource #1, resource #2, resource #4}.

[0214] Hereinafter, a method for configuring rate matching resources for the purpose of rate matching in a 5G communication system will be described. Rate matching refers to adjusting the size of a signal based on the amount of resources available for transmitting the signal. For example, data channel rate matching may mean that the data channel is not mapped and transmitted with respect to a specific time and frequency resource domain, and the size of the data is adjusted accordingly.

[0215] Figure 11 An example of a method in which a base station and a UE transmit / receive data in consideration of a downlink data channel and rate matching resources in a wireless communication system according to an embodiment of the present disclosure is shown.

[0216] Figure 11 A physical downlink data channel (PDSCH) 1101 and rate matching resources 1102 are shown. A base station can configure one or more rate matching resources 1102 for a UE through higher-layer signaling (e.g., RRC signaling). Rate matching resource 1102 configuration information may include time-domain resource allocation information 1103, frequency-domain resource allocation information 1104, and periodicity information 1105. The bitmap corresponding to frequency-domain resource allocation information 1104 will be referred to as the "first bitmap," the bitmap corresponding to time-domain resource allocation information 1103 will be referred to as the "second bitmap," and the bitmap corresponding to periodicity information 1105 will be referred to as the "third bitmap." If all or some of the time and frequency resources of the scheduled PDSCH 1101 overlap with the configured rate matching resources 1102, the base station may rate-match the data channel 1102 in the rate matching resource 1101 portion and transmit the data channel. The UE can then receive and decode the data channel 1102 assuming that the data channel 1102 has been rate-matched in the rate matching resource 1101 portion.

[0217] The base station can dynamically notify the UE via DCI whether rate matching will be performed on the PDSCH in the configured rate matching resource portion by using an additional configuration (e.g., corresponding to the "rate matching indicator" within the aforementioned DCI format). Specifically, the base station can select some of the configured rate matching resources and group them into rate matching resource groups. The base station can then indicate to the UE via DCI using a bitmap type whether rate matching will be performed on the PDSCH for each rate matching resource group. For example, if four rate matching resources RMR#1, RMR#2, RMR#3, and RMR#4 are configured, the base station can configure rate matching group RMG#1 = {RMR#1, RMR#2} and RMG#2 = {RMR#3, RMR#4}. The base station can then indicate to the UE via a bitmap using two bits within the DCI field whether rate matching will occur in RMG#1 and RMG#2, respectively. For example, if rate matching is to be performed, the base station can indicate this with a "1," and if rate matching is not to be performed, the base station can indicate this with a "0."

[0218] 5G supports "RB symbol level" and "RE level" granularity as a method for configuring the above rate matching resources for the UE. More specifically, the following configuration method can be followed.

[0219] RB symbol level

[0220] The UE may have up to four RateMatchPattern configured for each bandwidth part through upper layer signaling, and one RateMatchPattern may include the following contents.

[0221] - Related to the reserved resources within the bandwidth part, resources in the time and frequency resource domains may be included, with the corresponding reserved resources configured as a combination of an RB-level bitmap and a symbol-level bitmap in the frequency domain. The reserved resources may span one or two time slots. A time domain pattern (periodicityAndPattern) may also be configured, where the time and frequency domains including the corresponding RB-level and symbol-level bitmap pairs are repeated.

[0222] - May include resource regions corresponding to a time domain pattern configured by time domain and frequency domain resource regions configured by a CORESET within a bandwidth part and a search space configuration in which the corresponding resource regions are repeated.

[0223] RE-level

[0224] The UE may have the following contents configured through upper layer signaling.

[0225] - Information about the configuration of REs corresponding to the LTE CRS (cell-specific reference signal or common reference signal) pattern (lte-CRS-ToMatchAround), which may include the port number of the LTE CRS (nrofCRS-Ports) and the LTE-CRS-vshift value (v-shift), the position information of the center subcarrier of the LTE carrier from the reference frequency point (e.g., reference point A) (carrierFreqDL), the bandwidth size of the LTE carrier (carrierBandwidthDL), and the subframe configuration information corresponding to the Multicast Broadcast Single Frequency Network (MBSFN) (mbsfn-SubframConfigList). The UE can determine the position of the CRS within the NR time slot corresponding to the LTE subframe based on the above information.

[0226] - May include configuration information about resource sets corresponding to one or more zero-power (ZP) CSI-RS within a bandwidth part.

[0227] [About LTE CRS rate matching]

[0228] Next, the rate matching process for the LTE CRS described above will be described in detail. In NR, to facilitate coexistence between Long Term Evolution (LTE) and New RAT (NR) (LTE-NR coexistence), the LTE cell-specific reference signal (CRS) pattern can be configured for NR UEs. More specifically, the CRS pattern can be provided by RRC signaling including at least one parameter within the ServingCellConfig IE (information element) or the ServingCellConfigCommon IE. Examples of parameters may include lte-CRS-ToMatchAround, lte-CRS-PatternList1-r16, lte-CRS-PatternList2-r16, crs-RateMatch-PerCORESETPoolIndex-r16, etc.

[0229] Rel-15 NR provides the ability to configure one CRS pattern for each serving cell via the parameter lte-CRS-ToMatchAround. In Rel-16 NR, the above functionality has been extended so that multiple CRS patterns can be configured for each serving cell. More specifically, a UE with a single TRP (transmit and receive point) configuration can now have one CRS pattern configured for each LTE carrier, and a UE with a multi-TRP configuration can have two CRS patterns configured for each LTE carrier. For example, a UE with a single TRP configuration can have up to three CRS patterns configured for each serving cell via the parameter lte-CRS-PatternList1-r16. As another example, a UE with a multi-TRP configuration can have a CRS configured for each TRP. That is, the CRS pattern for TRP1 can be configured via the parameter lte-CRS-PatternList1-r16, and the CRS pattern for TRP2 can be configured via the parameter lte-CRS-PatternList2-r16. If two TRPs are configured as described above, whether the CRS patterns of both TRP1 and TRP2 are applied to a specific physical downlink shared channel (PDSCH) or only the CRS pattern of one TRP is applied is determined by the parameter crs-RateMatch-PerCORESETPoolIndex-r16, where if the parameter crs-RateMatch-PerCORESETPoolIndex-r16 is configured as "enabled", only the CRS pattern of one TRP is applied, and in other cases, the two CRS patterns of the two TRPs are applied.

[0230] Table 22 shows ServingCellConfig IE including the CRS pattern, and Table 23 shows RateMatchPatternLTE-CRS IE including at least one parameter regarding the CRS pattern.

[0231] [Table 22]

[0232] [Table 23]

[0233] [PDSCH: Processing Time]

[0234] Next, we will describe the PDSCH processing time (PDSCH processing time). If the base station schedules the UE to transmit the PDSCH using DCI format 1_0, 1_1, or 1_2, the UE may need to use the PDSCH processing time indicated by the DCI to receive the PDSCH by applying the transmission method (modulation / demodulation and coding indicator index (MCS), demodulation reference signal related information, time and frequency resource allocation information, etc.). Taking this into account, the PUSCH preparation process time is defined in NR. The UE's PUSCH processing time can follow the equation given below.

[0235] [Equation 2]

[0236] T proc,1 = ( N 1 + d 1,1 + d 2 )( 2048 + 144 ) κ2 -μ T c + T ext

[0237] T described above in Equation 2 proc,1 Each parameter in can have the following meanings.

[0238] - N 1 : The number of symbols determined according to the UE processing capability 1 or 2 based on the UE's capabilities and the parameter set μ. If UE processing capability 1 is reported according to the UE capability report, then N 1 May have the values ​​in Table 24, and if UE processing capability 2 is reported and if the availability of UE processing capability 2 is configured by upper layer signaling, may have the values ​​in Table 25. Parameter set μ may correspond to μ PDCCH 、μ PDSCH 、μ UL The minimum value in order to make T proc,1 maximize, and μ PDCCH 、μ PDSCH 、μ UL It may refer to a parameter set of a PDCCH that schedules a PDSCH, a parameter set of a scheduled PDSCH, and a parameter set of an uplink channel in which HARQ-ACK is transmitted.

[0239] Table 24 below shows the PDSCH processing time in the case of PDSCH processing capability 1.

[0240] [Table 24]

[0241] Table 25 below shows the PDSCH processing time in the case of PDSCH processing capability 2.

[0242] [Table 25]

[0243] -κ: 64

[0244] - T ext : If the UE uses a shared spectrum channel access solution, the UE can calculate T ext And apply it to the PDSCH processing time. Otherwise, assume T ext is 0.

[0245] - If l1 indicating the PDSCH DMRS position value is 12, then N in [Table 24] above 1,0 has a value of 14, otherwise, has a value of 13.

[0246] - For PDSCH mapping type A, if the last symbol of the PDSCH is the i-th symbol in the slot in which the PDSCH is transmitted, and if i < 7, then d 1,1 is 7-i, otherwise d 1,1 is 0.

[0247] - d2: If a PUCCH with a high priority index overlaps in time with another PUCCH or PUSCH with a low priority index, d2 of the PUCCH with a high priority index may be configured as a value reported from the UE. Otherwise, d2 is 0.

[0248] - If PDSCH mapping type B is used for UE processing capability 1, then d 1,1 The value may be determined by the number of symbols (L) of the scheduled PDSCH and the number of overlapping symbols between the PDCCH that schedules the PDSCH and the scheduled PDSCH, as follows.

[0249] - If L ≥ 7, then d 1,1 = 0.

[0250] - If L ≥ 4 and L ≤ 6, then d 1,1 = 7 - L.

[0251] - If L = 3, then d 1,1 = min (d, 1).

[0252] - If L = 2, then d 1,1 = 3 + d.

[0253] - If PDSCH mapping type B is used for UE processing capability 2, then d 1,1 The value may be determined by the number of symbols (L) of the scheduled PDSCH and the number of overlapping symbols between the PDCCH that schedules the PDSCH and the scheduled PDSCH, as follows.

[0254] - If L ≥ 7, then d 1,1 = 0.

[0255] - If L ≥ 4 and L ≤ 6, then d 1,1 = 7 - L.

[0256] - If L = 2, - If the scheduling PDCCH exists within a CORESET consisting of three symbols, and if the CORESET and the scheduled PDSCH have the same starting symbol, then d 1,1 = 3.

[0257] - Otherwise, d 1,1 = d.

[0258] - In case the UE supports capability 2 within a given serving cell, if processingType2Enabled (upper layer signaling) is configured as "enabled" with respect to the corresponding cell, the UE may apply the PDSCH processing time based on UE processing capability 2.

[0259] If the position of the first uplink transmission symbol of the PUCCH including HARQ-ACK information (related to the corresponding position, K1 defined as the HARQ-ACK transmission time point, the PUCCH resource used to transmit HARQ-ACK, and the timing advance effect can be considered) is not earlier than T after the last symbol of the PDSCH proc,1 The UE needs to transmit a valid HARQ-ACK message starting from the first uplink transmission symbol of the scheduled time. That is, the UE needs to transmit a PUCCH including HARQ-ACK only when the PDSCH processing time is sufficient. Otherwise, the UE cannot provide the base station with valid HARQ-ACK information corresponding to the scheduled PDSCH. T can be used in both normal and extended CP cases. proc,1 In the case where PDSCH has two PDSCH transmission positions configured in one time slot, d is calculated with reference to the first PDSCH transmission position in the corresponding time slot. 1,1 .

[0260] [PDSCH: Reception preparation time during cross-carrier scheduling]

[0261] Next, the parameter set (μ) used to transmit the PDCCH for scheduling is PDCCH ) and a parameter set (μ PDSCH ) are different from each other in cross-carrier scheduling, the PDSCH reception preparation time (N) of the UE defined by the time interval between PDCCH and PDSCH will be described. pdsch ).

[0262] If μ PDCCH <μ PDSCH , the scheduled PDSCH cannot be scheduled within N symbols from the last symbol of the PDCCH that schedules the corresponding PDSCH pdsch The corresponding PDSCH transmission symbol may include DM-RS.

[0263] If μ PDCCH >μ PDSCH , then the N symbols from the last symbol of the PDCCH that schedules the corresponding PDSCH can be pdsch The scheduled PDSCH is transmitted after 1 symbol. The corresponding PDSCH transmission symbol may include DM-RS.

[0264] Table 26 shows the N according to the scheduled PDCCH subcarrier spacing. pdsch

[0265] [Table 26]

[0266] [About SRS] Next, we will describe an uplink channel estimation method using the UE's Sounding Reference Signal (SRS) transmission. The base station can configure at least one SRS configuration for each uplink BWP to transmit configuration information for SRS transmission to the UE. Furthermore, the base station can configure at least one SRS resource set for each SRS configuration. For example, the base station and the UE can exchange higher-layer signaling information as follows to transmit information about the SRS resource set.

[0267] - srs-ResourceSetId: SRS resource set index

[0268] - srs-ResourceIdList: A collection of SRS resource indexes referenced by the SRS resource set

[0269] - resourceType: The time domain transmission configuration of the SRS resource referenced by the SRS resource set, and can be configured as one of "periodic," "semi-persistent," and "aperiodic." If configured as "periodic" or "semi-persistent," associated CSI-RS information can be provided based on the location of the SRS resource set. If configured as "aperiodic," aperiodic SRS resource trigger list / slot offset information can be provided, and associated CSI-RS information can be provided based on the location of the SRS resource set.

[0270] - usage: Configuration regarding usage location of SRS resources referenced by an SRS resource set, and can be configured as one of "beamManagement", "codebook", "nonCodebook", and "antennaSwitching".

[0271] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter configuration for adjusting the transmit power of the SRS resources referenced by the SRS resource set.

[0272] The UE may understand that the SRS resources included in the SRS resource index set referenced by the SRS resource set follow the information configured for the SRS resource set.

[0273] In addition, the base station and the UE may transmit / receive upper layer signaling information in order to convey separate configuration information about the SRS resources. As an example, the separate configuration information about the SRS resources may include time-frequency domain mapping information within the time slot of the SRS resources, and this may include information about frequency hopping within or between time slots of the SRS resources. In addition, the separate configuration information about the SRS resources may include the time domain transmission configuration of the SRS resources, and may be configured as one of "periodic", "semi-persistent" and "aperiodic". The time domain transmission configuration of the SRS resources may be restricted to having the same time domain transmission configuration as the SRS resource set that includes the SRS resources. If the time domain transmission configuration of the SRS resources is "periodic" or "semi-persistent", the time domain transmission configuration may also include the SRS resource transmission period and time slot offset (e.g., periodicityAndOffset).

[0274] The base station can activate or deactivate SRS transmission for the UE through upper layer signaling, including RRC signaling or MAC CE signaling, or L1 signaling (e.g., DCI). For example, the base station can activate or deactivate periodic SRS transmission for the UE through upper layer signaling. The base station can indicate the activation of an SRS resource set with a resourceType configured as "periodic" through upper layer signaling, and the UE can transmit the SRS resources referenced by the activated SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource complies with the resource mapping information configured for the SRS resource, and the time slot mapping including the transmission period and time slot offset complies with the periodicityAndOffset configured for the SRS resource. In addition, the spatial domain transmit filter applied to the transmitted SRS resource can refer to the spatial relationship information configured for the SRS resource, or can refer to the associated CSI-RS configured for the SRS resource set including the SRS resource. The UE can transmit SRS resources within the uplink BWP activated for the periodic SRS resource activated by upper layer signaling.

[0275] For example, the base station may activate or deactivate semi-persistent SRS transmission for the UE through upper layer signaling. The base station may indicate the activation of the SRS resource set through MAC CE signaling, and the UE may transmit the SRS resource referenced by the activated SRS resource set. The SRS resource set activated through MAC CE signaling may be limited to the SRS resource set with resourceType configured as "semi-persistent". The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured for the SRS resource, and the time slot mapping including the transmission period and time slot offset follows the periodicityAndOffset configured for the SRS resource. In addition, the spatial domain transmit filter applied to the transmitted SRS resource may refer to the spatial relationship information configured for the SRS resource, or may refer to the associated CSI-RS information configured for the SRS resource set including the SRS resource. If the SRS resource is configured with spatial relationship information, the CSI-RS information may not be followed, but the spatial domain transmit filter may be determined by referring to the configuration information of the spatial relationship information transmitted by the MAC CE signaling that activates the semi-persistent SRS transmission. The UE may transmit SRS resources within the uplink BWP activated with respect to the semi-persistent SRS resources activated by upper layer signaling.

