Method and device for changing pathloss reference reference-signal of SRS in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method performed by a terminal in a wireless communication system according to an embodiment of the present disclosure may comprise the steps of: transmitting, to a base station, UE capability information including information indicating that the terminal supports antenna switching; receiving, from the base station, a sound reference signal (SRS) configuration including a configuration related to multiple aperiodic SRS resource sets for antenna switching; receiving, from the base station, a medium access control (MAC) control element (CE) including an indication of changing a transmission configuration indication (TCI) state or a pathloss reference reference-signal for one SRS resource set among the multiple aperiodic SRS resource sets for antenna switching; equally applying the indication of changing to all of the multiple aperiodic SRS resource sets for antenna switching; and transmitting an SRS on the basis of the changed pathloss reference reference-signal or the changed TCI state.

Description

Method and device for changing the path loss reference signal of SRS 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 changing a path attenuation reference signal of an SRS (Sounding Reference Signal) in a wireless communication system and a device for performing the same.

[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] A method performed by a terminal in a wireless communication system according to one embodiment of the present disclosure may include the steps of: transmitting, to a base station, terminal capability information including information indicating that the terminal supports antenna switching; receiving, from the base station, an SRS configuration including configurations related to a plurality of aperiodic SRS resource sets for antenna switching; receiving, from the base station, a medium access control (MAC) control element (CE) including an indication of changing a pathloss reference reference signal or a transmission configuration indication (TCI) state for one SRS resource set among the plurality of aperiodic SRS resource sets for antenna switching; applying the indication of changing equally to all of the plurality of aperiodic SRS resource sets for antenna switching; and transmitting an SRS based on the changed pathloss reference reference signal or the TCI state.

[0009] The disclosed embodiment provides a device and method capable of effectively providing a service in a mobile communication system.

[0010] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0011] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0012] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0013] FIG. 4 is a diagram of a beam application time that can be considered when using an integrated TCI method in a wireless communication system according to an embodiment of the present disclosure.

[0014] FIG. 5 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure.

[0015] FIG. 6 is a diagram illustrating an example of setting a control region of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0016] FIG. 7 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0017] FIG. 8 is a diagram illustrating an SRS antenna switching operation according to an embodiment of the present disclosure.

[0018] Figure 9 illustrates an example of SRS carrier switching.

[0019] FIG. 10 is a diagram illustrating an SRS path attenuation reference standard signal change MAC-CE according to an embodiment of the present disclosure.

[0020] FIG. 11 is a diagram illustrating a MAC-CE for changing a TCI state of a semi-persistent, aperiodic SRS according to an embodiment of the present disclosure.

[0021] FIG. 12 is a diagram illustrating MAC-CE for simultaneous TCI state change of SRS resource based on serving cell set according to one embodiment of the present disclosure.

[0022] FIG. 13 is a diagram illustrating the operation of a terminal according to an embodiment of the present disclosure.

[0023] FIG. 14 is a diagram illustrating the operation of a base station according to an embodiment of the present disclosure.

[0024] FIG. 15 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0025] FIG. 16 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0026] A method performed by a terminal in a wireless communication system according to one embodiment of the present disclosure may include the steps of: transmitting, to a base station, terminal capability information including information indicating that the terminal supports antenna switching; receiving, from the base station, an SRS configuration including configurations related to a plurality of aperiodic SRS resource sets for antenna switching; receiving, from the base station, a medium access control (MAC) control element (CE) including an indication of changing a pathloss reference reference signal or a transmission configuration indication (TCI) state for one SRS resource set among the plurality of aperiodic SRS resource sets for antenna switching; applying the indication of changing equally to all of the plurality of aperiodic SRS resource sets for antenna switching; and transmitting an SRS based on the changed pathloss reference reference signal or the TCI state.

[0027] In one embodiment, the MAC CE may include at least one of an SRS resource set ID or an SRS resource ID indicating a change in the path attenuation reference reference signal or the TCI state.

[0028] In one embodiment, the step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the antenna switching may include, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the step of equally applying the changed path loss reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for the antenna switching.

[0029] In one embodiment, the step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the antenna switching may include, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the step of applying the change instruction of the path loss reference signal or the TCI state for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for the antenna switching in the same manner.

[0030] In one embodiment, the step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the antenna switching may include a step of applying the change instruction of the path attenuation reference signal or TCI state for the remaining SRS resource IDs except for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

[0031] A method performed by a base station in a wireless communication system according to one embodiment of the present disclosure may include the steps of: receiving, from a terminal, terminal capability information including information indicating that antenna switching is supported; transmitting, to the terminal, an SRS configuration including settings related to a plurality of aperiodic SRS resource sets for antenna switching; transmitting, to the terminal, a medium access control (MAC) control element (CE) including an instruction to change a pathloss reference reference signal or a transmission configuration indication (TCI) state for one SRS resource set among the plurality of aperiodic SRS resource sets for the antenna switching; applying the changed pathloss reference reference signal or the TCI state equally to all of the plurality of aperiodic SRS resource sets for the antenna switching; and receiving an SRS based on the changed pathloss reference reference signal or the TCI state.

[0032] In one embodiment, the MAC CE may include at least one of an SRS resource set ID or an SRS resource ID indicating a change in the path attenuation reference reference signal or the TCI state.

[0033] In one embodiment, the step of equally applying the changed path loss reference signal or the TCI state to all of the plurality of aperiodic SRS resource sets for the antenna switching may include, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the step of equally applying the changed path loss reference signal or the TCI state to the remaining plurality of aperiodic SRS resource sets for the antenna switching.

[0034] In one embodiment, the step of equally applying the changed path loss reference signal or the TCI state to all of the plurality of aperiodic SRS resource sets for the antenna switching may include, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the step of equally applying an instruction to change the path loss reference signal or the TCI state for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for the antenna switching.

[0035] In one embodiment, the step of equally applying the changed path loss reference reference signal or the TCI state to all of the plurality of aperiodic SRS resource sets for the antenna switching may include a step of applying a change instruction of the path loss reference reference signal or the TCI state for the remaining SRS resource IDs except for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

[0036] According to one embodiment of the present disclosure, a terminal of a wireless communication system includes a transceiver; and a controller coupled to the transceiver, wherein the controller transmits UE capability information including information indicating that the terminal supports antenna switching to a base station, receives from the base station an SRS configuration including settings related to a plurality of aperiodic SRS (sound reference signal) resource sets for antenna switching, receives from the base station a medium access control (MAC) control element (CE) including an instruction to change a pathloss reference reference signal or a transmission configuration indication (TCI) state for one SRS resource set among the plurality of aperiodic SRS resource sets for antenna switching, applies the instruction to change the pathloss reference reference signal to all of the plurality of aperiodic SRS resource sets for antenna switching, and controls to transmit an SRS based on the changed pathloss reference reference signal or the TCI state.

[0037] In one embodiment, the MAC CE may include at least one of an SRS resource set ID or an SRS resource ID indicating a change in the path attenuation reference reference signal or the TCI state.

[0038] In one embodiment, the control unit may control to equally apply the changed path attenuation reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

[0039] In one embodiment, if the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the control unit can control to apply the change instruction of the path attenuation reference signal or TCI state for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for the antenna switching in the same manner.

[0040] In one embodiment, the control unit can control the change instruction of the path attenuation reference signal or TCI state for the remaining SRS resource IDs except for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to be applied only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

[0041] A base station of a wireless communication system according to one embodiment comprises: a transceiver; And a controller coupled to the transceiver, wherein the controller receives UE capability information including information that supports antenna switching from a terminal, transmits an SRS configuration including settings related to a plurality of aperiodic SRS (sound reference signal) resource sets for antenna switching to the terminal, transmits a MAC (medium access control) control element (CE) including an instruction to change a pathloss reference reference signal or a transmission configuration indication (TCI) state for one SRS resource set among the plurality of aperiodic SRS resource sets for the antenna switching to the terminal, applies the changed pathloss reference reference signal or the TCI state equally to all of the plurality of aperiodic SRS resource sets for the antenna switching, and controls to receive an SRS based on the changed pathloss reference reference signal or the TCI state.

[0042] In one embodiment, the MAC CE may include at least one of an SRS resource set ID or an SRS resource ID indicating a change in the path attenuation reference reference signal or the TCI state.

[0043] In one embodiment, the control unit may control to equally apply the changed path attenuation reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

[0044] In one embodiment, if the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, the control unit can control to apply the change instruction of the path attenuation reference signal or TCI state for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for the antenna switching in the same manner.

[0045] In one embodiment, the control unit can control the change instruction of the path attenuation reference signal or TCI state for the remaining SRS resource IDs except for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to be applied only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

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

[0047] 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 ensure that the gist of the present disclosure is conveyed more clearly without obscuring it by omitting unnecessary explanations.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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).

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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 multiple access method typically allocates and operates 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, thereby distinguishing the data or control information of each user.

[0056] 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).

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] Hereinafter, a / b can be understood as at least one of a or b.

[0062] [NR time-frequency resources]

[0063] Below, the frame structure of the 5G system is described in more detail with reference to drawings.

[0064] FIG. 1 is a diagram illustrating a basic structure of a time-frequency domain in a wireless communication system according to one embodiment of the present disclosure.

[0065] The horizontal axis of Figure 1 represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time and frequency domains is a resource element (RE, 101), which can be defined as 1 OFDM symbol (102) on the time axis and 1 subcarrier (103) on the frequency axis. In the frequency domain (For example, 12) consecutive REs can constitute one resource block (RB, 104). One subframe (110) on the time axis can include multiple OFDM symbols (102). For example, the length of one subframe can be 1 ms.

[0066] FIG. 2 is a diagram illustrating a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0067] Figure 2 illustrates an example of a structure of a frame (Frame, 200), a subframe (Subframe, 201), and a slot (Slot, 202). One frame (200) can be defined as 10ms. One subframe (201) can be defined as 1ms, and therefore one frame (200) can be composed of a total of 10 subframes (201). One slot (202, 203) can be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( =14). 1 subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per 1 subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In an example of FIG. 2, cases where the subcarrier spacing setting value μ = 0 (204) and μ = 1 (205) are illustrated. When μ = 0 (204), 1 subframe (201) may be composed of one slot (202), and when μ = 1 (205), 1 subframe (201) may be composed of two slots (203). That is, the number of slots per 1 subframe ( ) may vary, and accordingly the number of slots per frame ( ) may vary. Depending on the subcarrier spacing setting μ and can be defined as [Table 1] below.

[0068] μ 0141011142022144043148084141601651432032

[0069] [Bandwidth Part (BWP)]

[0070] Next, the bandwidth part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0071] FIG. 3 is a diagram illustrating an example of bandwidth portion settings in a wireless communication system according to one embodiment of the present disclosure.

[0072] Figure 3 shows an example in which the UE bandwidth (300) is set to two bandwidth portions, namely, bandwidth portion #1 (BWP#1) (301) and bandwidth portion #2 (BWP#2) (302). The base station can set one or more bandwidth portions to the UE, and can set the information in [Table 2] for each bandwidth portion.

[0073]

[0074] Of course, the bandwidth part settings are not limited by Table 2, and in addition to the configuration information in Table 2, various parameters related to the bandwidth part can be set for the terminal. The configuration information can be transmitted from the base station to the terminal through upper layer signaling, for example, RRC (Radio Resource Control) signaling. At least one bandwidth part among the configured one or more bandwidth parts can be activated. Whether or not the configured bandwidth part is activated can be semi-statically transmitted from the base station to the terminal through RRC signaling or dynamically transmitted through DCI.

[0075] According to some embodiments, a terminal before RRC connection can be configured with an initial bandwidth portion (Initial BWP) for initial access from a base station through a Master Information Block (MIB). More specifically, the terminal can receive configuration information about a control resource set (CORESET) and a search space in which a PDCCH for receiving system information required for initial access (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)) and search space can be transmitted through the MIB during the initial access phase. The control space and search space configured by the MIB can each be regarded as identifier (ID) 0. The base station can notify the terminal of configuration information such as frequency allocation information, time allocation information, and numerology for control space #0 through the MIB. Additionally, the base station can notify the terminal of the monitoring cycle and monitoring occasion settings for control area #0, i.e., search space #0, via the MIB. The terminal can consider the frequency range set as control area #0 obtained from the MIB as the initial bandwidth portion for initial access. At this time, the identifier (ID) of the initial bandwidth portion can be considered as 0.

[0076] According to one embodiment of the present disclosure, the setting of the bandwidth portion supported by 5G can be used for various purposes.

[0077] In some embodiments, when the bandwidth supported by a terminal is smaller than the system bandwidth, this can be supported through bandwidth portion configuration. For example, the base station can configure the bandwidth portion frequency location (configuration information 2) for the terminal, thereby allowing the terminal to transmit and receive data at a specific frequency location within the system bandwidth.

[0078] Additionally, in some embodiments, a base station may configure multiple bandwidth segments for a terminal to support different numerologies. For example, to support data transmission and reception using both 15 kHz and 30 kHz subcarrier spacing for a given terminal, two bandwidth segments may be configured with subcarrier spacings of 15 kHz and 30 kHz, respectively. The different bandwidth segments may be frequency-division multiplexed (FDM), and when data is to be transmitted and received using a specific subcarrier spacing, the bandwidth segment configured for that subcarrier spacing may be activated.

[0079] Furthermore, in some embodiments, the base station may configure bandwidth portions with different bandwidth sizes for the terminal for the purpose of reducing power consumption of the terminal. For example, if the terminal supports a very large bandwidth, for example, 100 MHz, and constantly transmits and receives data using that bandwidth, very large power consumption may occur. In particular, monitoring unnecessary downlink control channels using a large bandwidth of 100 MHz in a situation where there is no traffic may be very inefficient in terms of power consumption. To reduce power consumption of the terminal, the base station may configure a bandwidth portion with a relatively small bandwidth, for example, 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0080] According to one embodiment of the present disclosure, in a method for setting a bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for an initial bandwidth portion (Initial BWP) through an MIB during the initial access phase. More specifically, the terminal can receive a control region (i.e., CORESET) for a downlink control channel on which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of a Physical Broadcast Channel (PBCH). The bandwidth of the control region set by the MIB can be regarded as the initial bandwidth portion, and the terminal can receive a Physical Downlink Shared Channel (PDSCH) on which the SIB is transmitted through the set initial bandwidth portion. In addition to receiving the SIB, the initial bandwidth portion can also be utilized for other system information (OSI), paging, and random access.

