Method and device for determining uplink transmission power in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. The present disclosure relates to operation of a terminal and a base station in a wireless communication system and, specifically, to a method for transmitting and receiving an uplink reference signal in a wireless communication system, and a device capable of performing same. The present disclosure provides a device and a method capable of effectively providing services in a mobile communication system.

Description

Method and device for determining uplink transmission power in a wireless communication system

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method for determining transmission power for transmission on an uplink channel of a terminal and a device capable of performing the method.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in the sub-6GHz frequency band such as 3.5 gigahertz (3.5GHz), but also in the ultra-high frequency band called millimeter wave (mmWave) such as 28GHz and 39GHz ('Above 6GHz'). In addition, for 6G mobile communication technology, which is called the system after 5G communication (Beyond 5G), implementation in the terahertz band (for example, the 3 terahertz (3THz) band at 95GHz) is being considered to achieve a transmission speed that is 50 times faster than 5G mobile communication technology and an ultra-low latency time that is reduced to one-tenth.

[0003] In the early stages of 5G mobile communication technology, the goal is to support services and satisfy performance requirements for enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC). These include beamforming and massive MIMO to mitigate path loss of radio waves in ultra-high frequency bands and increase the transmission distance of radio waves, support for various numerologies (such as operation of multiple subcarrier intervals) and dynamic operation of slot formats for efficient use of ultra-high frequency resources, initial access technology to support multi-beam transmission and wideband, definition and operation of BWP (Bidth Part), new channel coding methods such as LDPC (Low Density Parity Check) codes for large-capacity data transmission and Polar Code for reliable transmission of control information, and L2 pre-processing (L2). Standardization has been made for network slicing, which provides dedicated networks specialized for specific services, and pre-processing.

[0004] Currently, discussions are underway to improve and enhance the initial 5G mobile communication technology in consideration of the services that 5G mobile communication technology was intended to support, and physical layer standardization is in progress for technologies such as V2X (Vehicle-to-Everything) to help autonomous vehicles make driving decisions and increase user convenience based on their own location and status information transmitted by vehicles, NR-U (New Radio Unlicensed) for the purpose of system operation that complies with various regulatory requirements in unlicensed bands, NR terminal low power consumption technology (UE Power Saving), Non-Terrestrial Network (NTN), which is direct terminal-satellite communication to secure coverage in areas where communication with terrestrial networks is impossible, and Positioning.

[0005] In addition, standardization of wireless interface architecture / protocols is in progress for technologies such as intelligent factories (Industrial Internet of Things, IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) that provides nodes for expanding network service areas by integrating wireless backhaul links and access links, Mobility Enhancement technology including Conditional Handover and Dual Active Protocol Stack (DAPS) handover, and 2-step random access (2-step RACH for NR) that simplifies random access procedures. Standardization is also in progress for system architecture / services such as 5G baseline architecture (e.g., Service-based Architecture, Service-based Interface) for grafting Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) that provides services based on the location of the terminal.

[0006] Once these 5G mobile communication systems are commercialized, an explosive increase in connected devices will be connected to the communication network, necessitating enhanced functionality and performance of 5G mobile communication systems and integrated operation of these connected devices. To this end, new research will be conducted on improving 5G performance and reducing complexity, supporting AI services, supporting metaverse services, and drone communications by utilizing eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] In addition, the development of these 5G mobile communication systems includes new waveforms to ensure coverage in the terahertz band of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), Array Antenna, and Large Scale Antenna, metamaterial-based lenses and antennas to improve the coverage of terahertz band signals, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), Reconfigurable Intelligent Surface (RIS) technology, as well as full duplex technology to improve the frequency efficiency and system network of 6G mobile communication technology, satellite, AI (Artificial Intelligence) from the design stage and AI-based communication technology that realizes system optimization by internalizing end-to-end AI support functions, and ultra-high-performance communication and computing resources to provide services with complexity that exceeds the limits of terminal computing capabilities. It can serve as a basis for the development of next-generation distributed computing technologies that can be realized by utilizing them.

[0008] Embodiments of the present disclosure may have as a first purpose a device and method capable of effectively providing a service in a mobile communication system.

[0009] The present disclosure relates to a method performed by a terminal of a wireless communication system, which may include the steps of transmitting first information related to a control capability of a transmission power of the terminal to a base station, receiving second information for indicating a PC (power class) from the base station, and transmitting uplink data based on the transmission power corresponding to the indicated PC to the base station.

[0010] The present disclosure provides a method performed by a base station of a wireless communication system, which may include the steps of: receiving first information related to a control capability of a transmission power of a terminal from a terminal; determining a PC (power class) based on the first information; transmitting second information for indicating the determined PC to the terminal; and receiving uplink data from the terminal.

[0011] Embodiments of the present disclosure can provide a device and method capable of effectively providing a service in a mobile communication system.

[0012] FIG. 1 illustrates a MAC CE structure including single PHR information according to one embodiment of the present disclosure.

[0013] FIG. 2 illustrates a MAC CE structure including a plurality of PHR information according to one embodiment of the present disclosure.

[0014] FIG. 3 illustrates an SRS antenna switching operation according to an embodiment of the present disclosure.

[0015] FIG. 4 illustrates an example of SRS carrier switching according to one embodiment of the present disclosure.

[0016] FIGS. 5a, 5b, 5c and 5d illustrate examples of a case where a terminal including multiple PAs supports multiple CCs according to an embodiment of the present disclosure.

[0017] FIG. 6 illustrates an example of a MAC CE format for indicating a power class change according to one embodiment of the present disclosure.

[0018] FIG. 7 illustrates the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0019] FIG. 8 illustrates the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0020] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0021] In describing the embodiments, descriptions of technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure will be omitted. This is to avoid obscuring the gist of the present disclosure by omitting unnecessary explanations and to convey the gist more clearly.

[0022] For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted. Furthermore, the dimensions of each component do not entirely reflect its actual size. Identical or corresponding components in each drawing are assigned the same reference numbers.

[0023] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below and may be implemented in various different forms. These embodiments are provided only to ensure that the disclosure of the present disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Like reference numerals designate like elements throughout the specification. In addition, when describing the present disclosure, if a specific description of a related function or configuration is determined to unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of the functions of the present disclosure, and these may vary depending on the intention or custom of the user or operator. Therefore, their definitions should be made based on the contents throughout the specification.

[0024] Hereinafter, the base station is an entity that performs resource allocation of the terminal, and may be at least one of a gNode B, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. In the present disclosure, downlink (DL) refers to a wireless transmission path of a signal transmitted from a base station to a terminal, and uplink (UL) refers to a wireless transmission path of a signal transmitted from a terminal to a base station. In addition, although the LTE or LTE-A system may be described below as an example, the embodiments of the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, the 5th generation mobile communication technology (5G, new radio, NR) developed after LTE-A may be included here, and the 5G below may also be a concept that includes existing LTE, LTE-A, and other similar services. In addition, the present disclosure may be applied to other communication systems through some modifications within a scope that does not significantly deviate from the scope of the present disclosure, as judged by a person having skilled technical knowledge.

[0025] At this time, it will be understood that each block of the processing flowchart drawings and combinations of the flowchart drawings can be performed by computer program instructions. These computer program instructions can be installed in a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, so that the instructions executed by the processor of the computer or other programmable data processing equipment create a means for performing the functions described in the flowchart block(s). These computer program instructions can also be stored in a computer-available or computer-readable memory that can direct a computer or other programmable data processing equipment to implement the functions in a specific manner, so that the instructions stored in the computer-available or computer-readable memory can also produce a manufactured item that includes an instruction means for performing the functions described in the flowchart block(s). Since the computer program instructions may be installed on a computer or other programmable data processing device, a series of operational steps may be performed on the computer or other programmable data processing device to create a computer-executable process, and the instructions that cause the computer or other programmable data processing device to perform the steps for performing the functions described in the flowchart block(s) may also provide steps for performing the functions described in the flowchart block(s).

[0026] Additionally, each block may represent a module, segment, or portion of code that contains one or more executable instructions for performing a specific logical function(s). It should also be noted that in some alternative implementation examples, the functions described in the blocks may occur out of order. For example, two blocks depicted in succession may actually be executed substantially concurrently, or the blocks may sometimes be executed in reverse order, depending on their respective functions.

[0027] Here, the term '~ part' used in this embodiment means software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the '~ part' performs certain roles. However, the '~ part' is not limited to software or hardware. The '~ part' may be configured to be on an addressable storage medium or may be configured to play one or more processors. Therefore, as an example, the '~ part' includes components such as software components, object-oriented software components, class components, and task components, processes, functions, properties, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and '~ parts' may be combined into a smaller number of components and '~ parts' or further separated into additional components and '~ parts'. Additionally, the components and '~parts' may be implemented to activate one or more CPUs within a device or secure multimedia card. In addition, in an embodiment, the '~parts' may include one or more processors.

[0028] Wireless communication systems are evolving from providing voice-oriented services in the early days to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as communication standards such as 3GPP's HSPA (High Speed ​​Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e.

[0029] As a representative example of a broadband wireless communication system, the LTE system adopts the OFDM (Orthogonal Frequency Division Multiplexing) method in the downlink (DL) and the SC-FDMA (Single Carrier Frequency Division Multiple Access) method in the uplink (UL). The uplink refers to a wireless link in which a terminal (User Equipment (UE) or Mobile Station (MS)) transmits data or control signals to a base station (eNode B or base station (BS)), and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. The above multiple access method can distinguish the data or control information of each user by allocating and operating the time-frequency resources for transmitting data or control information to each user so that they do not overlap, that is, so that orthogonality is achieved.

[0030] As a future communications system beyond LTE, 5G communication systems must be able to freely reflect the diverse needs of users and service providers. Therefore, they must support services that simultaneously satisfy these diverse requirements. Services being considered for 5G communication systems include enhanced Mobile Broadband (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliability Low Latency Communication (URLLC).

[0031] eMBB aims to provide data transmission rates that are significantly higher than those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to support a peak data rate of 20 Gbps in the downlink and a peak data rate of 10 Gbps in the uplink from the perspective of a single base station. Furthermore, 5G communication systems must simultaneously provide the peak data rate and an increased user-perceived data rate for terminals. To meet these requirements, improvements in various transmission and reception technologies, including improved multi-input, multi-output (MIMO) transmission technology, are required. Furthermore, while LTE transmits signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission rates required by 5G communication systems by using a wider frequency bandwidth than 20 MHz in the 3-6 GHz or higher 6 GHz band.

[0032] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide the IoT, mMTC requires supporting large-scale terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. The IoT requires the ability to support a large number of terminals (e.g., 1,000,000 terminals / km2) within a cell, as it provides communication capabilities through the attachment of various sensors and devices. Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in shadow areas, such as basements, beyond cell coverage. This may require broader coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must be inexpensive, and since frequent battery replacement is unlikely, they may require extremely long battery lifespans, such as 10 to 15 years.

[0033] Finally, URLLC refers to a cellular-based wireless communication service used for a specific purpose (mission-critical). For example, services such as remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, and emergency alerts can be considered. Therefore, the communication provided by URLLC must provide very low latency and very high reliability. For example, a service supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and, at the same time, must have a 10 -5The following packet error rate (PER) requirements apply. Therefore, for services supporting URLLC, 5G systems must provide a smaller Transmit Time Interval (TTI) than other services. Simultaneously, design considerations may require the allocation of extensive resources in the frequency band to ensure communication link reliability.

[0034] The three 5G services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. To meet the differing requirements of each service, different transmission and reception techniques and parameters can be used. Of course, 5G is not limited to the three services described above.

[0035] Hereinafter, a / b can be understood as at least one of a or b.

[0036] [Uplink: PUSCH]

[0037] [PUSCH: Transmission Method Related]

[0038] Below, the scheduling method for PUSCH (physical uplink shared channel) transmission is described. PUSCH transmission can be dynamically scheduled by the UL grant in DCI (downlink control information) or can operate by configured grant Type 1 or Type 2. Dynamic scheduling instructions for PUSCH transmission are possible in DCI format 0_0 or 0_1.

[0039] Configured grant Type 1 PUSCH transmission can be semi-statically configured by receiving configuredGrantConfig containing rrc-ConfiguredUplinkGrant of [Table 1] through higher-order signaling, without receiving UL grant in DCI. Configured grant Type 2 PUSCH transmission can be semi-persistently scheduled by UL grant in DCI after receiving configuredGrantConfig not containing rrc-ConfiguredUplinkGrant of [Table 1] through higher-order signaling. When PUSCH transmission operates by configured grant, parameters applied to PUSCH transmission can be applied through configuredGrantConfig of higher-order signaling of [Table 1], except dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, scaling of UCI-OnPUSCH provided by pusch-Config of [Table 2]. If the terminal has been provided with transformPrecoder in configuredGrantConfig, which is the upper signaling of [Table 1], the terminal can apply tp-pi2BPSK in pusch-Config of [Table 2] to PUSCH transmission operated by configured grant.

[0040]

[0041] Next, the PUSCH transmission method is described. The DMRS (demodulation reference signal) antenna port for PUSCH transmission is the same as the antenna port for SRS (sounding reference signal) transmission. PUSCH transmission can follow a codebook-based transmission method or a non-codebook-based transmission method, respectively, depending on whether the value of txConfig in the pusch-Config of the upper signaling [Table 2] is 'codebook' or 'nonCodebook'.

[0042] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured by configured grant. If the UE is instructed to schedule PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission using pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource corresponding to the minimum ID within the activated uplink bandwidth part (BWP) within the serving cell, and the PUSCH transmission is based on a single antenna port. The UE does not expect scheduling for PUSCH transmission via DCI format 0_0 within a BWP where a PUCCH resource including pucch-spatialRelationInfo is not configured. If the UE does not configure txConfig in pusch-Config of [Table 2], the UE does not expect to be scheduled with DCI format 0_1.

[0043]

[0044] Next, we describe codebook-based PUSCH transmission. Codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. When codebook-based PUSCH is dynamically scheduled via DCI format 0_1 ​​or semi-statically configured via a configured grant, the UE can determine a precoder for PUSCH transmission based on the SRS Resource Indicator (SRI), the Transmission Precoding Matrix Indicator (TPMI), and the transmission rank (the number of PUSCH transmission layers).

[0045] At this time, the SRI can be given through the SRS resource indicator field in the DCI or configured through the srs-ResourceIndicator higher-level signaling. The UE is configured with at least one SRS resource when transmitting a codebook-based PUSCH, and can be configured with up to two. When the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. In addition, the TPMI and transmission rank can be given through the precoding information and number of layers fields in the DCI or configured through the precodingAndNumberOfLayers higher-level signaling. The TPMI is used to indicate the precoder applied to the PUSCH transmission. If the UE is configured with one SRS resource, the TPMI is used to indicate the precoder to be applied to the configured one SRS resource. When a terminal is configured with multiple SRS resources, TPMI is used to indicate the precoder to be applied in the SRS resource indicated through SRI.

[0046] The precoder to be used for PUSCH transmission is selected from an uplink codebook having the same number of antenna ports as the nrofSRS-Ports value in the upper layer signaling, SRS-Config. In codebook-based PUSCH transmission, the UE determines the codebook subset based on the TPMI and codebookSubset in the upper layer signaling, pusch-Config. The codebookSubset in the upper layer signaling, pusch-Config, can be set to one of 'fullyAndPartialAndNonCoherent', 'partialAndNonCoherent', or 'nonCoherent' based on the UE capability reported by the UE to the base station. If the UE reported 'partialAndNonCoherent' as the UE capability, the UE does not expect the value of codebookSubset in the upper layer signaling to be set to 'fullyAndPartialAndNonCoherent'. Additionally, if the UE reports 'nonCoherent' as the UE capability, the UE does not expect the value of the upper signaling codebookSubset to be set to 'fullyAndPartialAndNonCoherent' or 'partialAndNonCoherent'. If nrofSRS-Ports in the upper signaling SRS-ResourceSet points to two SRS antenna ports, the UE does not expect the value of the upper signaling codebookSubset to be set to 'partialAndNonCoherent'.

[0047] A terminal can be configured with one SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', and one SRS resource within the SRS resource set can be indicated via SRI. If multiple SRS resources are configured in an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'codebook', the terminal can expect that the value of nrofSRS-Ports in the upper signaling SRS-Resource is set to the same value for all SRS resources.

[0048] The terminal transmits to the base station one or more SRS resources included in the SRS resource set in which the usage value is set to 'codebook' according to upper signaling, and the base station selects one of the SRS resources transmitted by the terminal and instructs the terminal to perform PUSCH transmission using transmission beam information of the corresponding SRS resource. At this time, in codebook-based PUSCH transmission, the SRI is used as information for selecting an index of one SRS resource and is included in the DCI. Additionally, the base station includes in the DCI information indicating the TPMI and rank to be used by the terminal for PUSCH transmission. The terminal can perform PUSCH transmission by applying the indicated rank and the precoder indicated by the TPMI based on the transmission beam of the corresponding SRS resource using the SRS resource indicated by the SRI.

[0049] Next, we describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can operate semi-statically based on a configured grant. If at least one SRS resource is configured within an SRS resource set in which the usage value in the upper signaling, SRS-ResourceSet, is set to 'nonCodebook', the UE can be scheduled for non-codebook-based PUSCH transmission via DCI format 0_1.

[0050] For an SRS resource set in which the usage value in the upper signaling SRS-ResourceSet is set to 'nonCodebook', the UE can be configured with one connected NZP CSI-RS resource (non-zero power CSI-RS). The UE can perform calculations for a 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 at the UE is less than 42 symbols, the UE does not expect information about the precoder for SRS transmission to be updated.

[0051] If the value of resourceType in the upper signaling SRS-ResourceSet is set to 'aperiodic', the connected NZP CSI-RS is indicated by the SRS request field in DCI format 0_1 ​​or 1_1. At this time, if the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, the presence of the connected NZP CSI-RS is indicated when the value of the SRS request field in DCI format 0_1 ​​or 1_1 is not '00'. At this time, the DCI must not indicate cross-carrier or cross BWP scheduling. In addition, if the value of the SRS request indicates the presence of an NZP CSI-RS, the NZP CSI-RS is located in the slot in which the PDCCH (physical downlink control channel) including the SRS request field is transmitted. At this time, the TCI states set for the scheduled subcarriers are not set to QCL-TypeD.

[0052] If a periodic or semi-persistent SRS resource set is configured, the associated NZP CSI-RS can be indicated through the associatedCSI-RS within the upper-level signaling SRS-ResourceSet. For non-codebook-based transmission, the UE does not expect the upper-level signaling spatialRelationInfo for the SRS resource and the associatedCSI-RS within the upper-level signaling SRS-ResourceSet to be configured together.

[0053] When multiple SRS resources are configured, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. At this time, the SRI can be indicated through the SRS resource indicator field in the DCI or can be set through the srs-ResourceIndicator, which is a higher-level signaling. Similar to the codebook-based PUSCH transmission described above, when the UE receives an SRI through the DCI, the SRS resource indicated by the SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH containing the SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be simultaneously transmitted in the same symbol within one SRS resource set and the maximum number of SRS resources are determined by the UE capability reported by the UE to the base station. At this time, the SRS resources that the UE simultaneously transmits occupy the same RB. The UE configures one SRS port for each SRS resource. Only one SRS resource set with the usage value set to 'nonCodebook' in the upper signaling SRS-ResourceSet can be set, and up to four SRS resources for non-codebook based PUSCH transmission can be set.

[0054] The base station transmits one NZP-CSI-RS associated with an SRS resource set to the terminal, and the terminal calculates a precoder to be used when transmitting one or more SRS resources within the SRS resource set based on the result measured upon reception of the NZP-CSI-RS. When the terminal transmits one or more SRS resources within the SRS resource set with usage set to 'nonCodebook' to the base station, the terminal applies the calculated precoder, and the base station selects one or more SRS resources from the received one or more SRS resources. At this time, in non-codebook based PUSCH transmission, the SRI represents an index that can express a combination of one or more SRS resources, and the SRI is included in the DCI. At this time, 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 terminal can transmit the PUSCH by applying the precoder applied to SRS resource transmission to each layer.

[0055] [PUSCH: Transmission Power Related]

[0056] As an example of the present disclosure, when uplink data is transmitted through an uplink data channel (PUSCH; Physical Uplink Shared Channel) in response to a power control command received from a base station, a method for transmitting by setting the transmission power of the uplink data channel by a terminal is described. The uplink data channel transmission power of the terminal can be determined as shown in [Mathematical Formula 1] below, expressed in units of dBm, together with the i-th transmission unit, the parameter set configuration index j, and the PUSCH power control adjustment state corresponding to the closed loop index l. In [Mathematical Formula 1] below, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be set for each cell c, each carrier frequency f, and each bandwidth part b, and can be distinguished by indices b, f, and c.

[0057]

[0058] : The maximum transmission power available to the terminal in the i-th transmission unit, which can be determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

[0059] : Is and It consists of the sum of .

[0060] is set to cell-specific upper layer signaling to the terminal, is a value set by terminal-specific upper layer signaling. Here, when j=0, it means PUSCH for transmitting msg3, when j=1, it means configured grant PUSCH, and if j={2, …,J-1} is one of the values, it can indicate grant PUSCH.

[0061] : Indicates the subcarrier spacing configuration value.

[0062] : It can indicate the amount of resources used in the i-th PUSCH transmission unit (e.g., the number of Resource Blocks (RBs) used for PUSCH transmission in the frequency axis).

[0063] This represents a value that can be determined (in the case of dynamic grant PUSCH) through upper layer settings and SRI (SRS Resource Indicator) as a value to compensate for path loss.