[0276] For example, a base station can trigger aperiodic SRS transmission by a UE via DCI. The base station can indicate one of the aperiodic SRS triggers (aperiodicSRS-ResourceTrigger) via the SRS Request field of the DCI. The UE can understand that, in the configuration information for the SRS resource set, the SRS resource set including the aperiodic SRS resource trigger indicated by the DCI in the aperiodic SRS resource trigger list has been triggered. The UE can transmit the SRS resources referenced by the triggered SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured for the SRS resource. In addition, the time slot mapping of the transmitted SRS resource can be determined by the time slot offset between the SRS resource and the PDCCH including the DCI, which can refer to a value included in the time slot offset set configured for the SRS resource set. Specifically, the value indicated in the time domain resource allocation field of the DCI among the offset values ​​included in the time slot offset set configured for the SRS resource set can be applied as the time slot offset between the SRS resource and the PDCCH including the DCI. In addition, the spatial domain transmit filter applied to transmit SRS resources may refer to spatial relationship information configured for the SRS resources, or may refer to the associated CSI-RS configured for the SRS resource set including the SRS resources. The UE may transmit SRS resources within the uplink BWP regarding aperiodic SRS resource activation triggered by DCI.

[0277] If the base station triggers the UE's aperiodic SRS transmission through DCI, a minimum time interval may be required between the transmitted SRS and the PDCCH including the DCI that triggers the aperiodic SRS transmission so that the UE transmits the SRS by applying the configuration information about the SRS resources. The time interval for the UE's SRS transmission can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers the aperiodic SRS transmission and the first symbol of the earliest transmitted SRS resource mapped to the transmitted SRS resources. The minimum time interval can be determined with reference to the PUSCH preparation process time required for the UE to prepare for PUSCH transmission. The minimum time interval can have different values ​​depending on the location where the SRS resource set including the transmitted SRS resources is used. For example, with reference to the UE's PUSCH preparation process time, the minimum time interval can be determined as N2 symbols defined in consideration of the UE processing capability that follows the UE's capabilities. In addition, if the location of use of the SRS resource set including the transmitted SRS resource is configured as "codebook" or "antenna switching", the minimum time interval may be determined as N2 symbols, and if the location of use of the SRS resource set is configured as "noncodebook" or "beam management", the minimum time interval may be determined as N2+14 symbols. If the time interval for aperiodic SRS transmission is longer than or equal to the minimum time interval, the UE may transmit the aperiodic SRS, and if the time interval for aperiodic SRS transmission is less than the minimum time interval, the DCI triggering the aperiodic SRS may be ignored.

[0278] Table 27 below shows the configuration information spatialRelationInfo.

[0279] [Table 27]

[0280] With reference to one reference signal, the configuration information spatialRelationInfo in Table 27 above may be applied to a beam for SRS transmission corresponding to the beam information of the corresponding reference signal. For example, the configuration of spatialRelationInfo may include the information in Table 28 below.

[0281] [Table 28]

[0282] With reference to the spatialRelationInfo configuration, the SS / PBCH block index, CSI-RS index, or SRS index may be configured as the index of the reference signal to be referenced in order to use the beam information of a specific reference signal. The upper layer signaling referenceSignal corresponds to configuration information indicating which reference signal beam information the corresponding SRS transmission is to reference, ssb-index may refer to the index of the SS / PBCH block, csi-RS-index may refer to the index of the CSI-RS, and srs may refer to the index of the SRS. If the upper layer signaling referenceSignal has a configuration value of "ssb-Index", the UE may apply the receive beam used to receive the SS / PBCH block corresponding to ssb-Index as the transmit beam for the corresponding SRS transmission. If the upper layer signaling referenceSignal has a configuration value of "'csi-RS-Index", the UE may apply the receive beam used to receive the CSI-RS corresponding to csi-RS-Index as the transmit beam for the corresponding SRS transmission. If the higher layer signaling referenceSignal has a configuration value of "'srs", the UE can apply the reception beam used to transmit the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0283] [PUSCH: About the launch plan]

[0284] Next, the PUSCH transmission scheduling scheme will be described. PUSCH transmission can be dynamically scheduled by UL grant in DCI, or operated with the help of configured grant type 1 or type 2. Dynamic scheduling indication for PUSCH transmission can be made by DCI format 0_0 or 0_1.

[0285] PUSCH transmissions of the configured grant type 1 can be semi-statically configured by upper layer signaling by receiving configuredGrantConfig including the rrc-ConfiguredUplinkGrant in Table 15, without receiving an UL grant in the DCI. After receiving configuredGrantConfig that does not include the rrc-ConfiguredUplinkGrantin in Table 25 by upper layer signaling, PUSCH transmissions of the configured grant type 2 can be semi-persistently scheduled by an UL grant in the DCI. If PUSCH transmission is operated with a configured grant, the parameters applied to the PUSCH transmission are applied by configuredGrantConfig (upper layer signaling) in Table 29, except for dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH, which are provided by pusch-Config (upper layer signaling) in Table 30. If transformPrecoder is set in configuredGrantConfig (upper layer signaling) in Table 29, the UE applies tp-pi2BPSK in pusch-Config in Table 30 to PUSCH transmissions operated by the configured grant.

[0286] [Table 29]

[0287] Next, the PUSCH transmission method will be described. The DMRS antenna port used for PUSCH transmission is the same as the antenna port used for SRS transmission. Depending on whether the value of txConfig within pusch-Config as upper layer signaling in Table 30 is "codebook" or "nonCodebook", PUSCH transmission can follow the codebook-based transmission method or the non-codebook-based transmission method.

[0288] As described above, PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, and can be semi-statically configured through a configured grant. Upon receiving an indication of scheduling of PUSCH transmission through DCI format 0_0, the UE can perform beam configuration for PUSCH transmission by using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the uplink BWP activated in the serving cell, and PUSCH transmission can be based on a single antenna port. The UE does not expect scheduling of PUSCH transmission through DCI format 0_0 within a BWP that does not have a configured PUCCH resource including pucch-spatialRelationInfo. If the UE does not configure txConfig within pusch-Config of Table 30, the UE does not expect scheduling through DCI format 0_1.

[0289] [Table 30]

[0290] The following describes codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1 and can be semi-statically configured via a configured grant. If codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the UE determines the precoder used for PUSCH transmission based on the SRS Resource Indicator (SRI), the Transmit Precoding Matrix Indicator (TPMI), and the transmission level (number of PUSCH transmission layers). The SRI can be provided via the SRS Resource Indicator (a field within the DCI) or configured via the srs-ResourceIndicator (higher layer signaling). During codebook-based PUSCH transmission, the UE must have configured at least one SRS resource and can configure up to two SRS resources. If the SRI is provided to the UE via DCI, the SRS resource indicated by the corresponding SRI is the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH containing the SRI. In addition, the TPMI and transmission level can be given through the "precoding information and number of layers" field within the DCI, or configured through precodingAndNumberOfLayers (upper layer signaling). The TPMI can be used to indicate the precoder to be applied to the PUSCH transmission. If one SRS resource is configured for the UE, the TPMI can be used to indicate the precoder to be applied to the configured SRS resource. If multiple SRS resources are configured for the UE, the TPMI is used to indicate the precoder to be applied to the SRS resource indicated by the SRI.

[0291] The precoder to be used for PUSCH transmission can be selected from an uplink codebook with the same number of antenna ports as the value of nrofSRS-Ports in SRS-Config (upper layer signaling). In conjunction with codebook-based PUSCH transmission, the UE can determine the codebook subset based on codebookSubset in pusch-Config (upper layer signaling) and the TPMI. codebookSubset in pusch-Config (upper layer signaling) can be configured as "fullAndPartialAndNonCoherent," "partialAndNonCoherent," or "nonCoherent" based on the UE capabilities reported by the UE to the base station. If the UE reports "partialAndNonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper layer signaling) to be configured as "fullAndPartialAndNonCoherent." In addition, if the UE reports "nonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper layer signaling) to be configured as "fullAndPartialAndNonCoherent" or "partialAndNonCoherent". If nrofSRS-Ports within the SRS-ResourceSet (upper layer signaling) indicates two SRS antenna ports, the UE does not expect the value of codebookSubset (upper layer signaling) to be configured as "partialAndNonCoherent".

[0292] The UE may be configured with one SRS resource set where the usage value in the SRS-ResourceSet (upper layer signaling) is "codebook", and an SRS resource may be indicated by the SRI in the corresponding SRS resource set. If multiple SRS resources are configured in the SRS resource set where the usage value in the SRS-ResourceSet (upper layer signaling) is "codebook", the UE expects the value of nrofSRS-Ports in the SRS-Resource (upper layer signaling) to be the same for all SRS resources.

[0293] The UE can transmit one or more SRS resources included in the SRS resource set in which the usage value is configured as "codebook" to the base station according to upper layer signaling, and the base station can select one of the SRS resources transmitted by the UE and indicate to the UE that it can transmit PUSCH by using the transmit beam information of the corresponding SRS resource. In combination with codebook-based PUSCH transmission, SRI can be used as information for selecting an index of an SRS resource and can be included in the DCI. Additionally, the base station can add information indicating the rank and TPMI to be used by the UE for PUSCH transmission to the DCI. Using the SRS resource indicated by SRI, the UE can apply the precoder indicated by the rank and TPMI indicated based on the transmit beam indication of the corresponding SRS resource when performing PUSCH transmission, thereby performing PUSCH transmission.

[0294] Next, we will describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled using DCI formats 0_0 or 0_1, and can be semi-statically operated using a configured grant. If at least one SRS resource is configured in an SRS resource set with a usage value of "nonCodebook" in the SRS-ResourceSet (upper layer signaling), non-codebook-based PUSCH transmission can be scheduled for the UE using DCI format 0_1.

[0295] Regarding the SRS resource set where the usage value in the SRS-ResourceSet (upper layer signaling) is "nonCodebook", a connected NZP CSI-RS resource (non-zero power CSI-RS) can be configured for the UE. The UE can calculate the precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the aperiodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the aperiodic SRS transmission in the UE is less than 42 symbols, the UE does not expect the information about the precoder used for SRS transmission to be updated.

[0296] If the configured value of resourceType within the SRS-ResourceSet (upper layer signaling) is "aperiodic," the attached NZP CSI-RS may be indicated by the SRS request, which is a field within DCI format 0_1 ​​or 1_1. If the attached NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the attached NZP CSI-RS is indicated by the value of the SRS request (a field within DCI format 0_1 ​​or 1_1) other than "00." The corresponding DCI should not indicate cross-carrier or cross-BWP scheduling. Furthermore, if the value of the SRS request indicates the presence of NZP CSI-RS, the NZP CSI-RS is located in the time slot used to transmit the PDCCH including the SRS request field. In this case, the TCI state configured for the scheduled subcarrier is not configured as QCL-Type D.

[0297] If a periodic or semi-persistent SRS resource set is configured, the connected NZP CSI-RS can be indicated by the associatedCSI-RS in the SRS-ResourceSet (upper layer signaling). For non-codebook based transmission, the UE does not expect that the spatialRelationInfo as the upper layer signaling about the SRS resource and the associatedCSI-RS in the SRS-ResourceSet (upper layer signaling) will be configured together.

[0298] If multiple SRS resources are configured for a UE, the UE can determine the precoder and transmit level to be applied to PUSCH transmission based on the SRI indicated by the base station. The SRI can be indicated by the SRS resource indicator (a field within the DCI) or configured via the srs-ResourceIndicator (upper layer signaling). Similar to the codebook-based PUSCH transmission described above, if the SRI is provided to the UE via DCI, the SRS resource indicated by the corresponding SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the corresponding SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be transmitted simultaneously in the same symbol within an SRS resource set and the maximum number of SRS resources are determined by the UE capabilities reported by the UE to the base station. The SRS resources transmitted simultaneously by the UE can occupy the same RB. The UE can be configured with one SRS port for each SRS resource. There can be only one configured SRS resource set, where the usage value within the SRS-ResourceSet (upper layer signaling) is "nonCodebook", and a maximum of four SRS resources can be configured for non-codebook based PUSCH transmission.

[0299] The base station transmits an NZP-CSI-RS connected to an SRS resource set to the UE, and the UE calculates the precoder to be used when transmitting one or more SRS resources in the corresponding SRS resource set based on the measurement result when receiving the corresponding NZP-CSI-RS. The UE applies the calculated precoder when transmitting one or more SRS resources in the SRS resource set to the base station, where the configured usage is nonCodebook, and the base station selects one or more SRS resources from the received one or more SRS resources. In combination with non-codebook based PUSCH transmission, the SRI can indicate an index that can represent one SRS resource or a combination of multiple SRS resources. The number of SRS resources indicated by the SRI transmitted by the base station can be the number of transmission layers of the PUSCH, and the UE can transmit the PUSCH by applying the precoder applied to the SRS resource transmission to each layer.

[0300] [PUSCH: Preparation process time]

[0301] Next, we'll describe the PUSCH preparation process time. If a base station schedules a UE to transmit a PUSCH using DCI formats 0_0, 0_1, or 0_2, the UE can request the PUSCH preparation process time to transmit the PUSCH by applying the transmission method (SRS resource transmission precoding method, number of transmission layers, spatial domain transmit filter) indicated by the DCI. With this in mind, the PUSCH preparation process time is defined in NR. The UE's PUSCH preparation process time can be calculated according to the equation given below.

[0302] [Equation 3]

[0303] T proc,2 = max(( N2+ d 2,1 + d2)( 2048 + 144 ) κ2 -μ T c + T ext + T switch , d 2,2 )

[0304] T described above in Equation 3 proc,2 Each parameter in can have the following meanings.

[0305] - N2: The number of symbols determined according to UE processing capability 1 or 2 based on the UE's capabilities and parameter set μ. If UE processing capability 1 is reported according to the UE's capability report, N2 may have the value in Table 31, and if UE processing capability 2 is reported and the availability of UE processing capability 2 is configured through upper layer signaling, it may have the value in Table 32.

[0306] [Table 31]

[0307] [Table 32]

[0308] -d 2,1 : If all resource elements of the first OFDM symbol of PUSCH transmission include DM-RS, the number of symbols is determined to be 0, otherwise it is determined to be 1.

[0309] -κ: 64

[0310] - μ: Follow and A value among them, so that T proc,2 Bigger. refers to a downlink parameter set for transmitting a PDCCH including DCI scheduling a PUSCH, and Refers to the uplink parameter set used to transmit PUSCH.

[0311] - T c :have .

[0312] -d 2,2 : If the DCI scheduling PUSCH indicates BWP switching, follow the BWP switching time, otherwise, have 0.

[0313] - d2: If OFDM symbols overlap in time between a PUSCH with a high priority index and a PUCCH with a low priority index, the d2 value of the PUSCH with the high priority index is used. Otherwise, d2 is 0.

[0314] - T ext : If the UE uses a shared spectrum channel access solution, the UE can calculate T ext And apply it to the PUSCH preparation process time. Otherwise, assume T ext is 0.

[0315] - T switch : If the uplink switching interval has been triggered, T switch Assume that is the switching interval time. Otherwise, assume that T switch is 0.

[0316] In view of the influence of the timing advance between uplink and downlink and the time domain resource mapping information of the PUSCH scheduled by DCI, if the first symbol of the PUSCH starts earlier than the first uplink symbol (where the CP is T from the last symbol of the PDCCH including the DCI scheduling the PUSCH), proc,2 If the PUSCH preparation process time is insufficient, the base station and the UE may determine that the PUSCH preparation process time is insufficient. Otherwise, the base station and the UE may determine that the PUSCH preparation process time is sufficient. The UE may transmit the PUSCH only if the PUSCH preparation process time is sufficient. If the PUSCH preparation process time is insufficient, the UE may ignore the DCI scheduling the PUSCH.

[0317] [PUSCH: About repeated transmission]

[0318] The following describes the repeated transmission of uplink data channels in 5G systems in detail. 5G systems support two types of uplink data channel repeated transmission methods: PUSCH repetition type A transmission and PUSCH repetition type B transmission. The UE can be configured to use either PUSCH repetition type A or PUSCH repetition type B transmission via upper layer signaling.

[0319] PUSCH repetition type A transmission

[0320] - As described above, the symbol length and the position of the starting symbol of the uplink data channel in one time slot can be determined by the time domain resource allocation method, and the base station can notify the UE of the number of repeated transmissions through upper layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0321] - Based on the number of repetition transmissions received from the base station, the UE may repeatedly transmit an uplink data channel having the same length and starting symbol as the configured uplink data channel in consecutive time slots. If the base station configures the time slot as downlink for the UE, or if at least one symbol of the uplink data channel configured for the UE is configured as downlink, the UE omits the uplink data channel transmission but counts the number of repetition transmissions of the uplink data channel.