[0081] [Bandwidth Part (BWP) Change]

[0082] When one or more bandwidth part values ​​are set for a terminal, the base station can instruct the terminal to change (or switch, transition) the bandwidth part value using the bandwidth part indicator field in the DCI. For example, in FIG. 3, when the currently activated bandwidth part of the terminal is bandwidth part #1 (301), the base station can instruct the terminal to bandwidth part #2 (302) using the bandwidth part indicator in the DCI, and the terminal can perform a bandwidth part change to bandwidth part #2 (302) indicated by the bandwidth part indicator in the received DCI.

[0083] As described above, since DCI-based bandwidth part change can be indicated by DCI scheduling PDSCH or PUSCH, when a terminal receives a bandwidth part change request, it must be able to receive or transmit PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed bandwidth part. To this end, the standard stipulates the delay time (T) required when changing the bandwidth part. BWP ) and can be defined as in [Table 3], for example.

[0084] μNR Slot length (ms)BWP switch delay T BWP (slots)Type 1 Note 1 Type 2 Note 1 011310.52520.253930.125618Note 1: Depends on UE capability.Note 2: If the BWP switch invloves changing of SCS, the BWP switch delay is determined by the larger one between the SCS before BWP switch and the SCS after BWP switch.

[0085] The bandwidth-partial change delay time requirement supports Type 1 or Type 2 depending on the terminal's capability. The terminal can report the supported bandwidth-partial delay time type to the base station.

[0086] According to the requirement for bandwidth part change delay time mentioned above, when the terminal receives DCI including bandwidth part change indicator in slot n, the terminal changes to the new bandwidth part indicated by the bandwidth part change indicator in slot n+T. BWPThe completion can be done at a later time, and transmission and reception for the data channel scheduled by the DCI can be performed in the new bandwidth portion that has been changed. When the base station wants to schedule a data channel in the new bandwidth portion, the terminal's bandwidth portion change delay time (T BWP ), time domain resource allocation for the data channel can be determined. That is, when the base station schedules the data channel with a new bandwidth portion, the data channel can be scheduled after the bandwidth portion change delay time in the method of determining the time domain resource allocation for the data channel. Accordingly, the terminal can determine whether the DCI instructing the bandwidth portion change is after the bandwidth portion change delay time (T BWP ) may not be expected to indicate a slot offset (K0 or K2) value smaller than that.

[0087] If the terminal receives DCI (e.g., DCI format 1_1 or 0_1) indicating a bandwidth change, the terminal may not perform any transmission or reception during the time period from the third symbol of the slot in which the PDCCH including the DCI is received to the start point of the slot indicated by the slot offset (K0 or K2) value indicated by the time domain resource allocation indicator field in the DCI. For example, if the terminal receives DCI indicating a bandwidth change in slot n and the slot offset value indicated by the DCI is K, the terminal may not perform any transmission or reception from the third symbol of slot n to the symbol before slot n+K (i.e., the last symbol of slot n+K-1).

[0088] [Unified TCI state]

[0089] Hereinafter, a single TCI state indication and activation method based on the unified TCI scheme is described. The unified TCI scheme can refer to a method of integrating and managing the transmission and reception beam management methods, which were distinguished into the TCI state method used for downlink reception of the terminal in the existing Rel-15 and 16 and the spatial relation info method used for uplink transmission, into a TCI state. Therefore, when the terminal is instructed by the base station based on the unified TCI scheme, it can perform beam management using the TCI state even for uplink transmission. If the terminal has set a TCI-State, which is an upper layer signaling with the tci-stateId-r17, which is an upper layer signaling, from the base station, the terminal can perform operations based on the unified TCI scheme using the corresponding TCI-State. The TCI-State can exist in two forms: a joint TCI state or a separate TCI state.

[0090] The first type is a joint TCI state, and the terminal can be instructed by the base station about both the TCI state to be applied to uplink transmission and downlink reception through a single TCI-State. If the terminal is instructed about a TCI-State based on a joint TCI state, the terminal can be instructed about parameters to be used for downlink channel estimation using the RS (reference signal) corresponding to qcl-Type1 in the TCI-State based on the joint TCI state, and parameters to be used as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2. If the terminal is instructed about a TCI-State based on a joint TCI state, the terminal can be instructed about parameters to be used as an uplink transmission beam or transmission filter using the RS corresponding to qcl-Type2 in the TCI-State based on the joint DL / UL TCI state. In this case, if the terminal is instructed about a joint TCI state, the terminal can apply the same beam to both uplink transmission and downlink reception.

[0091] The second form is a separate TCI state, in which the terminal can be individually instructed by the base station to select a UL TCI state to apply to uplink transmission and a DL TCI state to apply to downlink reception. If the terminal is instructed to select a UL TCI state, the terminal can be instructed to select parameters to use as an uplink transmission beam or transmission filter using the reference RS or source RS configured in the UL TCI state. If the terminal is instructed to select a DL TCI state, the terminal can be instructed to select parameters to use for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the DL TCI state, and to select parameters to use as a downlink reception beam or reception filter using the RS corresponding to qcl-Type2.

[0092] If the terminal is instructed with both the DL TCI state and the UL TCI state, the terminal can be instructed with parameters to be used as an uplink transmission beam or a transmission filter using the reference RS or source RS set in the corresponding UL TCI state, and can be instructed with parameters to be used for downlink channel estimation using the RS corresponding to qcl-Type1 set in the corresponding DL TCI state, and can be instructed with parameters to be used as a downlink reception beam or a reception filter using the RS corresponding to qcl-Type2. In this case, if the reference RS or source RS set in the DL TCI state and UL TCI state to which the terminal is instructed are different, the terminal can individually apply beams to uplink transmission and downlink reception, respectively, based on the instructed UL TCI state and DL TCI state.

[0093] A terminal can receive a joint TCI state from a base station through upper layer signaling for up to 128 specific BWPs (Band-Width Parts) within a specific cell, and among the separate TCI states, a DL TCI state can receive a maximum of 64 or 128 specific BWPs within a specific cell through upper layer signaling based on the terminal capability report. Among the separate TCI states, the DL TCI state and the joint TCI state can use the same upper layer signaling structure. For example, if 128 joint TCI states are set and 64 DL TCI states are set among the separate TCI states, the 64 DL TCI states can be included in the 128 joint TCI states.

[0094] Among the separate TCI states, the UL TCI state can be set to a maximum of 32 or 64 upper layer signaling for each specific BWP within a specific cell based on the terminal capability report, and like the relationship between the DL TCI state and the joint TCI state among the separate TCI states, the UL TCI state and the joint TCI state among the separate TCI can also use the same upper layer signaling structure, and the UL TCI state among the separate TCI can use different upper layer signaling structures from the joint TCI state and the DL TCI state among the separate TCI states.

[0095] The use of different or identical upper layer signaling structures may be defined in the specification, or may be distinguished through another upper layer signaling established by the base station based on a terminal capability report containing information on which of the two usage modes the terminal can support.

[0096] The terminal can receive transmission and reception beam-related instructions in an integrated TCI manner using one of the joint TCI state and separate TCI state configured by the base station. The terminal can be configured by the base station via upper layer signaling whether to use either the joint TCI state or separate TCI state.

[0097] The terminal receives transmission / reception beam-related instructions using one of the methods selected from the joint TCI state and the separate TCI state through upper layer signaling. At this time, there may be two transmission / reception beam instruction methods from the base station: a MAC-CE-based instruction method and a MAC-CE-based activation and DCI-based instruction method.

[0098] If the terminal receives an instruction related to a transmit / receive beam using a joint TCI state method through upper layer signaling, the terminal can perform a transmit / receive beam application operation by receiving a MAC-CE indicating a joint TCI state from a base station, and the base station can schedule reception of a PDSCH including the MAC-CE to the terminal through a PDCCH. If the MAC-CE includes only one joint TCI state, the terminal can determine an uplink transmit beam or transmit filter and a downlink receive beam or receive filter using the indicated joint TCI state starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE was successful. If there are two or more joint TCI states included in the MAC-CE, the UE can confirm that the multiple joint TCI states indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting 3 ms after transmitting the PUCCH including HARQ-ACK information indicating whether reception of the PDSCH including the MAC-CE was successful, and activate the indicated joint TCI state. After that, the UE can receive the DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, the DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0099] If a terminal receives an instruction related to a transmit / receive beam using a separate TCI state method through upper layer signaling, the terminal can perform a transmit / receive beam application operation by receiving a MAC-CE indicating a separate TCI state from a base station, and the base station can schedule reception of a PDSCH including the corresponding MAC-CE to the terminal through a PDCCH. If the number of separate TCI state sets included in the MAC-CE is one, the terminal can determine an uplink transmit beam or transmit filter and a downlink receive beam or receive filter using the separate TCI states included in the indicated separate TCI state set starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception of the corresponding PDSCH was successful. At this time, a separate TCI state set may mean single or multiple separate TCI states that one code point of the TCI state field in DCI format 1_1 or 1_2 can have, and one separate TCI state set may include one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state. If there are two or more separate TCI state sets included in the MAC-CE, the UE may confirm that the multiple separate TCI state sets indicated by the MAC-CE correspond to each code point of the TCI state field of DCI format 1_1 or 1_2 starting from 3 ms after transmitting a PUCCH including HARQ-ACK information indicating whether reception for the corresponding PDSCH was successful, and may activate the indicated separate TCI state set.At this time, each code point of the TCI state field of DCI format 1_1 or 1_2 can indicate one DL TCI state, one UL TCI state, or one DL TCI state and one UL TCI state each. The terminal can receive DCI format 1_1 or 1_2 and apply a separate set of TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams. At this time, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL assignment) or may not include it (without DL assignment).

[0100] FIG. 4 is a diagram of a beam application time that can be considered when using an integrated TCI method in a wireless communication system according to an embodiment of the present disclosure.

[0101] As described above, the terminal may receive DCI format 1_1 or 1_2 from the base station, including (with DL assignment) or not including (without DL assignment) downlink data channel scheduling information, and apply one joint TCI state or a separate set of TCI states indicated by the TCI state field in the corresponding DCI to the uplink transmission and downlink reception beams.

[0102] - DCI format 1_1 or 1_2 with DL assignment (400): If the terminal receives DCI format 1_1 or 1_2 including downlink data channel scheduling information from the base station (401) and indicates one joint TCI state or a separate TCI state set based on the integrated TCI method, the terminal receives a PDSCH scheduled based on the received DCI (405), and can transmit a PUCCH including an HARQ-ACK indicating whether reception of the DCI and the PDSCH is successful (410). At this time, the HARQ-ACK can include the meaning of whether reception of both the DCI and the PDSCH is successful, and if at least one of the DCI and the PDSCH is not received, the terminal can transmit a NACK, and if reception of both is successful, the terminal can transmit an ACK.

[0103] - DCI format 1_1 or 1_2 without DL assignment (450): If the terminal receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information (455) and indicates one joint TCI state or a set of separate TCI states based on the integrated TCI method, the terminal may assume at least one combination of the following for the corresponding DCI.

[0104] ■ Includes scrambled CRC using CS-RNTI.

[0105] ■ The value of all bits assigned to all fields used as RV (Redundancy Version) fields is 1.

[0106] ■ The value of all bits assigned to all fields used as MCS (Modulation and Coding Scheme) fields is 1.

[0107] ■ The value of all bits assigned to all fields used as NDI (New Data Indication) fields is 0.

[0108] ■ For FDRA (Frequency Domain Resource Allocation) Type 0, the value of all bits allocated to the FDRA field is 0, for FDRA Type 1, the value of all bits allocated to the FDRA field is 1, and when the FDRA method is dynamicSwitch, the value of all bits allocated to the FDRA field is 0.

[0109] The terminal can transmit a PUCCH including a HARQ-ACK indicating whether reception was successful for the DCI format 1_1 or 1_2 assuming the above-described matters (460).

[0110] - For both DCI format 1_1 or 1_2 with DL assignment (400) and without DL assignment (450), if a new TCI state indicated through DCI (401, 455) is the same as a TCI state that has already been indicated and applied to an uplink transmission and downlink reception beam, the UE can maintain the previously applied TCI state, and if the new TCI state is different from the previously indicated TCI state, the UE can determine the application time of a joint TCI state or a separate TCI state set that can be indicated from the TCI state field included in the DCI as the time after the first slot (420, 470) after the time equal to BAT (beam application time, 415, 465) after the PUCCH transmission (430, 480), and can use the previously indicated TCI-state until (425, 475) before the corresponding slot (420, 470).

[0111] - For both DCI format 1_1 or 1_2 with DL assignment (400) and without DL assignment (450), the BAT can be set by upper layer signaling based on terminal capability report information as a specific number of OFDM symbols, and the numerology for the BAT and the first slot after the BAT can be determined based on the smallest numerology among all cells to which the joint TCI state or separate TCI state set indicated through the DCI is applied.

[0112] A terminal can apply one joint TCI state indicated via MAC-CE or DCI to reception of control resource sets connected to all terminal-specific search spaces, reception of PDSCHs scheduled as PDCCHs transmitted from the control resource sets, transmission of PUSCHs, and transmission of all PUCCH resources.

[0113] A terminal may apply one separate TCI state set, if one separate TCI state set indicated via MAC-CE or DCI includes one DL TCI state, to reception for control resource sets connected to all terminal-specific search spaces, to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and to all PUSCH and PUCCH resources based on the previously indicated UL TCI state.

[0114] A terminal can apply a separate TCI state set indicated via MAC-CE or DCI to all PUSCH and PUCCH resources if it includes one UL TCI state, and can apply it to reception of control resource sets connected to all terminal-specific search spaces based on previously indicated DL TCI states, and to reception of PDSCH scheduled as PDCCH transmitted from the corresponding control resource set.

[0115] When a separate set of TCI states indicated via MAC-CE or DCI includes one DL TCI state and one UL TCI state, the terminal may apply the DL TCI state to reception for all control resource sets associated with the terminal-specific search space and to reception for PDSCH scheduled as PDCCH transmitted from the control resource set, and may apply the UL TCI state to all PUSCH and PUCCH resources.

[0116] [Unified TCI state MAC-CE]

[0117] Hereinafter, a single TCI state indication and activation method based on the integrated TCI scheme is described. The terminal receives a PDSCH including the following MAC-CE from the base station, and from 3 slots after transmitting a HARQ-ACK for the corresponding PDSCH to the base station, the terminal can interpret each code point of the TCI state field in DCI format 1_1 or 1_2 based on the information in the MAC-CE received from the base station. That is, the terminal can activate each entry of the MAC-CE received from the base station to each code point of the TCI state field in DCI format 1_1 or 1_2.

[0118] FIG. 5 is a diagram illustrating another MAC-CE structure for activating and indicating a joint TCI state or a separate DL or UL TCI state in a wireless communication system according to an embodiment of the present disclosure.

[0119] The meaning of each field within the MAC-CE structure can be as follows.