[0064] : It represents the path loss between the base station and the terminal, and the terminal uses the reference signal (RS) resource signaled by the base station. Path loss can be calculated from the difference between the transmission power and the terminal reception signal level of the reference signal. The reference signal index is It refers to the downlink path loss estimate estimated by the terminal through the reference signal and the reference signal index. The UE can decide this via upper layer configuration and SRI (in case of dynamic grant PUSCH or configured grant PUSCH based on ConfiguredGrantConfig that does not include upper layer configuration rrc-ConfiguredUplinkGrant (type 2 configured grant PUSCH)) or via upper layer configuration.

[0065] : It refers to a value determined according to the MCS (Modulation Coding Scheme) and the format of information transmitted via PUSCH (TF: transport format, e.g., whether UL-SCH is included or CSI is included, etc.).

[0066] : Refers to a value for a closed loop index that can be determined by a higher layer setting and SRI for PUSCH as a closed loop power control adjustment value. Here, the closed loop power adjustment for PUSCH transmission can be supported by dividing into an accumulation method that accumulates and applies a value indicated by a TPC command and an absolute method that directly applies the value indicated by the TPC command, and this can be determined depending on whether the higher layer parameter tpc-Accumulation is set. If the higher layer parameter tpc-Accumulation is set to disabled, the terminal can perform closed loop power adjustment for PUSCH transmission using the absolute method, and if tpc-Accumulation is not set, the terminal can perform closed loop power adjustment for PUSCH transmission using the accumulation method.

[0067] PUSCH power control adjustment status can be determined through the bandwidth part b, carrier frequency f, cell c, i-th transmission unit, and closed loop index l.

[0068] - : A value indicated by a TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c, or a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI.

[0069] -- If the terminal has received the upper layer signaling twoPUSCH-PC-AdjustmentStates, the closed loop index l can have a value of 0 or 1.

[0070] -- If the terminal has not received the upper layer signaling twoPUSCH-PC-AdjustmentStates or has been scheduled for PUSCH transmission based on RAR UL grant, the closed loop index l may have a value of 0.

[0071] --- If the terminal has set ConfiguredGrantConfig, which is a higher layer signaling, and performs PUSCH transmission or retransmission, the closed loop index l may follow the powerControlLoopToUse value, which is a higher layer signaling.

[0072] --- If the terminal has been configured with the upper layer signaling SRI-PUSCH-PowerControl, the terminal can obtain a connection relationship between the value indicated by the SRI (SRS resource indicator) field in the DCI format that schedules PUSCH transmission and the closed loop index l configured through the upper layer signaling sri-PUSCH-ClosedLoopIndex, and can determine the closed loop index l based on the value indicated by the SRI field in the DCI format based on the corresponding connection relationship.

[0073] --- If the terminal is scheduled for PUSCH transmission based on a DCI format that does not include the SRI field, or if the upper layer signaling SRI-PUSCH-PowerControl is not configured, the terminal may consider the closed loop index l to be 0.

[0074] --- If the terminal is indicated with a TPC command value through a TPC command field included in DCI format 2_2 transmitted with a CRC scrambled with TPC-PUSCH-RNTI, the closed loop index l can be indicated through the closed loop index field included in DCI format 2_2.

[0075] -- If the terminal has not been configured with the upper layer signaling tpc-Accumulation, i.e., if the TPC command accumulation operation is possible for the terminal, the PUSCH power control adjustment state for the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c. can be calculated by [Mathematical Formula 2].

[0076]

[0077] -- is a value indicated by a TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the m-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c, or may be a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI. If TPC command accumulation operation is possible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 3] below. For example, if the value of the TPC command field is 0, can have a value of -1 dB.

[0078] -- is a specific set of TPC command values For all transmission units corresponding to mine can mean the sum of . At this time is a set It can mean the number of all elements belonging to me. may mean a set of DCIs including all TPC command values ​​for which a TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. To determine the start and end points in the time dimension, all DCIs received by the terminal within the two points are defined. can be included as an element of .

[0079] --- The end point for determining is from the start symbol of the i-th PUSCH transmission unit. It could be as far back as the symbol.

[0080] --- The starting point for deciding is From the start symbol of the th PUSCH transmission unit It can be a point as far back as the symbol. In this case, a positive integer is above The end point for determining (from the start symbol of the i-th PUSCH transmission unit) (as much as the previous point) than the symbol, From the start symbol of the th PUSCH transmission unit It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by a symbol.

[0081] --- For example, The end point for determining can be defined as sym(i), From the start symbol of the th PUSCH transmission unit The time point before the symbol is sym( ), if sym(i) = sym(i-1) > sym(i- 2) > sym(i-3) holds, then i0 can be determined as 2.

[0082] - If the terminal has been set to the upper layer signaling tpc-Accumulation, i.e., if the TPC command accumulation operation is not possible for the terminal, the PUSCH power control adjustment state for the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c. can be calculated by [Mathematical Formula 3].

[0083]

[0084] -- is a value indicated by a TPC command field included in DCI format 0_0, 0_1, or 0_2 that schedules the i-th PUSCH transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c, or may be a value indicated by a TPC command field included in DCI format 2_2 transmitted together with a CRC scrambled with TPC-PUSCH-RNTI. If the TPC command accumulation operation is not possible, The value may have a corresponding value in [dB] units depending on which value the TPC command field included in the DCI format 0_0, 0_1, 0_2, or 2_2 is indicated as in [Table 3] below. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0085]

[0086] [PUSCH: TPMI Related]

[0087] Next, we describe the TPMI (Transmit Precoding Matrix Indicator) indicated by the base station through DCI during codebook-based PUSCH transmission.

[0088] If the terminal is scheduled for 1-layer transmission using a single PUSCH antenna port by being configured by the base station through DCI or higher layer signaling, the TPMI can be defined as W=1. Otherwise, that is, if the terminal is scheduled for 1-layer or higher PUSCH transmission using multiple PUSCH antenna ports by being configured by the base station through DCI or higher layer signaling, the TPMI W can be defined by [Table 4] to [Table 10] below.

[0089]

[0090] [Table 4] shows the TPMI for a 1-layer case where a terminal has two PUSCH antenna ports. In [Table 4], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal to select one of TPMI indexes 0 and 1. If the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal to select one of TPMI indexes 0 to 5.

[0091]

[0092] [Table 5] shows the TPMI for a 1-layer terminal having four PUSCH antenna ports and using transform precoding (i.e., using DFTS-OFDM waveform). In [Table 5], if the terminal has a non-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 3, if the terminal has a partial-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 11, and if the terminal has a full-coherent antenna structure and has reported the corresponding terminal capability to the base station, the base station can select and instruct the terminal by one of TPMI indices 0 to 27.

[0093]

[0094] [Table 6] shows the TPMI for a 1-layer UE with 4 PUSCH antenna ports, without transform precoding (i.e., using CP-OFDM waveforms). In [Table 6], if the UE has a non-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 3. If the UE has a partial-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 11. If the UE has a full-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 27.

[0095]

[0096] [Table 7] shows the TPMI for a 2-layer UE with two PUSCH antenna ports and no transform precoding (i.e., CP-OFDM waveforms). In [Table 7], if the UE has a non-coherent antenna structure and has reported the corresponding UE capabilities to the base station, the base station can select and instruct the UE to select TPMI index 0. If the UE has a full-coherent antenna structure and has reported the corresponding UE capabilities to the base station, the base station can select and instruct the UE to select one of TPMI indices 0 to 2.

[0097]

[0098] [Table 8] shows the TPMI for a 2-layer UE with 4 PUSCH antenna ports and no transform precoding (i.e., CP-OFDM waveform is used). In [Table 8], if the UE has a non-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 5. If the UE has a partial-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 13. If the UE has a full-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station can select and instruct the UE by one of TPMI indices 0 to 21.

[0099]

[0100] [Table 9] shows the TPMI for a 3-layer UE with 4 PUSCH antenna ports and no transform precoding (i.e., CP-OFDM waveform is used). In [Table 9], if the UE has a non-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with TPMI index 0. If the UE has a partial-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with one of TPMI indexes 0 to 2. If the UE has a full-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with one of TPMI indexes 0 to 6.

[0101]

[0102] [Table 10] shows the TPMI for a 4-layer UE with 4 PUSCH antenna ports and no transform precoding (i.e., CP-OFDM waveform is used). In [Table 10], if the UE has a non-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with TPMI index 0. If the UE has a partial-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with one of TPMI indexes 0 to 2. If the UE has a full-coherent antenna structure and has reported the corresponding UE capability to the base station, the base station may select and instruct the UE with one of TPMI indexes 0 to 4.

[0103] [PHR related]

[0104] Power headroom reporting refers to the difference between the nominal UE maximum transmit power and the estimated power for uplink transmission (i.e., representing the available transmit power of the UE) measured by the UE and transmitted to the base station. Power headroom reporting can be used to support power-aware packet scheduling. The estimated power for uplink transmission can be the estimated power for UL-SCH (PUSCH) transmission per activated serving cell, the estimated power for UL-SCH and PUCCH transmissions in SpCells of other MAC entities (e.g., the E-UTRA MAC entity in EN-DC, NE-DC, and NGEN-DC cases in the 3GPP standard), the estimated power for SRS transmissions per activated serving cell, etc. The UE can trigger a power headroom report if any of the following trigger events are met:

[0105] - [Trigger Event 1] When the upper layer parameter phr-ProhibitTimer expires and the MAC entity has uplink resources for a new transmission, the path loss for at least one activated serving cell changes by more than the upper layer parameter phr-Tx-PowerFactorChange dB since the most recent PHR transmission, where the activated downlink bandwidth part for at least one activated serving cell is not a dormant bandwidth part. In this case, the path loss change for a cell is determined as the difference between the currently measured path loss with respect to the current path loss reference and the path loss measured at that point in time with respect to the path loss reference at the time of the most recent PHR transmission.

[0106] - [Trigger Event 2] Upper layer parameter phr-PeriodicTimer expired.

[0107] - [Trigger Event 3] Power headroom reporting is enabled or disabled by a higher layer, rather than by a setting or reset that disables power headroom reporting.

[0108] - [Trigger Event 4] SCell is activated for any MAC entity whose uplink is not configured with dormant bandwidth part as firstActiveDownlinkBWP-Id. firstActiveDownlinkBWP-Id is the identifier of the DL BWP to be activated when performing RRC (re)configuration (if configured for the SpCell) or the identifier of the DL BWP to be used when activating the SCell (if configured for the SCell).

[0109] - [Trigger Event 5] PSCell is added (i.e., a new PSCell is added or changed).

[0110] - [Trigger Event 6] The upper layer parameter phr-PrhoibitTimer has expired and all of the following conditions a) and b) are met for any activated supporting cells of any MAC entity with uplink configured when the MAC entity has uplink resources for a new transmission:

[0111] a) There are uplink resources allocated for transmission or PUCCH is transmitted to the corresponding cell.

[0112] b) When the MAC entity has uplink resources for transmission or transmits PUCCH to the corresponding cell, the required power backoff due to power management for the corresponding cell is greater than the upper layer parameter phr-Tx-PowerFactorChange dB since the most recent PHR transmission.

[0113] - [Trigger Event 7] Change the activated bandwidth part of SCell for any MAC entity with configured uplink from dormant bandwidth part to non-dormant downlink bandwidth part.

[0114] - [Trigger Event 8] When the higher layer parameter mpe-Reporting-FR2 is set in the UE to indicate whether to report MPE P-MPR (Maximum allowed UE output power reduction) to satisfy the maximum permissible exposure (MPE) in FR2, and mpe-ProhibitTimer is not running, if the power headroom report is referred to as 'MPE P-MPR report', the measured P-MPR applied to satisfy the FR2 MPE requirement for at least one activated FR2 capable cell since the most recent power headroom report is greater than or equal to the higher layer parameter mpe-Threshold.

[0115] Power headroom reporting may be triggered based on trigger events, and the terminal may decide to report power headroom based on the following additional conditions:

[0116] - Additional conditions due to temporary required power backoff: When the required power backoff is temporarily reduced (i.e., up to tens of milliseconds) for power management reasons, the MAC entity shall not trigger power headroom reporting. When the required power backoff is temporarily reduced and power headroom reporting is triggered by another trigger event, this results in P representing the ratio between the maximum power and the remaining (available) power. CMAX,f,c / PH value should not be temporarily reduced, i.e., PHR should not be triggered due to temporary power backoff. For example, if PHR is triggered by another PHR trigger event (such as the expiration of a periodic timer), a condition can be added so that PH reflecting the temporary power reduction due to the demand power backoff is not reported, but PH excluding the effect of the demand power backoff is reported.

[0117] - Power headroom reporting conditions according to terminal implementation: If one HARQ process is set to cg-RetransmissionTimer and a power headroom report has already been included in the MAC PDU for transmission by the corresponding HARQ process, but transmission through the lower layer has not yet been performed, the terminal implementation may determine how the corresponding power headroom report is processed.

[0118] If one or more of the trigger events occur to trigger a power headroom report, and the uplink transmission resources allocated through the downlink control information can accommodate the MAC entity and the subheader for the power headroom report, the terminal performs the power headroom report through the corresponding uplink resources. In this case, the corresponding uplink resources refer to resources for uplink transmission scheduled by the first downlink control information format (DCI format) that schedules the initial transmission of a transport block (TB) after the power headroom trigger or by the first uplink grant. That is, after the power headroom trigger occurs, the terminal can perform the power headroom report through the uplink transmission scheduled by the first downlink control information format or the first uplink grant among the uplink resources that can accommodate the MAC entity and the subheader for the power headroom. Alternatively, after a power headroom trigger occurs, the terminal can perform power headroom reporting through a configured grant PUSCH transmission capable of accommodating a MAC entity for power headroom and its subheader.

[0119] When reporting power headroom for a specific cell, a UE can calculate and report one of two types of power headroom information. The first type is actual PHR, which is power headroom information calculated based on the transmit power of an uplink signal (e.g., PUSCH) actually transmitted. The second type is virtual PHR (or reference format), which is power headroom information calculated based on transmit power parameters set in a higher layer, even though there is no actual uplink signal (e.g., PUSCH) transmitted. After a power headroom report is triggered, the UE can calculate the actual PHR based on the downlink control information received up to the time including the PDCCH monitoring interval in which the first DCI format scheduling the PUSCH to transmit the MAC CE including the power headroom report, as described above, and the higher layer information for periodic / semi-persistent SRS transmission and configured grant transmission. If the UE receives downlink control information or decides to transmit periodic / semi-persistent SRS or configured grant after the PDCCH monitoring period in which the first DCI format is received, the UE can calculate virtual PHR for the corresponding cell. Alternatively, after the power headroom report is triggered, the UE calculates T' corresponding to the PUSCH preparation process time described above based on the first uplink symbol of the configured grant PUSCH that can transmit the power headroom information. proc,2 =T proc,2The actual PHR can be calculated based on the downlink control information received up to the previous point in time and the upper layer information for periodic / semi-persistent SRS transmission and configured grant transmission. If T' is based on the first uplink symbol of the configured grant PUSCH, proc,2 If the terminal receives downlink control information after the previous point in time, or decides to transmit periodic / semi-persistent SRS or configured grant, the terminal can calculate a virtual PHR for the corresponding cell.

[0120] If the terminal calculates the actual PHR based on the actual PUSCH transmission, the power headroom reporting information for the support cell c, carrier f, bandwidth part b, and PUSCH transmission time point i can be expressed as in the following [Mathematical Formula 4].

[0121]

[0122] As another example, if a terminal calculates a virtual PHR based on a transmission power parameter set in a higher layer, the power headroom reporting information for support cell c, carrier f, bandwidth part b, and PUSCH transmission time point i can be expressed as in the following [Mathematical Formula 5].

[0123]

[0124] According to [Mathematical Equation 4], power headroom information can be calculated by using the difference in transmission power for PUSCH transmission occasion i at the maximum output power. According to [Mathematical Equation 5], parameters related to MPR (Maximum Power Reduction) (e.g., MPR, A-MPR (Additional MPR), P-MPR (Power Management MPR), etc.) T cThe maximum output power when assuming 0 is and default transmit power parameters (e.g., , p0 and alpha of P0-PUSCH-AlphaSetId=0, corresponding to pusch-PathlossReferenceRS-Id=0 And the power headroom information can be calculated using the difference in the reference PUSCH transmission power using the closed loop power adjustment value with the closed loop index l = 0). The description of each variable in [Equation 4] and [Equation 5] can refer to the description of the variable in [Equation 1] above. A-MPR is an MPR that satisfies the additional emission requirement indicated by the base station by the upper layer signaling (for example, by combining the additionalSpectrumEmission indicated by RRC and the NR freq. band (Table 6.2.3.1-1A in TS 38.101-1), the network signaling label is identified, and the A-MPR value accordingly is defined as Table 6.2.3.1-1 in TS 38.101-1). P-MPR is the maximum allowed UE output power reduction for serving cell c, and its purpose is an MPR that can satisfy applicable electromagnetic energy absorption requirements. A-MPR and P-MPR can refer to 3GPP standard TS 38.101-1 section 6.2. In a communication system to which the present disclosure can be applied, the first type of power headroom information may mean power headroom information for PUSCH transmission power, the second type of power headroom information may mean power headroom information for PUCCH transmission power, and the third type of power headroom information may mean power headroom information for SRS transmission power. Meanwhile, the present disclosure is not limited thereto.

[0125] FIG. 1 illustrates a MAC CE structure including single PHR information according to one embodiment of the present disclosure.

[0126] If MR-DC (multi-radio dual connectivity) or UL-CA (uplink carrier aggregation) is not supported, the base station sets the upper layer parameter 'multiplePHR' to 'false' for the corresponding terminal. This means that the terminal supports power headroom reporting for the PCell with a MAC CE having a single entry, as shown in (110) of FIG. 1. Each field of FIG. 1 can be defined as shown in [Table 11] below. However, this is merely an example and the present disclosure is not limited thereto.

[0127]

[0128] FIG. 2 illustrates a MAC CE structure including a plurality of PHR information according to one embodiment of the present disclosure.

[0129] When a terminal supports MR-DC (multi-RAT dual connectivity) or UL-CA (uplink carrier aggregation), the base station sets the upper layer parameter 'multiplePHR' to 'true' for the corresponding terminal to perform power headroom reporting for each supported cell. This means that the terminal supports power headroom reporting for multiple supported cells with a MAC CE having multiple entries, such as the first format (200) or the second format (202) illustrated in FIG. 2. The first format (200) of FIG. 2 is a PHR MAC CE format that can be used when multiple serving cells are configured and the largest index value among the serving cells is less than 8. The second format (202) of FIG. 2 is a PHR MAC CE format that can be used when multiple serving cells are configured and the largest index value among the serving cells is greater than or equal to 8. Unlike the PHR MAC CE format illustrated in FIG. 1, the first format (200) or the second format (202) illustrated in FIG. 2 may have a variable size depending on the set or number of serving cells configured. The information may include second type PH information for SpCells (special cells) of other MAC entities (e.g., LTE) and first type PH information for PCells. If the largest index value among the serving cells is less than 8, the field indicating the serving cell information may consist of one octet. If the largest index value among the serving cells is greater than or equal to 8, the field indicating the serving cell information may consist of four octets. Power headroom information may be included in the PHR MAC CE according to the order of the serving cell indexes. When power headroom reporting is triggered, the MAC entity may transmit the PHR MAC CE including the power headroom information through the transmittable PUSCH.At this time, whether the power headroom information is calculated based on actual transmission (i.e., actual PHR) or calculated based on transmission power parameters set in the upper layer (i.e., virtual PHR) is determined at a specific point in time (the point in time including the PDCCH monitoring period in which the first DCI format is detected or T' in the first symbol of the first PUSCH). proc,2 It can be determined based on the upper signal and downlink control information received up to the previous point in time. Meanwhile, the fields of the PHR MAC CE format illustrated in Fig. 2 may have the same meaning (definition) as most of the fields of the PHR MAC CE format illustrated in Fig. 1, and C i and V can have the same meaning as described in [Table 12] below.

[0130]

[0131] [Uplink: RS]

[0132] [SRS related]

[0133] Next, we describe an uplink channel estimation method using the Sounding Reference Signal (SRS) transmission of a terminal. The base station can configure at least one SRS configuration for each uplink BWP to convey configuration information for SRS transmission to the terminal, and can also configure at least one SRS resource set for each SRS configuration. For example, the base station and the terminal can exchange the following upper-level signaling information to convey information regarding the SRS resource set.

[0134] - srs-ResourceSetId: SRS resource set index

[0135] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0136] - resourceType: This is the time axis transmission setting of the SRS resource referenced in the SRS resource set, and can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information can be provided depending on the usage of the SRS resource set. If set to 'aperiodic', an aperiodic SRS resource trigger list and slot offset information can be provided, and associated CSI-RS information can be provided depending on the usage of the SRS resource set.

[0137] - usage: This is a setting for the usage of the SRS resource referenced in the SRS resource set, and can be set to one of 'beamManagement', 'codebook', 'nonCodebook', and 'antennaSwitching'.

[0138] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0139] The terminal can understand that the SRS resource included in the set of SRS resource indices referenced in the SRS resource set follows the information set in the SRS resource set.