[0322] PUSCH repetition type B transmission

[0323] - As described above, the symbol length and the position of the starting symbol of the uplink data channel in one time slot can be determined by the time domain resource allocation method, and the base station can notify the UE of the number of repetitions through upper layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI).

[0324] - Based on the previously configured starting symbol and length of the uplink data channel, the nominal repetition of the uplink data channel is determined as follows. The time slot in which the nth nominal repetition begins is determined by is given by , and the symbol starting in this time slot is given by given. The time slot in which the nth nominal repetition ends is given by is given by , and the symbol that ends in this time slot is given by given. In this regard, n=0, ..., numberofrepetitions-1, S refers to a starting symbol of a configured uplink data channel, and L refers to a symbol length of the configured uplink data channel. is the time slot where PUSCH transmission starts, and Refers to the number of symbols per time slot.

[0325] The UE determines invalid symbols for PUSCH repetition type B transmission. Symbols configured as downlink via tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated are determined to be invalid symbols for PUSCH repetition type B transmission. Additionally, invalid symbols may be configured in higher-layer parameters (e.g., InvalidSymbolPattern). The higher-layer parameters (e.g., InvalidSymbolPattern) may provide a symbol-level bitmap spanning one or two slots, thereby configuring invalid symbols. In the bitmap, a 1 indicates an invalid symbol. Additionally, the periodicity and pattern of the bitmap may be configured via higher-layer parameters (e.g., InvalidSymbolPattern). If the upper layer parameter (e.g., InvalidSymbolPattern) is configured, and if the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 indicates 1, the UE applies the invalid symbol pattern, and if the above parameter indicates 0, the UE does not apply the invalid symbol pattern. If the upper layer parameter (e.g., InvalidSymbolPattern) is configured, and if the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 is not configured, the UE applies the invalid symbol pattern.

[0326] After determining the invalid symbols, for each nominal repetition, the UE may treat the symbols other than the invalid symbols as valid symbols. If one or more valid symbols are included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Each actual repetition includes a group of consecutive valid symbols that can be used for PUSCH repetition transmission type B in a time slot. For reference, Figure 14 An example of PUSCH repetition type B transmission in a wireless communication system according to an embodiment of the present disclosure is shown.

[0327] [PUSCH: Frequency Hopping Process]

[0328] Hereinafter, frequency hopping of a physical uplink shared channel (PUSCH) in a 5G system will be described in detail.

[0329] For each PUSCH repetition transmission type, 5G can support two PUSCH frequency hopping methods. First, in PUSCH repetition transmission type A, intra-slot frequency hopping and inter-slot frequency hopping are supported, and in PUSCH repetition transmission type B, inter-repetition frequency hopping and inter-slot frequency hopping are supported.

[0330] The intra-slot frequency hopping method supported in PUSCH repetition type A transmission may include a method in which the UE transmits frequency-domain allocated resources in two hops in one slot after varying the configured frequency offset according to the configured frequency offset. The starting RB for each hop associated with intra-slot frequency hopping may be expressed by the following equation 4.

[0331] [Equation 4]

[0332] In Equation 4, i=0 and i=1 can represent the first hop and the second hop respectively, and RB start It can indicate the starting RB in the UL BWP and can be calculated according to the frequency resource allocation method. offset represents the frequency offset between two hops through upper layer parameters. The number of symbols in the first hop can be determined by , and the number of symbols in the second hop can be represented by express. is the length of PUSCH transmission in one slot and is represented by the number of OFDM symbols.

[0333] Next, the inter-slot frequency hopping method supported in PUSCH repetition type A and type B transmission is a method in which the UE transmits the allocated resources in the frequency domain in each slot after changing the allocated resources by the configured frequency offset. The starting RB during the slot related to inter-slot frequency hopping can be expressed by the following equation 5.

[0334] [Equation 5]

[0335] In Equation 5, Indicates the current slot number during multi-slot PUSCH transmission, and RB start Indicates the starting RB within the ULBWP and is calculated according to the frequency resource allocation method. offset Indicates the frequency offset between two hops via upper layer parameters.

[0336] Next, the inter-repetition frequency hopping method supported in PUSCH repetition type B transmission is a method of shifting the resources allocated in the frequency domain for one or more actual repetitions in each nominal repetition by a configured frequency offset and then transmitting. Index of the starting RB in the frequency domain for one or more actual repetitions in the nth nominal repetition RB start(n) It can be followed from Equation 6 given below.

[0337] [Equation 6]

[0338] In Equation 6, n represents the index of the nominal repetition, and RB offset The RB offset between two hops is represented by upper-layer parameters.

[0339] [PUSCH: Multiplexing rules during AP / SP CSI reporting]

[0340] Hereinafter, a method for measuring and reporting channel status in a 5G communication system will be described in detail. Channel state information (CSI) may include a channel quality indicator (CQI), a precoding matrix index (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), and reference signal received power (L1-RSRP). The base station may control the time and frequency resources used for the UE's CSI measurement and reporting.

[0341] For the aforementioned CSI measurement and reporting, the UE can be configured with N (N ≥ 1) CSI report configuration information (CSI-ReportConfig), M (M ≥ 1) RS transmission resource configuration information (CSI-ReportConfig), and one or two trigger state list information (CSI-AperiodicTriggerStateList, CSI-SemiPersistentOnPUSCH-TriggerStateList) via higher layer signaling. More specifically, the configuration information for the aforementioned CSI measurement and reporting can be described in Tables 33 to 39 below.

[0342] [Table 33]

[0343] The IE CSI-ReportConfig is used to configure periodic or semi-persistent reporting including CSI-ReportConfig sent on the PUCCH on a cell, or to configure semi-persistent or aperiodic reporting including CSI-ReportConfig sent on the PUSCH triggered by DCI received on a cell (in this case, the cell sending the report is determined by the received DCI). See TS 38.214

[19] , clause 5.2.1.

[0344]

[0345] [Table 34]

[0346] The IE CSI-ResourceConfig defines a group of one or more NZP-CSI-RS-ResourceSets, CSI-IM-ResourceSets and / or CSI-SSB-ResourceSets.

[0347]

[0348] [Table 35]

[0349] The IE NZP-CSI-RS-ResourceSet is the set of non-zero power (NZP) CSI-RS resources (their IDs) and set specific parameters.

[0350]

[0351] [Table 36]

[0352] The IE CSI-SSB-ResourceSet is used to configure a SS / PBCH block resource set that references the SS / PBCH as indicated in ServingCellConfigCommon.

[0353]

[0354] [Table 37]

[0355] The IE CSI-IM-ResourceSet is used to configure a set of one or more CSI interference management (IM) resources (their IDs) and set-specific parameters.

[0356]

[0357] [Table 38]

[0358] The CSI-AperiodicTriggerStateList IE is used to configure the aperiodic trigger state list for the UE. Each codepoint in the DCI field "CSI Request" is associated with a trigger state. After receiving the value associated with a trigger state, the UE will measure the CSI-RS (reference signal) according to all entries in the associatedReportConfigInfoList of the trigger state and report it aperiodically on L1.

[0359]

[0360] [Table 39]

[0361] The CSI-SemiPersistentOnPUSCH-TriggerStateList IE is used to configure the trigger state list for the UE to semi-persistently report channel state information on L1. See also TS 38.214

[19] , clause 5.2.

[0362]

[0363] Regarding the aforementioned CSI reporting configuration (CSI-ReportConfig), each reporting configuration CSI-ReportConfig can be associated with a downlink (DL) bandwidth part identified by the higher-layer parameter bandwidth part identifier (bwp-id) given by the CSI resource configuration CSI-ResourceConfig associated with the corresponding reporting configuration. As time-domain reporting for each reporting configuration CSI-ReportConfig, "aperiodic," "semi-persistent," and "periodic" schemes can be supported, and these schemes can be configured for the UE by the base station via the reportConfigType parameter configured from higher layers. The semi-persistent CSI reporting method can support the "semi-persistent on PUCCH" method and the "semi-persistent on PUSCH" method. In the case of periodic or semi-persistent CSI reporting methods, the PUCCH or PUSCH resources in which the CSI is to be transmitted can be configured for the UE by the base station via higher-layer signaling. The periodicity and slot offset of the PUCCH or PUSCH resources in which CSI will be transmitted can be specified by the parameter set of the uplink (UL) bandwidth part configured for CSI report transmission. In the case of the aperiodic CSI reporting method, the PUSCH resources in which CSI will be transmitted can be scheduled for the UE by the base station via L1 signaling (the aforementioned DCI format 0_1). Regarding the aforementioned CSI resource configuration (CSI-ResourceConfig), each CSI resource configuration CSI-ReportConfig can include S (≥1) CSI resource sets (for example, specified via the higher-layer parameter csi-RS-ResourceSetList). The CSI resource set list can include non-zero power (NZP) CSI-RS resource sets and SS / PBCH block sets, or can include CSI interference measurement (CSI-IM) resource sets. Each CSI resource set can be located in a downlink (DL) bandwidth part identified by the higher-layer parameter bwp-id and can be connected to a CSI report configuration in the same downlink bandwidth part. The time domain operation of the CSI-RS resources in the CSI resource setting can be configured from the higher-layer parameter resourceType as one of "aperiodic," "periodic," or "semi-persistent." For periodic or semi-persistent CSI resource settings, the number of CSI-RS resource sets can be limited to S (S=1), and the configured periodicity and slot offset can be given based on the parameter set of the downlink bandwidth part identified by bwp-id. One or more CSI resource settings for channel or interference measurement can be configured for the UE by the base station via higher-layer signaling, and the one or more CSI resource settings can include, for example, the following CSI resources:

[0364] - CSI-IM resources for interference measurements

[0365] - NZP CSI-RS resources for interference measurement

[0366] - NZP CSI-RS resources for channel measurement

[0367] With respect to a CSI-RS resource set associated with a resource setting in which the higher-layer parameter resourceType is configured as "aperiodic", "periodic", or "semi-persistent", the trigger state of the CSI report setting with reportType configured as "aperiodic" and the resource setting for channel or interference measurement on one or more component cells (CCs) can be configured via the higher-layer parameter CSI-AperiodicTriggerStateList.

[0368] Aperiodic CSI reporting by the UE can be performed using the PUSCH, periodic CSI reporting can be performed using the PUCCH, and semi-persistent CSI reporting can be performed using the PUSCH when triggered or activated via the DCI, and can be performed using the PUCCH after activation via the MAC Control Element (MAC CE). As described above, the CSI resource setting can also be configured as aperiodic, periodic, or semi-persistent. Combinations of CSI report settings and CSI resource configurations can be supported based on the following Table 40.

[0369] [Table 40]

[0370] Aperiodic CSI reporting can be triggered by the "CSI request" field of the above-mentioned DCI format 0_1 ​​corresponding to the scheduling DCI for PUSCH. The UE can monitor the PDCCH, obtain DCI format 0_1, and obtain scheduling information and a CSI request indicator for the PUSCH. The CSI request indicator can be configured with NTS (= 0, 1, 2, 3, 4, 5, or 6) bits and can be determined by higher-layer signaling (reportTriggerSize). Among one or more aperiodic CSI report triggering states that can be configured via higher-layer signaling (CSI-AperiodicTriggerStateList), one triggering state can be triggered by the CSI request indicator.

[0371] - If all bits in the CSI request field are 0, this may indicate that no CSI report is requested.

[0372] - If the number M of CSI triggering states configured in CSI-AperiodicTriggerStateLite is greater than 2NTs-1, the M CSI triggering states can be mapped to 2NTs-1 triggering states according to a predefined mapping relationship, and one of the 2NTs-1 triggering states can be indicated by the CSI request field.

[0373] If the number M of configured CSI triggering states in CSI-AperiodicTriggerStateLite is less than or equal to 2NTs-1, one of the M CSI triggering states may be indicated by the CSI request field.

[0374] Table 41 below shows an example of a relationship between a CSI request indicator and a CSI triggering state that can be indicated by a corresponding indicator.

[0375] [Table 41]

[0376] The UE can measure CSI resources in a CSI triggering state triggered by the CSI request field and then generate CSI (including, for example, at least one of the aforementioned CQI, PMI, CRI, SSBRI, LI, RI, or L1-RSRP) based on the measurement. The UE can transmit the acquired CSI using the PUSCH scheduled via the corresponding DCI format 0_1. If a bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​indicates "1," the UE can multiplex uplink data (UL-SCH) and the acquired CSI on the PUSCH resources scheduled by DCI format 0_1 ​​for transmission. If a bit corresponding to the uplink data indicator (UL-SCH indicator) in DCI format 0_1 ​​indicates "0," the UE can multiplex only the CSI, without the uplink data (UL-SCH), onto the PUSCH resources scheduled by DCI format 0_1 ​​for transmission.

[0377] Figure 12 An example of a method in which a UE selects a receivable control resource set in consideration of priority after receiving a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 12 In [PDCCH QCL prioritization rules], details related to the aforementioned [PDCCH QCL prioritization rules] will be described.

[0378] refer to Figure 12, a UE may be configured to receive multiple control resource sets that overlap in time during a specific PDCCH monitoring opportunity 1210, and these multiple control resource sets may be connected to a common search space or a UE-specific search space for multiple cells. In the corresponding PDCCH monitoring opportunity, control resource set 1 1200 connected to common search space 1 may be present in bandwidth part 1 1215 of cell 1, and control resource set 1 1205 connected to common search space 1 and control resource set 2 1220 connected to UE-specific search space 2 may be present in bandwidth part 1 1225 of cell 2. Control resource sets 1215 and 1220 may have a QCL-Type D relationship with CSI-RS resource 1 configured in bandwidth part 1 of cell 1, and control resource set 1225 may have a QCL-Type D relationship with CSI-RS resource 1 configured in bandwidth part 1 of cell 2. If criterion 1 is applied to the corresponding PDCCH monitoring opportunity 1210, all other control resource sets having the same QCL-Type D reference signal as control resource set 1 1215 may be received. Therefore, the UE may receive control resource sets 1210 and 1215 in the corresponding PDCCH monitoring opportunity 1220. As another example, the UE may be configured to receive multiple control resource sets that overlap in time in a specific PDCCH monitoring opportunity 1240, and these multiple control resource sets may be connected to a common search space or a UE-specific search space for multiple cells. In the corresponding PDCCH monitoring opportunity, control resource set 1 1230 connected to UE-specific search space 1 and control resource set 2 1245 connected to UE-specific search space 2 may be present in bandwidth part 1 1250 of cell 1, and control resource set 1 1235 connected to UE-specific search space 1 and control resource set 2 1255 connected to UE-specific search space 3 may be present in bandwidth part 1 1260 of cell 2. Control resource sets 1245 and 1250 may have a QCL-Type D relationship with CSI-RS resource 1 configured in bandwidth part 1 of cell 1, control resource set 1255 may have a QCL-Type D relationship with CSI-RS resource 1 configured in bandwidth part 1 of cell 2, and control resource set 1260 may have a QCL-Type D relationship with CSI-RS resource 2 configured in bandwidth part 1 of cell 2. If criterion 1 is applied to the corresponding PDCCH monitoring opportunity 1240, there is no common search space, and thus the next criterion, i.e., criterion 2, may be applied. If criterion 2 is applied to the corresponding PDCCH monitoring opportunity 1240, all other control resource sets having the same QCL-Type D reference signal as control resource set 1 1245 may be received. Therefore, the UE may receive control resource sets 1240 and 1245 in the corresponding PDCCH monitoring opportunity 1250.

[0379] Figure 13 An example of an aperiodic CSI reporting method according to an embodiment of the present disclosure is shown.

[0380] exist Figure 13 In example 1300, the UE can obtain DCI format 0_1 ​​by monitoring PDCCH 1301 and obtain scheduling information and CSI request information for PUSCH 1305 from it. The UE can obtain resource information for CSI-RS 1302 to be measured from the received CSI request indicator. The UE can determine the time point at which the UE needs to measure the resources of CSI-RS 1302 based on the time point at which DCI format 0_1 ​​is received and the offset parameter (e.g., the aforementioned aperiodicTriggeringOffset) in the CSI resource set configuration (e.g., the NZP CSI-RS resource set configuration (NZP-CSI-RS-ResourceSet)). More specifically, the base station can configure the UE with an offset value X for the parameter aperiodicTriggeringOffset in the NZP-CSI-RS resource set configuration via higher-layer signaling. The configured offset value X may refer to the offset between the time slot in which the DCI triggering the aperiodic CSI report is received and the time slot in which the CSI-RS resources are transmitted. For example, the aperiodicTriggeringOffset parameter value and the offset value X may have a mapping relationship as shown in Table 42 below.