[0120] - Serving Cell ID (500): This field can indicate which serving cell the MAC-CE is applied to. The length of this field can be 5 bits. If the serving cell indicated by this field is included in one or more of the upper layer signaling simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, the MAC-CE can be applied to all serving cells included in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, and simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0121] - DL BWP ID (505): This field can indicate to which DL BWP the corresponding MAC-CE applies, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0122] - UL BWP ID (510): This field can indicate which UL BWP the corresponding MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth part indicator in the DCI. The length of this field can be 2 bits.

[0123] - Pi (515): This field can indicate whether each code point in the TCI state field in DCI format 1_1 or 1_2 has multiple TCI states or a single TCI state. If the value of Pi is 1, it means that the corresponding ith code point has multiple TCI states, which may mean that the corresponding code point may include a separate DL TCI state and a separate UL TCI state. If the value of Pi is 0, it means that the corresponding ith code point has a single TCI state, which may mean that the corresponding code point may include either a joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0124] - D / U (520): This field can indicate whether the TCI state ID field in the same octet is a joint TCI state, a separate DL TCI state, or a separate UL TCI state. If this field is 1, the TCI state ID field in the same octet can be a joint TCI state or a separate DL TCI state, and if this field is 0, the TCI state ID field in the same octet can be a separate UL TCI state.

[0125] - TCI state ID (525): This field can indicate a TCI state that can be identified by the upper layer signaling TCI-StateId. If the D / U field is set to 1, this field can be used to express the TCI-StateId, which can be expressed in 7 bits. If the D / U field is set to 0, the MSB (most significant bit) of this field can be considered a reserved bit, and the remaining 6 bits can be used to express the upper layer signaling UL-TCIState-Id. The maximum number of TCI states that can be activated can be 8 for a joint TCI state and 16 for separate DL or UL TCI states.

[0126] - R: Indicates reserved bit and can be set to 0.

[0127] For the MAC-CE structure of FIG. 5 described above, the terminal can include the third octet including the P1, P2, ... P8 fields in FIG. 5 in the MAC-CE structure, regardless of whether unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint or separate. In this case, the terminal can perform TCI state activation using the fixed MAC-CE structure regardless of the upper layer signaling set by the base station. As another example, for the MAC-CE structure of FIG. 5 described above, the terminal can omit the third octet including the P1, P2, ... P8 fields in FIG. 5 when unifiedTCI-StateType-r17 in MIMOparam-r17 in ServingCellConfig, which is an upper layer signaling, is set to joint. In this case, the terminal can save up to 8 bits of the payload of the corresponding MAC-CE according to the upper layer signaling set by the base station. In addition, all D / U fields located from the fourth octet to the first bit in Fig. 5 can be regarded as R fields, and all corresponding R fields can be set to 0 bits.

[0128] [PDCCH: DCI related]

[0129] Next, we will specifically explain downlink control information (DCI) in 5G systems.

[0130] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or downlink data (or physical downlink shared channel (PDSCH)) is transmitted from a base station to a terminal via DCI. The terminal can monitor a DCI format for fallback and a DCI format for non-fallback for the PUSCH or PDSCH. The fallback DCI format can be composed of fixed fields defined between the base station and the terminal, and the non-fallback DCI format can include configurable fields.

[0131] DCI can be transmitted through the Physical Downlink Control Channel (PDCCH) after going through the channel coding and modulation process. A Cyclic Redundancy Check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with a Radio Network Temporary Identifier (RNTI) corresponding to the identity of the UE. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control command, or random access response. That is, the RNTI is not transmitted explicitly, but is included in the CRC calculation process. When the UE receives a DCI message transmitted on the PDCCH, it verifies the CRC using the assigned RNTI. If the CRC verification result is correct, the UE can determine that the message was transmitted to the UE.

[0132] For example, a DCI scheduling a PDSCH for System Information (SI) may be scrambled with SI-RNTI. A DCI scheduling a PDSCH for a Random Access Response (RAR) message may be scrambled with RA-RNTI. A DCI scheduling a PDSCH for a Paging message may be scrambled with P-RNTI. A DCI notifying a Slot Format Indicator (SFI) may be scrambled with SFI-RNTI. A DCI notifying a Transmit Power Control (TPC) may be scrambled with TPC-RNTI. A DCI scheduling a UE-specific PDSCH or PUSCH may be scrambled with C-RNTI (Cell RNTI).

[0133] DCI format 0_0 can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 4] below.

[0134]

[0135] DCI format 0_1 ​​can be used as a fallback DCI for scheduling PUSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 0_1 ​​with the CRC scrambled with C-RNTI can include, for example, the information in [Table 5] below.

[0136]

[0137]

[0138] DCI format 1_0 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_0 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 6] below.

[0139]

[0140] DCI format 1_1 can be used as a fallback DCI for scheduling PDSCH, in which case the CRC can be scrambled with C-RNTI. DCI format 1_1 with the CRC scrambled with C-RNTI can include, for example, the information in [Table 7] below.

[0141]

[0142] [PDCCH: CORESET, REG, CCE, Search Space]

[0143] Below, the downlink control channel in a 5G communication system will be described in more detail with reference to drawings.

[0144] FIG. 6 is a diagram illustrating an example of a control region (Control Resource Set, CORESET) in which a downlink control channel is transmitted in a 5G wireless communication system.

[0145] FIG. 6 illustrates an example in which two control regions (Control Region #1 (601), Control Region #2 (602)) are set within a UE bandwidth part (610) in the frequency axis and within one slot (620) in the time axis. The control regions (601, 602) can be set to specific frequency resources (603) within the entire UE bandwidth part (610) in the frequency axis. The time axis can be set to one or more OFDM symbols, which can be defined as the control region length (Control Resource Set Duration, 604). Referring to the example illustrated in FIG. 6, Control Region #1 (601) is set to a control region length of two symbols, and Control Region #2 (602) is set to a control region length of one symbol.

[0146] In the aforementioned 5G, the control region can be established by the base station to the terminal via higher-layer signaling (e.g., system information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Establishing a control region for the terminal means providing information such as the control region identifier, the frequency location of the control region, and the symbol length of the control region. For example, this information may include the information in [Table 8] below.

[0147]

[0148] In [Table 8], the tci-StatesPDCCH (simply named TCI (Transmission Configuration Indication) state) configuration information may include information on one or more SS (Synchronization Signal) / PBCH (Physical Broadcast Channel) block indices or CSI-RS (Channel State Information Reference Signal) indices that are in a QCL (Quasi Co Located) relationship with the DMRS transmitted in the corresponding control region.

[0149] FIG. 7 is a diagram illustrating the structure of a downlink control channel in a wireless communication system according to one embodiment of the present disclosure.

[0150] According to FIG. 7, the basic unit of time and frequency resources constituting the control channel can be referred to as a REG (Resource Element Group, 703), and the REG (703) can be defined as 1 OFDM symbol (701) on the time axis and 1 PRB (Physical Resource Block, 702) on the frequency axis, i.e., 12 subcarriers. The base station can concatenate REGs (703) to form a downlink control channel allocation unit.

[0151] As illustrated in FIG. 7, if the basic unit to which a downlink control channel is allocated in 5G is called a CCE (Control Channel Element, 704), 1 CCE (704) can be composed of multiple REGs (703). Taking the REG (703) illustrated in FIG. 7 as an example, the REG (703) can be composed of 12 REs, and if 1 CCE (704) is composed of 6 REGs (703), 1 CCE (704) can be composed of 72 REs. When a downlink control region is set, the region can be composed of multiple CCEs (704), and a specific downlink control channel can be mapped to one or multiple CCEs (704) and transmitted according to the aggregation level (AL) within the control region. CCEs (704) within the control area are distinguished by numbers, and the numbers of the CCEs (704) can be assigned according to a logical mapping method.

[0152] The basic unit of the downlink control channel illustrated in FIG. 7, that is, the REG (703), may include both the REs to which the DCI is mapped and the areas to which the DMRS (705), which is a reference signal for decoding the REs, is mapped. As shown in FIG. 7, three DMRSs (705) may be transmitted within one REG (703). The number of CCEs required to transmit the PDCCH may be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs may be used to implement link adaptation of the downlink control channel. For example, when AL = L, one downlink control channel may be transmitted through L CCEs. The terminal must detect a signal without knowing information about the downlink control channel, and a search space representing a set of CCEs is defined for blind decoding. A search space is a set of downlink control channel candidates (CCEs) that a terminal must attempt to decode at a given aggregation level. Since there are multiple aggregation levels, each of which can be a set of 1, 2, 4, 8, or 16 CCEs, a terminal can have multiple search spaces. A search space set can be defined as the set of search spaces at all configured aggregation levels.

[0153] Search spaces can be categorized into common search spaces and UE-specific search spaces. A certain group of UEs, or all UEs, can search the common search space of the PDCCH to receive cell-common control information, such as dynamic scheduling of system information or paging messages. For example, PDSCH scheduling allocation information for transmitting SIBs, including cell operator information, can be received by searching the common search space of the PDCCH. In the case of the common search space, since a certain group of UEs, or all UEs, must receive the PDCCH, it can be defined as a set of pre-arranged CCEs. Scheduling allocation information for UE-specific PDSCH or PUSCH can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined UE-specifically as a function of the UE's identity and various system parameters.

[0154] In 5G, parameters for the search space for PDCCH can be configured from the base station to the terminal via higher layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station can configure the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the monitoring occasion for each symbol within the slot for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the corresponding search space, the control region index to be monitored for the search space, etc. to the terminal. For example, the information in [Table 9] below can be included.

[0155]

[0156]

[0157] Depending on the configuration information, the base station may configure one or more search space sets for the terminal. In some embodiments, the base station may configure search space set 1 and search space set 2 for the terminal, and may configure the terminal to monitor DCI format A scrambled with X-RNTI in search space set 1 in a common search space, and may configure the terminal to monitor DCI format B scrambled with Y-RNTI in search space set 2 in a terminal-specific search space.

[0158] According to the configuration information, one or more search space sets may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as terminal-specific search spaces.

[0159] In the common search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these.

[0160] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0161] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0162] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0163] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0164] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0165] In a terminal-specific search space, the following combinations of DCI formats and RNTIs can be monitored. Of course, the examples below are not limited to these examples.

[0166] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0167] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0168] The RNTIs specified may follow the definitions and uses below.

[0169] C-RNTI (Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0170] TC-RNTI (Temporary Cell RNTI): For terminal-specific PDSCH scheduling purposes

[0171] CS-RNTI (Configured Scheduling RNTI): Used for terminal-specific PDSCH scheduling that is set semi-statically.

[0172] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase.

[0173] P-RNTI (Paging RNTI): Used for scheduling PDSCH where paging is transmitted.

[0174] SI-RNTI (System Information RNTI): Used for scheduling PDSCH where system information is transmitted.

[0175] INT-RNTI (Interruption RNTI): Used to indicate whether pucturing is in progress for PDSCH.

[0176] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to indicate power control commands for PUSCH.

[0177] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to indicate power control commands for PUCCH.

[0178] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to indicate power control commands for SRS.

[0179] The aforementioned specified DCI formats may follow the definitions in [Table 10] below.

[0180] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commnands for SRS transmissions by one or more UEs

[0181] In 5G, the search space of aggregation level L in the control region p and search space set s can be expressed as in [Mathematical Formula 1] below.

[0182]

[0183] In a 5G system, since multiple search space sets can be set with different parameters (e.g., parameters in [Table 9]), the set of search space sets monitored by a terminal at each point in time can be different. For example, if search space set #1 is set with an X-slot period and search space set #2 is set with a Y-slot period and X and Y are different, the terminal can monitor both search space set #1 and search space set #2 in a specific slot, or can monitor either search space set #1 or search space set #2 in a specific slot.

[0184] [SRS related]

[0185] 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.

[0186] - srs-ResourceSetId: SRS resource set index

[0187] - srs-ResourceIdList: A set of SRS resource indices referenced in the SRS resource set.

[0188] - 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.

[0189] - 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'.

[0190] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for adjusting the transmission power of the SRS resource referenced in the SRS resource set.

[0191] 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.

[0192] 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.

[0193] 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.

[0194] 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.

[0195] 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 can be applied by applying the 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 can refer to the spatial relation information configured in the SRS resource, or can refer to the associated CSI-RS information configured in the SRS resource set including the SRS resource. The UE can transmit the SRS resource within the activated uplink BWP for the aperiodic SRS resource triggered through the DCI.

[0196] 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 SRS resource to be transmitted 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.

[0197]

[0198]

[0199] The spatialRelationInfo setting information in [Table 11] refers to a single reference signal and applies the beam information of that reference signal to the beam used for the corresponding SRS transmission. For example, the spatialRelationInfo setting may include information such as [Table 12] below.

[0200]

[0201] Referring to the spatialRelationInfo setting, you can set the index of the reference signal to be referenced in order to use the beam information of a specific reference signal, that is, the SS / PBCH block index, CSI-RS index, or SRS index. The upper signaling referenceSignal is configuration information indicating which beam information of which reference signal will be referenced for the corresponding SRS transmission, 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. If 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.

[0202] [SRS: Antenna switching]

[0203] Below, SRS for antenna switching is described.

[0204] 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.

[0205] 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.

[0206] As described above, if the 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 the value can be as follows. In the following, 'mTnR' can mean the terminal capability that supports transmission through m antennas and reception through n antennas.

[0207] - 't1r2': Terminal capability report value indicating that the terminal is capable of 1T2R operation.

[0208] - 't1r1-t1r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 1T2R operation.

[0209] - 't2r4': Terminal capability report value indicating that the terminal is capable of 2T4R operation.

[0210] - 't1r4': Terminal capability report value indicating that the terminal is capable of 1T4R operation.

[0211] - 't1r6': Terminal capability report value indicating that the terminal is capable of 1T6R operation.

[0212] - 't1r8': Terminal capability report value indicating that the terminal is capable of 1T8R operation.

[0213] - 't2r6': Terminal capability report value indicating that the terminal is capable of 2T6R operation.

[0214] - 't2r8': Terminal capability report value indicating that the terminal is capable of 2T8R operation.

[0215] - 't4r8': Terminal capability report value indicating that the terminal is capable of 4T8R operation.

[0216] - 't1r1-t1r2-t1r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, or 1T4R operation.

[0217] - 't1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T4R or 2T4R operation.

[0218] - 't1r1-t1r2-t2r2-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, or 2T4R operation.

[0219] - 't1r1-t1r2-t2r2-t1r4-t2r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 1T2R, 2T2R, 1T4R, or 2T4R operation.

[0220] - 't1r1': Terminal capability report value indicating that the terminal is capable of 1T1R operation.

[0221] - 't2r2': Terminal capability report value indicating that the terminal is capable of 2T2R operation.