[0140] In addition, the base station and the terminal can transmit and receive upper layer signaling information to convey individual configuration information for the SRS resource. For example, the individual configuration information for the SRS resource can include time-frequency axis mapping information within the slot of the SRS resource, which can include information about frequency hopping within or between slots of the SRS resource. In addition, the individual configuration information for the SRS resource can include the time axis transmission configuration of the SRS resource, which can be set to one of 'periodic', 'semi-persistent', and 'aperiodic'. This can be restricted to have the same time axis transmission configuration as the SRS resource set including the SRS resource. If the time axis transmission configuration of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) can additionally be included in the time axis transmission configuration.

[0141] The base station can activate, deactivate, or trigger SRS transmission to the UE through higher 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 to the UE through higher layer signaling. The base station can instruct the UE to activate an SRS resource set with resourceType set to periodic through higher layer signaling, and the UE can transmit an SRS resource referenced in the activated SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource, and the slot mapping, including the transmission period and slot offset, follows the periodicityAndOffset set in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information set in the SRS resource, or the associated CSI-RS information set in the SRS resource set that includes the SRS resource. A terminal can transmit SRS resources within an activated uplink BWP for periodic SRS resources activated through upper layer signaling.

[0142] For example, a base station can activate or deactivate semi-persistent SRS transmission to a terminal through upper layer signaling. The base station can instruct the terminal to activate an SRS resource set through MAC CE signaling, and the terminal can transmit an SRS resource referenced in the activated SRS resource set. The SRS resource set activated through MAC CE signaling can be limited to an SRS resource set with resourceType set to semi-persistent. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource, and the slot mapping including the transmission period and slot offset follows the periodicityAndOffset configured in the SRS resource. In addition, the spatial domain transmission filter applied to the transmitted SRS resource can refer to the spatial relation information configured in the SRS resource, or the associated CSI-RS information configured in the SRS resource set that includes the SRS resource. If spatial relation info is configured in an SRS resource, the spatial domain transmission filter can be determined by referring to the configuration information for spatial relation info transmitted through MAC CE signaling that activates semi-persistent SRS transmission without following it. The terminal can transmit SRS resources within the activated uplink BWP for the semi-persistent SRS resource activated through upper layer signaling.

[0143] For example, a base station can trigger aperiodic SRS transmission to a terminal via DCI. The base station can indicate one of the aperiodic SRS resource triggers (aperiodicSRS-ResourceTrigger) via the SRS request field of the DCI. The terminal can understand that an SRS resource set including the aperiodic SRS resource trigger indicated via DCI in the aperiodic SRS resource trigger list among the configuration information of the SRS resource set has been triggered. The terminal can transmit an SRS resource referenced in the triggered SRS resource set. The time-frequency domain resource mapping within the slot of the transmitted SRS resource follows the resource mapping information configured in the SRS resource. In addition, the slot mapping of the transmitted SRS resource can be determined through a slot offset between a PDCCH including the DCI and the SRS resource, which can refer to value(s) included in a slot offset set configured in the SRS resource set. Specifically, the slot offset between the PDCCH including DCI and the SRS resource may be applied with a value indicated in the time domain resource assignment field of the DCI among the offset value(s) included in the slot offset set configured in the SRS resource set. In addition, the spatial domain transmission filter applied to the transmitted SRS resource may refer to the spatial relation information configured in the SRS resource, or may refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The UE may transmit the SRS resource within the activated uplink BWP for the aperiodic SRS resource triggered through the DCI.

[0144] When a base station triggers aperiodic SRS transmission to a terminal through DCI, a minimum time interval may be required between a PDCCH including the DCI that triggers aperiodic SRS transmission and the SRS to be transmitted, so that the terminal can transmit the SRS by applying configuration information for the SRS resource. The time interval for SRS transmission of the terminal can be defined as the number of symbols between the last symbol of the PDCCH including the DCI that triggers aperiodic SRS transmission and the first symbol to which the first transmitted SRS resource among the SRS resource(s) is mapped. The minimum time interval can be determined with reference to the PUSCH preparation procedure time required for the terminal to prepare for PUSCH transmission. In addition, the minimum time interval can have different values ​​depending on the usage of the SRS resource set including the SRS resource to be transmitted. For example, the minimum time interval can be determined as N2 symbols, which are defined by considering the terminal processing ability according to the capability of the terminal with reference to the PUSCH preparation procedure time of the terminal. In addition, considering the usage of the SRS resource set including the SRS resource being transmitted, if the usage of the SRS resource set is set to 'codebook' or 'antennaSwitching', the minimum time interval can be set to N2 symbols, and if the usage of the SRS resource set is set to 'nonCodebook' or 'beamManagement', the minimum time interval can be set to N2+14 symbols.The terminal may transmit an aperiodic SRS if the time interval for aperiodic SRS transmission is greater than or equal to the minimum time interval, and may ignore the DCI that triggers the aperiodic SRS if the time interval for aperiodic SRS transmission is less than the minimum time interval.

[0145]

[0146] The spatialRelationInfo setting information in [Table 13] is used to indicate a reference signal to be referenced by the terminal to determine the beam to be applied for transmitting the corresponding SRS, and the terminal can configure the spatial filter or beam for transmitting the corresponding SRS to be identical to the spatial filter or beam used to receive or transmit the reference signal indicated by spatialRelationInfo. For example, the setting of spatialRelationInfo can include information such as [Table 14] below.

[0147]

[0148] Referring to the spatialRelationInfo setting, the index of the reference signal to be referenced in order to use the beam information of a specific reference signal, i.e., the SS / PBCH block index, CSI-RS index, or SRS index can be set. The upper signaling referenceSignal is configuration information indicating which beam information of which reference signal is to be referenced for the corresponding SRS transmission, and ssb-Index means the index of the SS / PBCH block, csi-RS-Index means the index of the CSI-RS, and srs means the index of the SRS, respectively. If the value of the upper signaling referenceSignal is set to 'ssb-Index', the terminal can apply the reception beam used when receiving the SS / PBCH block corresponding to ssb-Index as the transmission beam for the corresponding SRS transmission. If the value of the upper signaling referenceSignal is set to 'csi-RS-Index', the terminal can apply the reception beam used when receiving the CSI-RS corresponding to csi-RS-Index as the transmission beam for the corresponding SRS transmission. When the value of the upper signaling referenceSignal is set to 'srs', the terminal can apply the transmission beam used when transmitting the SRS corresponding to the srs as the transmission beam for the corresponding SRS transmission.

[0149] [SRS: Antenna switching]

[0150] Below, SRS for antenna switching is described.

[0151] The SRS transmitted from the terminal can be used by the base station to acquire DL CSI (Channel State Information) information (e.g., DL CSI acquisition). As a specific example, in a single cell or multi-cell (e.g., carrier aggregation (CA)) situation based on TDD (Time Division Duplex), the BS (Base Station) can schedule the transmission of SRS to the UE (User Equipment) and then measure the SRS transmitted from the UE. In this case, the base station can regard the uplink channel information estimated based on the SRS transmitted from the terminal as downlink channel information, assuming reciprocity between the DL (downlink) / UL (uplink) channels, and can perform downlink signal / channel scheduling for the terminal using this. In this case, the terminal can be configured to use antenna switching for the SRS for acquiring downlink channel information from the base station.

[0152] For example, according to the standard (e.g., 3gpp TS38.214), the usage of SRS can be set to the base station and / or terminal using a higher layer parameter (e.g., usage of RRC parameter SRS-ResourceSet). Here, the usage of SRS can be set to beam management usage, codebook transmission usage, non-codebook transmission usage, antenna switching usage, etc.

[0153] When a terminal receives the usage parameter in the upper layer signaling SRS-ResourceSet from the base station as 'antennaSwitching', the terminal can receive at least one upper layer signaling configuration from the base station according to the reported terminal capability. At this time, the terminal can report 'supportedSRS-TxPortSwitch' as ​​the terminal capability, and its value can be as follows. In the following, 'mTnR' can mean a terminal capability that supports transmission through m antennas and reception through n antennas.

[0154] - 't1r2': Terminal capability report value indicating that the terminal is capable of 1T2R operation.

[0155] - 't1r1-t1r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 1T2R operation.

[0156] - 't2r4': Terminal capability report value indicating that the terminal is capable of 2T4R operation.

[0157] - 't1r4': Terminal capability report value indicating that the terminal is capable of 1T4R operation.

[0158] - 't1r6': Terminal capability report value indicating that the terminal is capable of 1T6R operation.

[0159] - 't1r8': Terminal capability report value indicating that the terminal is capable of 1T8R operation.

[0160] - 't2r6': Terminal capability report value indicating that the terminal is capable of 2T6R operation.

[0161] - 't2r8': Terminal capability report value indicating that the terminal is capable of 2T8R operation.

[0162] - 't4r8': Terminal capability report value indicating that the terminal is capable of 4T8R operation.

[0163] - 't1r1-t1r2-t1r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, or 1T4R operation.

[0164] - 't1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T4R or 2T4R operation.

[0165] - 't1r1-t1r2-t2r2-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, or 2T4R operation.

[0166] - 't1r1-t1r2-t2r2-t1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, 1T4R, or 2T4R operation.

[0167] - 't1r1': Terminal capability report value indicating that the terminal is capable of 1T1R operation.

[0168] - 't2r2': Terminal capability report value indicating that the terminal is capable of 2T2R operation.

[0169] - 't1r1-t2r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 2T2R operation.

[0170] - 't4r4': Terminal capability report value indicating that the terminal is capable of 4T4R operation.

[0171] - 't1r1-t2r2-t4r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 2T2R, or 4T4R operation.

[0172]

[0173] [1T2R]

[0174] For the 1T2R operation of the terminal, upper layer signaling from the base station can be set for at least one combination of the following items, and operation can be performed accordingly.

[0175] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0176] -- If the terminal reports only srs-AntennaSwitching2SP-1Periodic-r17,

[0177] ---The terminal can receive up to two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, and can receive up to one SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, or

[0178] --- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0179] --- For the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0180] --- For the above, each SRS resource set may include two SRS resources transmitted in different OFDM symbols.

[0181] --- Regarding the above, each SRS resource within each SRS resource set can be configured with one SRS port, and the SRS ports of each SRS resource within each SRS resource set can be connected to different terminal antenna ports.

[0182] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0183] -- If the terminal reports only srs-ExtensionAperiodicSRS-r17,

[0184] --- The terminal can receive up to two SRS resource sets with a resourceType value of 'aperiodic' (aperiodic) within the upper layer signaling SRS-ResourceSet from the base station, and can receive up to one SRS resource set with a resourceType value of 'periodic' or 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, or

[0185] --- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0186] --- Regarding the above, if the terminal receives two SRS resource sets in which the resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station, each SRS resource in the two SRS resource sets can be transmitted in the same or different OFDM symbol positions in two different slots, each SRS resource set can include one SRS resource, each SRS resource in the two SRS resource sets can be configured with one SRS port, and the SRS ports of each SRS resource in the two SRS resource sets can be connected to different terminal antenna ports.

[0187] ---- For example, a first SRS resource configured with one SRS port may be included in a first SRS resource set, a second SRS resource configured with one SRS port may be included in a second SRS resource set, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position of a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position of a second slot. In this case, the first and second OFDM symbol positions may be the same or different within each slot, but the slot positions may be different from each other.

[0188] --- Regarding the above, if the terminal receives one SRS resource set in which the resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station, two SRS resources in the SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and each SRS resource in the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0189] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0190] --- Regarding the above, if the terminal receives one SRS resource set in which the resourceType value is 'periodic' or 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, two SRS resources in the SRS resource set can be transmitted at different OFDM symbol positions, each SRS resource in the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0191] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0192] -- If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal may receive from the base station up to two different SRS resource sets (e.g., 0, 1, or 2) in the upper layer signaling SRS-ResourceSet, where the resourceType value is 'periodic' or 'semi-persistent'. For example, the terminal may receive from the base station one of the following:

[0193] --- SRS resource set with resourceType value of 'periodic' or 'semi-persistent' is not set within upper layer signaling SRS-ResourceSet

[0194] --- One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0195] --- One SRS resource set with the resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0196] --- One SRS resource set with a resourceType value of 'periodic' and one SRS resource set with a value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet.

[0197] --- For the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0198] --- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0199] ----For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0200] -- If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, the terminal can configure up to two SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, and can configure up to one SRS resource set with a resourceType value of 'periodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0201] --- Regarding the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0202] --- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0203] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0204] -- If the terminal does not report only srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station at most one (e.g., 0 or 1) SRS resource set whose resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet. For example, the terminal may receive from the base station one of the following:

[0205] --- The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0206] --- One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0207] --- For the above, if one SRS resource set is configured, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations within the same slot, and each SRS resource within the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0208] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0209] -- If the terminal reports only srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station up to two (e.g., 0, 1, or 2) SRS resource sets whose resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet. For example, the terminal may receive from the base station one of the following:

[0210] --- The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0211] --- One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0212] --- Two SRS resource sets with resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0213] --- For the above, if one SRS resource set is configured, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations within the same slot, and each SRS resource within the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0214] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0215] --- For the above, if two SRS resource sets are configured, each SRS resource in the two SRS resource sets can be transmitted in the same or different OFDM symbol positions in two different slots, each SRS resource set can include one SRS resource, each SRS resource in the two SRS resource sets can be configured with one SRS port, and the SRS ports of each SRS resource in the two SRS resource sets can be connected to different terminal antenna ports.

[0216] ---- For example, a first SRS resource configured with one SRS port may be included in a first SRS resource set, a second SRS resource configured with one SRS port may be included in a second SRS resource set, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position of a first slot, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position of a second slot. In this case, the first and second OFDM symbol positions may be the same or different within each slot, but the slot positions may be different from each other.

[0217] - If the terminal does not report both srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17, which are terminal capability reports.

[0218] -- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0219] -- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and the SRS port of each SRS resource can be connected to different terminal antenna ports.

[0220] --- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and each SRS port of the first and second SRS resources may be connected to different terminal antenna ports, and the SRS port of the first SRS resource may be transmitted at a first OFDM symbol position, and the SRS port of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different, but the slot positions may be the same or different.

[0221] [2T4R]

[0222] For the 2T4R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0223] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0224] -- If the terminal reports only srs-AntennaSwitching2SP-1Periodic-r17,

[0225] --- The terminal can receive up to two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, and can receive up to one SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, or

[0226] --- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0227] --- For the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0228] --- For the above, each SRS resource set may include two SRS resources transmitted in different OFDM symbols.

[0229] --- Regarding the above, each SRS resource in each SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource in each SRS resource set can be connected to different terminal antenna ports.

[0230] ---- For example, the SRS resource set may include first and second SRS resources each consisting of one SRS port, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position, and the first and second OFDM symbol positions may be different within each slot, but may have the same or different slot positions.

[0231] -- If the terminal reports only srs-ExtensionAperiodicSRS-r17,

[0232] --- The terminal can receive up to two SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station, and can receive up to one SRS resource set with a resourceType value of 'periodic' or 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, or

[0233] --- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0234] --- Regarding the above, if the terminal receives two SRS resource sets in which the resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station, each SRS resource in the two SRS resource sets can be transmitted in the same or different OFDM symbol positions in two different slots, each SRS resource set can include one SRS resource, each SRS resource in the two SRS resource sets can be configured with two SRS ports, and the two SRS ports of each SRS resource in the two SRS resource sets can be connected to different terminal antenna ports.

[0235] ---- For example, a first SRS resource set may include a first SRS resource configured with two SRS ports, a second SRS resource set may include a second SRS resource configured with two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position of a first slot, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position of a second slot. In this case, the first and second OFDM symbol positions may be the same or different within each slot, but the slot positions may be different from each other.

[0236] --- Regarding the above, if the terminal receives one SRS resource set in which the resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station, two SRS resources in the SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and each SRS resource in the SRS resource set can be configured with two SRS ports, and the SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0237] --- Regarding the above, if the terminal receives one SRS resource set in which the resourceType value is 'periodic' or 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, two SRS resources in the SRS resource set can be transmitted at different OFDM symbol positions, each SRS resource in the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0238] ---- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0239] -- If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal may receive from the base station up to two different SRS resource sets (e.g., 0, 1, or 2) in the upper layer signaling SRS-ResourceSet, where the resourceType value is 'periodic' or 'semi-persistent'. For example, the terminal may receive from the base station one of the following:

[0240] --- SRS resource set with resourceType value of 'periodic' or 'semi-persistent' is not set within upper layer signaling SRS-ResourceSet

[0241] --- One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0242] --- One SRS resource set with the resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0243] --- One SRS resource set with a resourceType value of 'periodic' and one SRS resource set with a value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet.

[0244] --- For the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0245] --- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0246] ---- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different, but the slot positions may be the same or different.

[0247] -- If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, and up to one SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0248] --- Regarding the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0249] --- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0250] ---- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different, but the slot positions may be the same or different.

[0251] -- If the terminal does not report srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station at most one (e.g., 0 or 1) SRS resource set whose resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet. For example, the terminal may receive from the base station one of the following:

[0252] --- The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0253] --- One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0254] --- For the above, when one SRS resource set is configured, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations within the same slot, and each SRS resource within the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0255] ---- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0256] -- When the terminal reports srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station up to two (for example, 0, 1, or 2) SRS resource sets whose resourceType value is 'aperiodic' in the upper layer signaling SRS-ResourceSet. For example, the terminal may receive from the base station one of the following:

[0257] --- The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0258] --- One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0259] --- Two SRS resource sets with resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0260] --- For the above, if one SRS resource set is configured, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations within the same slot, and each SRS resource within the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0261] ---- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position within a first slot, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position within the same slot.

[0262] --- For the above, if two SRS resource sets are configured, each SRS resource in the two SRS resource sets can be transmitted in the same or different OFDM symbol positions in two different slots, each SRS resource set can include one SRS resource, each SRS resource in the two SRS resource sets can be configured with two SRS ports, and the two SRS ports of each SRS resource in the two SRS resource sets can be connected to different terminal antenna ports.

[0263] ---- For example, a first SRS resource set may include a first SRS resource configured with two SRS ports, a second SRS resource set may include a second SRS resource configured with two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position of a first slot, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position of a second slot. In this case, the first and second OFDM symbol positions may be the same or different within each slot, but the slot positions may be different from each other.

[0264] - If the terminal does not report both srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17, which are terminal capability reports.

[0265] -- The terminal can receive up to two SRS resource sets with different resourceType values ​​within the upper layer signaling SRS-ResourceSet from the base station.

[0266] -- For the above, each SRS resource set can include two SRS resources, and the two SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0267] --- For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, and the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, and the two SRS ports of the first SRS resource may be transmitted at a first OFDM symbol position, and the two SRS ports of the second SRS resource may be transmitted at a second OFDM symbol position. In this case, the first and second OFDM symbol positions may be different, but the slot positions may be the same or different.

[0268] [1T4R]

[0269] For the 1T4R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0270] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17, srs-ExtensionAperiodicSRS-r17, and srs-OneAP-SRS-r17.

[0271] -- If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal may receive from the base station at most one (e.g., 0 or 1) SRS resource set whose resourceType value is 'periodic' or 'semi-persistent' in the upper layer signaling SRS-ResourceSet. For example, the terminal may receive from the base station one of the following:

[0272] --- SRS resource set with resourceType value of 'periodic' or 'semi-persistent' is not set within upper layer signaling SRS-ResourceSet

[0273] --- One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0274] --- One SRS resource set with the resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0275] --- For the above, each SRS resource set can include four SRS resources, and the four SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0276] ---- For example, the SRS resource set may include first to fourth SRS resources each consisting of one SRS port, one SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port, and one SRS port of the first to fourth SRS resources may be transmitted at the first to fourth OFDM symbol positions, and the first to fourth OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0277] -- When the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet from the base station, and can receive up to one SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0278] --- Regarding the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0279] --- For the above, each SRS resource set can include four SRS resources, and the four SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0280] ---- For example, the SRS resource set may include first to fourth SRS resources each consisting of one SRS port, one SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port, and one SRS port of the first to fourth SRS resources may be transmitted at the first to fourth OFDM symbol positions, and the first to fourth OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0281] -- Depending on whether the terminal reports srs-ExtensionAperiodicSRS-r17 or srs-OneAP-SRS-r17 as a terminal capability report, the following upper layer signaling settings of the base station and terminal behavior can be expected.

[0282] --- If the terminal does not report both srs-ExtensionAperiodicSRS-r17 and srs-OneAP-SRS-r17, the terminal may receive 0 or 2 SRS resource sets with a resourceType value of 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0283] --- If the terminal reports both srs-ExtensionAperiodicSRS-r17 and srs-OneAP-SRS-r17, the terminal can receive 0, 1, 2, or 4 SRS resource sets with a resourceType value of 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0284] --- If the terminal reports only srs-ExtensionAperiodicSRS-r17 among srs-ExtensionAperiodicSRS-r17 and srs-OneAP-SRS-r17, the terminal can receive 0, 2, or 4 SRS resource sets with a resourceType value of 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0285] --- If the terminal reports only srs-OneAP-SRS-r17 among srs-ExtensionAperiodicSRS-r17 and srs-OneAP-SRS-r17, the terminal can receive 0, 1, or 2 SRS resource sets with a resourceType value of 'aperiodic' in SRS-ResourceSet, which is an upper layer signaling from the base station.

[0286] --- For the above, when one SRS resource set is configured, each SRS resource set can include four SRS resources, and the four SRS resources can be transmitted at different OFDM symbol locations within the same slot, and each SRS resource within the SRS resource set can be configured with one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0287] ---- For example, the SRS resource set may include first to fourth SRS resources each consisting of one SRS port, one SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port, and one SRS port of the first to fourth SRS resources may be transmitted at the first to fourth OFDM symbol positions within the same slot, and the first to fourth OFDM symbol positions may be different from each other.