[0381] [Table 42]

[0382] Figure 13 Example 1300 shows an example in which the aforementioned offset value X is configured as 0 (X=0). In this case, the UE may receive the time slot of the DCI format 0_1 ​​that triggers the aperiodic CSI report (the same as Figure 13 1306 in the DCI format 0_1) and can report CSI information measured based on the received CSI-RS to the base station via the PUSCH 1305. The UE can obtain scheduling information on the PUSCH 1305 for CSI reporting from the DCI format 0_1 ​​(information corresponding to each field of the above-mentioned DCI format 0_1). For example, in the DCI format 0_1, the UE can obtain information about the time slot in which the PUSCH 1305 is to be transmitted from the time domain resource allocation information of the above-mentioned PUSCH 1305. Figure 13In the first example 1300, the UE obtains 3 as the K2 value corresponding to the PDCCH-to-PUSCH slot offset value, and therefore, can transmit PUSCH 1305 in slot 3 1309 (i.e., the time point at which PDCCH 1301 has been received) spaced 3 slots apart from slot 0 1306. Figure 13 In the second example 1310, the UE may obtain DCI format 0_1 ​​by monitoring PDCCH 1311, and may obtain therefrom scheduling information and CSI request information for PUSCH 1315. The UE may obtain resource information of the CSI-RS 1312 to be measured from the received CSI request indicator. Figure 13 The second example 1310 shows an example in which the offset value X of the above CSI-RS is configured as 1 (X=1). In this case, the UE can receive the time slot of the DCI format 0_1 ​​that triggers the aperiodic CSI report (the same as Figure 13 The CSI-RS 1312 is received in the time slot 0 1316 in the time slot 1316, and the CSI information measured based on the received CSI-RS can be reported to the base station via the PUSCH 1315.

[0383] An aperiodic CSI report may include at least one or both of CSI Part 1 and CSI Part 2, and when the aperiodic CSI report is transmitted via the PUSCH, the aperiodic CSI report may be multiplexed on a transport block. After inserting a CRC into the input bits of the aperiodic CSI for multiplexing, coding and rate matching may be performed, and then transmission may be performed by mapping to resource elements within the PUSCH in a specific pattern. Depending on the coding method or the length of the input bits, CRC insertion may be omitted. The number of modulation symbols calculated for rate matching during multiplexing of CSI Part 1 or CSI Part 2 included in the aperiodic CSI report may be calculated as shown in Table 43.

[0384] [Table 43]

[0385] Specifically, for repeated PUSCH transmission schemes A and B, the UE may multiplex the aperiodic CSI report only on the first repetition in the PUSCH repetition transmission for transmission. This is because the aperiodic CSI report information to be multiplexed is encoded in a polar code scheme, and at this time, each PUSCH repetition needs to have the same frequency and time resource allocation in order to multiplex the aperiodic CSI report information on multiple PUSCH repetitions. In particular, in the case of PUSCH repetition type B transmission, since each actual repetition may have a different OFDM symbol duration, the aperiodic CSI report may be multiplexed only on the first repetition and then transmitted. In addition, for repeated PUSCH transmission scheme B, when the UE receives a DCI for activating semi-persistent CSI reporting or scheduling aperiodic CSI reporting without scheduling a transport block, the UE may assume a nominal repetition value of 1 even if the number of repeated PUSCH transmissions configured via higher layer signaling is greater than 1. In addition, when repetition-based PUSCH transmission scheme B schedules or activates aperiodic or semi-persistent CSI reporting without scheduling a transport block, the UE may expect the first nominal repetition to be the same as the first actual repetition. With respect to the PUSCH transmitted when semi-persistent CSI is included, repetition-based PUSCH transmission scheme B, when no DCI is scheduled after semi-persistent CSI reporting has been activated via DCI, if the first nominal repetition is different from the first actual repetition, the transmission of the first nominal repetition may be ignored.

[0386] [About UE Capability Report]

[0387] In LTE and NR, a UE may perform the following procedure: When connected to a serving base station, the UE may report the capabilities supported by the UE to the corresponding base station. In the following description, the above procedure will be referred to as UE capability reporting.

[0388] A base station can transmit a UE Capability Query message to a connected UE to request a capability report. This message may include UE capability requests for each radio access technology (RAT) type associated with the base station. RAT-type-specific requests may include information such as supported frequency band combinations. Furthermore, in the case of a UE Capability Query message, a single RRC message container can be used by the base station to request UE capabilities for multiple RAT types, or the base station can transmit a UE Capability Query message that includes multiple UE capability requests for corresponding RAT types. This capability query can be repeated multiple times in a single message, and the UE can configure corresponding UE capability information messages and report multiple times. In next-generation mobile communication systems, UE capability requests for Multi-RAT Dual Connectivity (MR-DC) such as NR, LTE, and E-UTRA-NR Dual Connectivity (EN-DC) can be made. The UE Capability Query message is typically transmitted after the UE connects to the base station, but can also be requested by the base station in any other situation if necessary.

[0389] After receiving the UE capability report request from the base station in the previous step, the UE can configure the UE capabilities based on the frequency band information and the RAT type requested by the base station. The following summarizes the method for the UE to configure the UE capabilities in the NR system. However, the present disclosure is not limited to this.

[0390] 1. If the UE receives a list of LTE and / or NR frequency bands from the base station upon UE capability request, the UE constructs a frequency band combination for EN-DC and NR Standalone (SA). That is, based on the frequency bands received from the base station via the FreqBandList upon request, the UE configures a candidate list of BCs for EN-DC and NR SA. In addition, the frequency bands may have priorities in the order described in the FreqBandList.

[0391] 2. If the base station sets the "eutra-nr-only" flag or the "eutra" flag and requests UE capability reporting, the UE removes all content related to NR SA BC from the configured BC candidate list. This operation is only possible if the LTE base station (eNB) requests the "eutra" capability.

[0392] 3. The UE then removes the fallback BC from the candidate BC list configured in the previous steps. As used herein, a fallback BC refers to a BC that can be obtained by removing the frequency band corresponding to at least one SCell from a specific BC. Since the fallback BC is already covered by the BC before removing the frequency band corresponding to at least one SCell, it can be omitted. This step also applies to MR-DC, that is, LTE frequency bands. The BCs remaining after the above steps constitute the final "candidate BC list."

[0393] 4. The UE selects a BC suitable for the requested RAT type from the final "candidate BC list" and configures the BC to be reported. In this step, the UE configures the supportedBandCombinationList in a predetermined order. That is, the UE configures the BC to be reported and the UE capabilities according to the pre-configured rat-type order (NR → eutra-NR → eutra). Furthermore, the UE configures the featureSetCombination based on the configured supportedBandCombinationList and configures a list of "candidate feature set combinations" based on the candidate BC list, excluding the list for fallback BCs (including equal or lower-level capabilities). "Candidate feature set combinations" can include all feature set combinations for NR and EUTRA-NR BCs and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0394] 5. If the requested RAT type is eutra-nr and it affects, featureSetCombinations is included in both UE-MRDC-Capabilities and UE-NR-Capabilities containers. However, NR feature sets are only included in UE-NR-Capabilities.

[0395] After configuring the UE capabilities, the UE may transmit a UE capability information message including the UE capabilities to the base station. The base station may perform scheduling and transmission / reception management appropriate for the UE based on the UE capabilities received from the UE.

[0396] Figure 14 An example of PUSCH repetition type B transmission in a wireless communication system according to an embodiment of the present disclosure is shown. The UE may receive the following configuration: the start symbol S of the uplink data channel is 0, the length L of the uplink data channel is 14, and the number of repetition transmissions is 16. In this case, nominal repetition 1405 may occur in 16 consecutive time slots. Thereafter, the UE may determine that the symbols configured as downlink symbols in each nominal repetition 1405 are invalid symbols. The UE may determine that the symbols configured as 1 in the invalid symbol pattern 1410 are invalid symbols. If valid symbols other than the invalid symbols in the corresponding nominal repetition constitute one or more consecutive symbols in one time slot, they are configured as actual repetitions (1415) and transmitted.

[0397] In addition, regarding PUSCH repetition transmission, additional methods for UL grant-based PUSCH transmission across slot boundaries and configuration grant-based PUSCH transmission may be defined in NR Release 16 as follows: Method 1 (mini-slot repetition): Two or more PUSCH repetitions are scheduled within a slot or across the boundaries of consecutive slots using a single UL grant. For Method 1, the time-domain resource allocation information within the DCI indicates the resources for the first repetition. Additionally, the time-domain resource information for the remaining repetitions is determined based on the time-domain resource information for the first repetition and the uplink or downlink direction determined for each symbol in each slot. Each repetition occupies consecutive symbols.

[0398] - Method 2 (Multi-segment Transmission): Two or more PUSCH repetition transmissions are scheduled in consecutive time slots using one UL grant. Transmission number 1 is assigned to each time slot, and the starting point or repetition length varies between corresponding transmissions. In Method 2, the time domain resource allocation information within the DCI indicates the starting point and repetition length of all repetition transmissions. In the case of performing repetition transmission within a single time slot using Method 2, if multiple bundles of consecutive uplink symbols exist in the corresponding time slot, the corresponding repetition transmission can be performed with respect to the corresponding uplink symbol bundle. If a single bundle of consecutive uplink symbols exists in the corresponding time slot, PUSCH repetition transmission is performed according to the NR Release 15 method.

[0399] - Method 3: Two or more PUSCH repetitive transmissions are scheduled in consecutive time slots using two or more UL grants. Transmission number 1 may be specified for each time slot, and the nth UL grant may be received before the PUSCH transmission scheduled by the (n-1)th UL grant ends.

[0400] - Method 4: One or more PUSCH repetition transmissions within a single time slot, or two or more PUSCH repetition transmissions across the boundaries of consecutive time slots, can be supported by one UL grant or one configured grant. The number of repetitions indicated by the base station to the UE is only a nominal value, and the UE can actually perform more PUSCH repetition transmissions than the nominal number of repetitions. The time domain resource allocation information within the DCI or the configured grant refers to the resources of the first repetition transmission indicated by the base station. The time domain resource information of the remaining repetition transmissions can be determined with reference to the resource information of the first repetition transmission and the uplink or downlink direction of the symbol. If the time domain resource information of the repetition transmission indicated by the base station crosses the time slot boundary or includes an uplink / downlink switching point, the corresponding repetition transmission can be divided into multiple repetition transmissions. With respect to each uplink cycle, one repetition transmission can be included in one time slot.

[0401] [About CA / DC]

[0402] Figure 15 A radio protocol structure of a base station and a UE in single cell, carrier aggregation, and dual connectivity scenarios in a wireless communication system according to an embodiment of the present disclosure is shown.

[0403] refer to Figure 15 The radio protocols of the mobile communication system include NR Service Data Adaptation Protocol (SDAP) S25 or S70, NR Packet Data Convergence Protocol (PDCP) S30 or S65, NR Radio Link Control (RLC) S35 or S60, and NR Medium Access Control (MAC) S40 or S55 on each of the UE and NR base station sides.

[0404] The main functions of NR SDAP S25 or S70 may include some of the following functions.

[0405] - Transmission of user plane data

[0406] - Mapping between QoS flows and DRBs for both DL and UL

[0407] - Marking QoS Flow ID in both DL and UL packets

[0408] - Reflective QoS flow to DRB mapping for UL SDAP PDU

[0409] Regarding the SDAP layer device, the UE can configure whether to use the header of the SDAP layer device or whether to use the SDAP layer function for each PDCP layer device or each bearer or each logical channel through an RRC message, and if the SDAP header is configured, the non-access stratum (NAS) QoS reflection configuration 1-bit indicator (NAS reflective QoS) and AS QoS reflection configuration 1-bit indicator (AS reflective QoS) of the SDAP header can be indicated, so that the UE can update or reconfigure the mapping information of the QoS flow and data bearer for the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority information, scheduling information, etc. to smoothly support services.

[0410] The main functions of NR PDCP S30 or S65 may include some of the following functions.

[0411] - Header compression and decompression: ROHC only

[0412] - Transmission of user data

[0413] - Sequential delivery of upper layer PDUs

[0414] - Out-of-order delivery of upper layer PDUs

[0415] - PDCP PDU reordering for reception

[0416] - Duplicate detection of lower layer SDUs

[0417] - Retransmission of PDCP SDU

[0418] - Encryption and decryption

[0419] - Timer-based SDU discard in uplink

[0420] Reordering of NR PDCP devices refers to the function of reordering PDCP PDUs received from lower layers in an order based on the PDCP sequence number (SN), and may include the function of delivering data to upper layers in the reordered sequence. Alternatively, reordering of NR PDCP devices may include the function of delivering data immediately without regard to the order, the function of recording PDCP PDUs lost as a result of reordering, the function of reporting the status of lost PDCP PDUs to the transmitting side, and the function of requesting retransmission of lost PDCP PDUs.

[0421] The main functions of NR RLC S35 or S60 may include some of the following functions.

[0422] - Transmission of upper layer PDU

[0423] - Sequential delivery of upper layer PDUs

[0424] - Out-of-order delivery of upper layer PDUs

[0425] - Error correction via ARQ

[0426] - Concatenation, segmentation and reordering of RLC SDUs

[0427] - Re-segmentation of RLC data PDUs

[0428] - Reordering of RLC data PDUs

[0429] - Duplicate detection

[0430] - Protocol error detection

[0431] - RLC SDU discarded

[0432] - RLC reconstruction

[0433] In-sequence delivery of the NR RLC device may refer to a function of sequentially delivering RLC SDUs received from a lower layer to an upper layer. The in-sequence delivery of the NR RLC device may include at least one of the following: if one original RLC SDU is segmented into a plurality of RLC SDUs and the segmented RLC SDUs are received, a function of reordering the RLC SDUs and delivering the reordered RLC SDUs; a function of reordering the received RLC SDUs with reference to the RLC sequence number (SN) or the PDCP sequence number (SN); a function of recording RLC PDUs lost as a result of the reordering; a function of reporting the status of the lost RLC PDUs to the transmitting side; and a function of requesting retransmission of the lost RLC PDUs. The in-sequence delivery of the NR RLC device may include a function of sequentially delivering only the RLC SDUs preceding the lost RLC SDU to the upper layer if there is a lost RLC SDU, and may include a function of sequentially delivering all RLC SDUs received before the timer starts to the upper layer despite the presence of the lost RLC SDU if a predetermined timer expires. Alternatively, the in-sequence delivery of the NR RLC device may include a function of sequentially delivering all RLC SDUs received up to that point to the upper layer if a predetermined timer has expired, despite the presence of lost RLC SDUs. Furthermore, the in-sequence delivery of the NR RLC device may include a function of processing RLC PDUs in the order of reception (in the order of arrival regardless of the sequence number order) and delivering them to the PDCP device regardless of the order (out-of-sequence delivery), and may include a function of receiving, in the case of segmentation, segments stored in a buffer or to be received later, reconfiguring them into a complete RLC PDU, processing them, and delivering them to the PDCP device. The NR RLC layer may not include a concatenation function that may be performed in the NR MAC layer or replaced by a multiplexing function of the NR MAC layer.

[0434] The out-of-order delivery function of the NR RLC device refers to a function of immediately delivering the RLC SDU received from the lower layer to the upper layer regardless of the order, and may include the following functions: if one original RLC SDU is divided into several RLC SDUs and then these RLC SDUs are received, the several RLC SDUs are reassembled and the reassembled RLC SDUs are transmitted. The out-of-order delivery function of the NR RLC device may include a function of storing the RLC SN or PDCP SN of the received RLC PDU and arranging the order to record the lost RLC PDU.

[0435] NR MAC S40 or S55 can be connected to multiple NR RLC layer devices configured in one UE, and the main functions of NR MAC may include some of the following functions.

[0436] - Mapping between logical channels and transport channels

[0437] - Multiplexing / demultiplexing of MAC SDU

[0438] - Dispatch information report

[0439] - Error correction via HARQ

[0440] - Priority handling between logical channels of a UE

[0441] - Priority handling between UEs with the help of dynamic scheduling

[0442] - MBMS service identifier

[0443] - Transmission format selection

[0444] - Filling

[0445] The NR PHY layer S45 or S50 may perform the following operations: channel-encode and modulate the upper layer data to obtain OFDM symbols and deliver the OFDM symbols through the radio channel; or demodulate the OFDM symbols received through the radio channel, channel-decode them, and deliver them to the upper layer.