[0222] - 't1r1-t2r2': Terminal capability report value indicating that the terminal is capable of 1T1R or 2T2R operation.

[0223] - 't4r4': Terminal capability report value indicating that the terminal is capable of 4T4R operation.

[0224] - 't1r1-t2r2-t4r4': Terminal capability report value indicating that the terminal is capable of 1T1R, 2T2R, or 4T4R operation.

[0225] [1T2R]

[0226] For the 1T2R operation of the terminal, upper layer signaling from the base station for at least one combination of the following items can be set, and operation can be performed accordingly.

[0227] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0228] ■ If the terminal reports only srs-AntennaSwitching2SP-1Periodic-r17,

[0229] ○ 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

[0230] ○ 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.

[0231] ○ 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.

[0232] ○ For the above, each SRS resource set may include two SRS resources transmitted in different OFDM symbols.

[0233] ○ 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.

[0234] ● 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.

[0235] ■ If the terminal reports only srs-ExtensionAperiodicSRS-r17,

[0236] ○ 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

[0237] ○ 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.

[0238] ○ 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.

[0239] ● 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.

[0240] ○ 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.

[0241] ● 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.

[0242] ○ 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.

[0243] ● 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.

[0244] ■ If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive from the base station up to two different SRS resource sets (for example, 0, 1, or 2) in the upper layer signaling SRS-ResourceSet, where the resourceType value is 'periodic' or 'semi-persistent'. For example, the terminal can receive from the base station one of the following:

[0245] ○ SRS resource sets with resourceType values ​​of 'periodic' or 'semi-persistent' are not set within the upper layer signaling SRS-ResourceSet.

[0246] ○ One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0247] ○ One SRS resource set with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0248] ○ 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.

[0249] ○ 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.

[0250] ○ 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.

[0251] ● 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.

[0252] ■ 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' in the upper layer signaling SRS-ResourceSet from the base station, and up to one SRS resource set with a resourceType value of 'periodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0253] ○ 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.

[0254] ○ 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.

[0255] ● 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.

[0256] ■ If the terminal does not report only srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station at most one (for example, 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:

[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] ○ Regarding 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.

[0260] ● 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.

[0261] ■ If the terminal reports only srs-ExtensionAperiodicSRS-r17, the terminal can 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 can receive from the base station one of the following:

[0262] ○ The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0263] ○ One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0264] ○ Two SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0265] ○ Regarding 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.

[0266] ● 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.

[0267] ○ 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.

[0268] ● 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.

[0269] - If the terminal does not report both the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0270] ■ 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.

[0271] ■ 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.

[0272] ○ 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.

[0273] [2T4R]

[0274] 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.

[0275] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0276] ■ If the terminal reports only srs-AntennaSwitching2SP-1Periodic-r17,

[0277] ○ 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

[0278] ○ 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.

[0279] ○ 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.

[0280] ○ For the above, each SRS resource set may include two SRS resources transmitted in different OFDM symbols.

[0281] ○ Regarding the above, each SRS resource within each SRS resource set can be configured with two SRS ports, and the two SRS ports of each SRS resource within each SRS resource set can be connected to different terminal antenna ports.

[0282] ● 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.

[0283] ■ If the terminal reports only srs-ExtensionAperiodicSRS-r17,

[0284] ○ 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

[0285] ○ 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.

[0286] ○ 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.

[0287] ● 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.

[0288] ○ 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.

[0289] ○ 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.

[0290] ● 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.

[0291] ■ If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive from the base station up to two different SRS resource sets (for example, 0, 1, or 2) in the upper layer signaling SRS-ResourceSet, where the resourceType value is 'periodic' or 'semi-persistent'. For example, the terminal can receive from the base station one of the following:

[0292] ○ SRS resource sets with resourceType values ​​of 'periodic' or 'semi-persistent' are not set within the upper layer signaling SRS-ResourceSet.

[0293] ○ One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0294] ○ One SRS resource set with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0295] ○ 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.

[0296] ○ 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.

[0297] ○ 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.

[0298] ● 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.

[0299] ■ 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.

[0300] ○ 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.

[0301] ○ 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.

[0302] ● 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.

[0303] ■ If the terminal does not report srs-ExtensionAperiodicSRS-r17, the terminal may receive from the base station at most one (for example, 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:

[0304] ○ The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0305] ○ One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0306] ○ Regarding 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.

[0307] ● 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.

[0308] ■ If the terminal reports srs-ExtensionAperiodicSRS-r17, the terminal can 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 can receive from the base station one of the following:

[0309] ○ The SRS resource set with the resourceType value of 'aperiodic' is not set within the upper layer signaling SRS-ResourceSet.

[0310] ○ One SRS resource set with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0311] ○ Two SRS resource sets with a resourceType value of 'aperiodic' within the upper layer signaling SRS-ResourceSet

[0312] ○ Regarding 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.

[0313] ● For example, the SRS resource set may include first and second SRS resources each consisting of two SRS ports, the two SRS ports of the first and second SRS resources may be connected to different terminal antenna ports, 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.

[0314] ○ 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.

[0315] ● 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.

[0316] - If the terminal does not report both the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17 and srs-ExtensionAperiodicSRS-r17.

[0317] ■ 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.

[0318] ■ 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.

[0319] ○ 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.

[0320] [1T4R]

[0321] 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.

[0322] - If the terminal reports some or all of the terminal capability reports srs-AntennaSwitching2SP-1Periodic-r17, srs-ExtensionAperiodicSRS-r17, and srs-OneAP-SRS-r17.

[0323] ■ If the terminal does not report srs-AntennaSwitching2SP-1Periodic-r17, the terminal can receive from the base station at most one (for example, 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 can receive from the base station one of the following:

[0324] ○ SRS resource sets with resourceType values ​​of 'periodic' or 'semi-persistent' are not set within the upper layer signaling SRS-ResourceSet.

[0325] ○ One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0326] ○ One SRS resource set with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0327] ○ 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.

[0328] ● 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.

[0329] ■ 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.

[0330] ○ 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.

[0331] ○ 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.

[0332] ● 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.

[0333] ■ 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.

[0334] ○ If the terminal does not report both srs-ExtensionAperiodicSRS-r17 and srs-OneAP-SRS-r17, the terminal can receive 0 or 2 SRS resource sets with a resourceType value of 'aperiodic' in the upper layer signaling SRS-ResourceSet from the base station.

[0335] ○ 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.

[0336] ○ 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.

[0337] ○ 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 the upper layer signaling SRS-ResourceSet from the base station.

[0338] ○ Regarding the above, if 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 a different terminal antenna port.

[0339] ● 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.

[0340] ○ Regarding the above, if two SRS resource sets are set,

[0341] ● 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.

[0342] ● 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.

[0343] ● 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.

[0344] ● 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.

[0345] ● 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 different slot 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 or different from each other.

[0346] ○ Regarding the above, if 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.

[0347] ● 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.

[0348] - 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,

[0349] ■ 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.

[0350] ○ 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.

[0351] ● 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.

[0352] ■ The terminal can 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 set, some or all of the following may be considered.

[0353] ○ 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.

[0354] ○ 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.

[0355] ○ 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.

[0356] ○ 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.

[0357] ○ 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 each 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. 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 or different from each other.

[0358] - For the above, if multiple SRS resource sets are set (for example, if 2 or 4 SRS resource sets are set)

[0359] ■ 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].

[0360] ○ The above [power control parameter constraints] can be applied only 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.

[0361] ○ The above [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.

[0362] ■ 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].

[0363] ○ 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 if 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.

[0364] ○ 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 if a terminal receives an aperiodic SRS trigger for a specific aperiodic SRS trigger state from the base station through DCI, and if 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.

[0365] ○ 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.

[0366] ○ 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.

[0367] ■ The terminal can expect the slotOffset, which is 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].

[0368] ○ The above [slot offset information] 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.

[0369] [1T1R, 2T2R, 4T4R]

[0370] 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.

[0371] - 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.

[0372] - If 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.

[0373] ■ 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.

[0374] ○ 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.

[0375] Up to 2 SRS resource sets

[0376] - 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.

[0377] - 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.

[0378] [1T6R]

[0379] 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.

[0380] - 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.

[0381] - 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.

[0382] ■ 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.

[0383] ■ If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, which is a terminal capability report, 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.

[0384] ■ 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.

[0385] - 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.

[0386] ■ If 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.

[0387] ■If 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.

[0388] ○ For example, the terminal may include first to third SRS resources in the first SRS resource set, and 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.

[0389] ○ As another example, it may be possible for the first and second SRS resource sets to include one (e.g., the first SRS resource) and five (e.g., the second to sixth SRS resources) SRS resources, respectively, and other combinations may not be excluded.

[0390] ■ If 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 locations in the same slot, and SRS transmission 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.

[0391] ○ 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. 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 and fourth SRS resources in the second SRS resource set may be performed at 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. Transmission for the fifth and sixth SRS resources in the third SRS resource set may be performed at the 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.

[0392] ○ 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.

[0393] [1T8R]

[0394] 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.

[0395] - 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.

[0396] - 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.

[0397] ■ 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.

[0398] ■ If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, which is a terminal capability report, 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.

[0399] ■ 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.

[0400] - 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.

[0401] ■ If two SRS resource sets are configured, a total of eight SRS resources can be divided and included in the two SRS resource sets, each SRS resource can be configured with one SRS port, all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, SRS transmission 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.

[0402] ○ 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.

[0403] ○As another example, it may be possible for the first and second SRS resource sets to include one (e.g., the first SRS resource) and seven (e.g., the second to eighth SRS resources) SRS resources, respectively, and other combinations may not be excluded.

[0404] ■ If 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 transmission 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.

[0405] ○ 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.

[0406] ○ 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.

[0407] ■ If 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 locations in the same slot, and SRS transmission for different SRS resource sets can be performed at the same or different OFDM symbol locations in different slots, and 1 SRS port of each SRS resource can be connected to a different terminal antenna port.

[0408] ○ 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. 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 a 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 at the third and fourth OFDM symbol positions in a second slot, and the third and fourth OFDM symbol positions may be different from each other. Transmission for the fifth and sixth SRS resources in the third SRS resource set may be performed at the 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.

[0409] ○ 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.

[0410] [2T6R]

[0411] 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.

[0412] - The terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station, and one SRS resource set can include three SRS resources. In addition, each SRS resource can be composed of two SRS ports, and each SRS resource can be transmitted in a different OFDM symbol position within the same or different slots. In addition, the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0413] - 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.

[0414] ■ 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.

[0415] ■ If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, which is a terminal capability report, 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.

[0416] ■ 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.

[0417] - 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.

[0418] ■ If 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.

[0419] ■ If 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 configured with two SRS ports. In addition, 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. In addition, the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0420] ○ 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.

[0421] ○ As another example, it may be possible for the first and second SRS resource sets to include 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.

[0422] ■ If three SRS resource sets are configured, 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. In addition, all SRS resources in each SRS resource set can be transmitted in different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed in the same or different OFDM symbol positions in different slots. In addition, the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0423] ○ 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.

[0424] [2T8R]

[0425] For the 2T8R 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.

[0426] - The terminal can receive up to one (i.e., 0 or 1) SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet from the base station. In addition, 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 in a different OFDM symbol position within the same or different slots. In addition, the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0427] - 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.

[0428] ■ 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.

[0429] ■ If the terminal reports srs-AntennaSwitching2SP-1Periodic-r17, which is a terminal capability report, 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.

[0430] ■ 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.

[0431] - 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.

[0432] ■ If 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.

[0433] ■ If two SRS resource sets are configured, a total of four SRS resources can be divided and included in the two SRS resource sets, each SRS resource can be composed of two SRS ports, all SRS resources in each SRS resource set can be transmitted at different OFDM symbol locations in the same slot, SRS transmission 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.

[0434] ○ 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.

[0435] ○ As another example, it may be possible for the first and second SRS resource sets to include one (e.g., the first SRS resource) and three (e.g., the second to fourth SRS resources) SRS resources, respectively, and other combinations may not be excluded.

[0436] ■ If 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. In addition, all SRS resources in each SRS resource set can be transmitted in different OFDM symbol positions in the same slot, and SRS transmissions for different SRS resource sets can be performed in the same or different OFDM symbol positions in different slots. In addition, the two SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0437] ○ For example, the terminal may include first and second SRS resources in a first SRS resource set, a third SRS resource in a second SRS resource set, and a fourth SRS resource in a 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.

[0438] ○ As another example, it may be possible for the first, second, and third SRS resource sets to each include 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.

[0439] ■ If 4 SRS resource sets are configured, a total of 4 SRS resources can be divided and included in the 4 SRS resource sets, and each SRS resource can be configured with 2 SRS ports. In addition, all SRS resources in each SRS resource set can be transmitted in different OFDM symbol positions in the same slot, and SRS transmission for different SRS resource sets can be performed in the same or different OFDM symbol positions in different slots. In addition, the 2 SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0440] ○ 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 transmission 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.

[0441] [4T8R]

[0442] For the 4T8R 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.

[0443] - If the terminal does not report the terminal capability report srs-AntennaSwitching2SP-1Periodic-r17,

[0444] ■ The terminal can receive up to two different SRS resource sets (e.g., 0, 1, or 2) from the base station, where the resourceType value is '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.

[0445] ○ SRS resource sets with resourceType values ​​of 'periodic' or 'semi-persistent' are not set within the upper layer signaling SRS-ResourceSet.

[0446] ○ One SRS resource set with a resourceType value of 'periodic' within the upper layer signaling SRS-ResourceSet

[0447] ○ One SRS resource set with a resourceType value of 'semi-persistent' within the upper layer signaling SRS-ResourceSet

[0448] ○ 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.

[0449] ○ Regarding the above, each SRS resource set can include two SRS resources, and each SRS resource can be configured with four SRS ports. In addition, 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.

[0450] - If 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.

[0451] ■ 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.

[0452] - 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.

[0453] ■ If 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.

[0454] ■ If two SRS resource sets are configured, 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. In addition, 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. In addition, the four SRS ports of each SRS resource can be connected to different terminal antenna ports.

[0455] ○ 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.

[0456] 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 13] below.

[0457] μΔf=2 μ ㆍ15[kHz]Y[symbol]01511301260131202

[0458] In [Table 13], μ represents numerology, Δf represents subcarrier spacing, and Y may represent the number of OFDM symbols representing the guard interval, i.e., the length of the guard interval. Referring to [Table 13], the guard interval may be set based on the parameter μ that determines the numerology. In the guard interval, the terminal may be set not to transmit any other signals, and the guard interval may be set to be used entirely for antenna switching.

[0459] For example, the guard interval may 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.

[0460] As another example, if a terminal has been 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 if 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 13] between the last OFDM symbol in which an SRS transmission is performed in 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 in 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.