[0288] --- For the above, if two SRS resource sets are set,

[0289] ---- Each SRS resource set may contain two SRS resources, or the first SRS resource set may have one SRS resource and the second SRS resource set may have three SRS resources.

[0290] ---- Each SRS resource within each SRS resource set can be transmitted in different OFDM symbol locations within the same slot, and SRS transmission for each SRS resource set can be performed in different slots. When transmitting SRS between different SRS resources in different SRS resource sets, transmission can be in the same or different OFDM symbol locations, but the slot locations can be different.

[0291] ---- Each SRS resource can be composed of one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0292] ---- For example, a first and a second SRS resource each configured with one SRS port may be included in a first SRS resource set, and a third and a fourth SRS resource each configured with one SRS port may be included in a second SRS resource set. One SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port. One SRS port of each of the first and second SRS resources may be transmitted at the first and second OFDM symbol positions within any same slot, and the first and second OFDM symbol positions may be different from each other. One SRS port of each of the third and fourth SRS resources may be transmitted at the third and fourth OFDM symbol positions within a different slot from that in which the first and second SRS resources are transmitted, and the third and fourth OFDM symbol positions may be different from each other. At this time, the first OFDM symbol position and the third and fourth OFDM symbol positions may be the same as or different from each other, and similarly, the second OFDM symbol position may also be the same as or different from the third and fourth OFDM symbol positions.

[0293] ---- As another example, a first SRS resource set may include a first SRS resource configured with one SRS port, and a second to fourth SRS resources each configured with one SRS port may be included in a second SRS resource set. One SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port. One SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within an arbitrary slot. One SRS port of each of the second to fourth SRS resources may be transmitted at a second to fourth OFDM symbol position within a slot different from that in which the first SRS resource is transmitted, and the second and fourth OFDM symbol positions may be different from each other. In this case, the first OFDM symbol position and the second to fourth OFDM symbol positions may be the same as or different from each other.

[0294] --- For the above, when four SRS resource sets are configured, each SRS resource set can include one SRS resource, and the four SRS resources can be transmitted in the same or different OFDM symbol positions within each slot, and SRS transmission for each SRS resource set can be performed in different slots. Each SRS resource within the SRS resource set can be configured with one SRS port, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0295] ---- For example, the first to fourth SRS resources may be included in the first to fourth SRS resource sets, respectively (i.e., one SRS resource is included in one SRS resource set), one SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port, and one SRS port of the first to fourth SRS resources may be transmitted at the first to fourth OFDM symbol positions in different slots, and the first to fourth OFDM symbol positions in each slot may be the same or different, but the slot positions may be different.

[0296] - If the terminal does not report all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17, srs-ExtensionAperiodicSRS-r17, and srs-OneAP-SRS-r17, i.e., does not report all three terminal capabilities.

[0297] -- The terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'periodic' or 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station.

[0298] --- Regarding the above, each SRS resource set can include four SRS resources, and the four SRS resources can be transmitted at different OFDM symbol locations, and each SRS resource within the SRS resource set can be configured with one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0299] ---- For example, the SRS resource set may include first to fourth SRS resources each consisting of one SRS port, one SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port, and one SRS port of the first to fourth SRS resources may be transmitted at the first to fourth OFDM symbol positions, and the first to fourth OFDM symbol positions may be different from each other, but the slot positions may be the same or different from each other.

[0300] -- The terminal may receive 0 or 2 SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station. If 2 SRS resource sets are configured, some or all of the following may be considered.

[0301] --- Each SRS resource set may contain two SRS resources, or the first SRS resource set may have one SRS resource and the second SRS resource set may have three SRS resources.

[0302] --- Each SRS resource within each SRS resource set can be transmitted in different OFDM symbol locations within the same slot, and SRS transmission for each SRS resource set can be performed in different slots. When transmitting SRS between different SRS resources in different SRS resource sets, transmission can be in the same or different OFDM symbol locations, but the slot locations can be different.

[0303] --- Each SRS resource can be composed of one SRS port, and one SRS port of each SRS resource can be connected to different terminal antenna ports.

[0304] --- For example, a first and a second SRS resource each configured with one SRS port may be included in a first SRS resource set, and a third and a fourth SRS resource each configured with one SRS port may be included in a second SRS resource set. One SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port. One SRS port of each of the first and second SRS resources may be transmitted at the first and second OFDM symbol positions within any same slot, and the first and second OFDM symbol positions may be different from each other. One SRS port of each of the third and fourth SRS resources may be transmitted at the third and fourth OFDM symbol positions within a different slot from that in which the first and second SRS resources are transmitted, and the third and fourth OFDM symbol positions may be different from each other. At this time, the first OFDM symbol position and the third and fourth OFDM symbol positions may be the same as or different from each other, and similarly, the second OFDM symbol position may also be the same as or different from the third and fourth OFDM symbol positions.

[0305] --- As another example, a first SRS resource set may include a first SRS resource configured with one SRS port, and a second to fourth SRS resources each configured with one SRS port may be included in a second SRS resource set. One SRS port of the first to fourth SRS resources may be connected to a different terminal antenna port. One SRS port of the first SRS resource may be transmitted at a first OFDM symbol position within an arbitrary slot. One SRS port of each of the second to fourth SRS resources may be transmitted at a second to fourth OFDM symbol position within a slot different from that in which the first SRS resource is transmitted, and the second and fourth OFDM symbol positions may be different from each other. In this case, the first OFDM symbol position and the second to fourth OFDM symbol positions may be the same as or different from each other.

[0306] - For the above, if multiple SRS resource sets are set (for example, if 2 or 4 SRS resource sets are set)

[0307] -- The terminal can expect that the values ​​of p0, alpha, pathlossReferenceRS, and srs-PowerControlAdjustmentStates, which are power control parameters that can be set by upper layer signaling within each SRS resource set from the base station, are set to the same value for all SRS resource sets. In other words, it can be expected that all multiple SRS resource sets have the same power control parameters. Such constraints can be described later as [Power Control Parameter Constraints].

[0308] --- [Power control parameter constraints] can only be applied to SRS resource sets for which the terminal has received the resourceType value set to 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0309] --- [Power control parameter constraints] can be applied to SRS resource sets for which the value of resourceType is set to 'periodic', 'semi-persistent', or 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0310] -- The terminal can expect that the aperiodicSRS-ResourceTrigger value, which is a higher layer signaling from the base station, or the value of one entry in the AperiodicSRS-ResourceTriggerList, which is a higher layer signaling, is set to the same value for all SRS resource sets. Such restrictions can be described later as [Aperiodic SRS Trigger Restrictions].

[0311] --- At this time, aperiodicSRS-ResourceTrigger, which is an upper layer signaling set in the SRS resource set from the base station, means aperiodic SRS trigger state information, and when the terminal receives an aperiodic SRS trigger for a specific aperiodic SRS trigger state from the base station through DCI, and the value set in aperiodicSRS-ResourceTrigger, which is an upper layer signaling, is an aperiodic SRS trigger state indicated by the DCI, the terminal can perform aperiodic SRS transmission for the SRS resource set.

[0312] --- Similarly, AperiodicSRS-ResourceTriggerList, which is an upper layer signaling set in an SRS resource set from a base station, includes information on multiple aperiodic SRS trigger states, and when a terminal receives an aperiodic SRS trigger for a specific aperiodic SRS trigger state from the base station through DCI, and the aperiodic SRS trigger state indicated by the DCI is included among multiple values ​​set in AperiodicSRS-ResourceTriggerList, which is an upper layer signaling, the terminal can perform aperiodic SRS transmission for the corresponding SRS resource set.

[0313] --- While the upper layer signaling, aperiodicSRS-ResourceTrigger, provided the ability for the corresponding SRS resource set to be included in one aperiodic SRS trigger state, the upper layer signaling, AperiodicSRS-ResourceTriggerList, provides the ability for the corresponding SRS resource set to be included in multiple aperiodic SRS trigger states, which may increase the possibility that the corresponding SRS resource set can be triggered from the base station.

[0314] --- The above [aperiodic SRS trigger constraints] can only be applied to SRS resource sets for which the terminal has received the resourceType value set to 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0315] -- The terminal can expect the slotOffset, the upper layer signaling within each SRS resource set from the base station, to have different values. Such restrictions can be described later as [Slot Offset Specifications].

[0316] --- The above [slot offset information] can be applied only to SRS resource sets for which the value of resourceType is set to 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0317] [1T1R, 2T2R, 4T4R]

[0318] For the 1T1R, 2T2R, and 4T4R operations of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operations may be performed accordingly.

[0319] - If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two SRS resource sets from the base station.

[0320] - When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive the following upper layer signaling settings from the base station.

[0321] -- Two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet, and one SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet.

[0322] --- Regarding the above, two SRS resource sets with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated simultaneously.

[0323] -- Up to 2 SRS resource sets

[0324] - Each SRS resource set contains one SRS resource, and for 1T1R, 2T2R, and 4T4R, the number of SRS ports set for each SRS resource can be 1, 2, and 4, respectively.

[0325] - For 1T1R, 2T2R, and 4T4R, the terminal may not expect SRS transmissions for two or more SRS resource sets with upper layer signaling usage set to 'antennaSwitching' to be set or triggered at the same OFDM symbol position.

[0326] [1T6R]

[0327] For the 1T6R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0328] - A terminal can receive up to one (i.e., 0 or 1) SRS resource set in which the resourceType value is 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, and one SRS resource set can include six SRS resources, and each SRS resource can be configured with one SRS port, and each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0329] - The terminal can receive the settings for the SRS resource set whose resourceType value is 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station as follows.

[0330] -- If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station.

[0331] -- When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two (i.e., 0, 1, or 2) SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, and two SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet may not be activated at the same time.

[0332] -- One SRS resource set can include six SRS resources, each SRS resource can be composed of one SRS port, each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0333] - The terminal can receive up to three SRS resource sets (i.e., 0, 1, 2, or 3) whose resourceType value is 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0334] -- When one SRS resource set is configured, six SRS resources can be included, each SRS resource can be configured with one SRS port, each SRS resource can be transmitted at a different OFDM symbol location within the same slot, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0335] -- When two SRS resource sets are configured, a total of six SRS resources can be divided and included in the two SRS resource sets, and each SRS resource can be configured with one SRS port, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0336] --- For example, the terminal may include the first to third SRS resources in the first SRS resource set, and the fourth to sixth SRS resources in the second SRS resource set. Transmission for the first to third SRS resources in the first SRS resource set may be performed in the first to third OFDM symbol positions in the first slot, and the first to third OFDM symbol positions may be different from each other. Transmission for the fourth to sixth SRS resources in the second SRS resource set may be performed in the fourth to sixth OFDM symbol positions in the second slot, and the fourth to sixth OFDM symbol positions may be different from each other. In this case, the first and second slot positions may be different from each other, and the first to third OFDM symbol positions and the fourth to sixth OFDM symbol positions may be the same or different from each other.

[0337] --- As another example, it may be possible for the first and second SRS resource sets to each include one (e.g., the first SRS resource) and five (e.g., the second to sixth SRS resources) SRS resources, and other combinations may not be excluded.

[0338] -- When three SRS resource sets are configured, a total of six SRS resources can be divided and included in the three SRS resource sets, and each SRS resource can be configured with one SRS port, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0339] --- For example, the terminal may include first and second SRS resources in the first SRS resource set, third and fourth SRS resources in the second SRS resource set, and fifth and sixth SRS resources in the third SRS resource set. Transmissions for the first and second SRS resources in the first SRS resource set may be performed at first and second OFDM symbol positions in the first slot, and the first and second OFDM symbol positions may be different from each other. Transmissions for the third and fourth SRS resources in the second SRS resource set may be performed at third and fourth OFDM symbol positions in the second slot, and the third and fourth OFDM symbol positions may be different from each other. Transmissions for the fifth and sixth SRS resources in the third SRS resource set may be performed at fifth and sixth OFDM symbol positions in the third slot, and the fifth and sixth OFDM symbol positions may be different from each other. At this time, the first, second, and third slot positions may be different from each other, and the first and second OFDM symbol positions, the third and fourth OFDM symbol positions, and the fifth and sixth OFDM symbol positions may be the same or different from each other.

[0340] --- As another example, it may be possible for the first, second, and third SRS resource sets to each include three (e.g., the first to third SRS resources), two (e.g., the fourth and fifth SRS resources), and one (e.g., the sixth SRS resource) SRS resources, and other combinations may not be excluded.

[0341] [1T8R]

[0342] For the 1T8R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0343] - A terminal can receive up to one (i.e., 0 or 1) SRS resource set in which the resourceType value is 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, and one SRS resource set can include eight SRS resources, and each SRS resource can be configured with one SRS port, and each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0344] - The terminal can receive the settings for the SRS resource set whose resourceType value is 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station as follows.

[0345] -- If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station.

[0346] -- When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two (i.e., 0, 1, or 2) SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, and two SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet may not be activated at the same time.

[0347] -- One SRS resource set can include eight SRS resources, each SRS resource can be composed of one SRS port, each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0348] - The terminal can receive 0, 2, 3, or 4 SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0349] -- When two SRS resource sets are configured, a total of eight SRS resources can be divided and included in the two SRS resource sets, and each SRS resource can be configured with one SRS port, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0350] --- For example, the terminal may include the first to fourth SRS resources in the first SRS resource set, and the fifth to eighth SRS resources in the second SRS resource set. Transmission for the first to fourth SRS resources in the first SRS resource set may be performed in the first to fourth OFDM symbol positions in the first slot, and the first to fourth OFDM symbol positions may be different from each other. Transmission for the fifth to eighth SRS resources in the second SRS resource set may be performed in the fifth to eighth OFDM symbol positions in the second slot, and the fifth to eighth OFDM symbol positions may be different from each other. In this case, the first and second slot positions may be different from each other, and the first to fourth OFDM symbol positions and the fifth to eighth OFDM symbol positions may be the same or different from each other.

[0351] --- As another example, it may be possible for the first and second SRS resource sets to each include one (e.g., the first SRS resource) and seven (e.g., the second to eighth SRS resources) SRS resources, and other combinations may not be excluded.

[0352] -- When three SRS resource sets are configured, a total of eight SRS resources can be divided and included in the three SRS resource sets, and each SRS resource can be configured with one SRS port, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and one SRS port of each SRS resource can be connected to a different terminal antenna port.

[0353] --- For example, the terminal may include the first to third SRS resources in the first SRS resource set, the fourth to sixth SRS resources in the second SRS resource set, and the seventh and eighth SRS resources in the third SRS resource set. Transmission for the first to third SRS resources in the first SRS resource set may be performed in the first to third OFDM symbol positions in the first slot, and the first to third OFDM symbol positions may be different from each other. Transmission for the fourth to sixth SRS resources in the second SRS resource set may be performed in the fourth to sixth OFDM symbol positions in the second slot, and the fourth to sixth OFDM symbol positions may be different from each other. Transmission for the seventh and eighth SRS resources in the third SRS resource set may be performed in the seventh and eighth OFDM symbol positions in the third slot, and the seventh and eighth OFDM symbol positions may be different from each other. At this time, the first, second, and third slot positions may be different from each other, and the first to third OFDM symbol positions, the fourth to sixth OFDM symbol positions, and the seventh and eighth OFDM symbol positions may be the same or different from each other.

[0354] --- As another example, it may be possible for the first, second, and third SRS resource sets to each include four (e.g., the first to fourth SRS resources), two (e.g., the fifth and sixth SRS resources), and two (e.g., the seventh and eighth SRS resources), and other combinations may not be excluded.

[0355] -- When 4 SRS resource sets are configured, a total of 8 SRS resources can be divided and included in the 4 SRS resource sets, and each SRS resource can be configured with 1 SRS port, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and SRS transmission for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and 1 SRS port of each SRS resource can be connected to a different terminal antenna port.

[0356] --- For example, the terminal may include first and second SRS resources in a first SRS resource set, third and fourth SRS resources in a second SRS resource set, fifth and sixth SRS resources in a third SRS resource set, and seventh and eighth SRS resources in a fourth SRS resource set. Transmissions for the first and second SRS resources in the first SRS resource set may be performed at first and second OFDM symbol positions in a first slot, and the first and second OFDM symbol positions may be different from each other. Transmissions for the third and fourth SRS resources in the second SRS resource set may be performed at third and fourth OFDM symbol positions in a second slot, and the third and fourth OFDM symbol positions may be different from each other. Transmissions for the fifth and sixth SRS resources in the third SRS resource set may be performed at fifth and sixth OFDM symbol positions in a third slot, and the fifth and sixth OFDM symbol positions may be different from each other. Transmission for the 7th and 8th SRS resources within the 4th SRS resource set can be performed in the 7th and 8th OFDM symbol positions in the 4th slot, and the 7th and 8th OFDM symbol positions can be different from each other. In this case, the 1st to 4th slot positions can be different from each other, and the 1st and 2nd OFDM symbol positions, the 3rd and 4th OFDM symbol positions, the 5th and 6th OFDM symbol positions, and the 7th and 8th OFDM symbol positions can be the same or different from each other.

[0357] --- As another example, it may be possible for the first, second, third, and fourth SRS resource sets to each include three (e.g., the first to third SRS resources), two (e.g., the fourth and fifth SRS resources), two (e.g., the sixth and seventh SRS resources), and one (e.g., the eighth SRS resource) SRS resources, and other combinations may not be excluded.

[0358] [2T6R]

[0359] For the 2T6R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0360] - A terminal can receive at most one (i.e., 0 or 1) SRS resource set in which the resourceType value is 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, and one SRS resource set can include three SRS resources, and each SRS resource can be composed of two SRS ports, and each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0361] - The terminal can receive the settings for the SRS resource set whose resourceType value is 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station as follows.

[0362] -- If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station.

[0363] -- When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two (i.e., 0, 1, or 2) SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, and two SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet may not be activated at the same time.

[0364] -- One SRS resource set can include three SRS resources, each SRS resource can be composed of two SRS ports, each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0365] - The terminal can receive up to three SRS resource sets (i.e., 0, 1, 2, or 3) whose resourceType value is 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0366] -- When one SRS resource set is configured, three SRS resources can be included, each SRS resource can be composed of two SRS ports, each SRS resource can be transmitted at different OFDM symbol locations within the same slot, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0367] -- When two SRS resource sets are configured, a total of three SRS resources can be divided and included in the two SRS resource sets, and each SRS resource can be composed of two SRS ports, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0368] --- For example, the terminal may include first and second SRS resources in the first SRS resource set, and may include third SRS resources in the second SRS resource set. Transmission for the first and second SRS resources in the first SRS resource set may be performed in the first and second OFDM symbol positions in the first slot, and the first and second OFDM symbol positions may be different from each other. Transmission for the third SRS resource in the second SRS resource set may be performed in the third OFDM symbol position in the second slot. In this case, the first and second slot positions may be different from each other, and the first and second OFDM symbol positions and the third OFDM symbol positions may be the same or different from each other.

[0369] --- As another example, it may be possible for the first and second SRS resource sets to contain one (e.g., the first SRS resource) and two (e.g., the second and third SRS resources) SRS resources, respectively, and other combinations may not be excluded.

[0370] -- When three SRS resource sets are set, a total of three SRS resources can be divided and included in the three SRS resource sets, and each SRS resource can be composed of two SRS ports, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0371] --- For example, the terminal may include a first SRS resource in a first SRS resource set, a second SRS resource in a second SRS resource set, and a third SRS resource in a third SRS resource set. Transmission for the first SRS resource in the first SRS resource set may be performed at a first OFDM symbol position in a first slot. Transmission for the second SRS resource in the second SRS resource set may be performed at a second OFDM symbol position in a second slot. Transmission for the third SRS resource in the third SRS resource set may be performed at a third OFDM symbol position in a third slot. In this case, the first, second, and third slot positions may be different from each other, and the first to third OFDM symbol positions may be the same or different from each other.

[0372] [2T8R]

[0373] For the 2T8R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items may be set, and operation may be possible accordingly.

[0374] - A terminal can receive up to one (i.e., 0 or 1) SRS resource set in which the resourceType value is 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, and one SRS resource set can include four SRS resources, and each SRS resource can be composed of two SRS ports, and each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0375] - The terminal can receive the settings for the SRS resource set whose resourceType value is 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station as follows.

[0376] -- If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station.

[0377] -- When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive up to two (i.e., 0, 1, or 2) SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet from the base station, and two SRS resource sets with a resourceType value of 'semi-persistent' in the upper layer signaling SRS-ResourceSet may not be activated at the same time.

[0378] -- One SRS resource set can include four SRS resources, each SRS resource can be composed of two SRS ports, each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0379] - The terminal can receive 0, 2, 3, or 4 SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0380] -- When one SRS resource set is configured, four SRS resources can be included, each SRS resource can be composed of two SRS ports, each SRS resource can be transmitted at different OFDM symbol locations within the same slot, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0381] -- When two SRS resource sets are configured, a total of four SRS resources can be divided and included in the two SRS resource sets, and each SRS resource can be composed of two SRS ports, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0382] --- For example, the terminal may include first and second SRS resources in the first SRS resource set, and third and fourth SRS resources in the second SRS resource set. Transmission for the first and second SRS resources in the first SRS resource set may be performed in the first and second OFDM symbol positions in the first slot, and the first and second OFDM symbol positions may be different from each other. Transmission for the third and fourth SRS resources in the second SRS resource set may be performed in the third and fourth OFDM symbol positions in the second slot, and the third and fourth OFDM symbol positions may be different from each other. In this case, the first and second slot positions may be different from each other, and the first and second OFDM symbol positions and the third and fourth OFDM symbol positions may be the same or different from each other.