[0446] The detailed structure of the radio protocol structure may vary depending on the carrier (or cell) operation scheme. As an example, in the case where the base station transmits data to the UE based on a single carrier (or cell), the base station and the UE may use a protocol structure having a single structure for each layer, such as S00. On the other hand, in the case where the base station transmits data to the UE based on carrier aggregation (CA) using multiple carriers in a single TRP, the base station and the UE may use a protocol structure having a single structure up to RLC, but multiplex the PHY layer through the MAC layer, such as S10. As another example, in the case where the base station transmits data to the UE based on dual connectivity (DC) using multiple carriers in multiple TRPs, the base station and the UE may use a protocol structure having a single structure up to RLC, but multiplex the PHY layer through the MAC layer, such as S20.

[0447] With reference to the above description regarding PDCCH and beam configuration, current Rel-15 and Rel-16 NR systems do not support PDCCH retransmission, and therefore, achieving the required reliability in scenarios requiring high reliability, such as URLLC, can be difficult. The present disclosure can improve the UE's PDCCH reception reliability by providing a PDCCH retransmission method via multiple transmission points (TRPs). The specific method will be described below through the following embodiments.

[0448] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The content of the present disclosure can be applied to FDD and TDD systems. As used herein, upper layer signaling (or upper layer signaling) is a method for transmitting a signal from a base station to a UE using a downlink data channel of the physical layer or from a UE to a base station using an uplink data channel of the physical layer, and may be referred to as "RRC signaling," "PDCP signaling," or "Media Access Control (MAC) Control Element (MAC CE)."

[0449] In the following, in the present disclosure, the UE may use various methods to determine whether cooperative communication is applied, for example, the PDCCH to which the PDSCH to which cooperative communication is applied is allocated has a specific format, or the PDCCH to which the PDSCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is applied, or the PDCCH to which the PDSCH to which cooperative communication is applied is allocated is scrambled by a specific RNTI, or it is assumed that the application of cooperative communication is within a specific range indicated by an upper layer. Hereinafter, for convenience of description, it will be assumed that the NC-JT case refers to a case in which the UE receives the PDSCH to which cooperative communication is applied based on conditions similar to the above conditions.

[0450] Hereinafter, determining the priority between A and B may be variously described as, for example, selecting an entity with a higher priority and performing an operation corresponding thereto according to a predetermined priority rule, or omitting or discarding an operation on an entity with a lower priority.

[0451] Hereinafter, the above examples may be described through several embodiments, but these embodiments are not independent of each other, and one or more embodiments may be applied simultaneously or in combination.

[0452] [About NC-JT]

[0453] According to an embodiment of the present disclosure, non-coherent joint transmission (NC-JT) may be used for a UE to receive PDSCH from multiple TRPs.

[0454] Unlike conventional systems, 5G wireless communication systems can support all services with extremely short transmission delays, services requiring high connection density, and services requiring high transmission rates. In a wireless communication network including multiple cells, transmission and reception points (TRPs), or beams, cooperative communication (coordinated transmission) between corresponding cells, TRPs, and / or beams can meet various service requirements by enhancing the strength of signals received by UEs or efficiently performing interference control between corresponding cells, TRPs, and / or beams.

[0455] Joint transmission (JT) is a representative transmission technology for the above-mentioned cooperative communication, and is a scheme for increasing the strength or throughput of the signal received by a UE by transmitting the signal to one UE via multiple different cells, TRPs and / or beams. Here, the channels between the corresponding cells, TRPs or / and beams and the UE may have different characteristics, and in particular, non-coherent joint transmission (NC-JT) supporting non-coherent precoding between the corresponding cells, TRPs and / or beams may require separate precoding, MCS, resource allocation and TCI indication according to the channel characteristics of each link between the corresponding cells, TRPs and / or beams and the UE.

[0456] The aforementioned NC-JT transmission can be applied to at least one of the downlink data channel (Physical Downlink Shared Channel (PDSCH)), the downlink control channel (Physical Downlink Control Channel (PDCCH)), the uplink data channel (Physical Uplink Shared Channel (PUSCH)), and the uplink control channel (Physical Uplink Control Channel (PUCCH)). During PDSCH transmission, transmission information such as precoding, MCS, resource allocation, and TCI can be indicated via DL DCI. For NC-JT, this transmission information should be indicated independently for each cell, TRP, and / or beam. This significantly increases the payload required for DL ​​DCI transmission, which can negatively impact the reception performance of the PDCCH used for DCI. Therefore, to support JT of PDSCH, it is necessary to carefully design the trade-off between the amount of DCI information and the reception performance of control information.

[0457] Figure 16 An example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown. Specifically, Figure 16 An example of antenna port configuration and resource allocation for transmitting a PDSCH using cooperative communication in a wireless communication system is shown.

[0458] refer to Figure 16 , describes an example of PDSCH transmission for each joint transmission (JT) scheme, and shows an example of radio resource allocation for each TRP.

[0459] refer to Figure 16 , showing example N000 of coherent joint transmission (C-JT) supporting interfering coding between corresponding cells, TRPs or / and beams.

[0460] With C-JT, TRP A N005 and TRP B N010 transmit a single piece of data (PDSCH) to UE N015, and joint precoding can be performed across multiple TRPs. This can indicate that DMRS is transmitted over the same DMRS port, so that TRP A N005 and TRP B N010 transmit the same PDSCH. For example, TRP A N005 and TRP B N010 can transmit DMRS to the UE over DMRS ports A and DMRS B, respectively. In this case, the UE can receive a single piece of DCI information for receiving a single PDSCH modulated based on the DMRS transmitted over DMRS ports A and B.

[0461] Figure 16 Example N020 is shown of non-coherent joint transmission (NC-JT) supporting non-coherent intercoding between corresponding cells, TRPs and / or beams for PDSCH transmission.

[0462] For NC-JT, PDSCH is transmitted to UE N035 for each cell, TRP, and / or beam, and separate precoding may be applied to each PDSCH. The corresponding cell, TRP, and / or beam may transmit different PDSCHs or different PDSCH layers to the UE, thereby improving throughput compared to a single cell, TRP, and / or beam transmission. In addition, the corresponding cell, TRP, and / or beam may repeatedly transmit the same PDSCH to the UE, thereby improving reliability compared to a single cell, TRP, and / or beam transmission. For ease of explanation, cells, TRPs, and / or beams may be collectively referred to as TRPs.

[0463] In this case, various radio resource allocations can be considered, such as the case N040 where the frequency and time resources used in multiple TRPs for PDSCH transmission are the same, the case N045 where the frequency and time resources used in multiple TRPs do not overlap at all, and the case N050 where some frequency and time resources used in multiple TRPs overlap.

[0464] To support NC-JT, DCIs of various types, structures, and relationships can be considered to simultaneously allocate multiple PDSCHs to a single UE.

[0465] Figure 17An example of downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown; specifically, Figure 17 An example of DCI configuration of NC-JT in which corresponding TRPs transmit different PDSCHs or different PDSCH layers to UEs in a wireless communication system is shown.

[0466] refer to Figure 17 Case #1 N100 is an example of transmitting N-1 different PDSCHs from N-1 additional TRPs (TRP#1 to TRP#N-1) in addition to the serving TRP (TRP#0) used during a single PDSCH transmission. Control information for the PDSCHs transmitted in the additional N-1 TRPs is transmitted independently of the control information for the PDSCHs transmitted in the serving TRP. That is, the UE can obtain control information for PDSCHs transmitted from different TRPs (TRP#0 to TRP#(N-1)) through multiple independent DCIs (DCI #0 to DCI #(N-1)). The formats of the multiple independent DCIs may be the same or different, and the payloads of the multiple DCIs may also be the same or different. In Case #1 above, the degree of freedom in PDSCH control or allocation is fully guaranteed, but when the corresponding multiple DCIs are transmitted by different TRPs, differences in DCI coverage may occur, and reception performance may be degraded.

[0467] Case #2 N105 is an example of the following: in a situation where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (from TRP #1 to TRP #(N-1)) in addition to the serving TRP (TRP #0) used for a single PDSCH transmission, multiple control information (DCI) of the PDSCHs of the (N-1) additional TRPs are transmitted, and each DCI depends on the control information of the PDSCH transmitted from the serving TRP.

[0468] For example, DCI #0, which is control information of the PDSCH transmitted from the serving TRP (TRP #0), may include all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2, but multiple shortened DCIs (hereinafter referred to as sDCI) (sDCI #0 to sDCI #(N-2)) which are control information of the PDSCH transmitted from the collaborative TRPs (TRP #1 to TRP #(N-1)) may include only some information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2. Therefore, the sDCI for transmitting control information of the PDSCH transmitted from the collaborative TRP has a smaller payload than the normal DCI (nDCI) for transmitting control information related to the PDSCH transmitted from the serving TRP, and thus may include reserved bits compared to the nDCI.

[0469] In the above case #2, the freedom of each PDSCH control or allocation can be limited according to the content of the information elements included in the sDCI, but the reception capability of sDCI is better than that of nDCI, and therefore the probability of differences between DCI coverage ranges may become lower.

[0470] Case #3 N110 is an example of the following: in a situation where (N-1) different PDSCHs are transmitted from (N-1) additional TRPs (from TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for a single PDSCH transmission, one piece of control information (DCI) of the PDSCHs of the (N-1) additional TRPs is transmitted, and the DCI depends on the control information of the PDSCH transmitted from the serving TRP.

[0471] For example, in the case of DCI #0, which is control information for the PDSCH transmitted from the serving TRP (TRP #0), all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 may be included, and in the case of control information for the PDSCH transmitted from the collaborative TRPs (TRP #1 to TRP #(N-1)), only a portion of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 may be collected and transmitted in one "secondary" DCI (sDCI). For example, the sDCI may include at least one piece of HARQ-related information such as frequency domain resource allocation, time domain resource allocation, and the MCS of the collaborative TRP. In addition, information not included in the sDCI (such as a bandwidth part (BWP) indicator and a carrier indicator) may follow the DCI of the serving TRP (DCI #0, normal DCI, or nDCI).

[0472] In case #3 N110, each PDSCH control or allocation freedom can be restricted according to the content of the information element included in the sDCI, but the sDCI reception performance can be adjustable and the complexity of the UE's DCI blind decoding can be reduced compared to case #1 N100 or case #2 N105.

[0473] Case #4 N115 is an example of transmitting N-1 different PDSCHs from N-1 additional TRPs (TRP #1 to TRP #N-1) in addition to the serving TRP (TRP #0) used during a single PDSCH transmission. Control information for the PDSCHs transmitted from the N-1 additional TRPs is transmitted in the same DCI (long DCI) as the control information for the PDSCHs transmitted from the serving TRP. That is, the UE can obtain control information for PDSCHs transmitted from different TRPs (TRP #0 to TRP #(N-1)) through a single DCI. In case #4 N115, the complexity of the UE's DCI blind decoding may not increase, but the PDSCH control or allocation freedom may be lower, so that the number of collaborative TRPs is limited according to the long DCI payload limit.

[0474] In the following description and embodiments, sDCI may refer to each supplementary DCI, such as a shortened DCI, an auxiliary DCI, or a normal DCI including PDSCH control information transmitted in a collaborative TRP (the above-mentioned DCI formats 1_0 and 1_1), and unless specific limitations are mentioned, the corresponding description may be similarly applied to each supplementary DCI.

[0475] In the following description and embodiments, the aforementioned cases #1 N100, #2 N105, and #3 N110, in which one or more DCIs are used for NC-JT support, can be categorized as multi-PDCCH-based NC-JT, while case #4 N115, in which a single DCI (PDCCH) is used for NC-JT support, can be categorized as single-PDCCH-based NC-JT. In multi-PDCCH-based PDSCH transmission, the CORESET used to schedule DCI for the serving TRP (TRP #0) is separated from the CORESET used to schedule DCI for the cooperating TRPs (TRP #1 to TRP #(N-1)). Methods for distinguishing CORESETs include distinguishing by a higher layer indicator for each CORESET and distinguishing by the beam configuration for each CORESET. Furthermore, in single-PDCCH-based NC-JT, a single DCI is used to schedule a single PDSCH with multiple layers, rather than multiple PDSCHs, and these multiple layers can be transmitted from multiple TRPs. In this case, the association between the layer and the TRP of the transmission corresponding layer can be indicated by the transmission configuration indicator (TCI) indication of the layer.

[0476] According to an embodiment of the present disclosure, "collaborative TRP" can be replaced by various terms such as "collaborative panel" or "collaborative beam" in actual application.

[0477] According to an embodiment of the present disclosure, “a case where NC-JT is applied” may be interpreted differently depending on the environment as “a case where the UE receives one or more PDSCHs simultaneously in one BWP”, “a case where the UE receives PDSCHs simultaneously in one BWP based on two or more transmission configuration indicators (TCI) indications”, and “a case where the PDSCH received by the UE is associated with one or more DMRS port groups”. However, for ease of description, only one expression is used.

[0478] In the present disclosure, the radio protocol structure of NC-JT can be used in various ways according to the TRP deployment scenario. For example, if there is no backhaul delay or the backhaul delay between the cooperating TRPs is very small, a method using a structure based on MAC layer multiplexing (CA-type method) can be used. On the other hand, if the backhaul delay between the cooperating TRPs is so large that the backhaul delay cannot be ignored (for example, when the exchange of information such as CSI, scheduling, and HARQ-ACK between the cooperating TRPs takes 2 ms or longer), it may be possible to use a method similar to Figure 15 The DC protocol structure S20 is implemented by using an independent structure of each TRP starting from the RLC layer to ensure robustness against delay (DC-type method).

[0479] A UE that supports C-JT / NC-JT can receive C-JT / NC-JT related parameters or setting values ​​from a high-layer configuration and set the UE's RRC parameters based on them. For high-layer configuration, the UE can use UE capability parameters, such as tci-StatePDSCH. Here, the UE capability parameter (e.g., tci-StatePDSCH) can define the TCI states used for PDSCH transmission, and the number of TCI states can be configured as 4, 8, 16, 32, 64, and 128 in FR1 and as 64 and 128 in FR2, and among the configured numbers, a maximum of 8 states that can be indicated by 3 bits of the TCI field of the DCI can be configured through the MAC CE message. The maximum value of 128 can refer to the value indicated by the maxNumberConfiguredTCI statesPerCC in the parameter tci-StatePDSCH included in the UE's capability signaling. As described above, a series of configuration operations from high-layer configuration to MAC CE configuration can be applied to the beamforming indication or beamforming change command of at least one PDSCH in one TRP.

[0480] [Multiple TRPs based on multiple DCIs]

[0481] According to an embodiment of the present disclosure, a downlink control channel for NC-JT transmission may be configured based on multiple PDCCHs.

[0482] In NC-JT based on multiple PDCCHs, when transmitting DCI for scheduling the PDSCH of each TRP, each TRP may have a separate CORESET or search space. The CORESET or search space of each TRP can be configured according to at least one of the following situations.

[0483] Configuration of the high-layer index of each CORESET: The CORESET configuration information configured by the high-layer may include an index value, and the TRP used to transmit the PDCCH in the corresponding CORESET may be distinguished by the configured index value of each CORESET. That is, in a set of CORESETs having the same high-layer index value, the same TRP may be considered to transmit the PDCCH, or to transmit the PDCCH for scheduling the PDSCH of the same TRP. The index of each CORESET may be named CORESETPoolIndex, and in a CORESET configured with the same CORESETPoolIndex value, the PDCCH may be considered to be transmitted from the same TRP. In a CORESET that is not configured with the same CORESETPoolIndex value, the default value of CORESETPoolIndex may be considered to be configured, and the default value may be 0.

[0484] Multiple PDCCH-Config configuration: Multiple values ​​of PDCCH-Config can be configured in one BWP, and each PDCCH-Config can include the PDCCH configuration of each TRP. That is, the CORESET list of each TRP and / or the search space list of each TRP can be included in one PDCCH-Config, and one or more CORESETs and one or more search spaces included in one PDCCH-Config can be considered to correspond to a specific TRP.

[0485] CORESET beam / beam group configuration: The TRP corresponding to the corresponding CORESET can be distinguished by the beam or beam group configured for each CORESET. For example, when the same TCI state is configured in multiple CORESETs, it can be considered that the corresponding CORESETs are transmitted through the same TRP, or the PDCCH of the PDSCH scheduling the same TRP is transmitted in the corresponding CORESET.