[0461] - For such inter-slot guard intervals, similar to the guard interval between two SRS resources within the same slot 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 Y OFDM symbol interval.

[0462] - For such inter-slot guard intervals, 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 (all canceled) due to overlap with other signals, the terminal can determine that the inter-slot guard interval defined by Y OFDM symbols has been dropped (all canceled) by applying the same priority as the SRS transmissions before and after the guard interval. In addition, if the terminal determines that all SRS transmissions before and after the inter-slot guard interval have been dropped (i.e., all canceled), the terminal can perform uplink transmission in this inter-slot guard interval.

[0463] For all antenna switching methods described above, the terminal can expect that all SRS resources within all SRS resource sets in which the upper layer signaling within the SRS resource set is set to 'antennaSwitching' from the base station will be configured with the same number of SRS ports.

[0464] For the antenna switching method based on the above-described 1T24, 1T4R, 2T4R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R operations, the terminal may not expect that two or more SRS resource sets, of which the upper layer signaling usage from the base station is set to 'antennaSwitching', are set or triggered in the same slot.

[0465] For the antenna switching method based on the 1T1R, 2T2R, and 4T4R operations described above, the terminal may not expect that two or more SRS resource sets, in which the usage of the upper layer signaling from the base station is set to 'antennaSwitching', are set or triggered in the same OFDM symbol.

[0466] FIG. 8 is a diagram illustrating an SRS antenna switching operation according to an embodiment of the present disclosure.

[0467] 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 (800), and may be instructed to trigger aperiodic SRS for SRS resource set #0 (810) and SRS resource set #1 (820) through the PDCCH. At this time, the slot offset value for SRS resource set #0 (810) 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 after the slot in which the PDCCH is received (i.e., at slot #1). Additionally, the slot offset value for SRS resource set #1 (820) 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 after the slot in which the PDCCH is received (i.e., at slot #2).

[0468] SRS resource #0 (811) and SRS resource #1 (812) included in SRS resource set #0 (810) 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 (813). In addition, when transmitting for SRS resource #0 (830), the terminal can perform SRS transmission by connecting one SRS port to the first receiving antenna port (835) of the terminal, and when transmitting for SRS resource #1 (840), the terminal can perform SRS transmission by connecting one SRS port to the second receiving antenna port (845) of the terminal.

[0469] SRS resource #2 (821) and SRS resource #3 (822) included in SRS resource set #1 (820) are transmitted at different OFDM symbol positions within slot #1, and Y number of OFDM symbols may exist as a guard interval between SRS resources #2 and #3 (823). In addition, when transmitting for SRS resource #2 (850), the terminal can perform SRS transmission by connecting one SRS port to the third receiving antenna port (855) of the terminal, and when transmitting for SRS resource #3 (860), the terminal can perform SRS transmission by connecting one SRS port to the fourth receiving antenna port (865) of the terminal.

[0470] By connecting the above-described four SRS resources #0 to #3 to different receiving antenna ports of terminals 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.

[0471] [SRS: Carrier switching]

[0472] Next, we will explain SRS carrier switching. In a TDD system, SRS carrier switching is used to perform SRS transmission to support downlink channel estimation of the base station for supporting cells that do not have PUSCH / PUCCH transmission configured, 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 base station can estimate the downlink channel based on the uplink channel estimated through SRS. This has the advantage of requiring less overhead for downlink channel estimation through SRS-based channel recipocity compared to CSI-RS-based downlink channel estimation when the base station supports a large number of antennas but the terminal supports a relatively small number of antennas.

[0473] 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 in which 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), which 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.

[0474] 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.

[0475] 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 an uplink transmission scheduled for the source CC overlaps with an SRS transmission including the RF retuning time. If an uplink transmission scheduled for the source CC overlaps with an SRS transmission scheduled for the target CC (including the retuning time), 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.

[0476] - If the PUSCH or PUCCH and / or PRACH (physical random access channel) that includes one or more pieces of information from the source CC, including HARQ-ACK / positive SR (scheduling request) / RI (rank indicator) / CRI (CSI-RS resource indicator) / SSBRI (SS / PBCH block resource indicator), and the SRS transmission to the target CC overlap, the UE may not transmit the SRS of the target CC. That is, the scheduled uplink signal to the source CC may be transmitted without performing SRS carrier switching.

[0477] - 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.

[0478] - If the PUCCH or PUSCH and / or SRS including periodic or semi-persistent CSI consisting of only one or more pieces of information from 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) overlaps with the SRS transmission on the target CC, the UE may not transmit the PUCCH or PUSCH and / or SRS of the source CC. That is, the UE may transmit the SRS to the target CC by performing SRS carrier switching.

[0479] - 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.

[0480] When comparing the priorities between uplink transmissions of the source CC and SRS transmissions of the target CC, the time it takes the UE to receive and decode the DCI scheduling each transmission, the time it takes the UE 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 account. This is because once the UE prepares to transmit either the uplink transmission of the source CC or the SRS of the target CC, it cannot be canceled. For example, even if a DCI scheduling a high-priority uplink signal transmission to the source CC is received while the UE is preparing 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 terminal cancels one of the specific transmissions (uplink signal transmission from the source CC or SRS transmission from the target CC) by sending a symbol of carrier c1 (target CC). SRS transmission starts at the symbol of carrier c2 (source CC). For conflicting uplink transmissions, the above-described priority rules (priority rules between uplink transmissions of the source CC and SRS transmissions of the target CC) are applied, taking into account the conditions below.

[0481] - The last symbol of PDCCH and The interval between the symbols is at least N2 is greater than the sum of the last symbol of the PDCCH and DCI(s) must be received by the terminal such that the interval between them is at least N2 symbols. In this case, the DCI may correspond to both DCI scheduling uplink signal transmission on the source CC and DCI scheduling SRS transmission on the target CC.

[0482] - Semi-persistent CSI reporting or SRS transmission At least N2 symbols based on is active before an interval greater than the sum of It must be activated at least N2 symbols before the interval based on the reference. The transmission activated at this time may include both uplink transmission from the source CC and SRS transmission from the target CC.

[0483] Here Is = max{switchingTimeUL,switchingTimeDL}, and the time interval unit of the OFDM symbol is determined based on the smallest SCS (subcarrier spacing) among c1, c2, and the corresponding scheduling cell (if the overlapping uplink signal is not transmitted to the target CC or source CC). N2 represents the processing ability according to the capability of the terminal for the PUSCH preparation process time described later.

[0484] 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 a set symbol and slot that satisfies the following conditions.

[0485] - The set symbol and slot are values ​​that are later than the sum of the detailed conditions below.

[0486] ■ The maximum time interval among the time intervals equal to the number of N OFDM symbols for each cell containing Target CC c and DCI (or grant)

[0487] ■ Uplink or downlink RF retuning time defined by switchingTimeUL and switchingTimeDL of upper layer parameters SRS-SwitchingTimeNR

[0488] - 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.

[0489] If the above 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.

[0490] 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.

[0491] 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.

[0492] Figure 9 illustrates an example of SRS carrier switching.

[0493] In Fig. 9, DCI (901) received from target CC (900) can schedule SRS transmission (902) through SRS carrier switching. DCI (911) received from source CC (910) can schedule uplink transmission (912) that can overlap with SRS transmission (902). At this time, the transmission start symbol of SRS (903) at least N2(904) symbols and (906) Two DCIs must be received before the sum of (905). Additionally, the uplink transmission start symbol from the source CC At least two DCIs (915) must be received before N2 (914) symbols based on (913).

[0494] In Fig. 9, (907) is the time required for RF retuning from downlink to uplink to perform SRS carrier switching, and (908) is the time required for RF retuning from uplink to downlink after performing SRS carrier switching.

[0495] [Regarding terminal capability reporting]

[0496] 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.

[0497] A base station can transmit a UE capability inquiry message requesting capability reporting to a connected UE. The UE capability inquiry 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. Furthermore, in the case of the 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, while the UE capability inquiry message is typically transmitted initially after a UE is connected to the base station, the base station can request it under any conditions when necessary.

[0498] Upon receiving a UE capability report request from a base station, a terminal configures its UE capability based on the RAT type and band information requested from the base station. Below, we describe how a terminal configures UE capability in an NR system.

[0499] 1) If 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, it configures a candidate list of BCs for EN-DC and NR SA based on the bands requested to the base station via FreqBandList. In addition, the bands are prioritized in the order listed in FreqBandList.

[0500] 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 configured BC candidate list. This behavior can only occur when the LTE base station (eNB) requests the "eutra" capability.

[0501] 3) The terminal then removes fallback BCs from the configured BC candidate list. Here, a fallback BC is a BC obtained by removing at least one band corresponding to an SCell from a random BC. This step can be omitted because the BC before removing the band corresponding to at least one SCell can already cover the fallback BC. This step also applies to MR-DC, i.e., to LTE bands. The BCs remaining after this step become the final "candidate BC list."

[0502] 4) The terminal selects BCs to report by selecting BCs that match the requested RAT type from the final "candidate BC list" above. In this step, the terminal constructs the supportedBandCombinationList in a set order. That is, the terminal constructs BCs and UE capabilities to report in the order of the preset rat-Type (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" above include feature set combinations for both NR and EUTRA-NR BCs, and can be obtained from the feature set combinations of the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0503] 5) Also, if the requested rat Type is eutra-nr and influencing, featureSetCombinations are included in both containers: UE-MRDC-Capabilities and UE-NR-Capabilities. However, the feature set of NR is included only in UE-NR-Capabilities.

[0504] 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.

[0505] 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 MAC (medium access control) control element (MAC control element; MAC CE).

[0506] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied have a specific format, or including a specific indicator that indicates whether cooperative communication is applied, or scrambled with a specific RNTI by the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

[0507] 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.

[0508] 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.

[0509] 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 can be appropriately replaced with one of the above terms.

[0510] In the present disclosure, when determining whether cooperative communication is applied, the terminal may use various methods, such as having the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied have a specific format, or including a specific indicator that indicates whether cooperative communication is applied, or scrambled with a specific RNTI by the PDCCH(s) that allocate the PDSCH to which cooperative communication is applied, or assuming cooperative communication is applied in a specific section indicated by a higher layer. For the convenience of the following description, the case where the terminal receives the PDSCH to which cooperative communication is applied based on conditions similar to the above will be referred to as the NC-JT case.

[0511] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings. 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 also be applied to other communication systems with similar technical backgrounds or channel types. 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 are applicable to FDD and TDD systems.

[0512] 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.

[0513] In the following description of the present disclosure, upper layer signaling may be signaling corresponding to at least one or a combination of one or more of the following signaling.

[0514] - MIB (Master Information Block)

[0515] - SIB (System Information Block) or SIB

[0516] - RRC (Radio Resource Control)

[0517] - MAC (Medium Access Control) CE (Control Element)

[0518] In addition, L1 signaling may be signaling corresponding to at least one or a combination of one or more signaling methods using the physical layer channel or signaling below.

[0519] - PDCCH (Physical Downlink Control Channel)

[0520] - DCI (Downlink Control Information)

[0521] - UE-specific DCI

[0522] - Group common DCI

[0523] - Common DCI

[0524] - Scheduling DCI (e.g. DCI used for scheduling downlink or uplink data)

[0525] - Non-scheduled DCI (e.g. DCI not intended for scheduling downlink or uplink data)

[0526] - PUCCH (Physical Uplink Control Channel)

[0527] - UCI (Uplink Control Information)

[0528] 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.

[0529] 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.

[0530] 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.

[0531] <First embodiment: Method for changing the SRS path attenuation reference signal>

[0532] As one embodiment of the present disclosure, a method for changing a pathloss reference signal of a Sounding Reference Signal (SRS) is described. This embodiment can be operated in combination with other embodiments.

[0533] If the terminal does not receive the TCIState or UL-TCIState in the upper layer signaling dl-OrJoint-TCIStateList, the terminal can receive p0, alpha, and pathlossReferenceRS, which is a path loss reference signal, based on the upper layer signaling p0, alpha, and pathlossReferenceRS in the corresponding SRS resource set.

[0534] If the terminal has set the TCIState or UL-TCIState in the upper layer signaling dl-OrJoint-TCIStateList, the terminal can apply the TCI state indicated by the base station through DCI when transmitting the SRS resource in the corresponding SRS resource set to the base station. The terminal can receive parameters such as power control parameters p0, alpha, path loss reference signal, and closed loop index in the upper layer signaling TCI-State or TCI-UL-State from the base station. If the terminal has set the joint TCI state, the terminal can expect to always receive the path loss reference signal set in the upper layer signaling TCI-State. The terminal can expect to selectively receive the ul-powerControl-r17 set in the upper layer signaling TCI-State.

[0535] - If the terminal has p0AlphaSetforSRS set in the upper layer signaling ul-powerControl-r17

[0536] ■ If the terminal has set followUnifiedTCIstateSRS, which is an upper layer signaling, in the SRS resource set, the terminal can receive p0, alpha, and srs-PowerControlAdjustmentStates values ​​based on p0AlphaSetforSRS, which is an upper layer signaling associated with the TCIState or UL-TCIState indicated by the base station. pathlossReferenceRS, which is an upper layer signaling indicating a path loss reference signal, can be associated with the TCIState or UL-TCIState indicated by the base station, or provided based on pathlossReferenceRS-Id-r17, which is an upper layer signaling included in the TCIState or UL-TCIState.

[0537] ■ If the terminal does not receive the followUnifiedTCIstateSRS, which is an upper layer signaling, within the SRS resource set, the terminal may receive the p0, alpha, and srs-PowerControlAdjustmentStates values ​​based on the p0AlphaSetforSRS, which is an upper layer signaling associated with the TCIState or UL-TCIState set in the SRS resource with the lowest index within the SRS resource set. The pathlossReferenceRS, which is an upper layer signaling indicating the path loss reference signal, may be associated with the TCIState or UL-TCIState set in the SRS resource with the lowest index within the SRS resource set, or may be provided based on the pathlossReferenceRS-Id-r17, which is an upper layer signaling included in the TCIState or UL-TCIState.

[0538] The terminal can change the path loss reference signal that can be used for SRS transmission through the various MAC-CE signaling below. If the terminal receives the various MAC-CEs below from the base station, the terminal can apply the indication information activated by the base station through the MAC-CE 3 ms after the PUCCH transmission containing HARQ-ACK information for the MAC-CE reception.

[0539] FIG. 10 is a diagram illustrating an SRS path attenuation reference standard signal change MAC-CE according to an embodiment of the present disclosure.

[0540] The terminal can identify the SRS path attenuation reference signal change MAC-CE by checking the eLCID (extended logical channel ID) in the MAC subheader. The MAC-CE can have a fixed size of 24 bits.

