Method and device for transmitting or receiving uplink reference signal

Abstract

The present disclosure relates to a method for transmitting or receiving an uplink reference signal in a wireless communication system, and a device therefor, the method comprising the steps of: receiving, from a base station, information related to a sounding reference signal (SRS) resource set, the information related to the SRS resource set including resource allocation mode information indicating one of a first mode, a second mode, and a third mode and information related to a plurality of SRS resources; and, when a use of the SRS resource set is set as antenna switching, transmitting an SRS in the plurality of SRS resources on the basis of the mode indicated by the resource allocation mode information.

Description

Method and device for transmitting or receiving an uplink reference signal

[0001] The present disclosure relates to a wireless communication system, and more specifically, to a method for transmitting or receiving an uplink reference signal and an apparatus for 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 frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz (THX) band (e.g., the 3 terahertz band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

[0003] In the early stages of 5G mobile communication technology, aiming to satisfy service support and performance requirements for enhanced Mobile BroadBand (eMBB), Ultra-Reliable Low-Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), technologies such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as the operation of multiple subcarrier spacings) and dynamic operation of slot formats for the efficient utilization of ultra-high frequency resources, initial access techniques to support multi-beam transmission and broadband, definition and operation of Band-Width Parts (BWP), Low Density Parity Check (LDPC) codes for high-volume data transmission, new channel coding methods such as Polar Codes for the reliable transmission of control information, and L2 pre-processing (L2 Standardization has been carried out for pre-processing, network slicing which provides a dedicated network specialized for specific services, and other methods.

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

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

[0006] When such 5G mobile communication systems are commercialized, connected devices, which are increasing explosively, will be connected to communication networks. Accordingly, it is expected that there will be a need to enhance the functionality and performance of 5G mobile communication systems and to integrate the operation of connected devices. To this end, new research is planned to be conducted on 5G performance improvement and complexity reduction, support for AI services, support for metaverse services, and drone communication using eXtended Reality (XR), Artificial Intelligence (AI), and Machine Learning (ML) to efficiently support Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR).

[0007] Furthermore, the advancement of these 5G mobile communication systems encompasses multi-antenna transmission technologies such as new waveforms to guarantee coverage in the terahertz band of 6G mobile communication technology, Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas; metamaterial-based lenses and antennas to improve terahertz band signal coverage; high-dimensional spatial multiplexing technology using OAM (Orbital Angular Momentum); and Reconfigurable Intelligent Surface (RIS) technology; as well as Full Duplex technology for enhancing frequency efficiency and system networks in 6G mobile communication technology; AI-based communication technologies that realize system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions; and the realization of services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources. It could serve as a foundation for the development of next-generation distributed computing technologies.

[0008] The technical problem of the present disclosure is to provide a method and an apparatus that can effectively solve the problem of power imbalance between antenna ports that may occur when transmitting an uplink reference signal using antenna switching.

[0009] The technical problem of the present disclosure is to provide a method and an apparatus that can effectively solve the problem of increased power consumption of a terminal due to power imbalance when transmitting an uplink reference signal using antenna switching, or the problem of overall MIMO communication performance degrading due to uneven uplink channel state estimation performance for each antenna port.

[0010] The technical problems to be solved in the various embodiments of the present disclosure are not limited to those mentioned above, and other unmentioned technical problems may be considered by those skilled in the art from the various embodiments of the present disclosure described below.

[0011] As an embodiment of the present disclosure, a method performed by a terminal in a wireless communication system is provided, the method may include the step of receiving information regarding a sounding reference signal (SRS) resource set from a base station, wherein the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources; and, when the use of the SRS resource set is set to antenna switching, the method may include the step of transmitting an SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information.

[0012] In one embodiment of the present disclosure, a terminal for a wireless communication system is provided, the terminal comprises at least one transceiver; and at least one processor connected to the at least one transceiver, wherein the at least one processor receives information regarding a sounding reference signal (SRS) resource set from a base station, and the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources, and when the use of the SRS resource set is set to antenna switching, the processor may be configured to transmit SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information.

[0013] In one embodiment of the present disclosure, a method performed by a base station in a wireless communication system is provided, the method comprising: transmitting information regarding a sounding reference signal (SRS) resource set to a terminal; wherein the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources; and, when the use of the SRS resource set is set to antenna switching, receiving an SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information.

[0014] In one embodiment of the present disclosure, a base station for a wireless communication system is provided, the base station comprises at least one transceiver; and at least one processor connected to the at least one transceiver, wherein the at least one processor transmits information regarding a sounding reference signal (SRS) resource set to a terminal, the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources, and when the use of the SRS resource set is set to antenna switching, the processor may be configured to receive SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information.