[0486] Search space beam / beam group configuration: A beam or beam group can be configured for each search space, and the TRP used for each search space can be differentiated based on the configured beam or beam group. For example, when the same beam / beam group or TCI state is configured in multiple search spaces, the same TRP can transmit a PDCCH in the corresponding search space, or a PDCCH for scheduling a PDSCH for the same TRP can be transmitted in the corresponding search space.

[0487] As described above, by separating the CORESET or search space of each TRP, PDSCH and HARQ-ACK can be divided for each TRP, and thus, an independent HARQ-ACK codebook is generated for each TRP and independent PUCCH resources are used.

[0488] The CORESET or search space configuration described above according to the TRP can be independent for each cell or each BWP. For example, although two different CORESETPoolIndex values ​​can be configured in the PCell, no CORESETPoolIndex value can be configured in a specific SCell. In this case, NC-JT transmission can be configured in the PCell, but NC-JT transmission can not be configured in the SCell where no CORESETPoolIndex value is configured.

[0489] [Multiple TRPs based on a single DCI]

[0490] According to another embodiment of the present disclosure, a downlink beam for NC-JT transmission may be configured based on a single PDCCH.

[0491] In NC-JT based on a single PDCCH, a PDSCH transmitted by multiple TRPs can be scheduled via a DCI. Here, as a method of indicating the number of TRPs that transmit the corresponding PDSCH, the number of TCI states can be used. That is, when the number of TCI states indicated by the DCI for scheduling the PDSCH is 2, NC-JT transmission based on a single PDCCH can be considered, and when the number of TCI states is 1, single TRP transmission can be considered. The TCI state indicated by the DCI may correspond to one or two TCI states in the TCI states activated via the MAC-CE. If the TCI state of the DCI corresponds to two TCI states activated by the MAC CE, the TCI code point indicated by the DCI is associated with the TCI state activated by the MAC CE, and this may correspond to the following case: the number of TCI states corresponding to the TCI code point activated by the MAC CE is 2.

[0492] The above-described downlink beam configuration for NC-JT transmission can be independently configured for each cell or each BWP. For example, while the maximum number of activated TCI states corresponding to one TCI code point in the PCell is 2, the maximum number of activated TCI states corresponding to one TCI code point in a specific SCell may be 1. In this case, it can be considered that NC-JT can be configured in the PCell but not in the SCell.

[0493] [PHR]

[0494] Figure 18 is a diagram illustrating a process in which a base station controls the transmit power of a UE in a cellular system according to an embodiment of the present disclosure.

[0495] refer to Figure 18In operation 18-10, a UE within the coverage of the base station may perform downlink synchronization with the base station and acquire system information. According to an embodiment of the present disclosure, downlink synchronization may be performed using synchronization signals such as the Primary Synchronization Signal / Secondary Synchronization Signal (PSS / SSS) received from the base station. The UE, having performed downlink synchronization, may receive a Master Information Block (MIB) and a System Information Block (SIB) from the base station and acquire system information. In operation 18-15, the UE may perform uplink synchronization with the base station and establish a Radio Resource Control (RRC) connection via a random access procedure. During the random access procedure, the UE may transmit a random access preamble and Message 3 (msg3) to the base station via an uplink. In this case, uplink transmit power control may be performed when the random access preamble and Message 3 are transmitted. Specifically, the UE may receive parameters for uplink transmit power control from the base station via the acquired system information (e.g., SIB), or may perform uplink transmit power control using predetermined parameters. In another embodiment of the present disclosure, the UE may measure the reference signal received power (RSRP) based on the path attenuation estimation signal transmitted by the base station and may estimate the downlink path attenuation value as shown in Equation 7. In addition, based on the estimated path attenuation value, the UE may configure the uplink transmit power value for transmitting the random access preamble and Message 3.

[0496] [Equation 7]

[0497] Downlink path attenuation = base station signal transmit power - RSRP measured by the UE.

[0498] In [Equation 7], the transmit power of the base station signal may refer to the transmit power of the downlink path loss estimation signal transmitted by the base station. The downlink path loss estimation signal transmitted by the base station may be a cell-specific reference signal (CRS) or a synchronization signal block (SSB). If the path loss estimation signal is a cell-specific reference signal (CRS), the transmit power of the base station signal may indicate the transmit power of the CRS and may be transmitted to the UE via the referenceSignalPower parameter in the system information. If the path loss estimation signal is a synchronization signal block (SSB), the transmit power of the base station signal may indicate the transmit power of the secondary synchronization signal (SSS) and demodulation reference signal (DMRS) transmitted via the PBCH and may be transmitted to the UE via the ss-PBCH-BlockPower parameter in the system information. In operations 18-20, the UE may receive RRC parameters for uplink transmit power control from the base station via UE-specific RRC signaling or common RRC signaling. In this case, the received transmit power control parameters may differ depending on the uplink channel type and signal type. That is, the transmit power control parameters to be applied to transmit the physical uplink control channel (PUCCH), physical uplink shared channel (PUSCH), and sounding reference signal (SRS) may be different from each other. In addition, as described above, the transmit power control parameters received by the UE from the base station via the SIB before RRC connection establishment, or the transmit power control parameters used by the UE as predetermined values ​​before RRC connection establishment, may be included in the RRC parameters transmitted from the base station after RRC connection establishment. The UE may control uplink transmit power using the RRC parameter values ​​received from the base station after RRC connection establishment.

[0499] In operation 18-25, the UE may receive a path loss estimation signal from the base station. More specifically, after the UE's RRC connection is established, the base station may configure the Channel State Information Reference Signal (CSI-RS) as the path loss estimation signal for the UE. In this case, the base station may transmit information regarding the transmit power of the CSI-RS to the UE via the powerControlOffsetSS parameter in UE-specific RRC information. Here, powerControlOffsetSS may indicate the transmit power difference (offset) between the SSB and the CSI-RS. In operation 18-30, the UE may estimate the downlink path loss value and configure the uplink transmit power value. More specifically, the UE may measure the downlink RSRP using the CSI-RS and estimate the downlink path loss value using [Equation 7] using information regarding the transmit power of the CSI-RS received from the base station. Furthermore, based on the estimated downlink path loss value, the UE may configure the uplink transmit power value for PUCCH, PUSCH, and SRS transmissions. In operation 18-35, the UE may perform a power headroom report (PHR) to the base station. The power headroom may indicate the difference between the UE's current transmit power and the UE's maximum output power. In operation 18-40, the UE may optimize system operation based on the reported power headroom. For example, if the power headroom value reported by a specific UE to the base station is a positive value, the base station may allocate more resource blocks (RBs) to the UE, thereby increasing system output. In operation 18-45, the UE may receive a transmit power control (TPC) command from the base station. If the power headroom value reported by a specific UE to the base station is a negative value, the base station may allocate fewer resources to the UE or reduce the UE's transmit power via TPC. This may increase system throughput or reduce unnecessary power consumption of the UE. In operation 18-50, the UE may update its transmit power based on the TPC command. In this case, the TPC command may be transmitted to the UE via UE-specific DCI or group-common DCI. Therefore, the base station may dynamically control the UE's transmit power via the TPC command. In operation 18-55, the UE may perform uplink transmission based on the updated transmit power.

[0500] [PUSCH power control]

[0501] The PUSCH transmit power may be determined by the following Equation 8.

[0502] [Equation 8]

[0503] In Equation 8, is the maximum transmit power configured for the UE at carrier f in serving cell c in PUSCH transmission opportunity i. This is the reference configured transmit power configuration value for the activated uplink bandwidth part (BWP) b of carrier f of serving cell c, and has different values ​​for each transmission type j. This value may vary depending on whether the PUSCH transmission is a Message 3 PUSCH for random access, or whether the PUSCH is a configured grant PUSCH or a scheduled PUSCH. Indicates the frequency size to which PUSCH is allocated. The value indicating the degree of compensation rate of the path loss of the UL BWP b of the carrier f of the serving cell c may be configured by a higher layer signal and may have different values ​​according to j. is the downlink path loss estimate of the UL BWP b of carrier f serving cell c and is measured by the reference signal in the activated downlink bandwidth portion. The reference signal can be an SS / PBCH block or a CSI-RS. As described above in Equation 7, the downlink path loss can be calculated. In another embodiment of the present disclosure, represents the downlink path loss value and is the path loss calculated by the UE, as shown in Equation 7. The UE can calculate the path loss based on reference signal resources associated with the SS / PBCH block or CSI-RS, depending on whether a higher layer signal is configured. As the reference signal resource, one of multiple groups of reference signal resources can be selected based on a higher layer signal or an L1 signal, and the UE calculates the path loss based on the reference signal resources. is a value determined by the modulation and coding scheme (MCS) value of the PUSCH of the PUSCH transmission opportunity i of the UL BWP b of the carrier f of the serving cell c. It is the power control adjustment value, and the power value can be dynamically adjusted through TPC commands.

[0504] TPC commands are classified into accumulation mode and absolute mode, and one of the two modes is determined by a higher-layer signal. In accumulation mode, the power control adjustment value is determined by accumulating the currently determined power control adjustment value to the value indicated by the TPC command, and can be increased or decreased according to the TPC command, and has the following relationship: . is the value indicated by the TPC command. In absolute mode, the power control adjustment value is determined by the TPC command regardless of the currently determined power control adjustment value, and has the following relationship: Table 44 below shows the values ​​that the TPC command can indicate.

[0505] [Table 44]

[0506] [PUCCH power control]

[0507] The following Equation 9 is an equation for determining PUCCH transmission power.

[0508] [Equation 9]

[0509] In Equation 9, It is the reference configuration transmission power configuration value, according to various transmission types It has a different value and can be changed by a higher layer signal (such as RRC or MAC CE). If the value is changed via MAC CE, the UE determines the time from time slot k + k offset The changed value starts to be applied, where k is the time slot in which HARQ-ACK is transmitted for the PDSCH through which the MAC CE is received. offset The value of may vary depending on the subcarrier spacing and may be, for example, 3 ms. is the size of the frequency resource region to which the PUCCH is allocated. is the UE's path loss estimate and can be calculated by the UE based on various CSI-RS or specific reference signals in SS / PBCH according to whether higher layer signals are configured and their types, as described above with reference to Equation 7. Applicable to repeated transmission of PUCCH. Applicable to repeatedly transmitted PUCCH.

[0510] [NES Time Domain]

[0511] There are various methods to reduce power consumption at a base station. A representative method is to transmit and receive signals within limited time resources. By not transmitting or receiving signals within a specific time, the base station can avoid using the power required for transmission and reception.

[0512] From the base station's perspective, cell DTX can be divided into a first period during which signals are periodically transmitted and a second period during which no signals are transmitted. The first period can be referred to as an active period, and the second period as an inactive period. During the second period, the UE may not receive any signals, or may only receive some critical signals. For example, 1) the UE may not receive any signals during the second period. Alternatively, 2) the UE may only receive a synchronization signal (SSB) during the second period. Alternatively, 3) the UE may receive a synchronization signal (SSB), data that does not require HARQ feedback, and control information indicating the corresponding data information during the second period. Alternatively, 4) the UE may receive a synchronization signal (SSB), data that does not require HARQ feedback, control information indicating the corresponding data information, and a reference signal during the second period. The reference signal (RS) can be at least one of a DMRS, a CSI-RS, and a PRS. Alternatively, the reference signal can correspond to other reference signals used for channel estimation. Alternatively, 5) during the second period, the UE may receive a synchronization signal (SSB), data not requiring HARQ feedback, control information indicating corresponding data information, a reference signal, a PDCCH present in the UE common search space (CSS), and related data information. The reference signal (RS) may be at least one of a DMRS, a CSI-RS, and a PRS. Alternatively, the reference signal may correspond to another reference signal used for channel estimation.

[0513] From the base station's perspective, cell DRX can be divided into a first period during which signals are periodically received and a second period during which signals are not received. The first period can be referred to as the active period, and the second period can be referred to as the inactive period. During the second period, the UE can transmit or receive any signals, or can transmit only some critical signals. For example, 1) the UE can transmit no signals during the second period. Alternatively, 2) the UE can transmit only the PRACH and Msg.3 PUSCH during the second period. Alternatively, 3) the UE can transmit only the PRACH, PUSCH including Message 3 information, and a reference signal during the second period. The reference signal can correspond to an SRS or other reference signal used for uplink channel estimation. Alternatively, 4) the UE can transmit only the PRACH, PUSCH including Message 3 information, a reference signal, and a periodically transmitted signal during the second period. The reference signal can correspond to an SRS or other reference signal used for uplink channel estimation. The periodically transmitted signal can be an SR, CSI, or a configured granted PUSCH.

[0514] The above-mentioned base station can be applied as a transmitting node, and the UE can be applied as a receiving node. That is, the UE can be a transmitting node, and the base station can be a receiving node.

[0515] Figure 19 A signal transmission / reception period of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0516] refer to Figure 19 Cell DTX and cell DRX may have a common periodicity (period), a common first period (active), and a common second period (inactive), as shown in first example 1900. Alternatively, cell DTX and cell DRX may have different periodicities (periods), different first periods (active), and different second periods (inactive), as shown in second example 1902. Alternatively, cell DTX and cell DRX may have a common periodicity (period) but different first periods (active) and different second periods (inactive). Since cell DTX refers to a base station not periodically transmitting a signal during the second period (inactive), from the perspective of the UE, the UE may define this period as a period in which no signal is received, similar to UE DRX. Since cell DRX refers to a base station not periodically receiving a signal during the second period (inactive), from the perspective of the UE, the UE may define this period as a period in which no signal is transmitted, similar to UE DTX.

[0517] Since cell DTX means the base station does not transmit during the second (inactive) period, from the UE's perspective, other signals may overlap with the second period. If the corresponding signal is a downlink signal and the second period was previously configured by L2 signaling, such as RRC, the UE may consider the signal to overlap with the semi-static UL signal and cancel reception of the signal. If the corresponding signal is a downlink signal and the second period is indicated by L1 signaling, such as DCI, the UE may consider the semi-static flexible symbols indicated by the dynamic SFI to be UL. The UE may then consider the symbols to overlap with the signal and cancel reception of the signal. In this case, a processing timeline for canceling reception may be defined. For example, immediately after receiving the L1 signal, the UE may or may not cancel reception of the signal during a predetermined period (T1), and after T1, may cancel reception of the signal. If the corresponding signal is an uplink signal and the second period was previously configured by L2 signaling, such as RRC, the UE may consider the signal to overlap with the semi-static DL signal and cancel transmission of the signal. If the corresponding signal is an uplink signal and the second period is indicated by an L1 signal such as a DCI, the UE considers the semi-static flexible symbol indicated by the dynamic SFI to be DL. The UE may then consider the symbol to overlap with the signal and cancel transmission of the signal. In this case, a processing timeline for canceling transmission may be defined. For example, immediately after receiving the L1 signal, the UE may or may not cancel transmission of the signal during a predetermined period (T2), and after the T2 period, may cancel transmission of the signal.

[0518] Since cell DRX means the base station does not perform reception during the second (inactive) period, from the UE's perspective, other signals may overlap with the second period. If the corresponding signal is a downlink signal and the second period was previously configured by Layer 2 signaling, such as RRC, the UE may consider the signal to overlap with the semi-persistent UL signal and cancel reception of the signal. If the corresponding signal is a downlink signal and the second period is indicated by Layer 1 signaling, such as DCI, the UE may consider the semi-persistent flexible symbols indicated by the dynamic SFI to be UL. The UE may then consider the symbols to overlap with the signal and cancel reception of the signal. In this case, a processing timeline for canceling reception may be defined. For example, immediately after receiving the Layer 1 signal, the UE may or may not cancel reception of the signal for a predetermined period (T1), and after T1, may cancel reception of the signal. If the corresponding signal is an uplink signal and the second period was previously configured by Layer 2 signaling, such as RRC, the UE may consider the signal to overlap with the semi-persistent DL signal and cancel transmission of the signal. If the corresponding signal is an uplink signal and the second period is indicated by an L1 signal such as a DCI, the UE considers the semi-static flexible symbol indicated by the dynamic SFI to be DL. The UE may then consider the symbol to overlap with the signal and cancel transmission of the signal. In this case, a processing timeline for canceling transmission may be defined. For example, immediately after receiving the L1 signal, the UE may or may not cancel transmission of the signal during a predetermined period (T2), and after the T2 period, may cancel transmission of the signal.

[0519] Cell DTX and cell DRX apply even in environments where data is transmitted and received over multiple carriers. In these cases, cell DTX and cell DRX can be applied separately to the corresponding carriers. Therefore, the configuration information can be provided by each higher-layer signal. Alternatively, common cell DTX and cell DRX can be applied to all carriers. Therefore, the corresponding configuration information can be provided by a single higher-layer signal. Alternatively, the UE can determine that the configuration information for cell DTX and cell DRX applied to the PCell also applies to the SCell.