[0541] - Serving cell ID (1000): This field indicates the ID of the serving cell containing the activated SRS resource set and can be expressed in 5 bits.

[0542] - BWP ID (1005): This field indicates UL BWP and can be a value indicated by one code point of the 2-bit BWP indicator field in DCI, which can be expressed in 2 bits.

[0543] - SRS Resource Set ID (1010): This field can indicate the ID of an SRS resource set that can be identified by the upper layer signaling SRS-ResourceSetId, and can be expressed in 4 bits.

[0544] - Pathloss Reference RS ID (1015): This field is a value indicating the ID of the path loss reference reference signal that can be identified by the upper layer signaling, PathlossReferenceRS-Id. This field can be used to change the ID of the path loss reference reference signal within the SRS resource set, and can be expressed in 6 bits.

[0545] - R: Indicates reserved bit and can be set to 0.

[0546] FIG. 11 is a diagram illustrating a MAC-CE for changing a TCI state of a semi-persistent, aperiodic SRS according to an embodiment of the present disclosure.

[0547] The terminal can identify the MAC-CE for TCI state changes of semi-persistent and aperiodic SRS by checking the eLCID (extended logical channel ID) in the MAC subheader. The MAC-CE can have a variable bit length.

[0548] - A / D (1130): This field indicates whether to activate or deactivate the semi-persistent SRS resource set, and can be expressed as 1 bit. If this field is 1, it indicates activation, and if not, it indicates deactivation. If the SRS resource set corresponding to the indicated SRS resource set ID is an aperiodic SRS resource set, the MAC entity of the terminal can ignore the field.

[0549] - SRS Resource Set's Cell ID (1100): This field indicates the ID of the serving cell including the semi-persistent or aperiodic SRS resource set indicated by the corresponding MAC-CE, and can be expressed with 5 bits. If the C field (1110) is indicated as 0, this field can also express the ID of the serving cell connected to the TCI states indicated by all TCI State IDi fields (1140) in the corresponding MAC-CE. That is, if the C field (1110) is 0, the ID of the serving cell including the SRS resource set indicated by the corresponding MAC-CE and the ID of the serving cell connected to the TCI states indicated by all TCI State IDi fields (1140) in the corresponding MAC-CE can be the same.

[0550] - SRS Resource Set's BWP ID (1105): This field indicates a UL BWP including a semi-persistent or aperiodic SRS resource set indicated by the corresponding MAC-CE, and can be a value indicated by one code point of a 2-bit BWP indicator field in the DCI, and can be expressed by 2 bits. If the C field (1110) is indicated as 0, this field can also express a BWP ID associated with TCI states indicated by all TCI State IDi fields (1140) in the corresponding MAC-CE. That is, if the C field (1110) is 0, the BWP ID including the SRS resource set indicated by the corresponding MAC-CE and the BWP ID associated with the TCI states indicated by all TCI State IDi fields (1140) in the corresponding MAC-CE can be the same.

[0551] - C (1110): This field may indicate the presence of multiple octets containing all TCI State Serving Cell ID fields (1125) and all TCI State BWP ID fields (1135) within the corresponding MAC-CE. If this field is set to 1, multiple octets containing all TCI State Serving Cell ID fields (1125) and TCI State BWP ID fields may be present, otherwise, multiple octets containing all TCI State Serving Cell ID fields (1125) and TCI State BWP ID fields may not be present, and the MAC entity of the terminal may ignore all TCI State Serving Cell ID fields (1125) and all TCI State BWP ID fields (1135).

[0552] - SUL (1115): This field can indicate whether the MAC-CE is applied to the NUL carrier or the SUL carrier. If this field is set to 1, the MAC-CE is applied to the SUL carrier, and if it is set to 0, it can be applied to the NUL carrier.

[0553] - SRS Resource Set ID (1120): This field can indicate the ID of a semi-persistent or aperiodic SRS resource set that can be identified by the upper layer signaling SRS-ResourceSetId, and can be expressed in 4 bits.

[0554] - TCI State Serving Cell IDi (1125): This field can indicate the ID of the serving cell in which the TCI state to be applied to the i-th SRS resource exists, and can be expressed in 5 bits.

[0555] - TCI State BWP IDi (1135): This field indicates a BWP for which a TCI state to be applied to the i-th SRS resource exists, and can be a value indicated by one code point of a 2-bit BWP indicator field in DCI, and can be expressed with 2 bits. If the terminal has received a joint setting of the upper layer signaling unifiedTCI-StateType for the serving cell indicated by the TCI State Serving Cell IDi field (1125), this field can indicate a DL BWP. If the terminal has received a separate setting of the upper layer signaling unifiedTCI-StateType for the serving cell indicated by the TCI State Serving Cell IDi field (1125), this field can indicate a UL BWP.

[0556] - TCI State IDi (1140): This field can indicate the ID of the TCI state that can be applied to the i-th SRS resource. TCI state ID0 indicates the TCI state of the first SRS resource, TCI state ID1 indicates the TCI state of the second SRS resource, and in this order, it can indicate which TCI state to apply to which SRS resource through the corresponding MAC-CE. If joint / DL TCI state is used, this field can indicate a TCI state ID that can be expressed in 7 bits that can be set through the upper layer signaling TCI-StateId. If separate DL & UL TCI states are used, the MSB (Most Significant Bit) of this field can be considered a reserved bit, and the remaining 6 bits can indicate one of the upper layer signaling UL-TCIState-Id. The length of this field is 7 bits. This field may be present if the corresponding MAC-CE activates a semi-persistent SRS resource set, i.e. the A / D field (1130) is set to 1, or if it indicates an aperiodic SRS resource set.

[0557] - R: Indicates reserved bit and can be set to 0.

[0558] FIG. 12 is a diagram illustrating MAC-CE for simultaneous TCI state change of SRS resource based on serving cell set according to one embodiment of the present disclosure.

[0559] The terminal can identify the MAC-CE for TCI state changes of semi-persistent and aperiodic SRS by checking the eLCID (extended logical channel ID) in the MAC subheader. The MAC-CE can have a variable bit length.

[0560] - SRS Resource's Cell ID (1200): This field indicates the ID of the serving cell that includes the semi-persistent or aperiodic SRS resource indicated by the corresponding MAC-CE, and can be expressed in 6 bits. If the C field (1210) is indicated as 0, this field can also express the ID of the serving cell connected to the TCI states indicated by all TCI State IDi fields (1240) in the corresponding MAC-CE. That is, if the C field (1210) is 0, the ID of the serving cell that includes the SRS resource set indicated by the corresponding MAC-CE and the ID of the serving cell connected to the TCI states indicated by all TCI State IDi fields (1240) in the corresponding MAC-CE can be the same. The serving cell indicated by this field can be set within the upper layer signaling simultaneousSpatial-UpdatedList1 or simultaneousSpatial-UpdatedList2, and the corresponding MAC-CE can be applied to all serving cells within simultaneousSpatial-UpdatedList1 or simultaneousSpatial-UpdatedList2.

[0561] - SRS Resource's BWP ID (1205): This field indicates a UL BWP including a semi-persistent or aperiodic SRS resource indicated by the corresponding MAC-CE, and can be a value indicated by one code point of a 2-bit BWP indicator field in the DCI, and can be expressed with 2 bits. If the C field (1210) is indicated as 0, this field can also express a BWP ID associated with TCI states indicated by all TCI State IDi fields (1240) in the corresponding MAC-CE. That is, if the C field (1210) is 0, the BWP ID including the SRS resource set indicated through the corresponding MAC-CE and the BWP ID associated with the TCI states indicated by all TCI State IDi fields (1240) in the corresponding MAC-CE can be the same.

[0562] - C (1210): This field may indicate the presence of multiple octets containing all TCI State Serving Cell ID fields (1225) and all TCI State BWP ID fields (1235) within the corresponding MAC-CE. If this field is set to 1, multiple octets containing all TCI State Serving Cell ID fields (1225) and TCI State BWP ID fields may be present, otherwise, multiple octets containing all TCI State Serving Cell ID fields (1225) and TCI State BWP ID fields may not be present, and the MAC entity of the terminal may ignore all TCI State Serving Cell ID fields (1225) and all TCI State BWP ID fields (1235).

[0563] - SRS Resource IDi (1215): This field can indicate the ID of a semi-persistent or aperiodic SRS resource that can be identified by the upper layer signaling SRS-ResourceId, and can be expressed in 6 bits.

[0564] - TCI State Serving Cell IDi (1225): This field can indicate the ID of the serving cell in which the TCI state to be applied to the i-th SRS resource exists, and can be expressed in 5 bits.

[0565] - TCI State BWP IDi (1235): This field indicates a BWP for which a TCI state to be applied to the i-th SRS resource exists, and can be a value indicated by one code point of a 2-bit BWP indicator field in DCI, and can be expressed with 2 bits. If the UE has received the unifiedTCI-StateType, which is a higher layer signaling, set to joint for the serving cell indicated by the TCI State Serving Cell IDi field (1225), this field can indicate a DL BWP. If the UE has received the unifiedTCI-StateType, which is a higher layer signaling, set to separate for the serving cell indicated by the TCI State Serving Cell IDi field (1225), this field can indicate a UL BWP.

[0566] - TCI State IDi (1240): This field can indicate the ID of the TCI state that can be applied to the i-th SRS resource. TCI state ID0 indicates the TCI state of the first SRS resource indicated by SRS Resource ID0, TCI state ID1 indicates the TCI state of the second SRS resource indicated by SRS Resource ID1, and in this order, it can indicate which TCI state to apply to which SRS resource through the corresponding MAC-CE. If joint / DL TCI state is used, this field can indicate a TCI state ID that can be expressed in 7 bits that can be set through the upper layer signaling TCI-StateId. If separate DL & UL TCI states are used, the MSB (Most Significant Bit) of this field can be considered a reserved bit, and the remaining 6 bits can indicate one of the upper layer signaling UL-TCIState-Id. The length of this field is 7 bits.

[0567] - R: Indicates reserved bit and can be set to 0.

[0568] The terminal can receive MAC-CE defined through Fig. 10 and understand the information when TCIState or UL-TCIState in dl-OrJoint-TCIStateList, which is an upper layer signaling, is not set.

[0569] When the terminal has set TCIState or UL-TCIState in dl-OrJoint-TCIStateList, which is an upper layer signaling, and has set followUnifiedTCIstateSRS, which is an upper layer signaling, for a specific SRS resource set, the terminal can receive MAC-CE defined through FIG. 10 and understand the information.

[0570] The terminal can receive MAC-CE defined through FIG. 10 and understand the information when the terminal has set TCIState or UL-TCIState in dl-OrJoint-TCIStateList, which is an upper layer signaling, and has not set followUnifiedTCIstateSRS, which is an upper layer signaling, for a specific SRS resource set.

[0571] When the terminal has set TCIState or UL-TCIState in dl-OrJoint-TCIStateList, which is an upper layer signaling, and has set followUnifiedTCIstateSRS, which is an upper layer signaling, for a specific SRS resource set, the terminal can receive MAC-CE defined through FIGS. 11 and 12 and understand the information.

[0572] When the terminal has set TCIState or UL-TCIState in dl-OrJoint-TCIStateList, which is an upper layer signaling, and has not set followUnifiedTCIstateSRS, which is an upper layer signaling, for a specific SRS resource set, the terminal can receive MAC-CE defined through FIGS. 11 and 12 and understand the information.

[0573] <Second embodiment: Method for simultaneously changing path attenuation reference signal and power control parameters for multiple SRS resource sets>

[0574] As one embodiment of the present disclosure, a method for simultaneously changing a path attenuation reference signal and power control parameters for multiple SRS resource sets is described. This embodiment may be operated in combination with other embodiments within the present disclosure.

[0575] If the terminal operates in 1T4R mode and receives multiple aperiodic SRS resource sets from the base station (for example, when two or four aperiodic SRS resource sets are configured), as described in [Power Control Parameter Constraints], the terminal can expect that the values ​​of each of the power control parameters p0, alpha, pathlossReferenceRS, and srs-PowerControlAdjustmentStates, which can be configured by upper layer signaling within each SRS resource set from the base station, are set to the same value for all SRS resource sets. That is, the terminal can expect that all multiple aperiodic SRS resource sets for which the upper layer signaling usage is configured as antenna switching have the same power control parameters. In this case, the constraints on the power control parameters may be applied only to the aperiodic SRS resource sets, or may be applied to all of the periodic, semi-persistent, and aperiodic SRS resource sets.

[0576] If the terminal performs antenna switching operation for one of 1T2R, 2T4R, 1T1R, 2T2R, 4T4R, 8T8R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R and receives multiple aperiodic SRS resource sets from the base station (for example, if 2 or 4 aperiodic SRS resource sets are configured), as described in [Power Control Parameter Constraints], the terminal can expect that the values ​​of each of the power control parameters p0, alpha, pathlossReferenceRS, and srs-PowerControlAdjustmentStates, which can be configured by upper layer signaling within each SRS resource set from the base station, are set to the same value for all SRS resource sets. That is, the terminal can expect that all multiple aperiodic SRS resource sets, of which usage, which is an upper layer signaling, is configured by antenna switching, have the same power control parameters. At this time, constraints on power control parameters may be applied only to aperiodic SRS resource sets, or may be applied to all periodic, semi-persistent, and aperiodic SRS resource sets.

[0577] If the terminal has received the TCIState or UL-TCIState in the upper layer signaling dl-OrJoint-TCIStateList, and the terminal performs antenna switching operation for one of 1T2R, 2T4R, 1T4R, 1T1R, 2T2R, 4T4R, 8T8R, 1T6R, 1T8R, 2T6R, 2T8R, 4T8R using multiple SRS resource sets,

[0578] - The terminal can expect that the upper layer signaling followUnifiedTCIstateSRS is set within each of all multiple SRS resource sets.

[0579] - If the UE has not set the upper layer signaling followUnifiedTCIstateSRS in each of the multiple SRS resource sets, the UE can expect that the TCIState or UL-TCIState set in the lowest indexed SRS resource in all SRS resource sets is associated with, or that p0, alpha, srs-PowerControlAdjustmentStates, and pathlossReferenceRS-Id-r17 included in the TCIState or UL-TCIState are set to be the same.

[0580] In this way, when a terminal is configured with multiple aperiodic SRS resource sets for antenna switching purposes, restrictions on power control parameters such as those described above may exist. Meanwhile, the MAC-CE defined through FIGS. 10 and 11 may have the following characteristics.