[0015] In one embodiment of the present disclosure, when the terminal is set to xTyR and the resource allocation mode information indicates the first mode, the plurality of SRS resources includes y SRS resources, and SRS can be transmitted through x antenna ports from each of the y SRS resources.

[0016] In one embodiment of the present disclosure, when the terminal is set to xTyR and the resource allocation mode information indicates the second mode, the plurality of SRS resources Includes several SRS resources and the above SRS is transmitted through x antenna ports from each of the x SRS resources, and can represent a ceiling operation.

[0017] In one embodiment of the present disclosure, when the terminal is set to xTyR and the resource allocation mode information indicates the third mode, the plurality of SRS resources It includes several SRS resources, and the above Information regarding the first SRS resource among the SRS resources includes active antenna port information or inactive antenna port information, and the above Among the SRS resources, an SRS is transmitted through x antenna ports in an SRS resource excluding the first SRS resource, and an SRS can be transmitted through antenna ports in the first SRS resource excluding the antenna port indicated by the active antenna port information or the antenna port indicated by the inactive antenna port information.

[0018] In one embodiment of the present disclosure, information regarding the SRS resource set further includes index information indicating an association between the SRS port and the antenna port for the SRS resource set among at least one association between the SRS port and the antenna port, and the antenna port used for the SRS resource set may be determined based on the index information.

[0019] In one embodiment of the present disclosure, the information regarding the set of SRS resources further includes information regarding weights for adjusting the transmission power of the SRS, and the method may further include the step of adjusting the transmission power of the SRS based on the information regarding the weights.

[0020] In one embodiment of the present disclosure, the method may further include the step of identifying the number of transmissions of an SRS per antenna port for the set of SRS resources; and the step of adjusting the transmission power of the SRS based on the identified number of transmissions of an SRS per antenna port.

[0021] In one embodiment of the present disclosure, the step of adjusting the transmission power of the SRS may include adjusting the transmission power of the SRS based on 1 / n when the number of transmissions of the SRS per identified antenna port is n.

[0022] In one embodiment of the present disclosure, the step of adjusting the transmission power of the SRS may include adjusting the transmission power of the SRS based on N / n when the number of transmissions of the SRS per identified antenna port is n and the least common multiple of the number of transmissions of the SRS per identified antenna port is N.

[0023] In one embodiment of the present disclosure, the information regarding the SRS resource set further includes information regarding the weighting per antenna port and information indicating the antenna port to which the information regarding the weighting per antenna port is applied, and the method may further include the step of adjusting the SRS transmission power for the indicated antenna port based on the information regarding the weighting per antenna port.

[0024] In one embodiment of the present disclosure, when the terminal is configured as xTyR, the information regarding the SRS resource included in the information regarding the set of SRS resources includes a p0 value per antenna port, and the method may include the step of determining the transmission power for the SRS resource based on the p0 value per antenna port.

[0025] In one embodiment of the present disclosure, information regarding the set of SRS resources includes a p0 value and an additional p0 value, and the method may include the step of determining a transmission power for a specific SRS resource among the plurality of SRS resources based on the additional p0 value, and determining a transmission power for the remaining SRS resources excluding the specific SRS resource among the plurality of SRS resources based on the p0 value.

[0026] According to the present disclosure, the problem of power imbalance between antenna ports that may occur when transmitting an uplink reference signal using antenna switching can be effectively resolved.

[0027] According to the present disclosure, when transmitting an uplink reference signal using antenna switching, the problem of increased power consumption of the terminal due to power imbalance or the problem of overall MIMO communication performance degrading due to uneven uplink channel state estimation performance for each antenna port can be effectively solved.

[0028] The effects obtainable in the present disclosure are not limited to those mentioned in the various embodiments, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0029] Figure 1 illustrates the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0030] FIG. 2 illustrates a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0031] FIG. 3 illustrates a bandwidth portion setting in a wireless communication system according to one embodiment of the present disclosure.

[0032] FIG. 4 illustrates the SRS transmission power of a terminal operating as 2T4R according to one embodiment of the present disclosure.

[0033] FIG. 5 illustrates 3T4R antenna switching according to one embodiment of the present disclosure.

[0034] FIG. 6a illustrates a terminal operating with xTyR antenna switching according to method 1 of the present disclosure transmitting an SRS in a first mode.

[0035] FIG. 6b illustrates a terminal operating with xTyR antenna switching according to method 1 of the present disclosure transmitting an SRS in a second mode.

[0036] FIG. 6c illustrates a terminal operating with xTyR antenna switching according to method 1 of the present disclosure transmitting an SRS in a third mode.