[0520] [NES space domain]

[0521] As a method for reducing power consumption at the base station, a limited number of transmit / receive antennas installed at the base station can be used. For example, if a base station equipped with 64 transmit / receive antennas transmits and receives signals under certain conditions by using only 32 transmit / receive antennas, the power consumption required for antenna operation can be reduced by at least half. The base station can notify the UE via a separate L1 or L2 signal whether the number of transmit / receive antennas has been adjusted. Specifically, the base station can indicate to a specific UE or UE group by signal that a limited number of transmit antennas, receive antennas, or transmit / receive antennas has been periodically or temporarily applied during a specific period.

[0522] [Example Introduction]

[0523] In the aforementioned method for reducing power consumption at a base station, a method for operating a UE for performance enhancement when DTX / DRX is applied in a carrier aggregation environment is described. Furthermore, in the aforementioned method for reducing power consumption at a base station, a method for operating a UE for coverage enhancement when the number of transmit / receive antennas is adjusted is described.

[0524] <First embodiment: Cell DRX operation method 1 in a CA environment>

[0525] In the first embodiment of the present disclosure, in the case where a UE transmits and receives signals with a base station through multiple cells, a cell DRX or cell DTX period may be configured differently for each cell.

[0526] Figure 20 The operation of the UE when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure is shown. Figure 20 In the example shown, in a scenario where a first cell and a second cell exist, during a specific time period, when the first cell is in the second time period (inactive), the second cell may be in the first time period (active). The L1 or L2 signals for configuring the first and second time periods for cell DRX or cell DTX may exist separately, or may simultaneously indicate different time periods for each cell. In this scenario, if the first cell is a PCell, the UE may not be able to transmit the PUCCH, which is transmittable only in the PCell, during the second time period. Therefore, the UE may need to transmit the non-transmittable PUCCH via a cell other than the PCell. Therefore, a detailed description will be provided with reference to the following detailed embodiments.

[0527] <Example (1-1): Same Subcarrier Spacing and Single Transmission Support>

[0528] As a detailed embodiment of the present disclosure, in a scenario where multiple cells have the same subcarrier spacing and perform single PUCCH transmission, when the PUCCH to be transmitted in the Pcell overlaps with the second time period, the UE may transmit the PUCCH in the Scell ​​instead of the Pcell when the PUCCH to be transmitted in the Pcell overlaps with the second time period. The Scell ​​index value may be pre-specified by a higher-layer signal and may have one or more index values. If there are multiple Scell ​​index values, the Scell ​​index values ​​are sorted in order. If both the Pcell and the Scell ​​in the next sequence overlap with the second time period, and the Scell ​​in the subsequent sequence does not overlap with the second time period, the UE may perform PUCCH transmission in the Scell. Alternatively, the UE may determine the cell to transmit the PUCCH based on the ascending order of the cell index. Alternatively, the UE may determine the set of cells for which the first time period is configured in a specific time slot or a group of specific time slots, and perform PUCCH transmission in the cell with the lowest index or the cell with the highest index in the set. When determining the set of cells for which the first time period is configured, the UE may indicate the set of all configured cells or the set of specific cells configured by a separate higher-layer signal. For reference, the set of cells may or may not always include Pcell. If the set of cells includes Pcell, when Pcell is in the first time period, the Pcell may be selected first regardless of the cell index. If the set of cells does not include Pcell, the UE can determine whether the cells included in the set belong to the first time period only when Pcell is included in the second time period. If all cells in the set including Pcell belong to the second time period, the UE can discard PUCCH transmission. As a signal for determining whether each cell is in the first time period or the second time period, only high-layer signals, only L1 signals, or both signals may be considered. As Figure 20 As shown in the figure, as an example, if the first cell is a Pcell, the UE can transmit the PUCCH in the first period of the second cell, which cannot be transmitted in the second period. This may not apply to all UEs, but only to UEs that can perform the corresponding operation. The UE then reports this UE capability to the base station. Thereafter, if a second period occurs in the Pcell due to a separate higher-layer signal, the base station can indicate to the UE that reported this capability whether the PUCCH can be transmitted in the Scell ​​instead of the Pcell.

[0529] <Example (1-2): Same subcarrier spacing, single transmission support, and UE supports PUCCH cell switching>

[0530] As a detailed embodiment of the present disclosure, the UE can directly select the cell to transmit the PUCCH through a high-layer signal or an L1 signal based on the cell DRX, rather than periodically selecting the cell to transmit the PUCCH based on the first time period and the second time period information. For example, through the PUCCH transmission cell selection method based on high-layer signals, the base station can notify the UE of the set of cells that can transmit the PUCCH during a specific time period. For example, the bitmap is configured by 10 bits and indicates a value of 0 or 1. If the bitmap indicates 0, this means Pcell, and if the bitmap indicates 1, this can mean a specific single Scell. Therefore, if the bitmap indicates 0000011111, it can be noted that the UE can transmit PUCCH through the Pcell in the first five time slots during the 10-time slot period, and can transmit PUCCH through the Scell ​​in the next five time slots. This is called a PUCCH cell switching method based on high-layer signals. As another example, the L1 signal-based PUCCH transmission cell selection method indicates that in the received DCI information for PUCCH transmission, the UE directly receives the cell index information about the cell to transmit the PUCCH. Therefore, in addition to the time resource and frequency resource on which the PUCCH is to be transmitted, the UE can also obtain even cell information through the DCI information. This is called the L1 signal-based PUCCH cell switching method. Therefore, if Figure 20 In the same situation, if the specific time period of the first cell is the second time period, the base station can apply a PUCCH cell switching method based on a higher layer signal or a PUCCH cell switching method based on an L1 signal to a UE capable of supporting PUCCH cell switching, so as to support the UE to transmit PUCCH resources in the first time period of the second cell. However, the signal that periodically indicates the cell DRX of the first time period and the second time period and the signal that indicates the PUCCH cell switching method can provide conflicting information to the UE. For example, an indication of transmitting PUCCH through the second cell is provided by the PUCCH cell switching method, but due to the cell DRX signal, the corresponding time period can be the second time period. Alternatively, the PUCCH cell switching method is generally a method that performs configuration for each UE, while the cell DRX can correspond to UE group-specific information or cell-common information. Therefore, for each UE, the two signals can provide conflicting information within a specific time period. Since the method of configuring cell DRX is generally classified into a method using a higher layer signal for indication and a method using an L1 signal for indication, and the method of indicating the PUCCH cell switching method is also generally classified into a method using a higher layer signal for indication and a method using an L1 signal for indication, the following scenario exists and describes possible UE operations.

[0531] - Case A-1: ​​Cell DRX based on higher layer signals and PUCCH cell switching based on higher layer signals

[0532] If a higher-layer signal (a first signal) is used to configure a UE with information regarding a first and second cell DRX period, and PUCCH cell switching information is configured via another higher-layer signal (a second signal), the UE may prioritize the first signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and the cell DRX configuration indicates that the Pcell is in the corresponding period as the second period, the UE prioritizes the first signal and, therefore, does not perform PUCCH transmission in the Pcell during the corresponding period. Furthermore, since the Pcell corresponds to the second period, the UE may be configured to perform PUCCH transmission in a specific Scell ​​other than the Pcell through a separate UE capability or a separate higher-layer signal.

[0533] Alternatively, if information regarding a first period and a second period of cell DRX is configured for the UE via a higher-layer signal (a first signal), and PUCCH cell switching information is configured via another higher-layer signal (a second signal), the UE may prioritize the second signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and if the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE may prioritize the second signal to perform PUCCH transmission in the Pcell for the corresponding period.

[0534] - Case A-2: Cell DRX based on higher layer signals and PUCCH cell switching based on L1 signals

[0535] If information regarding a first and second cell DRX period is configured for a UE via a higher-layer signal (a first signal), and PUCCH cell switching information is configured via an L1 signal (a second signal), the UE may prioritize the first signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and if the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE will not prioritize the first signal to perform PUCCH transmission in the Pcell for the corresponding period. Furthermore, the Pcell may be in the second period, and therefore the UE may perform PUCCH transmission in a specific Scell ​​other than the Pcell due to individual UE capabilities or individual higher-layer signal configuration.

[0536] Alternatively, if information regarding a first and second period of cell DRX is configured for the UE via a higher layer signal (a first signal), and PUCCH cell switching information is configured via an L1 signal (a second signal), the UE may prioritize the second signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and if the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE may prioritize the second signal to perform PUCCH transmission in the Pcell for the corresponding period.

[0537] - Case A-3: Cell DRX based on L1 signal and PUCCH cell switching based on higher layer signal

[0538] If information regarding first and second periods of cell DRX is configured for a UE via an L1 signal (a first signal), and PUCCH cell switching information is configured via a higher-layer signal (a second signal), the UE may prioritize the first signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and if the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE will not prioritize the first signal to perform PUCCH transmission in the Pcell for the corresponding period. Furthermore, the Pcell may be in the second period, and therefore the UE may perform PUCCH transmission in a specific Scell ​​other than the Pcell due to individual UE capabilities or individual higher-layer signal configuration.

[0539] Alternatively, if information regarding a first period and a second period of cell DRX is configured for the UE via a higher layer signal (a first signal), and PUCCH cell switching information is configured via an L1 signal (a second signal), the UE may prioritize the second signal. For example, if the PUCCH cell switching information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, and if the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE may prioritize the second signal and perform PUCCH transmission in the Pcell for the corresponding period.

[0540] - Case A-4: L1-based cell DRX and L1-based PUCCH cell switching

[0541] If information about the first and second periods of cell DRX is configured for a UE via an L1 signal (a first signal), and PUCCH cell handover information is configured via the L1 signal (a second signal), the UE may prioritize the first signal. For example, if the PUCCH cell handover information indicates that PUCCH transmission is to be performed in the Pcell during a specific period, when the second period is indicated by the cell DRX configuration in the Pcell for the corresponding period, the UE will not prioritize the first signal to perform PUCCH transmission in the Pcell for the corresponding period. Furthermore, the Pcell is in the second period, and therefore the UE may perform PUCCH transmission in a specific Scell ​​other than the Pcell due to individual UE capabilities or individual higher-layer signal configurations. Alternatively, if information about the first and second periods of cell DRX is configured for the UE via a higher-layer signal (a first signal), and PUCCH cell handover information is configured via the L1 signal (a second signal), the UE may prioritize the second signal. For example, in a case where PUCCH cell switching information indicates that PUCCH transmission is performed in Pcell during a specific time period, when a second time period is indicated by the cell DRX configuration in Pcell of the corresponding time period, the UE performs PUCCH transmission in Pcell of the corresponding time period by prioritizing the second signal.

[0542] <Examples 1-3: Different Subcarrier Spacings and Single Transmission Support>

[0543] In the first embodiment (1-1), it is assumed that when a UE transmits a PUCCH that needs to be transmitted through a Pcell through an Scell ​​instead of a Pcell according to the cell DRX configuration, the Pcell and Scell ​​have the same subcarrier spacing. However, this embodiment describes the UE operation when the Pcell and Scell ​​have different subcarrier spacings.

[0544] Figure 21 FIG. 2 shows an operation of a UE when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure. Figure 21As shown, as an example, when the first cell has a 30 kHz subcarrier spacing and the second cell has a 15 kHz subcarrier spacing, one timeslot of the second cell may overlap with two timeslots of the first cell. In this case, if the first cell is a PCell and the second period is configured as cell DRX by a higher layer signal or L1 signal, the UE cannot perform PUCCH transmission via the PCell during this period. Therefore, if the first period of the second cell is configured as cell DRX or is not configured at all, a method of transmitting PUCCH via the second cell rather than the first cell, which is the PCell, can be considered. However, the two timeslots of the first cell and the one timeslot of the second cell overlap, and therefore, using the one overlapping timeslot of the second cell to transmit all PUCCHs present in the corresponding timeslots of the first cell requires a separate multiplexing method. Therefore, as a simple method, only PUCCHs belonging to a specific timeslot of the two timeslots in the first cell can be transmitted and received in the one overlapping timeslot of the second cell. In this case, methods of multiplexing PUCCHs scheduled in different timeslots can be avoided. Various criteria may exist for determining the specific timeslots. For example, if a PUCCH is transmitted via an Scell ​​instead of a Pcell, and one time slot of the Scell ​​overlaps with multiple time slots of the Pcell, then only the PUCCH scheduled in the first time slot among the multiple time slots of the Pcell may be transmitted and received in the overlapping time slot of the Scell. If there is no scheduled PUCCH in the time slot, the UE does not perform PUCCH transmission in the Scell. As another example, if a PUCCH is transmitted via an Scell ​​instead of a Pcell, and one time slot of the Scell ​​overlaps with multiple time slots of the Pcell, then only the PUCCH scheduled in the last time slot among the multiple time slots of the Pcell may be transmitted and received in the overlapping time slot of the Scell. If there is no scheduled PUCCH in the time slot, the UE does not perform PUCCH transmission in the Scell. As another example, if a PUCCH is transmitted via an Scell ​​instead of a Pcell, and one time slot of the Scell ​​overlaps with multiple time slots of the Pcell, then only the PUCCH scheduled in the time slot configured by a separate higher layer signal among the multiple time slots of the Pcell may be transmitted and received in the overlapping time slot of the Scell. If there is no scheduled PUCCH in a timeslot, the UE may not perform PUCCH transmission in the Scell. As another example, if PUCCH is transmitted via the Scell ​​instead of the Pcell, and one timeslot of the Scell ​​overlaps with multiple timeslots of the Pcell, only the PUCCH scheduled in the first timeslot among the timeslots in which PUCCH is scheduled in the multiple timeslots of the Pcell may be transmitted and received in the overlapping timeslot of the Scell.As another example, if PUCCH is transmitted through the Scell ​​instead of the Pcell, and one time slot of the Scell ​​overlaps with multiple time slots of the Pcell, only the PUCCH scheduled in the last time slot among the time slots in which PUCCH is scheduled in the multiple time slots of the Pcell can be transmitted and received in the overlapping time slot of the Scell.

[0545] like Figure 21 As shown, the subcarrier spacing of the first cell is assumed and the subcarrier spacing of the second cell is assumed, but the opposite situation may also occur. That is, the subcarrier spacing of the first cell may be smaller than the subcarrier spacing of the second cell. In this case, one time slot of the first cell may overlap with multiple time slots of the second cell. For example, when the first cell has a subcarrier spacing of 15 kHz and the second cell has a subcarrier spacing of 30 kHz, one time slot of the first cell overlaps with two time slots of the second cell. In this case, when the first cell is a Pcell and the second cell is an Scell, and a specific time period of the first cell is configured as a second time period due to cell DRX, the UE cannot perform PUCCH transmission during the corresponding time period of the Pcell. In the same time period, the Scell ​​as the second cell may be configured to be in the first time period through cell DRX, or the cell DRX configuration may not be provided to the second cell. Therefore, the PUCCH that cannot be transmitted in the corresponding time period of the Pcell can be transmitted by the Scell ​​as the second cell. In this case, since one time slot of the first cell overlaps with multiple time slots of the second cell, as described above, the UE needs to determine the time slot in which the PUCCH needs to be transmitted among the multiple overlapping time slots of the second cell. For example, the UE may transmit the PUCCH scheduled in the first cell in the first time slot among the multiple time slots in the second cell that overlap with one time slot of the first cell. As another example, the UE may transmit the PUCCH scheduled in the first cell in the last time slot among the multiple time slots in the second cell that overlap with one time slot of the first cell. As another example, the UE may transmit the PUCCH scheduled in the first cell in a specific time slot configured by a separate higher layer signal among the multiple time slots in the second cell that overlap with one time slot of the first cell.

[0546] <Example (1-4): Repeated Transmission>

[0547] As a detailed embodiment of the present disclosure, when the UE performs repeated transmission of an uplink control signal or a data signal (first signal), if the second period (inactive) is configured by cell DRX, it may be necessary to define the operation of the UE.

[0548] Figure 22Operation of a UE when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure is illustrated. Figure 22 The following illustrates a case where a first signal is scheduled to be repeatedly transmitted four times across four time slots starting from the first time slot. The time resources of the first signal repeatedly transmitted in each time slot are the same. In this case, if the third and fourth time slots are configured as the second time period and the remaining time slots are configured as the first time period, the UE may consider the following method.