[0581] - The MAC-CE defined through FIG. 10 can change the path loss reference reference signal of a specific SRS resource set. Therefore, if a terminal is configured with multiple aperiodic SRS resource sets for antenna switching purposes as described above, the terminal can only change the path loss reference reference signal for one SRS resource set among the multiple aperiodic SRS resource sets through the MAC-CE. Therefore, the base station may need to transmit multiple MAC-CEs including the ID of the same path loss reference signal to the terminal. In this case, transmitting multiple MAC-CEs including very similar information from the base station to the terminal may be inefficient from the perspective of scheduling and resource utilization. In addition, when transmitting multiple MAC-CEs to a terminal, for example, if multiple MAC-CEs are included in multiple PDSCHs and transmitted, additional time delay may occur until all MAC-CEs are received, and the terminal may fail to receive some of the multiple PDSCHs including the multiple MAC-CEs, in which case a problem may arise in which the failed MAC-CEs must be retransmitted. To solve this problem, when multiple MAC-CEs are included in one PDSCH, the MAC-CE overhead within the PDSCH increases, so that the amount of resources that can include data to be transmitted to the terminal may be reduced, and a PDSCH including a small amount of time and frequency resources may not include the multiple MAC-CEs.

[0582] - The MAC-CE defined through FIG. 11 can change the TCI state for each SRS resource within a specific SRS resource set. Therefore, if a terminal is configured with multiple aperiodic SRS resource sets for antenna switching purposes as described above, the terminal can only change the path loss reference signal for one SRS resource set among the multiple aperiodic SRS resource sets through the MAC-CE, and thus may have a problem similar to the MAC-CE defined through FIG. 10.

[0583] Therefore, in order to solve the above-described problems of MAC-CE defined through FIGS. 10 and 11, the following methods may be considered.

[0584] [Method 2-1]

[0585] If the ID of the SRS resource set instructing the path attenuation reference reference signal change through the MAC-CE defined through FIG. 10 is one of the plurality of aperiodic SRS resource sets for antenna switching purposes, the terminal can equally apply the path attenuation reference reference signal change instruction of the corresponding MAC-CE to the remaining plurality of aperiodic SRS resource sets for antenna switching purposes. For example, if the terminal has received a 1T4R configuration from the base station, has been configured with four aperiodic SRS resource sets, and the IDs of the four SRS resource sets are 1 to 4, and has received an instruction to change the path attenuation reference reference signal ID to 10 for SRS resource set ID 1 through the MAC-CE defined through FIG. 10, the terminal can equally apply the corresponding MAC-CE to the remaining SRS resource sets IDs 2 to 4 to change the path attenuation reference reference signal ID to 10. That is, even if the terminal receives a MAC-CE indicating a change in the path attenuation reference signal for one SRS resource set, if the SRS resource set is one of multiple aperiodic SRS resource sets for antenna switching purposes, the same information can be applied to the remaining aperiodic SRS resource sets for antenna switching purposes.

[0586] [Method 2-2]

[0587] If the ID of the SRS resource set indicating the TCI state through the MAC-CE defined through FIG. 11 is one of the multiple aperiodic SRS resource sets for antenna switching purposes, the terminal can equally apply the TCI state change indication of each SRS resource within the SRS resource set to the remaining multiple aperiodic SRS resource sets for antenna switching purposes through the MAC-CE. For example, if a terminal receives a 1T4R configuration from a base station, configures four aperiodic SRS resource sets, and the IDs of the four SRS resource sets are 1 to 4, and receives an instruction to change the TCI state ID for the first SRS resource to 5 and the TCI state ID for the second SRS resource to 7 for SRS resource set ID 1 through MAC-CE defined in FIG. 11, the terminal can apply the MAC-CE in the same manner to the remaining SRS resource set IDs 2 to 4, and change the TCI state ID for the first SRS resource to 5 and the TCI state ID for the second SRS resource to 7. At this time, if the number of SRS resources included in specific SRS resource sets among the remaining multiple aperiodic SRS resource sets for antenna switching purposes is less than the number of SRS resources of the SRS resource set indicated by MAC-CE, the terminal can apply the MAC-CE information indicating the TCI state change only to the number of SRS resources existing for each SRS resource set.In addition, if the number of SRS resources included in specific SRS resource sets among the remaining multiple aperiodic SRS resource sets for antenna switching purposes is greater than the number of SRS resources in the SRS resource set indicated by MAC-CE, the terminal may apply MAC-CE information indicating a TCI state change equal to the number of SRS resources in the SRS resource set indicated by MAC-CE.

[0588] [Method 2-3]

[0589] If the ID of the SRS resource set indicating the TCI state through the MAC-CE defined in FIG. 11 is one of a plurality of aperiodic SRS resource sets for antenna switching purposes, the terminal can follow the TCI state change instruction for only the SRS resource with the lowest ID within the SRS resource set through the MAC-CE, and for the SRS resource with the lowest ID within the remaining plurality of aperiodic SRS resource sets for antenna switching purposes. For example, if a terminal receives a 1T4R configuration from a base station, and two aperiodic SRS resource sets are configured, and two SRS resources are included in each of the two SRS resource sets, and an instruction is received through MAC-CE defined in FIG. 11 to change the TCI state ID for the first SRS resource to 5 and for the second SRS resource to 7 for SRS resource set ID 1, the terminal can apply the TCI state change for the first SRS resource simultaneously to the SRS resource with the lowest ID among all remaining aperiodic SRS resource sets for antenna switching purposes, and the TCI state ID change for the second SRS resource can be applied only to the corresponding SRS resource set indicated through MAC-CE.

[0590] [Method 2-4]

[0591] The terminal may be expected to be set by the base station through upper layer signaling for one of [Method 2-1] to [Method 2-3], be activated through MAC-CE, be instructed through L1 signaling, be notified through a combination of at least one of upper layer signaling, MAC-CE, and L1 signaling, or be fixedly defined in the standard.

[0592] If the SRS resource set indicated by the MAC-CE received by the terminal from the base station is one of the plurality of aperiodic SRS resource sets for antenna switching purposes, the terminal can maintain the path loss reference signal or power control parameter of the plurality of aperiodic SRS resource sets for antenna switching purposes identically by using a combination of at least one of the above-described [Method 2-1] to [Method 2-4]. Accordingly, when the plurality of aperiodic SRS resource sets for antenna switching purposes are triggered by the SRS request field in the DCI from the base station, the terminal can determine the transmission power by using the same power control parameter when transmitting for all of the plurality of aperiodic SRS resource sets for antenna switching purposes.

[0593] A terminal may report to a base station as a terminal capability whether it can support at least one of [Method 2-1] to [Method 2-4]. The terminal capability may include at least one component indicating support for at least one combination of [Method 2-1] to [Method 2-4] within a single terminal capability, or may be defined as multiple different terminal capabilities. If a terminal capability for a specific method described above is not reported, it may be interpreted as support for another method. In addition, a terminal may support the corresponding function through another terminal capability report without directly reporting the terminal capability for [Method 2-1] to [Method 2-4]. Examples of such support may include support for an integrated TCI state and support for an aperiodic SRS resource set.

[0594] <Third embodiment: Method for simultaneously changing power control parameters for multiple SRS resources>

[0595] As one embodiment of the present disclosure, a method for simultaneously changing power control parameters for multiple SRS resources is described. This embodiment may be operated in combination with other embodiments within the present disclosure.

[0596] If the terminal operates in 1T4R mode and receives multiple aperiodic SRS resource sets from the base station (for example, when two or four aperiodic SRS resource sets are configured), as in [Power Control Parameter Constraints], the terminal can expect that the values ​​of the power control parameters p0, alpha, pathlossReferenceRS, and srs-PowerControlAdjustmentStates, which can be configured by upper layer signaling within each SRS resource set from the base station, are set to the same value for all SRS resource sets. That is, the terminal can expect that all multiple aperiodic SRS resource sets for which the upper layer signaling usage is configured as antenna switching have the same power control parameters. In this case, the constraints on the power control parameters may be applied only to the aperiodic SRS resource sets, or may be applied to all of the periodic, semi-persistent, and aperiodic SRS resource sets.

[0597] If the terminal performs antenna switching operation for one of 1T2R, 2T4R, 1T1R, 2T2R, 4T4R, 8T8R, 1T6R, 1T8R, 2T6R, 2T8R, and 4T8R and receives multiple aperiodic SRS resource sets from the base station (for example, if 2 or 4 aperiodic SRS resource sets are configured), as in [Power Control Parameter Constraints], the terminal can expect that the values ​​of each of the power control parameters p0, alpha, pathlossReferenceRS, and srs-PowerControlAdjustmentStates, which can be configured by upper layer signaling within each SRS resource set from the base station, are set to the same value for all SRS resource sets. That is, the terminal can expect that all multiple aperiodic SRS resource sets, of which usage, which is an upper layer signaling, is configured by antenna switching, have the same power control parameters. At this time, constraints on power control parameters may be applied only to aperiodic SRS resource sets, or may be applied to all periodic, semi-persistent, and aperiodic SRS resource sets.

[0598] In this way, when a terminal is configured with multiple aperiodic SRS resource sets for antenna switching purposes, restrictions on power control parameters as described above may exist.

[0599] Meanwhile, the MAC-CE defined through FIG. 12 can change the TCI state for multiple SRS resources, and can commonly apply such change to all serving cells included in a specific list set by upper layer signaling. At this time, if at least one of the multiple SRS resources indicated through the MAC-CE is an SRS resource with the lowest index in an aperiodic SRS resource set for antenna switching purposes, the UE can change the TCI state for the corresponding SRS resource, and apply the path loss reference signal included in the corresponding TCI state to the corresponding SRS resource.

[0600] If a terminal is configured with multiple aperiodic SRS resource sets for antenna switching purposes, and all of the SRS resource sets do not have the upper layer signaling followUnifiedTCIstateSRS configured, the terminal may apply the power control parameters included in the TCI state configured for the SRS resource with the lowest index within the SRS resource set to all SRS resources within the SRS resource set, as described above. At this time, if at least one of the multiple SRS resources indicated through the MAC-CE defined through FIG. 12 is the SRS resource with the lowest index within the aperiodic SRS resource set for antenna switching purposes, as described above, the terminal may change the TCI state for the corresponding SRS resource, and thereby all power control parameters applied to all SRS resources within the corresponding SRS resource set may be changed. In this case, based on the MAC-CE instruction, if a TCI state change is applied to the SRS resource of the lowest index within some of the multiple aperiodic SRS resource sets for antenna switching purposes, a situation may arise where the power control parameters of some of the multiple aperiodic SRS resource sets for antenna switching purposes may be different.

[0601] - To prevent this situation, all SRS resources with the lowest index in multiple aperiodic SRS resource sets for antenna switching purposes can be instructed to be included in multiple SRS resources that are instructed to change TCI state through the corresponding MAC-CE. However, in this case, among the multiple SRS resources indicated through the MAC-CE, the same TCI state can be instructed for all SRS resources with the lowest index in multiple aperiodic SRS resource sets for antenna switching purposes to indicate the same power control parameter, or even if the TCI state ID is different, the included power control parameters can only indicate the same TCI states. Therefore, the advantage of being able to independently indicate the TCI state applied to each different multiple SRS resources based on each octet in the MAC-CE is lost, and multiple TCI state fields become unnecessary.

[0602] - Another method is to force only one SRS resource among the SRS resources with the lowest index in the multiple aperiodic SRS resource sets for antenna switching purposes to be included in the multiple SRS resources that are instructed to change the TCI state through the corresponding MAC-CE, and then transmit multiple such MAC-CEs to match the same power control parameters for the multiple aperiodic SRS resource sets for antenna switching purposes. In this case, transmitting multiple MAC-CEs containing very similar information from the base station to the terminal may be inefficient in terms of scheduling and resource utilization. In addition, when transmitting multiple MAC-CEs to the terminal, for example, including multiple MAC-CEs in multiple PDSCHs, an additional time delay may occur until all MAC-CEs are received, and the terminal may fail to receive some of the multiple PDSCHs including the multiple MAC-CEs, in which case the problem of having to retransmit the failed MAC-CEs may occur. To solve this problem, if multiple MAC-CEs are included in one PDSCH, the MAC-CE overhead within the PDSCH increases, which may reduce the amount of resources that can contain data to be transmitted to the terminal, and a PDSCH that includes a small amount of time and frequency resources may not include the multiple MAC-CEs.

[0603] Therefore, to solve the above-described problems of MAC-CE defined through Fig. 12, the following methods may be considered.

[0604] [Method 3-1]

[0605] If the terminal, for the MAC-CE defined through FIG. 12, includes the SRS resources of the lowest indexes of each of the multiple aperiodic SRS resource sets for antenna switching purposes in the multiple SRS resources that are instructed to change the TCI state through the MAC-CE, the terminal may apply the same TCI state ID to each of the SRS resources, or apply TCI states including the same power control parameter even if the TCI state ID is different. In this case, by defining a new MAC-CE, if the same TCI state ID is applied to each of the corresponding SRS resources, all octets including the TCI state ID field can be deleted except for one. In addition, one reserved bit existing in the octet representing the SRS resource is defined as the F field. If the field is 1, it may mean that the SRS resource in the same octet is the SRS resource corresponding to the lowest SRS resource ID of a specific set among multiple aperiodic SRS resource sets for antenna switching, and if the field is 0, the terminal may understand it as meaning that the SRS resource does not correspond to the lowest SRS resource ID. Accordingly, if the TCI state ID field exists for the SRS resource ID in the first octet in which the F field is 1 in the MAC-CE, the TCI state ID field may be omitted for other SRS resource IDs in other octets in which the F field is 1 thereafter.In this case, since the TCI state change is indicated for the SRS resources of the lowest index of each of the multiple aperiodic SRS resource sets for antenna switching purposes through the corresponding MAC-CE, the power control parameters of the multiple aperiodic SRS resource sets for antenna switching purposes can all be applied equally.

[0606] [Method 3-2]

[0607] If, for a MAC-CE defined through FIG. 12, at least one of the lowest-indexed SRS resources of each of a plurality of aperiodic SRS resource sets for antenna switching purposes is included in the plurality of SRS resources that are instructed to change a TCI state through the MAC-CE, the terminal may apply the same TCI state to at least one of the lowest-indexed SRS resources of each of the plurality of aperiodic SRS resource sets for antenna switching purposes included in the MAC-CE, or may apply TCI states including the same power control parameter even if they have different TCI state IDs. In addition, the terminal may apply the same TCI state as that applied to the lowest-indexed SRS resources of each of the plurality of aperiodic SRS resource sets for antenna switching purposes included in the MAC-CE, or may apply TCI states including the same power control parameter even if they have different TCI state IDs, to the SRS resources of the lowest indexes of each of the plurality of aperiodic SRS resource sets for antenna switching purposes that are not included in the MAC-CE.