[0383] --- As another example, it may be possible for the first and second SRS resource sets to each include one (e.g., the first SRS resource) and three (e.g., the second to fourth SRS resources) SRS resources, and other combinations may not be excluded.

[0384] -- When three SRS resource sets are configured, a total of four SRS resources can be divided and included in the three SRS resource sets, and each SRS resource can be composed of two SRS ports, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0385] --- For example, the terminal may include first and second SRS resources in the first SRS resource set, may include a third SRS resource in the second SRS resource set, and may include a fourth SRS resource in the third SRS resource set. Transmission for the first and second SRS resources in the first SRS resource set may be performed at the first and second OFDM symbol positions in the first slot, and the first and second OFDM symbol positions may be different from each other. Transmission for the third SRS resource in the second SRS resource set may be performed at the third OFDM symbol position in the second slot. Transmission for the fourth SRS resource in the third SRS resource set may be performed at the fourth OFDM symbol position in the third slot. In this case, the first, second, and third slot positions may be different from each other, and the first to fourth OFDM symbol positions may be the same or different from each other.

[0386] --- As another example, it may be possible for the first, second, and third SRS resource sets to each contain one (e.g., the first SRS resource), two (e.g., the second and third SRS resources), and one (e.g., the fourth SRS resource) SRS resource, and other combinations may not be excluded.

[0387] -- When 4 SRS resource sets are configured, a total of 4 SRS resources can be divided and included in the 4 SRS resource sets, each SRS resource can be composed of 2 SRS ports, all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, SRS transmission for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and the 2 SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0388] --- For example, the terminal may include the first, second, third, and fourth SRS resources in the first, second, third, and fourth SRS resource sets, respectively, and transmissions for the first, second, third, and fourth SRS resources in the first, second, third, and fourth SRS resource sets, respectively, may be performed in the first, second, third, and fourth OFDM symbol positions in the first, second, third, and fourth slots, respectively, and the first to fourth slot positions may be different from each other, and the first to fourth OFDM symbol positions may be the same or different from each other.

[0389] [4T8R]

[0390] For the 4T8R operation of the terminal, upper layer signaling from the base station can be set for at least one combination of the following items, and operation can be performed accordingly.

[0391] - If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17,

[0392] -- The terminal can receive up to two different SRS resource sets (e.g., 0, 1, or 2) from the base station, each with a resourceType value of 'periodic' or 'semi-persistent' in the upper layer signaling SRS-ResourceSet. For example, the terminal can receive one of the following from the base station.

[0393] --- SRS resource set with resourceType value of 'periodic' or 'semi-persistent' is not set within upper layer signaling SRS-ResourceSet

[0394] --- One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0395] --- One SRS resource set with the resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0396] --- One SRS resource set with a resourceType value of 'periodic' and one SRS resource set with a value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet.

[0397] --- For the above, each SRS resource set can include two SRS resources, each SRS resource can be composed of four SRS ports, each SRS resource can be transmitted at different OFDM symbol locations within the same or different slots, and the four SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0398] - When the terminal reports the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive from the base station up to two (i.e., 0, 1, or 2) SRS resource sets whose resourceType value is 'semi-persistent' within the upper layer signaling SRS-ResourceSet, and up to one (i.e., 0 or 1) SRS resource set whose resourceType value is 'periodic' within the upper layer signaling SRS-ResourceSet, and two SRS resource sets whose resourceType value is 'semi-persistent' within the upper layer signaling SRS-ResourceSet may not be activated at the same time.

[0399] -- Each SRS resource set can include two SRS resources, each SRS resource can be composed of four SRS ports, each SRS resource can be transmitted at a different OFDM symbol location within the same or different slots, and the four SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0400] - The terminal can receive 0, 1, or 2 SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet from the base station.

[0401] -- When one SRS resource set is configured, two SRS resources can be included, each SRS resource can be composed of four SRS ports, each SRS resource can be transmitted at different OFDM symbol locations within the same slot, and the four SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0402] -- When two SRS resource sets are set, a total of two SRS resources can be divided and included in the two SRS resource sets, and each SRS resource can be composed of four SRS ports, and all SRS resources in each SRS resource set can be transmitted at different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed at the same or different OFDM symbol positions in different slots, and the four SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0403] --- For example, the terminal may include first and second SRS resources in the first and second SRS resource sets, respectively, and transmission for the first and second SRS resources in the first and second SRS resource sets may be performed in the first and second OFDM symbol positions in the first and second slots, respectively. In this case, the first and second slot positions may be different from each other, and the first and second OFDM symbol positions may be the same or different from each other.

[0404] When a terminal performs antenna switching, i.e., transmits different SRS resources connected to different antenna ports, the time interval between two adjacent SRS resources among all transmitted SRS resources may typically require approximately 15 μs. Taking this into account, a (minimum) guard period can be defined, as shown in [Table 15] below.

[0405]

[0406] In [Table 15], μ represents numerology, Δf represents subcarrier spacing, and Y represents the number of OFDM symbols representing the guard interval, i.e., the length of the guard interval. Referring to [Table 15], the guard interval can be set based on the parameter μ, which determines the numerology. In the guard interval, the terminal is set not to transmit any other signals, and the guard interval can be set to be used entirely for antenna switching.

[0407] For example, a guard interval can be set between the transmission times of two adjacent SRS resources, taking into account SRS resources transmitted at different OFDM symbol locations within the same slot.

[0408] As another example, if a terminal is configured with two SRS resource sets for antenna switching purposes, and the two SRS resource sets are configured or triggered to be transmitted in two consecutive slots, and the terminal reports the terminal capability to transmit SRS in all OFDM symbol positions within the slots, the terminal may expect that there will be a guard interval for antenna switching for at least Y OFDM symbols based on [Table 15] between the last OFDM symbol in which an SRS transmission is performed within the first slot in which an SRS transmission for the first SRS resource set is performed and the first OFDM symbol in which an SRS transmission is performed within the second slot in which an SRS transmission for the second SRS resource set is performed. That is, the time difference between two actual SRS transmissions may be greater than or equal to Y OFDM symbols.

[0409] - For the guard interval between slots, similar to the guard interval between two SRS resources within the slots described above, if the actual time difference between the last SRS transmission of the first slot and the first SRS transmission of the next slot within two consecutive slots is Y OFDM symbols, the terminal may not transmit any signal during the corresponding Y OFDM symbol interval.

[0410] - For the inter-slot guard interval, if the actual time difference between the last SRS transmission of the first slot and the first SRS transmission of the next slot within two consecutive slots is Y OFDM symbols, and if all SRS transmissions before and after the inter-slot guard interval are dropped (cancelled) due to overlap with other signals, the terminal may determine that the inter-slot guard interval defined by Y OFDM symbols has been dropped (cancelled) by applying the same priority as the SRS transmissions before and after the guard interval, and if it is determined that the transmission has been dropped, it may perform uplink transmission in the inter-slot guard interval.

[0411] For the antenna switching method according to embodiments of the present disclosure, the terminal can expect that all SRS resources in all SRS resource sets in which the upper layer signaling usage within the SRS resource set is set to 'antennaSwitching' from the base station are set to have the same number of SRS ports.

[0412] For the antenna switching method based on 1T2R, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R operations according to embodiments of the present disclosure, the terminal may not expect that two or more SRS resource sets, of which usage, which is an upper layer signaling from the base station, is set to 'antennaSwitching', are set or triggered in the same slot.

[0413] For antenna switching methods based on 1T1R, 2T2R, and 4T4R operations according to embodiments of the present disclosure, a terminal may not expect that two or more SRS resource sets, in which usage, which is an upper layer signaling from a base station, is set to 'antennaSwitching', are set or triggered in the same OFDM symbol.

[0414] FIG. 3 is a diagram illustrating an SRS antenna switching operation according to an embodiment of the present disclosure.

[0415] The terminal represents a situation in which it operates in 1T4R, and may be configured with two aperiodic SRS resource sets (e.g., SRS resource sets #0 and #1). The terminal receives a PDCCH from a base station (300), and may be instructed to trigger aperiodic SRS for SRS resource set #0 (310) and SRS resource set #1 (320) through the PDCCH. At this time, the slot offset value for SRS resource set #0 (310) may be configured as slotOffset, which is an upper layer signaling, and the value is 1, and aperiodic SRS transmission for SRS resource set #0 may be performed at a position 1 slot later (i.e., in slot #1) from the slot in which the PDCCH is received. Additionally, the slot offset value for SRS resource set #1 (320) can be set to slotOffset, which is a higher layer signaling, and the value is 2, so that aperiodic SRS transmission for SRS resource set #1 can be performed at a position 2 slots later than the slot in which the PDCCH is received (i.e., at slot #2).

[0416] SRS resource #0 (311) and SRS resource #1 (312) included in SRS resource set #0 (310) are transmitted at different OFDM symbol positions within slot #1, and at this time, Y number of OFDM symbols may exist as a guard interval between SRS resources #0 and #1 (313). In addition, when transmitting for SRS resource #0 (330), the terminal can perform SRS transmission by connecting one SRS port to the first receiving antenna port (335) of the terminal, and when transmitting for SRS resource #1 (340), the terminal can perform SRS transmission by connecting one SRS port to the second receiving antenna port (345) of the terminal.

[0417] SRS resource #2 (321) and SRS resource #3 (322) included in SRS resource set #1 (320) are transmitted at different OFDM symbol positions within slot #2, and at this time, Y number of OFDM symbols may exist as a guard interval between SRS resources #2 and #3 (323). In addition, when transmitting for SRS resource #2 (350), the terminal can perform SRS transmission by connecting one SRS port to the third receiving antenna port (355) of the terminal, and when transmitting for SRS resource #3 (360), the terminal can perform SRS transmission by connecting one SRS port to the fourth receiving antenna port (365) of the terminal.

[0418] By connecting four SRS resources #0 to #3 to different receiving antenna ports of a terminal and transmitting SRS, the terminal can transmit SRS from all different receiving antenna ports so as to obtain channel information connected to all receiving antennas of the terminal, and through this, the base station can obtain channel information between the base station and the terminal and utilize it for uplink or downlink scheduling.

[0419] [SRS: Carrier switching]

[0420] Hereinafter, SRS carrier switching will be described. In a TDD system, SRS carrier switching is used to perform SRS transmission to support downlink channel estimation of the base station for supported cells that are not configured for PUSCH / PUCCH transmission, i.e., cells that only support downlink transmission. This is because channel reciprocity is established between the downlink and uplink channels in a TDD system, so the downlink channel can be estimated based on the uplink channel estimated by the base station through SRS. This has the advantage of requiring less overhead for downlink channel estimation through SRS-based channel recipocity compared to downlink channel estimation through CSI-RS when the base station supports a large number of antennas but the terminal supports a relatively small number of antennas.

[0421] In order to transmit SRS to a cell that only supports downlink transmission through SRS carrier switching, the UE must use the RF transmitter for uplink transmission of one of the other cells. This is because the target cell performing SRS carrier switching (hereinafter referred to as the target cell or target CC (component carrier)) is a frequency band that only supports downlink transmission for which PUCCH / PUSCH transmission is not configured, and thus the RF transmitter is not used except for the purpose of SRS carrier switching. Therefore, considering aspects such as the cost of the UE, a separate RF transmitter for uplink transmission to the target cell performing SRS carrier switching is not separately arranged, and when SRS carrier switching is scheduled (hereinafter, scheduling for performing SRS carrier switching may include scheduling based on AP (aperiodic) triggering based on DCI (downlink control information) format 2_3 or SP (semi-persistent) or P (periodic) triggering based on higher layer configuration), the UE can transmit SRS by retuning the RF transmitter for uplink transmission of the other cell. To perform SRS carrier switching, the cell where the RF transmitter is deployed before the terminal retunes can be defined as a source cell (hereinafter referred to as source cell or source CC), and this can be set in the terminal through the upper layer parameters srs-SwitchFromServCellIndex and srs-SwitchFromCarrier.The upper layer parameter srs-SwitchFromServCellIndex indicates the cell index of the source CC, and srs-SwitchFromCarrier indicates either NUL or SUL of the target CC to determine the RF transmitter to which the terminal should retun.

[0422] When performing SRS carrier switching, the UE requires a retuning time, which is the time it takes to prepare the RF transmitter of the source CC to transmit SRS to the target CC, and a time to retun the RF transmitter back to the source CC after transmitting all SRSs to the target CC. This is an additional time required in addition to the preparation time required to transmit SRS for purposes other than SRS carrier switching. In this way, the UE can report the UE capability to the base station to inform the base station of the required time for the RF transmitter retuning time before and after performing SRS carrier switching. At this time, the UE can report the retuning time of the RF transmitter to the base station through switchingTimeUL and switchingTimeDL.

[0423] Since the UE retunes the RF transmitter from the source CC to perform SRS carrier switching, it cannot transmit an uplink signal (e.g., PUCCH, PUSCH, or SRS) to the source CC while transmitting an SRS to the target CC. Therefore, to perform SRS carrier switching, the UE first checks whether the scheduled uplink transmission on the source CC overlaps with an SRS transmission including the RF retuning time. If the scheduled uplink transmission on the source CC overlaps with the scheduled SRS transmission (including the retuning time) on the target CC, and simultaneous transmission is not possible behind the UE's indicated UL CA capability, the UE compares the priorities between the two signals and can transmit only one uplink signal. At this time, the priorities for SRS carrier switching defined in NR release 15 / 16 are as follows:

[0424] - If the PUSCH or PUCCH and / or PRACH (physical random access channel) that includes one or more pieces of information from among HARQ-ACK / positive SR (scheduling request) / RI (rank indicator) / CRI (CSI-RS resource indicator) / SSBRI (SS / PBCH block resource indicator) in the source CC overlaps with the SRS transmission in the target CC, the UE may not transmit the SRS of the target CC. That is, the scheduled uplink signal in the source CC may be transmitted without performing SRS carrier switching.

[0425] - If a PUSCH containing aperiodic CSI on the source CC overlaps with a periodic or semi-persistent SRS transmission on the target CC, the UE may not transmit the periodic or semi-persistent SRS on the target CC. In other words, the UE may transmit the scheduled uplink signal on the source CC without performing SRS carrier switching.

[0426] - If PUCCH or PUSCH and / or SRS including periodic or semi-persistent CSI consisting of only one or more pieces of information among CQI (channel quality indicator) / PMI (precoding matrix indicator) / L1-RSRP (layer 1 reference signal received power) / L1-SINR (layer 1 signal to interference plus noise ratio) on the source CC overlaps with SRS transmission on the target CC, the UE may not transmit the PUCCH or PUSCH and / or SRS on the source CC. That is, the UE may transmit the SRS to the target CC by performing SRS carrier switching.

[0427] - If a PUSCH including aperiodic CSI consisting of only one or more pieces of information among CQI / PMI / L1-RSRP / L1-SINR in the source CC overlaps with an aperiodic SRS transmission in the target CC, the UE may not transmit the PUSCH of the source CC. That is, the UE may transmit an aperiodic SRS to the target CC by performing SRS carrier switching.

[0428] When comparing the priorities between uplink transmissions of a source CC and SRS transmissions of a target CC, the time it takes for the UE to receive and decode the DCI scheduling each transmission, the time it takes to decide on uplink transmission based on higher layer settings, the preparation time required to transmit the uplink signal, and the SRS transmission preparation time, which adds the RF retuning time of the target CC, must be taken into consideration. This is because, once the UE prepares for either the uplink transmission of the source CC or the SRS transmission of the target CC, it cannot cancel it. For example, even if a DCI scheduling a high-priority uplink signal transmission to the source CC is received while the UE is preparing for an SRS transmission to the already scheduled target CC (taking into account all preparation times, including DCI decoding and RF retuning time), the UE cannot cancel the SRS transmission to the target CC. Since this case is classified as a scheduling error case, the base station must consider the following conditions when performing SRS carrier switching: The UE must cancel one of the specific transmissions (the uplink signal transmission on the source CC or the SRS transmission on the target CC) by switching the carrier. (target CC) symbol Start SRS transmission from the carrier Symbol of (source CC) For conflicting uplink transmissions, the priority rules (priority rules between uplink transmissions of the source CC and SRS transmissions of the target CC) are applied considering the following conditions:

[0429] - The last symbol of PDCCH and The gap between the livers is at least Symbols and is greater than the sum of the last symbol of the PDCCH and The gap between the livers is at least DCI(s) larger than the symbol are received by the terminal. At this time, the DCI may correspond to both DCI scheduling uplink signal transmission in the source CC and DCI scheduling SRS transmission in the target CC.

[0430] - Semi-persistent CSI reporting or SRS transmission At least based on Symbols and is active before an interval greater than the sum of At least based on Activated prior to an interval greater than the symbol. The transmission activated at this time may include both uplink transmission from the source CC and SRS transmission from the target CC.

[0431] Here Is = max{switchingTimeUL,switchingTimeDL}, and the time interval unit of the OFDM symbol is , And it is determined based on the smallest SCS (subcarrier spacing) among the corresponding scheduling cells (if the overlapping uplink signal is not transmitted to the target CC or source CC). It refers to the processing ability according to the terminal's capability for the PUSCH preparation process time described later.

[0432] When a terminal receives an SRS request through DCI (or grant) for target CC c and transmits the nth aperiodic SRS, the terminal can start transmitting the SRS with the set symbol and slot that satisfies the following conditions:

[0433] - The set symbol and slot are values ​​that are later than the sum of the detailed conditions below.

[0434] -- The maximum time interval among the time intervals of the number of N OFDM symbols for each cell containing Target CC c and DCI (or grant)

[0435] -- Uplink or downlink RF retuning time defined by switchingTimeUL and switchingTimeDL of the upper layer parameters SRS-SwitchingTimeNR.

[0436] - Does not collide with any previous SRS transmission (SRS transmission prior to the nth aperiodic SRS) and is not interrupted by uplink or downlink RF retuning time.

[0437] If the condition is not satisfied, the terminal does not transmit the nth SRS, where N is the minimum time interval in symbol units between the DCI that triggers the aperiodic SRS and the aperiodic SRS, which is reported as the terminal capability.

[0438] In case of inter-band CA (carrier aggregation), based on the capabilities of the terminal, the terminal can simultaneously transmit SRS and PUCCH / PUSCH to CCs (component carriers) of different bands.

[0439] In case of inter-band CA (carrier aggregation), based on the capabilities of the terminal, the terminal can simultaneously transmit PRACH and SRS to CCs (component carriers) of different bands.

[0440] Figure 4 illustrates an example of SRS carrier switching.

[0441] In Fig. 4, DCI (401) received from target CC (400) can schedule SRS transmission (402) through SRS carrier switching. DCI (411) received from source CC (410) can schedule uplink transmission (412) that can overlap with SRS transmission (402). At this time, the transmission start symbol of SRS At least based on (403) (404) Symbol and (406) Two DCIs must be received before the sum of (405). Additionally, the uplink transmission start symbol from the source CC At least based on (413) (414) Two DCIs must be received before the symbol (415). In Fig. 4, (407) is the time required for RF retuning from downlink to uplink to perform SRS carrier switching, and (408) is the time required for RF retuning from uplink to downlink after performing SRS carrier switching.

[0442] [SRS Transmission Power Related]

[0443] As an example of the present disclosure, a method is described in which a terminal sets and transmits the transmission power of an uplink reference signal (SRS; Sounding Reference Signal) in response to a power control command received from a base station. The method comprises: setting the uplink reference signal transmission power (P) of the terminal together with an SRS power control adjustment state corresponding to the i-th transmission unit and the closed loop index l. SRS) can be determined as shown in [Mathematical Formula 6] below, which is expressed in dBm units. In [Mathematical Formula 6] below, when a terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined for each cell c, carrier frequency f, and bandwidth part b, and can be distinguished by indices b, f, and c.

[0444]

[0445] : The maximum transmission power available to the terminal in the i-th transmission unit, which can be determined by the power class of the terminal, parameters activated from the base station, and various parameters built into the terminal.

[0446] : Bandwidth part b, carrier frequency f, can be set to p0, which is the upper layer signaling for cell c, and SRS resource set can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0447] : Indicates the subcarrier spacing configuration value.

[0448] : It can indicate the amount of resources used in the i-th SRS transmission unit (e.g., the number of Resource Blocks (RBs) used for SRS transmission on the frequency axis).

[0449] : The bandwidth part b, carrier frequency f, and cell c can be set to alpha, which is the upper layer signaling, and the SRS resource set can be set through upper layer signaling, SRS-ResourceSet and SRS-ResourceSetId.

[0450] : It represents the path loss between the base station and the terminal, and the terminal uses the reference signal (RS) resource signaled by the base station. Path loss can be calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0451] : It can represent the SRS power control adjustment state value for the i-th SRS transmission unit corresponding to the closed loop index l within the bandwidth part b, carrier frequency f, and cell c.

[0452] The SRS power control adjustment state can be determined through the bandwidth part b, carrier frequency f, cell c, and i-th transmission unit.

[0453] - If the terminal is configured to have the same power control adjustment state value between SRS transmission and PUSCH transmission through the upper layer signaling srs-PowerControlAdjustmentStates, the SRS power control adjustment state can be expressed as in [Mathematical Formula 7] below, and in [Mathematical Formula 7] can indicate the current PUSCH power control adjustment status. In this case, various methods can be used. can be calculated and its value It can be used by substituting it into .

[0454]

[0455] - If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through upper layer signaling srs-PowerControlAdjustmentStates, and upper layer signaling tpc-Accumulation is not configured, the SRS power control adjustment state can be expressed regardless of closed loop l as in [Mathematical Formula 8] below.