[0549] - Method A-1: ​​If the second time period is configured by a higher layer signal, the UE discards the third and fourth scheduled first signals 2205 and 2207. Therefore, even if the UE is scheduled to repeatedly transmit the first signal four times, in practice, the UE only performs repeated transmissions 2201 and 2203 of the first signal in the first time slot and the second time slot.

[0550] - Method A-2: If the second time period is configured by the L1 signal, the UE discards the third and fourth scheduled first signals 2205 and 2207. Therefore, even if the UE is scheduled to repeatedly transmit the first signal four times, in practice, the UE may only perform repeated transmissions 2201 and 2203 of the first signal in the first time slot and the second time slot.

[0551] - Method A-3: If the second time period is configured by a higher layer signal, the UE does not transmit the third and fourth scheduled first signals 2205 and 2207, and performs the remaining repetitive transmissions in the subsequent first time period. Therefore, the UE performs repetitive transmissions 2201, 2203, 2209, and 2211 of the first signal scheduled for four repetitive transmissions in the first, second, fifth, and sixth time slots.

[0552] - Method A-4: If the second time period is configured by the L1 signal, the UE does not transmit the third and fourth scheduled first signals 2205 and 2207, and may perform the remaining repeated transmissions in the subsequent first time period. Therefore, the UE may perform repeated transmissions 2201, 2203, 2209, and 2211 of the first signal scheduled for four repeated transmissions in the first, second, fifth, and sixth time slots.

[0553] - Method A-5: A combination of the above methods may be possible. Alternatively, as Figure 22As shown, when multiple carriers are configured for a UE, when the third and fourth time slots in the cell that schedules repeated transmission of the first signal correspond to the second time period, but the corresponding time slots in another cell correspond to the first time period, the UE can transmit the first signal scheduled in the third and fourth time slots through the other cell. If the subcarrier spacing is different, at least one of the methods described in embodiments (1-3) can be considered.

[0554] <Second embodiment: Cell DRX operation method 2 in a CA environment>

[0555] According to embodiments of the present disclosure, two different signals can be scheduled to a UE via multiple carriers, overlapping in time resources. A first combination of possible signals may indicate that the first signal is a PUSCH and the second signal is a PUSH, a second combination may indicate that the first signal is a PUCCH and the second signal is a PUSCH, and a third combination may indicate that the first signal is a PUCCH and the second signal is a PUCCH. In the first combination, two different signals can be transmitted simultaneously. In the second combination, if the PUCCH and PUSCH have the same priority information, the UCI included in the PUCCH can be transmitted by appending it to the PUSCH. If the PUCCH and PUSCH have different priorities, only the signal with the higher priority of the two signals can be transmitted. For example, if the PUCCH has a higher priority than the PUSCH, the UE can transmit the PUCCH and discard the PUSCH. Alternatively, only if the PUCCH and PUSCH have different priorities can the UE transmit the PUCCH and PUSCH on different carriers. The UE can perform this operation and receive relevant higher-layer signals from the base station only if the UE has the capability to perform this operation (first capability). Alternatively, even if the PUCCH and PUSCH have different priorities, the UE can append the UCI present in the PUCCH to the PUSCH. The UE can perform this operation only if it has the capability (second capability) and has received relevant higher-layer signals from the base station. In the case of the third combination, the transmittable PUCCHs scheduled on different carriers may be limited if the respective carriers belong to different PUCCH groups.

[0556] Figure 23The following scenario is illustrated: in a limited scenario where the PUCCH (first signal) and PUSCH (second signal) have different priorities, based on the second combination according to embodiments of the present disclosure, when a UE transmits PUCCH and PUSCH on different carriers (first cell and second cell), the period to which the PUCCH belongs overlaps with the second period of cell DRX, and the UE may therefore be unable to perform PUCCH transmission. In this case, if the UE is capable of performing PUSCH transmission in the second cell, the UE can transmit UCI belonging to the PUCCH by appending it to the PUSCH. This operation can only be applied when a separate higher layer signal is provided to the UE. Alternatively, this operation can only be applied when the UE has both the first and second capabilities. This operation can only be applied when the cell DTX-related signal indicating the second period is a higher layer signal. Alternatively, this operation can only be applied when the cell DTX-related signal indicating the second period is an L1 signal. Alternatively, this operation can only be applied when the cell DTX-related signal indicating the second period is a combination of a higher layer signal and an L1 signal.

[0557] Figure 24 Operation of a UE when DTX / DRX is applied in a CA environment in a wireless communication system according to an embodiment of the present disclosure is illustrated. Figure 24 The following case is shown: Based on the first combination of the embodiments of the present disclosure, when PUCCH (first signal) and PUSCH (second signal) are scheduled on different carriers and at least one symbol overlaps in time resources, the UE can attach UCI belonging to PUCCH to PUSCH. In this case, when the carrier scheduling the second signal overlaps with the second period of cell DTX, UCI belonging to PUCCH can be attached to PUSCH, and therefore, the UE may not be able to transmit control information and data information included in PUCCH and PUSCH. Therefore, when the second signal overlaps with the second period, as shown in FIG. Figure 24 As shown, the UE does not perform attachment and can transmit PUCCH in the first cell. This operation can be applied only when a separate high-layer signal is provided to the UE. This operation can be applied only when the cell DTX-related signal indicating the second period is a high-layer signal. Alternatively, this operation can be applied only when the cell DTX-related signal indicating the second period is an L1 signal. Alternatively, this operation can be applied only when the cell DTX-related signal indicating the second period is an L1 signal and the UE fails to correctly receive the related L1 signal. Alternatively, this operation can be applied only when the cell DTX-related signal indicating the second period is a combination of a high-layer signal and an L1 signal.

[0558] In the first and second embodiments, the UE operation in the case where the cell DTX or cell DRX related first and second period configuration information is provided differently for each cell (or carrier) in the CA situation has been described. Figure 25 Describe the relevant UE operation flow chart.

[0559] Figure 25 The operation of a UE in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0560] refer to Figure 25 In operation 2505, after receiving the CA configuration, the UE may receive cell DRX information through a higher layer signal or an L1 signal.

[0561] Thereafter, in operation 2510, in a case where an uplink signal (first signal) scheduled by a different signal is scheduled in a first cell, when at least one symbol of the time resource of the corresponding first signal overlaps with the second time period, the UE can determine whether transmission can be performed in a cell other than the first cell.

[0562] Then, in operation 2515, when a cell in which transmission is possible is determined, the UE may transmit the first signal in the cell. Therefore, the UE may reduce the transmission delay time.

[0563] <Third Embodiment: Coverage Enhancement Method in an Environment Using Limited Transmit / Receive Antennas>

[0564] As a method for reducing power consumption at base stations, one approach could be to limit the number of transmit / receive antennas installed in base station equipment used for actual signal transmission and reception. For example, if a base station equipped with 128 antennas uses only 64 antennas for actual signal transmission and reception during a specific period, the power consumption required to operate the antennas could theoretically be reduced by at least half. However, due to the limited number of antennas, the base station's operational coverage area may be relatively reduced. Therefore, if a signal providing information about the limited number of antennas is provided to a UE, the UE can determine whether to apply repeated transmission for downlink signal reception or uplink signal transmission. Furthermore, repeated transmission may only apply to specific downlink signals, such as at least one of the SSB, PBCH, PDCCH, and PDSCH. Furthermore, repeated transmission may only apply to specific uplink signals, such as at least one of the PUCCH, PUSCH, and PRACH. The signal providing information about the limited number of antennas can be a UE-common signal or a UE-specific signal. Alternatively, the signal providing information about the limited number of antennas can be indirectly transmitted to the UE by indicating a parameter difference in the power offset value between the PDSCH and the CSI-RS. Alternatively, a related signal providing information about a limited number of antennas may be indirectly transmitted to the UE by a parameter indicating a maximum power transmission value of the base station. In an example, in the case where the UE has received a related signal providing information about a limited number of antennas, the UE may perform repetition transmissions X times the count indicated by the information received in the original scheduling. Alternatively, the base station may directly notify the UE of the repetition transmission count that needs to be added. Alternatively, the UE may implicitly determine the repetition transmission count that needs to be added by providing a related implicit signal providing information about a limited number of antennas. The implicit determination method may refer to determining the repetition transmission value that needs to be added based on information provided by the base station using a separate standardized table.

[0565] Figure 26 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0566] refer to Figure 26 The UE may include a transceiver as a whole, including a UE receiver 2600 and a UE transmitter 2610, a memory (not shown), and a UE processor 2605 (or a UE controller or processor). The UE transceivers 2600 and 2610, the memory, and the UE processor 2605 may operate according to the above-described communication method of the UE. The components of the UE are not limited to the above examples. For example, the UE may include a greater or lesser number of components than those described above. Furthermore, the transceiver, memory, and processor may be implemented as a single chip.

[0567] A transceiver can transmit and receive signals with a base station. The signals may include control information and data. To this end, the transceiver may include an RF transmitter configured to amplify and up-convert the frequency of the transmitted signal, an RF receiver configured to perform low-noise amplification and down-convert the frequency of the received signal, and the like. However, this is merely an embodiment of a transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver.

[0568] In addition, the transceiver may receive a signal through a radio channel, output the signal to the processor, and transmit a signal output from the processor through the radio channel.

[0569] The memory can store programs and data necessary for the operation of the base station. In addition, the memory can store control information or data included in the signals transmitted / received by the UE. The memory can include storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. In addition, the memory can include multiple memories.

[0570] The processor may control a series of processes so that the UE can operate according to the above-described embodiments. For example, the processor may control components of the UE to receive DCI configured in two layers in order to simultaneously receive multiple PDSCHs. The processor may include multiple processors, and the processor may execute a program stored in a memory to perform operations to control components of the UE.

[0571] Figure 27 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0572] refer to Figure 27 The base station may include a transceiver as a whole, including a base station receiver 2700 and a base station transmitter 2710, a memory (not shown), and a base station processor 2705 (or base station controller or processor). Base station transceivers 2700 and 2710, the memory, and the base station processor 2705 may operate according to the aforementioned base station communication method. However, the components of the base station are not limited to the aforementioned examples. For example, the base station may include a greater or lesser number of components than those described above. Furthermore, the transceiver, memory, and processor may be implemented as a single chip.

[0573] The transceiver can transmit and receive signals with the UE. The signals may include control information and data. To this end, the transceiver may include an RF transmitter configured to amplify and up-convert the frequency of the transmitted signal, an RF receiver configured to perform low-noise amplification and down-convert the frequency of the received signal, and the like. However, this is merely an embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and the RF receiver.

[0574] In addition, the transceiver may receive a signal through a radio channel, output the signal to the processor, and transmit a signal output from the processor through the radio channel.

[0575] The memory can store programs and data necessary for the operation of the base station. In addition, the memory can store control information or data included in the signals transmitted / received by the base station. The memory can include storage media such as ROM, RAM, hard disk, CD-ROM, and DVD, or a combination of storage media. In addition, the memory can include multiple memories.

[0576] The processor may control a series of processes so that the base station can operate according to the above-described embodiments of the present disclosure. For example, the processor may control the components of the base station to configure DCI configured in two layers including allocation information about multiple PDSCHs and transmit the configured DCI. The processor may include multiple processors, and the processor may execute the operations of the components of the base station by executing a program stored in a memory.

[0577] The methods disclosed in the claims and / or the methods according to the embodiments described in the specification of the present disclosure may be implemented by hardware, software, or a combination of hardware and software.

[0578] When the method is implemented by software, a computer-readable storage medium storing one or more programs (software modules) may be provided. The one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within an electronic device. At least one program includes instructions that cause the electronic device to perform the methods defined in the appended claims and / or disclosed herein according to various embodiments of the present disclosure.

[0579] These programs (software modules or software) may be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), magnetic disk storage, compact disc-ROM (CD-ROM), digital versatile disc (DVD) or other types of optical storage, or magnetic tape cassettes. Alternatively, any combination of some or all of these may form the memory in which the programs are stored. In addition, multiple such memories may be included in the electronic device.

[0580] In addition, the program may be stored in an attachable storage device that can access the electronic device via a communication network such as the Internet, an intranet, a local area network (LAN), a wide area LAN (WLAN), and a storage area network (SAN), or a combination thereof. These storage devices can access the electronic device via an external port. Alternatively, a separate storage device on a communication network can access the portable electronic device.

[0581] In the above detailed embodiments of the present disclosure, the elements included in the present disclosure are expressed in the singular or plural, depending on the detailed embodiment presented. However, for ease of description, the singular form or plural form is appropriately selected for the situation presented, and the present disclosure is not limited to elements expressed in the singular or plural. Therefore, an element expressed in the plural may also include a single element, or an element expressed in the singular may also include multiple elements.

[0582] The embodiments of the present disclosure described and illustrated in the specification and the drawings are merely specific embodiments presented for the purpose of easily explaining the technical content of the present disclosure and helping to understand the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical ideas of the present disclosure can be implemented. In addition, if necessary, the above-mentioned corresponding embodiments can be used in combination. For example, a part of an embodiment of the present disclosure can be combined with a part of another embodiment to operate a base station and a terminal. As an example, a part of the first embodiment of the present disclosure can be combined with a part of the second embodiment to operate a base station and a terminal. In addition, although the above embodiments have been described based on an FDD LTE system, other variations based on the technical ideas of the embodiments can also be implemented in other communication systems such as TDD LTE and 5G or NR systems.

[0583] In the drawings describing the method of the present disclosure, the order of description does not always correspond to the order of performing the steps, and the sequential relationship between the steps may be changed or the steps may be performed in parallel.

[0584] Alternatively, in the drawings describing the method of the present disclosure, some elements may be omitted, and only some of the elements may be included without departing from the essential spirit and scope of the present disclosure.

[0585] Additionally, in the methods of the present disclosure, some or all of the contents of each embodiment may be implemented in combination without departing from the essential spirit and scope of the present disclosure.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving a first signal from a base station, the first signal including information related to discontinuous reception (DRX) of a first cell; as well as identifying a cell DRX inactive period based on the cell DRX related information, The second signal is not transmitted to the base station in a time slot corresponding to the DRX inactive period of the cell.

2. The method according to claim 1, wherein The cell DRX of the first cell and the cell DRX of a second cell different from the first cell are independently indicated.

3. The method according to claim 1, wherein The first signal includes radio resource control (RRC) signaling for configuring the cell DRX or downlink control information (DCI) for indicating the cell DRX.

4. The method according to claim 1, wherein The second signal includes a signal transmitted through a physical uplink control channel PUCCH repetition.

5. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver; as well as a controller coupled to the transceiver, Wherein, the controller is configured as follows: receiving a first signal from a base station, the first signal including information related to discontinuous reception (DRX) of a first cell; and identifying a cell DRX inactive period based on the cell DRX related information, The second signal is not transmitted to the base station in a time slot corresponding to the DRX inactive period of the cell. The UE according to claim 5 , wherein: The cell DRX of the first cell and the cell DRX of a second cell different from the first cell are independently indicated.

7. The UE according to claim 5, wherein: The first signal includes radio resource control (RRC) signaling for configuring the cell DRX or downlink control information (DCI) for indicating the cell DRX.

8. The UE according to claim 5, wherein: The second signal includes a signal transmitted through a physical uplink control channel PUCCH repetition.

9. A method performed by a base station in a wireless communication system, the method comprising: transmitting a first signal to a user equipment (UE), where the first signal includes information related to discontinuous reception (DRX) of a first cell; The second signal is not received from the UE in a time slot corresponding to a cell DRX inactive period.

10. The method according to claim 9, wherein: The cell DRX of the first cell and the cell DRX of a second cell different from the first cell are independently indicated.

11. The method according to claim 9, wherein The first signal includes radio resource control (RRC) signaling for configuring the cell DRX or downlink control information (DCI) for indicating the cell DRX.

12. The method according to claim 9, wherein The configured uplink grant and hybrid automatic repeat request (HARQ) information associated with the time slot corresponding to the inactive period are not transmitted to the HARQ entity, and Wherein, channel state information CSI reporting from the UE is not performed.

13. A base station in a wireless communication system, the base station comprising: transceiver; as well as a controller coupled to the transceiver, The controller is configured to transmit a first signal to a user equipment (UE), wherein the first signal includes information related to discontinuous reception (DRX) of a first cell, and The second signal is not received from the UE in a time slot corresponding to a cell DRX inactive period.

14. The base station according to claim 13, wherein: The cell DRX of the first cell and the cell DRX of a second cell different from the first cell are independently indicated.

15. The base station according to claim 13, wherein: The first signal includes radio resource control (RRC) signaling for configuring the cell DRX or downlink control information (DCI) for indicating the cell DRX.

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