[0608] At this time, by defining a new MAC-CE, if the same TCI state ID is applied to at least one SRS resource among the lowest index SRS resources of each of the multiple aperiodic SRS resource sets for antenna switching included in the MAC-CE, all octets including the TCI state ID field can be deleted except one. In addition, by defining one reserved bit existing in the octet representing the SRS resource as an F field, if the field is 1, it can mean that the SRS resource in the same octet is the SRS resource corresponding to the lowest SRS resource ID of a specific set among the multiple aperiodic SRS resource sets for antenna switching, and if the field is 0, the terminal can understand it to mean that the SRS resource does not correspond to the lowest SRS resource ID. Therefore, if the TCI state ID field exists for the SRS resource ID in the first octet in which the F field is 1 within the MAC-CE, the TCI state ID field may be omitted for other SRS resource IDs in other octets in which the F field is 1 thereafter. In this case, since the TCI state change for the lowest index SRS resources of each of the multiple aperiodic SRS resource sets for antenna switching purposes is indicated through the MAC-CE, the power control parameters of the multiple aperiodic SRS resource sets for antenna switching purposes may all be applied equally.

[0609] [Method 3-3]

[0610] The terminal can expect that the SRS resource with the lowest index of the multiple aperiodic SRS resource sets for antenna switching purposes will not be instructed to change the TCI state through the MAC-CE defined in FIG. 12. That is, the base station may not include the SRS resource with the lowest index of the multiple aperiodic SRS resource sets for antenna switching purposes among the SRS resources included when configuring the MAC-CE. If the base station wants to change the TCI state of the SRS resource with the lowest index of the multiple aperiodic SRS resource sets for antenna switching purposes through the MAC-CE to the terminal, the base station can instruct the terminal through the MAC-CE defined in FIG. 11 based on the above [Method 2-2] or [Method 2-4].

[0611] [Method 3-4]

[0612] The terminal may be expected to be set by the base station through upper layer signaling for one of [Method 3-1] to [Method 3-4], be activated through MAC-CE, be instructed through L1 signaling, be notified through a combination of at least one of upper layer signaling, MAC-CE, and L1 signaling, or be fixedly defined in the standard.

[0613] If the SRS resource indicated by the MAC-CE received by the terminal from the base station is the SRS resource with the lowest index among the multiple aperiodic SRS resource sets for antenna switching purposes, the terminal can maintain the power control parameters of the multiple aperiodic SRS resource sets for antenna switching purposes identically by using at least one combination of the above-described [Method 3-1] to [Method 3-4]. Accordingly, when the multiple aperiodic SRS resource sets for antenna switching purposes are triggered by the SRS request field in the DCI from the base station, the terminal can determine the transmission power by using the same power control parameter for all transmissions for the multiple aperiodic SRS resource sets for antenna switching purposes.

[0614] A terminal may report to a base station as a terminal capability whether it can support at least one of [Method 3-1] to [Method 3-4]. The terminal capability may include at least one component indicating support for at least one combination of [Method 3-1] to [Method 3-4] within a single terminal capability, or may be defined as multiple different terminal capabilities. If a terminal capability for a specific method described above is not reported, it may be interpreted as support for another method. In addition, a terminal may support the corresponding function through another terminal capability report without directly reporting the terminal capability for [Method 2-1] to [Method 2-4]. Examples of such support may include support for an integrated TCI state and support for an aperiodic SRS resource set.

[0615] FIG. 13 is a diagram illustrating the operation of a terminal according to an embodiment of the present disclosure.

[0616] The terminal may transmit terminal capabilities to the base station (1300). At this time, the terminal capabilities reported from the terminal to the base station may include whether the terminal supports integrated TCI state, whether the terminal supports aperiodic SRS, whether the terminal supports SRS for antenna switching based on a number of transmit and receive antennas, whether the terminal supports at least one of [Method 2-1] to [Method 2-4], and whether the terminal supports at least one of [Method 3-1] to [Method 3-4].

[0617] The terminal can receive upper layer signaling from the base station (1305). At this time, the upper layer signaling that the terminal can receive from the base station may be related to the integrated TCI state, related to setting up an aperiodic SRS resource set for antenna switching, related upper layer signaling among [Method 2-1] to [Method 2-4], and related upper layer signaling among [Method 3-1] to [Method 3-4].

[0618] The terminal can receive a MAC-CE from the base station (1310). At this time, the terminal can receive the MAC-CE considered through a combination of at least one of [Method 2-1] to [Method 2-4] and [Method 3-1] to [Method 3-4] from the base station, and can maintain the same path attenuation reference signal and power control parameters for multiple aperiodic SRS resource sets for antenna switching purposes.

[0619] The terminal can receive an SRS request field from the base station (1315). At this time, it can determine which SRS resource set will be triggered based on the trigger state of the SRS request field.

[0620] The terminal can transmit an aperiodic SRS to the base station (1320). At this time, if multiple aperiodic SRS resource sets for antenna switching purposes are triggered, the terminal can transmit SRS resources within the SRS resource sets assuming the same power control parameters.

[0621] FIG. 14 is a diagram illustrating the operation of a base station according to an embodiment of the present disclosure.

[0622] The base station may transmit terminal capabilities from the terminal (1400). At this time, the terminal capabilities reported from the terminal to the base station may include whether the terminal supports integrated TCI state, whether the terminal supports aperiodic SRS, whether the terminal supports SRS for antenna switching based on a number of transmit and receive antennas, whether the terminal supports at least one of [Method 2-1] to [Method 2-4], and whether the terminal supports at least one of [Method 3-1] to [Method 3-4].

[0623] The base station can transmit upper layer signaling to the terminal (1405). At this time, the upper layer signaling that the terminal can receive from the base station may be related to the integrated TCI state, related to setting up an aperiodic SRS resource set for antenna switching, related upper layer signaling among [Method 3-1] to [Method 3-4], and related upper layer signaling among [Method 3-1] to [Method 3-4].

[0624] The base station can transmit a MAC-CE to the terminal (1410). At this time, the terminal can receive the MAC-CE considered through a combination of at least one of [Method 2-1] to [Method 2-4] and [Method 3-1] to [Method 3-4] from the base station, and can maintain the same path attenuation reference signal and power control parameters for multiple aperiodic SRS resource sets for antenna switching purposes.

[0625] The base station can transmit an SRS request field to the terminal (1415). At this time, it can determine which SRS resource set will be triggered based on the trigger state of the SRS request field.

[0626] The base station can receive an aperiodic SRS from the terminal (1420). At this time, if multiple aperiodic SRS resource sets for antenna switching purposes are triggered, the terminal can transmit SRS resources within the SRS resource sets assuming the same power control parameters.

[0627] FIG. 15 is a diagram illustrating the structure of a terminal in a wireless communication system according to an embodiment of the present disclosure.

[0628] Referring to FIG. 15, the terminal may include a transceiver, which refers to a terminal receiving unit (1500) and a terminal transmitting unit (1510), a memory (not shown), and a terminal processing unit (1505, or a terminal control unit or processor). Depending on the communication method of the terminal described above, the transceiver units (1500, 1510), the memory, and the terminal processing unit (1505) of the terminal may operate. However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more or fewer components than the components described above. In addition, the transceiver unit, the memory, and the processor may be implemented in the form of a single chip.

[0629] A transceiver unit can transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transceiver unit may include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver unit, and the components of the transceiver unit are not limited to the RF transmitter and RF receiver.

[0630] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit a signal output from the processor through the wireless channel.

[0631] Memory can store programs and data necessary for the terminal's operation. Furthermore, memory can store control information or data included in signals transmitted and received by the terminal. Memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0632] Additionally, the processor can control a series of processes to enable the terminal to operate according to the aforementioned embodiments. For example, the processor can receive DCI consisting of two layers and control components of the terminal to simultaneously receive multiple PDSCHs. There may be multiple processors, and the processors can perform terminal component control operations by executing programs stored in memory.

[0633] FIG. 16 is a diagram illustrating the structure of a base station in a wireless communication system according to an embodiment of the present disclosure.

[0634] Referring to FIG. 16, the base station may include a transceiver, which refers to a base station receiver (1600) and a base station transmitter (1610), a memory (not shown), and a base station processor (1605, or a base station control unit or processor). Depending on the communication method of the base station described above, the transceiver (1600, 1610), the memory, and the base station processor (1605) of the base station may operate. However, the components of the base station are not limited to the examples described above. For example, the base station may include more or fewer components than the components described above. In addition, the transceiver, the memory, and the processor may be implemented in the form of a single chip.

[0635] The transceiver can transmit and receive signals with the terminal. Here, the signals may include control information and data. To this end, the transceiver may be configured with an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies and down-converts the frequency of a received signal. However, this is only one embodiment of the transceiver, and the components of the transceiver are not limited to the RF transmitter and RF receiver.

[0636] Additionally, the transceiver can receive a signal through a wireless channel and output it to the processor, and transmit the signal output from the processor through the wireless channel.

[0637] The memory can store programs and data necessary for the operation of the base station. Furthermore, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be comprised of a storage medium, such as ROM, RAM, a hard disk, CD-ROM, or DVD, or a combination of such storage media. Furthermore, there can be multiple memories.

[0638] The processor can control a series of processes to enable the base station to operate according to the embodiments of the present disclosure described above. For example, the processor can configure two layers of DCIs containing allocation information for multiple 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 programs stored in memory.

[0639] 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.

[0640] 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.

[0641] 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.

[0642] 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.

[0643] In the specific embodiments of the present disclosure described above, components included in the disclosure 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.

[0644] 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.

[0645] Meanwhile, the order of description in the drawings explaining the method of the present disclosure does not necessarily correspond to the order of execution, and the order of precedence may be changed or executed in parallel.

[0646] Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components without detracting from the essence of the present disclosure.

[0647] In addition, the method of the present disclosure 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 disclosure.

[0648] 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 in a wireless communication system, A step of transmitting UE capability information including information that the terminal supports antenna switching to a base station; A step of receiving, from the base station, an SRS configuration including settings related to a plurality of aperiodic SRS (sound reference signal) resource sets for antenna switching; A step of receiving, from the base station, a MAC (medium access control) CE (control element) including a pathloss reference reference signal or a TCI (transmission configuration indication) state change instruction for one of a plurality of aperiodic SRS resource sets for antenna switching; A step of applying the change instruction equally to all of the plurality of aperiodic SRS resource sets for the above antenna switching; and A method comprising the step of transmitting an SRS based on the changed path attenuation reference reference signal or the TCI state.

2. In paragraph 1, The step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method comprising the step of applying a changed path loss reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

3. In paragraph 2, The step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method comprising: if the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, a step of applying a path attenuation reference signal or a TCI state change instruction for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for antenna switching.

4. In paragraph 3, The step of applying the change instruction to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method comprising the step of applying a path attenuation reference reference signal or TCI state change instruction for the remaining SRS resource IDs, excluding the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID, only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

5. In a method performed by a base station in a wireless communication system, A step of receiving UE capability information including information that antenna switching is supported from a terminal; A step of transmitting, to the terminal, an SRS configuration including settings related to a plurality of aperiodic SRS (sound reference signal) resource sets for antenna switching; A step of transmitting, to the terminal, a MAC (medium access control) CE (control element) including a pathloss reference reference signal or a change instruction of a transmission configuration indication (TCI) state for one of a plurality of aperiodic SRS resource sets for the antenna switching; A step of equally applying the changed path attenuation reference signal or the TCI state to all of the plurality of aperiodic SRS resource sets for the antenna switching; and A method comprising the step of receiving an SRS based on the changed path attenuation reference signal or the TCI state.

6. In paragraph 5, The step of applying the changed path attenuation reference signal or the TCI state equally to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method including a step of applying a changed path loss reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

7. In paragraph 5, The step of applying the changed path attenuation reference signal or the TCI state equally to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method comprising the step of applying, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, an instruction for changing a path attenuation reference signal or a TCI state for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for antenna switching.

8. In paragraph 7, The step of applying the changed path attenuation reference signal or the TCI state equally to all of the plurality of aperiodic SRS resource sets for the above antenna switching is: A method comprising the step of applying a path attenuation reference reference signal or TCI state change instruction for the remaining SRS resource IDs, excluding the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID, only to the SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the SRS resource set ID.

9. In the terminal of a wireless communication system, Transceiver; and Including a controller coupled with the above transceiver, The above control unit, Transmits UE capability information including information that the terminal supports antenna switching to the base station, Receives, from the base station, an SRS configuration including settings related to a plurality of aperiodic SRS (sound reference signal) resource sets for antenna switching, Receive, from the base station, a MAC (medium access control) CE (control element) including a pathloss reference reference signal or a TCI (transmission configuration indication) state change instruction for one of a plurality of aperiodic SRS resource sets for antenna switching, The above change instruction is applied equally to all aperiodic SRS resource sets for the above antenna switching. A terminal that controls to transmit SRS based on the changed path attenuation reference signal or the TCI state.

10. In paragraph 9, The above control unit, A terminal that controls to apply the changed path loss reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

11. In paragraph 9, The above control unit, A terminal that controls, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, to apply the path attenuation reference signal or TCI state change instruction for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for antenna switching in the same manner.

12. In paragraph 11, The above control unit, A terminal that controls a change instruction of a path attenuation reference signal or a TCI state for the remaining SRS resource IDs, excluding the lowest SRS resource ID in the SRS resource set corresponding to the above SRS resource set ID, to be applied only to SRS resources corresponding to the remaining SRS resource IDs in the SRS resource set corresponding to the above SRS resource set ID.

13. In a base station of a wireless communication system, Transceiver; and Including a controller coupled with the above transceiver, The above control unit, Receive UE capability information including information that supports antenna switching from a terminal, Transmitting to the terminal an SRS configuration including settings related to multiple aperiodic SRS (sound reference signal) resource sets for antenna switching, Transmitting a MAC (medium access control) CE (control element) including a pathloss reference reference signal or a change instruction of a transmission configuration indication (TCI) state for one of a plurality of aperiodic SRS resource sets for the above antenna switching to the terminal, The changed path attenuation reference signal or the TCI state is applied equally to all of the multiple aperiodic SRS resource sets for the above antenna switching, A base station that controls to receive SRS based on the changed path attenuation reference signal or the TCI state.

14. In paragraph 13, The above control unit, A base station that controls to apply the changed path loss reference signal or TCI state to the remaining plurality of aperiodic SRS resource sets for antenna switching when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for antenna switching.

15. In paragraph 13, The above control unit, A base station that controls, when the SRS resource set corresponding to the SRS resource set ID indicated by the MAC CE is one of the plurality of aperiodic SRS resource sets for the antenna switching, to apply the path attenuation reference signal or TCI state change instruction for the lowest SRS resource ID in the SRS resource set corresponding to the SRS resource set ID to the SRS resources corresponding to the lowest SRS resource ID in the remaining plurality of aperiodic SRS resource sets for antenna switching in the same manner.

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