[0456]

[0457] - : It may be a value indicated by the TPC command field included in DCI format 2_3, and the value may follow [Table 17].

[0458] -- is a specific set of the TPC command values ​​described above. For all transmission units corresponding to mine can mean the sum of . At this time is a set It can mean the number of all elements belonging to me. may mean a set of DCIs including all TPC command values ​​for which a TPC command accumulation operation is to be performed for the i-th PUSCH transmission unit. To determine the start and end points in the time dimension, all DCIs received by the terminal within the two points are defined. can be included as an element of .

[0459] --- The end point for determining is from the start symbol of the i-th SRS transmission unit. It could be as far back as the symbol.

[0460] --- The starting point for determining is from the starting symbol of the i-i0th SRS transmission unit. It can be a point as far back as the symbol. At this time, i0, which is a positive integer, is The end point for determining (from the start symbol of the i-th SRS transmission unit) From the starting symbol of the i-i0th SRS transmission unit, It can be determined as the smallest value that satisfies that the previous time point becomes an earlier time point in time by a symbol.

[0461] --- For example, The end point for determining can be defined as sym(i), and from the start symbol of the i-i0th SRS transmission unit, If a time point prior to a symbol can be defined as sym(i - i0), then if sym(i) = sym(i-1) > sym(i- 2) > sym(i-3), then i0 can be determined as 2.

[0462] - If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through upper layer signaling srs-PowerControlAdjustmentStates, and upper layer signaling tpc-Accumulation is configured (i.e., TPC command accumulation operation cannot be performed and absolute TPC command value can be applied), the SRS power control adjustment state can be expressed regardless of closed loop l as in [Mathematical Formula 9] below.

[0463]

[0464] -- As described above, it may be a value indicated by the TPC command field included in the DCI format 2_3 within the bandwidth part b, carrier frequency f, and cell c, and the value may follow [Table 3]. For example, if the value of the TPC command field is 0, can have a value of -4 dB.

[0465] [Regarding terminal capability reporting]

[0466] In LTE and NR, a terminal, while connected to a serving base station, can perform a procedure to report its supported capabilities to the base station. In the description below, this is referred to as a UE capability report.

[0467] A base station can transmit a UE capability inquiry message requesting capability reporting to a connected UE. The message can include a UE capability request for each RAT (radio access technology) type of the base station. The RAT type-specific request can include information on supported frequency band combinations, etc. Furthermore, in the case of a UE capability inquiry message, UE capabilities for multiple RAT types can be requested through a single RRC message container transmitted by the base station. Alternatively, the base station can include multiple UE capability inquiry messages containing UE capability requests for each RAT type and transmit them to the UE. In other words, the UE capability inquiry can be repeated multiple times within a single message, and the UE can compose and report the corresponding UE capability information message multiple times. In next-generation mobile communication systems, UE capability requests can be made for MR-DC (Multi-RAT dual connectivity), including NR, LTE, EN-DC (E-UTRA - NR dual connectivity). Furthermore, although the UE capability inquiry message is typically transmitted initially after a UE is connected to a base station, the base station can request it under any conditions when necessary.

[0468] When a terminal receives a UE capability report request from a base station, it configures the terminal capability based on the RAT type and band information requested from the base station. Below, we summarize how a terminal configures UE capability in an NR system.

[0469] 1. When the UE receives a list of LTE and / or NR bands through a UE capability request from the base station, the UE configures a band combination (BC) for EN-DC and NR stand-alone (SA). That is, a candidate list of BCs for EN-DC and NR SA is created based on the bands requested to the base station via FreqBandList. Furthermore, band priorities are prioritized in the order listed in FreqBandList.

[0470] 2. If the base station requests UE capability reporting by setting the "eutra-nr-only" flag or the "eutra" flag, the UE completely removes NR SA BCs from the candidate list of configured BCs. This operation can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0471] 3. The terminal then removes fallback BCs from the BC candidate list constructed in the above step. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. Since the BC before removing the band corresponding to at least one SCell can already cover the fallback BC, this step can be omitted. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step are the final "candidate BC list."

[0472] 4. The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list". In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report according to the preset rat-Type order (nr -> eutra-nr -> eutra). In addition, it constructs a featureSetCombination for the constructed supportedBandCombinationList, and constructs a list of "candidate feature set combinations" from the candidate BC list after removing the list for the fallback BC (which contains capabilities of the same or lower level). The "candidate feature set combinations" include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0473] 5. Also, if the requested rat Type is eutra-nr and has influence, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the feature set of NR can only be included in UE-NR-Capabilities.

[0474] After terminal capabilities are configured, the terminal transmits a terminal capability information message containing the terminal capabilities to the base station. Based on the terminal capabilities received from the terminal, the base station then performs appropriate scheduling and transmission / reception management for the terminal.

[0475] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. The contents of the present disclosure can be applied to FDD and TDD systems. In the present disclosure below, upper signaling (or upper layer signaling) refers to a signal transmission method in which a base station transmits a signal to a terminal using a downlink data channel of a physical layer, or a terminal transmits a signal to a base station using an uplink data channel of a physical layer, and may also be referred to as RRC signaling, PDCP signaling, or a MAC (medium access control) control element (MAC control element; MAC CE).

[0476] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having a specific format for the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or including a specific indicator that indicates whether cooperative communication is applied, or having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied being scrambled with a specific RNTI, or assuming cooperative communication is applied in a specific section indicated by a higher layer. An operation in which the terminal receives a PDSCH to which cooperative communication is applied based on conditions similar to the above may be referred to as an NC-JT case.

[0477] For convenience in the following description of the present disclosure, cells, transmission points, panels, beams, and / or transmission directions, which can be distinguished through upper layer / L1 parameters such as TCI state or spatial relation information, or indicators such as cell ID, TRP ID, and panel ID, may be uniformly described as TRP (transmission reception point), beam, or TCI state. Therefore, in actual application, TRP, beam, or TCI state may be appropriately replaced with one of the aforementioned terms.

[0478] Hereinafter, a base station is an entity that performs resource allocation of a terminal, and may be at least one of a gNode B, a gNB, an eNode B, a Node B, a BS (Base Station), a wireless access unit, a base station controller, or a node on a network. The terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Although the embodiments of the present disclosure are described below using a 5G system as an example, the embodiments of the present disclosure may be applied to other communication systems having a similar technical background or channel type. For example, this may include LTE or LTE-A mobile communication and mobile communication technologies developed after 5G. Therefore, the embodiments of the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure as determined by a person skilled in the art. The contents of the present disclosure can be applied to FDD and TDD systems.

[0479] Additionally, when describing the present disclosure, detailed descriptions of related functions or configurations will be omitted if they are deemed to unnecessarily obscure the gist of the present disclosure. Furthermore, the terms described below are defined based on the functions of the present disclosure and may vary depending on the intent or custom of the user or operator. Therefore, their definitions should be based on the contents of this specification.

[0480] In the following description of the present disclosure, upper layer signaling may include signaling corresponding to at least one or a combination of one or more of the following signaling.

[0481] - MIB (Master Information Block)

[0482] - SIB (System Information Block) or SIB

[0483] - RRC (Radio Resource Control)

[0484] - MAC (Medium Access Control) CE (Control Element)

[0485] Additionally, L1 signaling may include signaling corresponding to at least one or a combination of one or more of the following physical layer channels or signaling methods.

[0486] - PDCCH (Physical Downlink Control Channel)

[0487] - DCI (Downlink Control Information)

[0488] - UE-specific DCI

[0489] - Group common DCI

[0490] - Common DCI

[0491] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0492] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0493] - PUCCH (Physical Uplink Control Channel)

[0494] - UCI (Uplink Control Information)

[0495] In the present disclosure, determining the priority between A and B may be referred to in various ways, such as selecting a higher priority according to a predetermined priority rule and performing an action corresponding to it, or omitting or dropping an action for a lower priority.

[0496] The term slot used in the present disclosure below is a general term that may refer to a specific time unit corresponding to a TTI (Transmit Time Interval), and may specifically mean a slot used in a 5G NR system, or a slot or subframe used in a 4G LTE system.

[0497] In the following disclosure, the above examples are described through a number of embodiments, but they are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0498] Component and module technology for wireless communications is continuously evolving, enabling the development and production of these components at lower costs. These advancements not only allow base stations to support high-performance wireless communications with more antennas, but also enable uplink multiple-input multiple-output (UL MIMO) techniques, which allow terminals to operate with more than one antenna. Furthermore, carrier aggregation (CA), which increases the number of uplink and downlink bandwidths that a terminal can support, can be supported. When uplink CA is supported, an RF chain can be operated on each carrier (or carriers) to simultaneously support an uplink channel or an uplink reference signal (hereinafter, uplink channels and uplink reference signals can be used interchangeably as "uplink signals"). For example, an RF chain for transmitting an uplink signal can consist of a power amplifier (PA), a switch, a filter, etc., and an RF chain including a PA for uplink signal transmission can be implemented for each carrier. For convenience, the term "PA" is used in this context to represent an RF chain consisting of a PA, switch, and filter. However, it can be understood to encompass all components required for transmitting uplink signals. An RF chain, including a PA operating for each carrier, can support a certain level of power output. For example, a single PA in an RF chain transmitting a terminal's uplink channel can provide up to 23 dBm of transmit power.If multiple PAs of a terminal are used to transmit an uplink signal transmitted on a single carrier or multiple uplink signals transmitted on multiple carriers and the multiple PAs can simultaneously apply transmission power to transmit the uplink signal, the maximum transmit power that can be applied can be increased compared to when only a single PA is operated. For example, if two PAs capable of applying up to 23 dBm are both used to transmit an uplink signal of a single carrier, the terminal can apply a transmission power of up to 26 dBm to the uplink signal and transmit it through the transmit antennas to which the two PAs are connected.

[0499] In this way, multiple PAs are implemented in the terminal and can be used for uplink signal transmission on multiple carriers or on a single carrier. Depending on the method supported by the terminal, uplink throughput can be improved by transmitting different uplink signals on multiple carriers, or uplink coverage can be improved by transmitting a single uplink signal at higher transmission power on a single carrier. If the terminal can flexibly switch between PAs and clearly define the maximum transmission power that the terminal can transmit based on the PA operating conditions, the base station can optimize the uplink signal scheduling method based on the PA operating conditions.

[0500] Embodiments of the present disclosure propose a method for a terminal to determine and operate maximum transmission power for a terminal capable of flexibly switching multiple PAs, and specifically describe a method for the terminal to transmit an uplink signal to a base station and for the base station to receive the same based on the method.

[0501] <Flexible PA operation method of terminal and base station instruction method>

[0502] Hereinafter, a method for supporting flexible PA switching of a terminal to support multiple CCs by flexibly switching PAs of a terminal including multiple PAs and a specific method for a base station to instruct this will be described.

[0503] Some terminals may be implemented with multiple PAs capable of transmitting uplink signals to a base station. For example, a terminal may include two to four PAs, each supporting a different CC or the same CC. If multiple PAs are used to transmit uplink signals of different CCs, uplink transmission based on carrier aggregation (CA) can be supported. If multiple PAs are used to transmit uplink signals of a single CC, uplink transmission based on uplink MIMO using multiple antenna ports can be supported. In both cases, supporting multiple different CCs with multiple PAs or supporting a single CC can transmit uplink signals using a larger total maximum transmit power than supporting uplink transmission with a single PA. For example, if a terminal supports only one PA capable of supporting a transmit power of up to 23 dBm, the maximum transmit power of the terminal is 23 dBm. On the other hand, if the terminal supports four PAs that can support transmit power up to 23 dBm and each of the four PAs supports four CCs, the total maximum transmit power of the uplink signal transmitted on the four CCs can be increased to 29 dBm. Alternatively, if the terminal supports four PAs that can support transmit power up to 23 dBm and each of the four PAs supports a single CC, the maximum transmit power of the uplink signal transmitted on a single CC can be increased to 29 dBm.

[0504] Figures 5a, 5b, 5c and 5d illustrate examples of a case where a terminal including multiple PAs supports multiple CCs.

[0505] The terminal illustrated in the examples of FIGS. 5a, 5b, 5c, and 5d assumes that an RF chain (501, 502, 503, 504) including four PAs is implemented. It is also assumed that the terminal can support CAs that can be composed of up to four CCs (505, 506, 507, 508), such as intra-band CA, inter-band CA, or a mixed intra-band and inter-band CA.

[0506] Referring to FIG. 5a, the first example (500) illustrates a case where uplink CA based on two CCs (505, 506) is supported using four PAs (501, 502, 503, 504). If a terminal transmits an uplink signal through CC1 (505), the uplink signal can be transmitted using two PAs (501, 502). When a terminal transmits an uplink signal through CC1 (505), the terminal can transmit an uplink signal at a maximum of 26 dBm using two PAs with a maximum transmittable power of 23 dBm. If a terminal transmits an uplink signal through CC2 (506), the uplink signal can be transmitted using two PAs (503, 504). When the terminal transmits an uplink signal to CC2 (506), the terminal can transmit the uplink signal at a maximum of 26 dBm by using two PAs with a maximum transmittable power of 23 dBm. This first example (500) allows the terminal to increase the uplink throughput by using two CCs (505, 506) while increasing the coverage of the uplink signal transmitted to each CC (505 or 506) compared to the method of transmitting the uplink signal with a single PA.

[0507] Referring to FIG. 5b, the second example (510) illustrates a case where single carrier uplink transmission based on a single CC (505) is supported using four PAs (501, 502, 503, 504). The terminal can transmit an uplink signal through CC1 (505) using all four PAs (501, 502, 503, 504), and the terminal can transmit an uplink signal at a maximum of 29 dBm using the four PAs, each of which has a maximum transmittable power of 23 dBm. In this way, the second example (510) is an operational method for the terminal to increase uplink coverage using one CC (505), and can support improved coverage by scheduling the maximum power that the terminal can transmit.

[0508] Referring to FIG. 5c, the third example (520) illustrates a case where uplink CA based on two CCs (505, 507) is supported using only two PAs (501, 503) among four PAs (501, 502, 503, 504). When a terminal transmits an uplink signal to CC1 (505), the terminal can transmit the uplink signal at a maximum of 23 dBm using one PA (501) with a maximum transmittable power of 23 dBm. When a terminal transmits an uplink signal to CC3 (507), the terminal can transmit the uplink signal at a maximum of 23 dBm using one PA (503) with a maximum transmittable power of 23 dBm. In this way, the third example (520) can support UE power saving by turning off some of the PAs of the terminals that are not to be used based on sufficient coverage while increasing uplink throughput by using two CCs (505, 507).

[0509] Referring to FIG. 5d, the fourth example (530) illustrates a case where single carrier uplink transmission based on a single CC (505) is supported using only one PA (501) among four PAs (501, 502, 503, 504). When a terminal transmits an uplink signal to CC1 (505), the terminal can transmit the uplink signal at a maximum of 23 dBm using one PA (501) with a maximum transmittable power of 23 dBm. The terminal can support a terminal power saving function by turning off the other three PAs (502, 503, 504).

[0510] According to embodiments of the present disclosure, a terminal can support multiple PAs, and can support multiple CCs or a single CC by flexibly switching between the multiple PAs. If the uplink coverage and uplink throughput of a terminal supporting flexible PA switching are sufficient, the base station may not instruct the terminal to reduce uplink transmission power or increase power using additional PAs. In this case, the base station may instruct the terminal not to use some PAs to save terminal power. If the terminal turns off some inactive PAs according to the base station's instruction, the terminal can conserve additional power because it does not consume energy (e.g., standby power, etc.) even if the PAs do not apply transmission power for uplink transmission. In order for the base station and the terminal to perform these operations, the base station must be aware of the terminal's capabilities (UE capabilities), and the terminal can report UE capabilities for supporting the flexible PA switching function to the base station.

[0511] A base station may request a terminal to report terminal capabilities. A terminal capable of supporting flexible PA switching techniques based on multiple PAs may report corresponding UE capabilities to the base station. For example, the terminal may report UE capabilities by setting a parameter (specifically, FlexibleTxSwitching, etc.) to a value such as 'support' or 'enable' to indicate to the base station that it can support flexible PA switching. In addition, the terminal may configure band combinations that can support flexible PA switching techniques and report them to the base station. This may be reported as an element within the parameters for identifying that it can support flexible PA switching as described above, or as a separate parameter. The flexible PA switching technique may be supported for inter-band CA and / or intra-band CA.

[0512] A base station may request a terminal to report its capabilities, such as the power class (PC, for convenience) that the terminal can support and / or the number of RF chains that include a power amplifier (PA) implemented in the terminal. The terminal may report all of its capabilities for the power class and the number of PAs that it can support to the base station, or may report only some of its capabilities (e.g., the power classes that it can support) to the base station. For example, the terminal may report its capabilities for a power class to the base station. The terminal may report its capabilities for a power class to the base station per band and / or per band combination.

[0513] A terminal can use its terminal capability (e.g., ue-PowerClass) to report to a base station the maximum output power that the terminal can transmit when transmitting an uplink signal in a corresponding band, as a power class for each band. A terminal can use its terminal capability (e.g., powerClass) to report to a base station the sum of the maximum output powers that the terminal can transmit when transmitting an uplink signal in a corresponding band combination, as a power class for each band combination. If a terminal reports to a base station a powerClass having a value greater than ue-PowerClass, the power class reported by ue-PowerClass may mean the maximum output power that can be transmitted in a corresponding band within the band combination when the corresponding band combination is supported.

[0514] When reporting power classes for a band combination, in addition to the band-specific power classes (e.g., ue-PowerClass) that may be associated with the band combination and the band combination-specific power classes (powerClass), the UE can report new band-specific power classes to the base station. As a specific example, the UE can report all power classes that it can support per band to the base station. For example, if the UE supports flexible PA switching and can support PC3 (power class 3, with a maximum output power of 23 dBm), PC2 (power class 2, with a maximum output power of 26 dBm), and PC 1.5 (power class 1.5, with a maximum output power of 29 dBm) in a certain band (e.g., band1), the UE can set the UE capability parameter (e.g., powerClassforFlexibleSwitching) to pc1dot5-pc2-pc3 and report it to the base station for reporting new band-specific power classes. If the terminal supports only PC3 and PC2 for a given band (e.g., band2), the terminal can report to the base station a terminal capability parameter (e.g., powerClassforFlexibleSwitching) to report a new band-specific power class, setting it to pc2-pc3.

[0515] Candidate values ​​for a terminal capability parameter (e.g., powerClassforFlexibleSwitching) for reporting a new band-specific power class can be defined to indicate combinations of power classes that the terminal can support. For example, the terminal capability parameter (e.g., powerClassforFlexibleSwitching) can be set to pc3 or pc2-pc3 or pc1dot5-pc2-pc3 or pc1dot5-pc2, etc. The terminal can report the terminal capability parameter (e.g., powerClassforFlexibleSwitching) for reporting a new band-specific power class to the base station by including it in BandNR. Alternatively, the terminal can report the terminal capability parameter (e.g., powerClassforFlexibleSwitchingCA) for reporting a new band-specific power class to the base station. A terminal can report to the base station all power classes that it can support for a certain band combination and all power classes that it can support for each band that constitutes the band combination, using a parameter for reporting new band combination-specific power classes (e.g., powerClassforFlexibleSwitchingCA). As a specific example, if a terminal can support switching between PC2 and PC 1.5 for a certain band combination (e.g., a band combination including band1 and band2), the terminal can report to the base station the terminal capability parameter for reporting band combination-specific power classes (e.g., powerClassforFlexibleSwitchingCA) or a component parameter within the terminal capability parameter (e.g., powerClass within powerClassforFlexibleSwitchingCA) by setting it to pc1dot5-pc2.Additionally, all power classes that can be supported for the bands included in the band combination (e.g., a band combination including band1 and band2) can be reported as additional parameters. The terminal capability parameter for reporting all power classes that can be supported for the bands within the band combination can be reported as a subparameter of the terminal capability parameter for reporting power classes for each band combination, or can be reported as a separate terminal capability parameter.

[0516] In this disclosure, it is assumed that the terminal capability parameter for reporting all power classes that can be supported for a band within a band combination is defined as a sub-parameter of the terminal capability parameter for reporting power classes per band combination. If a component parameter (e.g., powerClass in powerClassforFlexibleSwitchingCA) in the terminal capability parameters for reporting all power classes for a certain band combination (e.g., a band combination including band1 and band2) is set to pc1dot5-pc2, and PC3 (power class 3, maximum output power of 23 dBm), PC2 (power class 2, maximum output power of 26 dBm), and PC 1.5 (power class 1.5, maximum output power of 29 dBm) can be supported by switching to one band (e.g., band1) in the band combination, and PC3, PC2, and PC1.5 can be supported by switching to another band (e.g., band2), then the parameter powerClassforUL1 for reporting all power classes that can be supported for band1 included in the band combination in powerClassforFlexibleSwitchingCA is set to pc1dot5-pc2-pc3, and the parameter for reporting all power classes that can be supported for band2 is set to pc1dot5-pc2-pc3. powerClassforUL2 can be reported to the base station by setting it to pc1dot5-pc2-pc3. Alternatively, if the number of bands included in the band combination is greater than 2, powerClassforULList can be defined in the form of a list, and powerClassforUL can be defined within powerClassforULList. All power classes that can be supported for the corresponding band can be reported to powerClassforUL.The first powerClassforUL in powerClassforULList can be defined as a parameter to report all supportable power classes for the first band of the given band combination, the second powerClassforUL can be defined as a parameter to report all supportable power classes for the second band of the given band combination, and the bands corresponding to powerClassforUL can be defined thereafter according to the same rules.

[0517] The terminal may report to the base station the number of RF chains (hereinafter referred to as PAs) including PAs implemented in the terminal together with the power classes per band and / or per band combination as described above. For example, if the terminal can support a certain band (e.g., band1) with two PAs, the terminal may set a terminal capability parameter (e.g., multiplePA) for reporting the maximum number of supportable PAs per band to '2' and report it to the base station. If the terminal can support a certain band combination (e.g., a band combination including band1 and band2) with four PAs, the terminal may set a terminal capability parameter (e.g., multiplePAforCA) for reporting the maximum number of supportable PAs per band combination to '4' and report it to the base station.

[0518] In addition to the terminal capability parameter for reporting the maximum number of PAs that can be supported per band combination, the terminal may also report the maximum number of PAs that can be supported for each band included in the band combination. For example, if a band combination (e.g., a band combination including band1 and band2) can be supported with up to four PAs, and a band within the band combination (e.g., band1) can be supported with up to two PAs, and another band within the band combination (e.g., band2) can be supported with up to two PAs, the terminal may set the terminal capability parameter for reporting the maximum number of PAs that can be supported per band combination (e.g., multiplePAforCA) to '4' and report to the base station the maximum number of PAs that can be supported for each band reported together with the terminal capability parameter (e.g., PAforUL1 and PAforUL2) each to '2'.

[0519] A terminal may not report its terminal capability for the number of PAs to the base station. However, the base station may implicitly determine the number of PAs for each band combination and / or band that the terminal can support by referring to new terminal capability parameters for reporting the terminal capability per band, terminal capability per band combination, power class per band combination, and / or power class per band within a band combination reported by the terminal. For example, if a terminal reports a component (e.g., powerClass) to report the power classes it can support for a band combination (e.g., a band combination including band1 and band2) within a new terminal capability parameter (e.g., powerClassforFlexibleSwitchingCA) to the base station as 'pc1dot5-pc2' for reporting the power classes it can support for a new band combination and a new power class per band within the band combination, and reports powerClassforUL1 as 'pc1dot5-pc2-pc3' and reports powerClassforUL2 as 'pc1dot5-pc2-pc3' for reporting the power classes it can support for each band within the band combination (e.g., band1 and band2), then the base station can determine that the terminal can support a total maximum transmit power of 29 dBm or 26 dBm for the corresponding band combination, and can support a maximum transmit power of 29 dBm or 26 dBm or 23 dBm for band1 within the corresponding band combination, and 29 dBm for band2. Alternatively, it can be determined that the maximum transmit power of 26 dBm or 23 dBm can be supported. Based on the terminal capabilities reported by the terminal, the base station can implicitly determine the terminal PA implementation as follows.

[0520] - If the terminal supports band1 as PC3, the base station can determine that the terminal can operate with a single PA capable of 23 dBm output. If the terminal supports band1 as PC2, the base station can determine that the terminal can operate with two PAs capable of 23 dBm output, considering that the terminal can support both PC3 and PC2 for band1. If the terminal supports band1 as PC1.5, the base station can determine that the terminal can operate with four PAs capable of 23 dBm output, considering that the terminal can support PC3, PC2, and PC1.5 for band1. Similarly, if the terminal supports band2 as PC3, the base station can determine that the terminal can operate with a single PA capable of 23 dBm output. If the terminal supports band2 as PC2, the base station can determine that the terminal can operate with two PAs capable of 23 dBm output, considering that the terminal can support both PC3 and PC2 for band2. If the terminal supports band 2 with PC1.5, the base station can determine that it can operate with four PAs capable of 23 dBm output by considering that the terminal can support PC3, PC2, and PC1.5 for band 2. If the terminal supports band combination 1 consisting of band 1 and band 2 with PC2, the base station can determine that it supports band 1 with one of the two PAs capable of 23 dBm output and supports band 2 with the other of the two PAs by referring to the terminal's operation for each band and the power class when supporting band combination 1. If the terminal supports band combination 1 consisting of band 1 and band 2 with PC1.5, the base station can determine that it supports both band 1 and band 2 using four PAs capable of 23 dBm output by referring to the terminal's operation for each band and the power class when supporting band combination 1. If the terminal supports band combination 1 with PC1.When supporting 5, the base station can determine that the terminal can support band 1 with two of the four PAs and band 2 with the other two of the four PAs. Alternatively, the base station can determine that the terminal can support band 1 or band 2 with three of the four PAs and band 2 or band 1 with the other one of the four PAs in addition to the method described above (supporting band 1 with two PAs and band 2 with two PAs), provided that the total maximum transmit power transmitted over the two bands does not exceed 26 dBm. In this case, the base station can request additional terminal capability reports from the terminal to understand that the terminal can support the method described below.

[0521] If, unlike the examples described above, all power class terminal capabilities that can be supported by band combinations and all power class terminal capabilities that can be supported by bands are reported, the base station can implicitly determine that the terminal is designed with an implementation different from the examples described above. As another example, if a terminal reports a component (e.g., powerClass) as 'pc1dot5' to report the power classes it can support for a band combination (e.g., a band combination including band1 and band2) within a new terminal capability parameter (e.g., powerClassforFlexibleSwitchingCA) to the base station for reporting new power classes per band combination and power classes per band within a band combination, and reports powerClassforUL1 as 'pc1dot5-pc2' and powerClassforUL2 as 'pc1.5-pc2' to report the power classes it can support for each band within the band combination (e.g., band1 and band2), then the base station can determine that the terminal can support a total maximum transmit power of 29 dBm for the corresponding band combination, and can determine that the terminal can support a maximum transmit power of 29 dBm or 26 dBm for band1 within the corresponding band combination, and can determine that the terminal can support a maximum transmit power of 29 dBm or 26 dBm for band2. The base station can implicitly determine the terminal PA implementation based on the terminal capabilities reported by the terminal, as follows:

[0522] - If the terminal supports band1 as PC2, the base station can determine that the terminal can operate with a single PA capable of 26 dBm output. If the terminal supports band1 as PC1.5, the base station can determine that the terminal can operate with two PAs capable of 26 dBm output, considering that the terminal can support both PC2 and PC1.5 for band1. Similarly, if the terminal supports band2 as PC2, the base station can determine that the terminal can operate with a single PA capable of 26 dBm output. If the terminal supports band2 as PC1.5, the base station can determine that the terminal can operate with two PAs capable of 26 dBm output, considering that the terminal can support both PC2 and PC1.5 for band2. If the terminal supports band combination 1 consisting of band 1 and band 2 as PC1.5, the base station can determine that band 1 is supported by one of the two PAs capable of 26 dBm output and band 2 is supported by the other of the two PAs by referring to the operation of the terminal for each band and the power class when supporting band combination 1.

[0523] In this way, the base station can implicitly infer the number of PAs implemented in the terminal by referring to the terminal capability parameters for the power classes that the terminal can support.

[0524] The base station can configure upper layer parameters based on the terminal capability parameters for the power classes that the terminal can support. At this time, the base station can configure upper layer parameters to support single-carrier transmission and reception using a single band for the terminal, or upper layer parameters to support CA-based transmission and reception using multiple bands. The base station can schedule the terminal to transmit an uplink signal using one or a combination of single-carrier-based, CA-based, coverage enhancement, or throughput enhancement techniques, taking into account various factors. The base station can consider various factors such as the channel quality between the base station and the terminal, the target uplink throughput, the available uplink resources, and / or the congestion of the base station (or band or carrier) to schedule the uplink signal for the terminal. The base station can determine the channel between the base station and the terminal based on the reception quality of the CSI reported by the terminal or the SRS received by the base station. The base station can assume the target uplink throughput by referring to the type of the terminal and / or the frequency of scheduling requests in which the terminal requests resources for uplink data transmission. A base station can decide which band combination (or which base stations) to support a terminal by considering the amount of uplink resources available for a band (or carrier) or the number of terminals supported for a band (or carrier).

[0525] Based on the various factors described above, the base station can instruct the terminal to change its power class to increase or decrease its maximum transmit power. For example, if the reception strength of the uplink signal transmitted by the terminal is weak and coverage needs to be increased, the base station can instruct the terminal to change to a power class that can support a higher maximum transmit power. In another example, if the base station determines that the received uplink signal is strong and the target uplink throughput can be met with a lower uplink transmit power, the base station can instruct the terminal to change to a power class that can support a lower maximum transmit power. In another example, if the received uplink signal is strong but the target uplink throughput needs to be increased, the base station can schedule more uplink data transmission based on uplink CA without instructing the terminal to change its power class so that it operates in the same power class. In order to determine whether to change the power class of the terminal, the base station must be able to understand or implicitly determine the current power class of the terminal. The base station reports the maximum transmit power (P) along with the power headroom through a power headroom report to determine the current terminal's power class. CMAX,f,c ) and if reported together, the power class of the terminal can be identified by referring to the Power Management Maximum Power Reduction (P-MPR), which is indicated by the maximum permissible emission (MPE). Alternatively, if it is decided to change the power class of the terminal as in the example described above regardless of the power class in which the terminal is currently operating, the base station may instruct the terminal to change the power class regardless of whether it knows the information about the current power class of the terminal.

[0526] A base station may consider one or a combination of the following methods to instruct a terminal to change power class.

[0527] - A change in the power class of a terminal can be indicated using an RRC parameter. The base station can reset the power class supported by the terminal through RRC reconfiguration. In this way, a new RRC parameter can be defined to support the power class change operation of an RRC-based terminal. The base station can configure a new RRC parameter defined in the terminal (e.g., powerClassforUL). The candidate values ​​of the new RRC parameter can be defined as any value for indicating the power class, such as 'pc3', 'pc2', or 'pc1.5', and the new RRC parameter can be configured per serving cell. As a specific example, the new RRC parameter (e.g., powerClassforUL) can be configured in ServingCellConfig. If the serving cell can be supported by other cells through methods such as CA or DC, and the power class for supporting the maximum transmission power that can be supported by the serving cell is set as an RRC parameter and an uplink signal is transmitted together with other serving cells through CA or DC, the sum of the transmission power of the uplink signals transmitted to each serving cell may be less than or equal to the maximum transmission power that the terminal can support. Alternatively, the new RRC parameter may be set per BWP. During RRC reconfiguration, the base station can set the power class in which the terminal will operate for each UL BWP through a new RRC parameter.

[0528] - The MAC CE format can be used to instruct a change in the power class of a terminal. The base station can change the power class supported by the terminal by transmitting a MAC CE to the terminal using the PDSCH. The base station can instruct a value for increasing or decreasing the size of the maximum transmission power using a field in the MAC CE, and can instruct the terminal to change the power class by using the increase or decrease in the size of the maximum transmission power. Alternatively, the base station can instruct the terminal to change the power class by instructing the terminal. The terminal can update the maximum transmission power by applying the power class change indicated by the MAC CE after a certain period of time (for example, 3 slots) after receiving the activation command indicated by the MAC CE and transmitting a PUCCH to report successful reception (ACK) thereof to the base station.

[0529] FIG. 6 illustrates an example of a MAC CE format for indicating a power class change according to one embodiment of the present disclosure.

[0530]

[0531] The base station can change the power class of the terminal in units of BWP within the serving cell using MAC CE, and at this time, a MAC CE format such as Format1 (600) or Format3 (620) can be used. If a MAC CE format for changing the power class of the terminal in units of BWP, such as Format1 (600), is used, the Serving Cell ID field (601) can indicate the identifier (ID) of the serving cell where the BWP is operated to which the power class change command that the base station instructs the terminal through the MAC CE format including the corresponding field is applied. The BWP ID field (602) can indicate the ID of the UL BWP to which the power class change command that the base station instructs the terminal through the MAC CE format including the corresponding field is applied. The ΔPC field (603) is a power class change command that the base station instructs the terminal to change to a power class that can support a larger maximum transmission power based on the power class that the terminal is currently operating in, or to change to a power class that can support a smaller maximum transmission power. The ΔPC field (603) can be composed of 2 bits and can be defined to change to a power class that can support the maximum transmission power by the amount of dB change indicated by the 2 bits as shown in Table 16 below. For example, if a current terminal is operating in Power Class 3 to transmit an uplink signal to a BWP in a serving cell and the base station successfully receives a MAC CE with the ΔPC field (603) set to 2 and changes to the power class indicated by the MAC CE after a certain period of time, the terminal can change from Power Class 3 to Power Class 2 and transmit an uplink signal scheduled thereafter. A power class that supports the maximum transmission power that the terminal can support (e.g., Power Class 1.5) If the base station is operating in a power class that supports the smallest maximum transmit power among the power classes that the terminal can support (e.g., Power Class 3) and instructs the terminal by setting the ΔPC field (603) in the MAC CE to 2 or 3, the terminal can ignore the activation command instructed by the base station. Similarly, if the base station is operating in a power class that supports the smallest maximum transmit power among the power classes that the terminal can support (e.g., Power Class 3) and instructs the terminal by setting the ΔPC field (603) in the MAC CE to 0, the terminal can ignore the activation command instructed by the base station.

[0532]

[0533] If a MAC CE format for changing the power class of a terminal in BWP units, such as Format2 (630), is used, the Power Class field (605) can indicate the power class to be supported by the terminal with 2 bits as shown in Table 17 below. Here, the First Power Class can be determined based on the terminal capability report reported by the terminal to inform the base station of the power class that can be supported for the corresponding serving cell (or band), and can mean a power class that can support the smallest maximum transmission power among the multiple supportable power classes reported by the terminal. As a specific example, if the terminal reports candidates of power classes that can be supported for the corresponding serving cell (or assumed to be band1) as 'pc1dot5-pc2-pc3', the First Power Class means Power Class 3. Similarly, the Second Power Class means Power Class 2 that can support the second largest maximum transmission power, and the Third Power Class means Power Class 1.5. The code point whose value of the Power Class field (605) is 3 can be reserved. If the number of power class candidates that the terminal can support is greater than 4, the number of bits in the Power Class field in the MAC CE may be greater than 2.

[0534]

[0535] As another example, a base station can use MAC CE to change the power class of a terminal on a serving cell basis, and at this time, a MAC CE format such as Format2 (610) or Format3 (630) can be used. If a MAC CE format for changing the power class of a terminal on a serving cell basis, such as Format2 (610) or Format3 (630), is used, a MAC CE format excluding the BWP ID field (602) described above can be used, and the MAC CE fields excluding the BWP ID field (602) can be used for the same purpose.

[0536] - A change in the power class of a terminal can be instructed using DCI. The base station can change the power class supported by the terminal by transmitting DCI to the terminal through PDCCH. The base station can instruct a value for increasing or decreasing the size of the maximum transmission power by using a new field in the DCI, and can instruct the terminal to change the power class by using the increase or decrease in the size of the maximum transmission power. The terminal can receive DCI (e.g., DCI format 0_1 ​​or format 0_2) for scheduling an uplink channel and change or maintain the power class according to a value indicated by a new DCI field for changing the power class included in the DCI. If the base station instructs the terminal to change the power class by using a new DCI field in the DCI for scheduling an uplink channel, the terminal can determine the transmission power by applying the changed power class when transmitting the uplink channel scheduled by the DCI and transmit the uplink channel. A new DCI field for changing the power class of a terminal included in the DCI may change the power class of the terminal for the BWP of the serving cell scheduled by the scheduling DCI. Alternatively, the new DCI field for changing the power class of the terminal included in the DCI may change the power class of the terminal for the serving cell scheduled by the scheduling DCI. The new DCI field for changing the power class of the terminal in the DCI may be defined identically (or similarly) to the ΔPC field (603) or the Power Class field (605) for changing the power class of the terminal based on the MAC CE. For example, the new DCI field in the DCI may consist of 2 bits and may indicate the Power Class of the terminal.Alternatively, a new format of DCI other than the DCI that schedules the uplink channel can be defined, or a group-common DCI can be used to instruct multiple terminals to change power classes simultaneously, to instruct terminals to change power classes.

[0537] - The TPC command for closed loop power control of DCI can be used to instruct to change to a power class that can support a higher maximum transmission power. Assume that the terminal transmits an uplink channel at the maximum transmission power based on the current power class. At this time, the base station can schedule the terminal to transmit the uplink channel at a higher transmission power using the TPC command in the DCI for scheduling the uplink channel. That is, if the previous uplink channel was transmitted using the maximum transmission power based on the current terminal's power class, and the TPC command included in the DCI for scheduling the uplink channel to be transmitted thereafter instructs to transmit the scheduled uplink channel at a higher uplink transmission power, the terminal can change the power class to support the higher maximum transmission power. If the base station wants to change the power class of the terminal to a power class that supports a lower maximum transmission power than the current terminal's power class, it can use a new DCI field or MAC CE or RRC reconfiguration as described above. In such cases, the DCI field or MAC CE field or RRC parameters can be configured using fewer bits, since the terminal does not indicate a change to a power class that can support a higher maximum transmit power.

[0538] Changing the power class of a terminal using MAC CE or DCI may affect the maximum transmit power that the terminal can operate when transmitting on an uplink channel. The terminal may consider any criteria (e.g., the smallest or largest or set as an RRC parameter) among the power classes that it can support, and determine the maximum transmit power P based on the power class that it can support. CMAX,f,c can determine the maximum transmission power P determined by the terminal. CMAX,f,c can be identified through the power headroom report performed by the terminal. The base station receives the P reported from the terminal. CMAX,f,c The power class of the terminal can be changed by referring to the quality of the uplink channel received by the base station. To instruct the base station to change the power class of the terminal, one or a combination of methods such as RRC reconfiguration, MAC CE activation command, or DCI instruction can be used. If the terminal changes the power class as instructed by the base station, the mathematical formula for determining the uplink transmission power can be updated as follows.

[0539]

[0540] [Mathematical expression 10] is a mathematical expression that reflects the change in maximum transmission power according to the change in power class based on [Mathematical expression 1]. When the terminal determines the transmission power of the uplink channel, the change in maximum transmission power is is defined as the change in maximum transmission power. The value can be determined according to the change in the power class indicated by the base station. For example, if the base station changes the terminal, which is currently in power class 3, to power class 1.5, the terminal can increase the maximum transmission power by 6 dB. Therefore, the change in maximum transmission power For example, it can be defined as 6 dB. As another example, if a base station changes a terminal currently in power class 2 to power class 3, the terminal can reduce its maximum transmission power by 3 dB. Therefore, the change in maximum transmission power can be defined as -3dB for this example.

[0541] If the maximum transmission power calculated by is greater than the maximum transmission power that the terminal can support, the terminal can be ignored. If the maximum transmission power calculated by is less than the smallest maximum transmission power that the terminal can support, the terminal can be ignored.

[0542] In one embodiment, the terminal changes the power class as instructed by the base station. Reflected in the calculation formula to determine can be re-determined.

[0543]

[0544] Here, means a value set to one of the RRC parameters p-Max or additionalPmax. It means the maximum UE power based on the power class that can support the maximum transmission power according to any criterion among the power classes that can be supported (for example, the smallest or largest or a criterion set by an RRC parameter, etc.). When P-max of 23 dBm or lower is indicated, it means the amount of power that the terminal must reduce from the maximum terminal power based on the power class, 6 dB if the power class is 1.5, and 3 dB if the power class is 2. If P-max is indicated as a value between 23 dBm and 26 dBm, for a terminal with power class 1.5 is defined as 3dB. is a value that can be added when certain conditions are satisfied, and is defined as 1 dB for power class 3 and 0.5 dB for power class 2 if all of the conditions described below are satisfied. The conditions that must be satisfied for a to be added are:

[0545] - The terminal capability to support power boost (e.g., powerBoostRel18 and / or powerBoostTsRel18 are reported and powerBoostPi2BPSKRel18 and / or powerBoostQPSKRel18 are set to 1) and if If is set At least It increases by that much.

[0546] - The terminal indicates power class 2 or power class 3 in the TDD band.

[0547] - is 0dB.

[0548] - Scheduled uplink transmission is transmitted based on DFT-s-OFDM and the modulation is Pi / 2 BPSK or QPSK.

[0549] - The allocated RV is the inner region.

[0550] - If the terminal indicates power class 3, uplink symbols are transmitted in less than 80% of the total symbols within a certain evaluation period.

[0551] - The terminal indicates power class 2, and the terminal capability parameters for maxUplinDutyCycle-PC2-FR1 and maxUplinkDutyCycle-PC1dot5-MPE-FR1 are reported as abset, and uplink symbols are transmitted in symbols less than 0.9*50% of all symbols within a certain evaluation period, or maxUplinkDutyCycle-PC2-FR1 is not absent and uplink symbols are transmitted in symbols less than 0.9*maxUplinkDutyCycle-PC2-FR1 among all symbols within a certain evaluation period, or maxUplinkDutyCycle-PC1dot5-FR1 is not absent and uplink symbols are transmitted in symbols less than 0.9*maxUplinkDutyCycle-PC1dot5-FR1 among all symbols within a certain evaluation period.

[0552] - Other than that is 0dB.

[0553] is a value indicating additional tolerance for serving cell c. It can be defined as 1.5 dB as a value to further relax the tolerance limit when the transmission bandwidth is transmitted within 4 MHz at both ends of the band. refers to the maximum power reduction applied to serving cell c and is defined as a different value for each power class supported by the terminal. means additional maximum output power reduction, which may indicate a value by which the output power is further reduced to meet requirements for effects due to signal radiation. This value represents the value to reduce the maximum output power when supporting shared spectrum access operation. It means the allowable reduction in transmission power for transmitting each SRS resource while transmitting SRS within the SRS resource set for antennaSwitching purposes. is the power management maximum power reduction, which means the amount of power reduction required to meet the electromagnetic energy absorption requirement.

[0554] [Mathematical formula 11] describes the operation of determining the transmission power range in which the terminal can set the maximum transmission power by considering the power class change instruction of the base station. The maximum transmission power of the terminal silver and can be determined by the value between. Similar to what was described in [Mathematical Formula 10], the change in maximum transmission power can be defined as the change in maximum transmission power Maximum transmission power according to which means the lower bound of and means upper bound The size of the maximum transmission power can be increased or decreased. If the base station instructs the terminal to a power class that can increase the maximum transmission power, the amount of change in the maximum transmission power If this positive value is determined, and The size of the base station can increase. On the other hand, the base station can indicate a power class that can reduce the maximum transmission power to the terminal, thereby changing the amount of maximum transmission power. If this is determined by a negative value, and The size of the can be reduced.

[0555] When a terminal changes to a power class indicated by a base station, a certain amount of time may be required to switch the RF chain including the PA. This switching time may require different switching periods depending on the terminal implementation. For example, a terminal capable of switching PAs quickly may report to the base station that it requires a short switching period, while a terminal capable of switching PAs slowly may report to the base station that it requires a long switching period. Based on the terminal capabilities reported by the terminal, the base station may avoid uplink scheduling by not transmitting the uplink channel during the period when the terminal is switching power classes.

[0556] <SRS setting / transmission method and uplink precoder instruction / application method when operating flexible PA of terminal>

[0557] Hereinafter, when operating a flexible PA switching technique, the RRC settings for transmitting SRS according to PA switching of a terminal, the method for transmitting SRS by a terminal, and the method for determining an uplink precoder by a base station based on this and instructing the terminal are described.

[0558] The base station can infer the number of PAs and Tx antennas implemented in the terminal by referring to the terminal capability report for the power class reported by the terminal. Alternatively, the terminal can inform the base station of the number of PAs through the terminal capability report.

[0559] The base station can determine the terminal capability reported by the terminal and the number of uplink antenna ports that can be supported. The base station can determine the number of uplink antenna ports that the terminal can support by referring to the terminal capability for the maximum number of layers that can be supported when transmitting PUSCH (terminal capability for the maximum number of layers that can be supported when transmitting codebook-based and / or non-codebook-based PUSCH), the terminal capability for the maximum number of SRS ports that can be supported per SRS resource (terminal capability for SRS for codebook use), or the terminal capability for the maximum number of SRS resources that can be supported within an SRS resource set (terminal capability for SRS for non-codebook use). In addition, the base station can determine the number of transmit antennas of the terminal by taking into account the terminal capability for the power class and / or the number of PAs that the terminal can support.

[0560] The base station determines the maximum number of antenna ports that the terminal can support, and in consideration of channel conditions and traffic between the terminal and the base station, the SRS can be set as follows to support flexible PA-based single or multiple CC-based uplink transmission, and the uplink precoder instruction and application method can be defined according to each SRS setting method.

[0561] Method 1: The base station can set an SRS resource set for the terminal that includes SRS resources set to the same number of SRS ports as the maximum number of antenna ports that the terminal can support, or an SRS resource set that includes SRS resources equal to the maximum number of antenna ports or layers that the terminal can support.

[0562] Method 2: The base station may configure the terminal with an SRS resource set including SRS resources set to the same number of SRS ports as the minimum number of antenna ports that the terminal can support, or an SRS resource set including SRS resources equal to the minimum number of antenna ports or layers that the terminal can support.

[0563] Method 3: The base station may configure the terminal with an SRS resource set including SRS resources set to a specific number of antenna ports (a minimum or maximum number of antenna ports may also be set) between the maximum number of antenna ports that the terminal can support and the minimum number of antenna ports that the terminal can support, or an SRS resource set including SRS resources set to a specific number of antenna ports (a minimum or maximum number of antenna ports may also be set).

[0564] Method 4: The base station can configure an SRS resource set for the terminal, which includes SRS resources set to a specific number of SRS ports equal to a specific number of antenna ports (a minimum or maximum number of antenna ports can also be set) between the maximum number of antenna ports that the terminal can support and the minimum number of antenna ports that the terminal can support. In this case, unlike Method 2, multiple SRS resources having multiple different numbers of SRS ports between the corresponding antenna port number ranges can be configured in one SRS resource set. For example, if the terminal can support from a minimum of one antenna port to a maximum of four antenna ports, the base station can configure an SRS resource set for codebook purposes to include an SRS resource with an SRS port number of 2 and an SRS resource with an SRS port number of 4 together.

[0565] If the base station and the terminal support [Method 1], and the terminal has been instructed by the base station to operate in a power class that can support the highest maximum transmit power that the terminal can support, all SRS ports or SRS resources configured in the terminal can be transmitted using all PAs. If the base station instructs the terminal to change to a power class in which some PAs are not used, the terminal can consider the following operations. In the first method, the terminal can reset the RRC parameters for SRS to reset an SRS resource set including an SRS resource set with the same number of SRS ports as the maximum number of antenna ports that can be supported by the changed power class, or an SRS resource set including SRS resources equal to the maximum number of antenna ports that can be supported. In the second method, the configured SRS parameters can be reused, and the terminal can transmit only some SRS ports or SRS resources. For example, if an SRS resource is configured with four SRS ports and only two antenna ports can be used by the terminal due to a power class change indicated by the base station, the terminal can transmit the corresponding SRS resource using only two SRS ports among the four SRS ports. In this case, the terminal can select any two SRS ports among the multiple (four) SRS ports or transmit the SRS using the two SRS ports according to a rule defined in advance by the base station and the terminal (e.g., the first two SRS ports, etc.).Since the number of SRS ports or SRS resources transmitted by the terminal can be identified by referring to the terminal capability and the power class change indicated by the base station, the base station can receive the SRS transmitted by the terminal and schedule the PUSCH by instructing the terminal to use an appropriate precoder or SRI (SRS resource indicator) based on the number of ports or resources of the received SRS. For example, if the terminal uses two ports out of four, the terminal and the base station can understand that they use the first and third ports. This is a definition in the specification, and in an actual implementation, the first port may be connected to the first RF chain and the third port may be connected to the second RF chain. After that, the base station can receive the SRS resources transmitted through the first and third ports and determine that no SRS resources are transmitted from the terminal to the second and fourth ports. The base station may receive SRS resources transmitted to the first port and the third port and schedule a precoder to the terminal in which the first antenna port and / or the third antenna port are set to a non-zero coefficient as an uplink precoder.

[0566] If the base station and the terminal support [Method 2], and the terminal has been instructed by the base station to operate in a power class that supports the lowest maximum transmit power that the terminal can support, the terminal can transmit the SRS port or SRS resources configured in the terminal using only the minimum PA. If the base station instructs the terminal to change to a power class in which more PAs can be used, the terminal can consider the following operations. In the first method, the base station can reset the RRC parameters for SRS in the terminal so that an SRS resource set including an SRS resource set with the same number of SRS ports as the maximum number of antenna ports that can be supported in the changed power class or an SRS resource set including the same number of SRS resources as the maximum number of antenna ports that can be supported. In the second method, the terminal can reuse the configured SRS parameters and virtualize some PAs and RF chains to transmit one SRS port (if codebook-based PUSCH is supported) or one SRS resource (if noncodebook-based PUSCH is supported). By virtualizing multiple RF chains in this way and transmitting, SRS ports or SRS resources can be transmitted at higher transmission power. For example, if an SRS resource is configured with two SRS ports and the base station indicates that four RF chains are available to the UE due to a power class change, the UE can virtualize two RF chains and transmit an SRS port, respectively. For example, the UE can virtualize the first and second RF chains to transmit SRS port 0, and the third and fourth RF chains to transmit SRS port 1.The base station can predict the SRS reception level by assuming the terminal's RF chain virtualization and schedule the PUSCH based on the received SRS, referencing the predicted SRS reception level. Because multiple RF chains can be virtualized to transmit uplink signals, the terminal can transmit uplink signals with higher transmission power, improving coverage.

[0567] If the base station and the terminal support [Method 3], the methods described in [Method 1] and [Method 2] can be considered and supported together. In particular, to support [Method 3], the second method of [Method 1] and the second method of [Method 2] can be selected and supported according to the change in the power class instructed by the base station to the terminal. For example, if the base station changes the power class to transmit the uplink signal to the terminal using a higher maximum transmit power and more PAs, the RF chain can be virtualized to transmit the uplink signal at a higher transmit power, as in the second method of [Method 2]. As another example, if the base station changes the power class to transmit the uplink signal to the terminal using a lower maximum transmit power and fewer PAs, the base station and the terminal can operate according to predefined rules so as not to use some ports, as in the second method of [Method 1].

[0568] If the base station and the terminal support [Method 4], the base station can configure the terminal with an SRS resource set including multiple SRS resources with different numbers of SRS ports or an SRS resource set including the same number of SRS resources as the maximum number of available ports. The terminal can determine the number of antenna ports to be supported by the terminal by referring to the power class indicated by the base station to the terminal, and the base station can also determine the current number of antenna ports of the terminal based on the indicated power class and the terminal capability reported by the terminal. Based on the determined current number of antenna ports of the terminal, the base station can receive an SRS resource that can support the determined number of antenna ports among the multiple SRS resources in the SRS resource set. If the base station schedules transmission of an SRS resource included in an SRS resource set to the terminal, the terminal can transmit to the base station all SRS resources in the SRS resource set, or only SRS resources that can be transmitted to antenna ports that the terminal can support, based on the currently indicated power class, depending on the terminal implementation. Regardless of the SRS transmission method according to the terminal implementation (specifically, the terminal may transmit all SRS resources according to the terminal implementation or may transmit only SRS resources that can be transmitted with the number of antenna ports that the terminal can support according to the indicated power class), the base station may determine the SRI and TPMI for scheduling the PUSCH based on the received SRS resources, the estimated uplink channel based on the received SRS, and the RRC parameters set in the terminal, and schedule the PUSCH to the terminal using these.For example, a base station can configure an SRS resource set including N (e.g., three) SRS resources as an RRC parameter to support codebook-based PUSCH to a UE. The N (e.g., three) SRS resources configured as an RRC parameter can be configured to be transmitted on different numbers of SRS ports (e.g., the first SRS resource is transmitted on one SRS port, the second SRS resource is transmitted on two SRS ports, and the third SRS resource is transmitted on four SRS ports). If the current UE supports power class 2 and can use two RF chains, the UE transmits an SRS resource that is transmitted on two SRS ports among the N SRS resources (e.g., the second SRS resource among three SRS resources in the SRS resource set). The base station can receive the SRS transmitted by the UE and schedule the PUSCH based on the SRS. A base station can transmit DCI to a terminal to schedule a PUSCH, and the SRI field in the DCI can be set to a value for indicating an SRS resource received by the terminal (for example, '10' for indicating the second SRS resource), and a TPMI can be transmitted in the DCI to indicate a precoder having the same number of ports as the number of SRS ports of the corresponding SRS resource (for example, two). At this time, the size of the SRI field is determined according to the total number of SRS resources in the SRS resource set, and the bit size of the TPMI field can be determined according to the number of ports of the largest SRS port and the maximum rank number (for example, the largest value among the values ​​set to maxRank). In the same situation as above, the base station sets the power class of the terminal to power class 1.When changing to 5 and the terminal can use four RF chains, the terminal transmits an SRS resource transmitted through four SRS ports among the N SRS resources (e.g., the third SRS resource among the three SRS resources in the SRS resource set). Similar to the above situation, the base station can indicate the SRS resource received by setting the SRI field to a value (e.g., '11' to indicate the third SRS resource) based on the received SRS resource, and can transmit a TPMI to the DCI to indicate a precoder having the same number of ports as the number of SRS ports of the corresponding SRS resource (e.g., four).

[0569] FIG. 7 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0570] Referring to FIG. 7, a terminal according to one embodiment may include a transceiver (710), a memory (720), and a processor (730). The transceiver (710), the memory (720), and the processor (730) of the UE may operate according to the communication method of the terminal described above. However, the components of the terminal are not limited thereto. For example, the terminal may include more or fewer components than those described above. In addition, the processor (730), the transceiver (710), and the memory (720) may be implemented as a single chip. In addition, the processor (520) may include at least one processor.

[0571] The transceiver (710) collectively refers to the UE receiver and the UE transmitter, and can transmit and receive signals with a base station or a network entity. The signals transmitted and received with the base station or a network entity may include control information and data. The transceiver (710) may include an RF transmitter for up-converting and amplifying the frequency of a transmission signal and an RF receiver for low-noise amplifying and down-converting the frequency of a reception signal. However, this is only an example of the transceiver (710), and the components of the transceiver (710) are not limited to the RF transmitter and the RF receiver. In addition, the transceiver (710) may receive a signal through a wireless channel, output it to the processor (730), and transmit the signal output from the processor (730) through the wireless channel.

[0572] The memory (720) can store programs and data necessary for the operation of the UE. Furthermore, the memory (720) can store control information or data included in signals acquired by the UE. The memory (720) can be a storage medium, such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, and a DVD, or a combination of storage media.

[0573] The processor (730) can control a series of processes to enable the terminal to operate. For example, the transceiver (710) can receive a data signal including a control signal transmitted by a base station or a network entity, and the processor (730) can determine the result of receiving the control signal and data signal transmitted by the base station or the network entity. For example, the processor can receive a DCI composed of two layers and control components of the terminal to simultaneously receive multiple PDSCHs. There may be multiple processors, and the processors can perform component control operations of the terminal by executing a program stored in memory.

[0574] FIG. 8 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0575] Referring to FIG. 8, a base station according to one embodiment may include a transceiver (810), a memory (820), and a processor (830). The transceiver (810), the memory (820), and the processor (830) of the base station may operate according to the communication method of the base station described above. However, the components of the base station are not limited thereto. For example, the base station may include more or fewer components than the components described above. In addition, the processor (830), the transceiver (810), and the memory (820) may be implemented as a single chip. In addition, the processor (830) may include at least one processor.

[0576] The transceiver (810) collectively refers to a base station receiver and a base station transmitter, and can transmit and receive signals with a terminal (UE) or a network entity. The signals transmitted and received with the terminal or network entity may include control information and data. The transceiver (810) may include an RF transmitter for up-converting and amplifying the frequency of a transmission signal and an RF receiver for low-noise amplifying and down-converting the frequency of a reception signal. However, this is only an example of the transceiver (810), and the components of the transceiver (810) are not limited to the RF transmitter and RF receiver. In addition, the transceiver (810) may receive a signal through a wireless channel and output it to the processor (830), and transmit a signal output from the processor (830) through the wireless channel.

[0577] The memory (820) can store programs and data necessary for the operation of the base station. Furthermore, the memory (820) can store control information or data included in signals acquired by the base station. The memory (820) can be a storage medium, such as a read-only memory (ROM), a random access memory (RAM), a hard disk, a CD-ROM, a DVD, or a combination of storage media. Furthermore, there can be multiple memories (820).

[0578] The processor (830) can control a series of processes to enable the base station to operate. For example, the transceiver (810) can receive a data signal including a control signal transmitted by a terminal, a base station, or a network entity, and the processor (830) can determine the result of receiving the control signal and data signal transmitted by the terminal, the base station, or the network entity. For example, the processor can configure two layers of DCIs including allocation information for a plurality of PDSCHs and control each component of the base station to transmit them. There may be multiple processors, and the processors can perform component control operations of the base station by executing a program stored in a memory.

[0579] The methods according to the embodiments described in the claims or specification of the present disclosure may be implemented in the form of hardware, software, or a combination of hardware and software.

[0580] When implemented in 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 are configured for execution by one or more processors within an electronic device. The one or more programs include instructions that cause the electronic device to execute methods according to the embodiments described in the claims or specification of the present disclosure.

[0581] These programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, read only memory (ROM), electrically erasable programmable read only memory (EEPROM), magnetic disc storage device, compact disc ROM (CD-ROM), digital versatile discs (DVDs) or other forms of optical storage device, magnetic cassette. Or, they may be stored in a memory configured as a combination of some or all of these. In addition, each configuration memory may be included in multiple numbers.

[0582] Additionally, the program may be stored on an attachable storage device that is accessible via a communication network, such as the Internet, an intranet, a local area network (LAN), a wide local area network (WLAN), a storage area network (SAN), or a combination thereof. Such a storage device may be connected to a device performing an embodiment of the present disclosure via an external port. Additionally, a separate storage device on the communication network may be connected to a device performing an embodiment of the present disclosure.

[0583] In the specific embodiments of the present disclosure described above, components included in the invention are expressed in the singular or plural form, depending on the specific embodiment presented. However, the singular or plural expressions are selected to suit the presented situation for convenience of explanation, and the present disclosure is not limited to singular or plural components. Components expressed in the plural form may be composed of singular elements, or components expressed in the singular form may be composed of plural elements.

[0584] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are only specific examples to easily explain the technical contents of the present disclosure and help understand the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it will be apparent to those skilled in the art that other modifications based on the technical idea of ​​the present disclosure are possible. In addition, the above-mentioned embodiments can be combined and operated with each other as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment can be combined with each other to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure can be combined with each other to operate a base station and a terminal. In addition, although the above-mentioned embodiments have been presented based on an FDD LTE system, other modifications based on the technical idea of ​​the above-mentioned embodiments can be implemented with other systems such as a TDD LTE system, 5G, or NR system.

[0585] Meanwhile, the order of description in the drawings explaining the method of the present invention does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0586] Alternatively, the drawings illustrating the method of the present invention may omit some components and include only some components within a scope that does not harm the essence of the present invention.

[0587] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not harm the essence of the invention.

[0588] Various embodiments of the present disclosure have been described above. The foregoing description of the present disclosure is for illustrative purposes only, and the embodiments of the present disclosure are not limited to the disclosed embodiments. Those skilled in the art will appreciate that the present disclosure can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present disclosure. The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present disclosure.

Claims

1. In a method performed by a terminal of a wireless communication system, A step of transmitting first information related to the control capability of the transmission power of the terminal to the base station; A step of receiving second information for indicating a PC (power class) from the base station; A method comprising the step of transmitting uplink data to the base station based on the transmission power corresponding to the indicated PC.

2. In paragraph 1, The first information includes third information about a PC that the terminal can support or fourth information indicating the number of PAs (power amplifiers) that the terminal can control, The third information includes at least one piece of information about a PC that can be supported by each band or each combination of bands, A method wherein the fourth information includes at least one number of PAs that can be supported per band or per band combination.

3. In paragraph 1, A step of receiving fifth information for instructing to turn off the PA from the base station; and A method further comprising the step of turning off at least one PA based on the fifth information.

4. In paragraph 1, Further comprising a step of receiving resource setting information for SRS (sounding reference signal) transmission of the terminal from the base station, The above resource setting information is associated with the second information, the method.

5. In a method performed by a base station of a wireless communication system, A step of receiving first information related to the control capability of transmission power of the terminal from the terminal; A step of determining a PC (power class) based on the first information; A step of transmitting second information for indicating the determined PC to the terminal; and A step of receiving uplink data from the terminal, method.

6. In paragraph 5, The first information includes third information about a PC that the terminal can support or fourth information indicating the number of PAs (power amplifiers) that the terminal can control, The third information includes at least one piece of information about a PC that can be supported by each band or each combination of bands, A method wherein the fourth information includes at least one number of PAs that can be supported per band or per band combination.

7. In paragraph 5, A method further comprising the step of transmitting fifth information for instructing the terminal to turn off the PA.

8. In paragraph 5, Further comprising a step of transmitting resource setting information for transmitting SRS (sounding reference signal) of the terminal to the terminal, The above resource setting information is associated with the second information, the method.

9. In the terminal of a wireless communication system, Transmitter and receiver; and Includes a control unit connected to the above transmitter and receiver, The above control unit: Transmitting first information related to the control capability of the transmission power of the terminal to the base station, Receive second information for indicating a PC (power class) from the above base station, A terminal configured to transmit uplink data to the base station based on the transmission power corresponding to the indicated PC.

10. In paragraph 9, The first information includes third information about a PC that the terminal can support or fourth information indicating the number of PAs (power amplifiers) that the terminal can control, The third information includes at least one piece of information about a PC that can be supported by each band or each combination of bands, The terminal, wherein the fourth information includes at least one number of PAs that can be supported by band or band combination.

11. In paragraph 9, the control unit, Receive fifth information from the above base station to instruct PA to turn OFF, A terminal, which is set to turn off at least one PA based on the above fifth information.

12. In paragraph 9, the control unit, It is configured to receive resource setting information for SRS (sounding reference signal) transmission of the terminal from the base station, The above resource setting information is associated with the second information, terminal.

13. In a base station of a wireless communication system, Transmitter and receiver; and Includes a control unit connected to the above transmitter and receiver, The above control unit: Receive first information related to the control capability of the transmission power of the terminal from the terminal, Determine the PC (power class) based on the above first information, Transmitting second information to the terminal for indicating the determined PC, A base station configured to receive uplink data from the terminal.

14. In paragraph 13, The first information includes third information about a PC that the terminal can support or fourth information indicating the number of PAs (power amplifiers) that the terminal can control, The third information includes at least one piece of information about a PC that can be supported by each band or each combination of bands, A base station, wherein the fourth information includes at least one number of PAs that can be supported by each band or each combination of bands.

15. In the 13th paragraph, the control unit. Transmit the fifth information to the above terminal to instruct the PA to turn OFF, It is set to transmit resource setting information for SRS (sounding reference signal) transmission of the terminal to the terminal, The above resource setting information is associated with the second information, the base station.

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