[0037] FIG. 7 illustrates an example of a first mode according to method 1 of the present disclosure when the terminal is set to xTyR antenna switching.

[0038] FIG. 8 illustrates an example of a second mode according to method 1 of the present disclosure when the terminal is set to xTyR antenna switching.

[0039] FIG. 9 illustrates an example of a third mode according to Method 1 of the present disclosure when the terminal is set to xTyR antenna switching.

[0040] FIG. 10 illustrates an embodiment for controlling SRS transmission power according to method 2-1 of the present disclosure when the terminal is set to xTyR antenna switching.

[0041] FIG. 11 illustrates an embodiment for controlling SRS transmission power according to methods 2-2 and 2-3 of the present disclosure when the terminal is set to xTyR antenna switching.

[0042] FIG. 12 illustrates an embodiment for controlling SRS transmission power according to method 2-4 of the present disclosure when the terminal is set to xTyR antenna switching.

[0043] FIG. 13 illustrates an embodiment for controlling SRS transmission power according to method 2-5 of the present disclosure when the terminal is set to xTyR antenna switching.

[0044] FIG. 14 illustrates a flowchart of a method performed by a terminal according to the present disclosure.

[0045] FIG. 15 illustrates a flowchart of a method performed by a base station according to the present disclosure.

[0046] FIG. 16 illustrates the structure of a terminal according to one embodiment of the present disclosure.

[0047] FIG. 17 illustrates the structure of a base station according to one embodiment of the present disclosure.

[0048] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0049] In describing the embodiments, technical details that are well known in the technical field to which this disclosure belongs and are not directly related to this disclosure are omitted. This is intended to convey the essence of this disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0050] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0051] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the 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. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related functions or configurations might unnecessarily obscure the essence of the present disclosure, such detailed description is omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0052] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0053] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0054] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or may be configured to run one or more processors. Accordingly, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, 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." In addition, the components and '~parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiment, the '~part' may include one or more processors.

[0055] In the present disclosure, modifiers such as "first," "second," etc., referring to terms may be used to distinguish each term from one another when describing embodiments. The terms modified by the modifiers such as "first," "second," etc., may refer to different objects. However, the terms modified by the modifiers such as "first," "second," etc., may refer to the same object. That is, the modifiers such as "first," "second," etc., may be used to refer to the same object from different perspectives. For example, the modifiers such as "first," "second," etc., may be used to distinguish the same object in terms of function or operation.

[0056] In the present disclosure, the base station is an entity that performs resource allocation for terminals and may be at least one of a gNode B, eNode B, Node B, BS (Base Station), wireless access unit, base station controller, or a node on a network. The terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In the present disclosure, the downlink (DL) refers to the wireless transmission path of a signal transmitted by the base station to the terminal, and the uplink (UL) refers to the wireless transmission path of a signal transmitted by the terminal to the base station. Furthermore, while a 5th generation wireless communication technology (5G, new radio, NR) system may be described below as an example, the present disclosure may also be applied to other communication systems having a similar technical background or channel type. For example, 6th generation wireless communication technology (6G) developed after the 5G system may be included, and the 5G of the present disclosure may be a concept that includes not only existing LTE and LTE-A but also other communication systems such as 6G. Furthermore, the present disclosure may be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure, at the discretion of a person with skilled technical knowledge.

[0057] In the present disclosure, a / b may mean at least one of a or b.

[0058] A. NR Time-Frequency Resources

[0059] The frame structure of the 5G system will be explained in more detail below with reference to the drawings.

[0060] Figure 1 illustrates the basic structure of the time-frequency domain, which is a wireless resource domain where data or control channels are transmitted in a 5G system.

[0061] The horizontal axis of FIG. 1 represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE) (101), which can be defined as one OFDM symbol (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain (e.g., 12) consecutive REs can form a single resource block (RB) (104). In the time axis, a single subframe (110) may contain multiple OFDM symbols (102). For example, the length of one subframe may be 1 ms.

[0062] FIG. 2 illustrates a frame, subframe, and slot structure in a wireless communication system according to one embodiment of the present disclosure.

[0063] Referring to FIG. 2, an example of a frame (200), subframe (201), and slot (202, 203) structure is illustrated. One frame (200) can be defined as 10 ms. One subframe (201) can be defined as 1 ms, and thus 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). One subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per one subframe (201) may vary depending on the setting value μ (204, 205) for the subcarrier spacing. In one example of FIG. 2, cases where μ=0 (204) and μ=1 (205) are shown as the setting value for the subcarrier spacing. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (203). That is, the number of slots per one subframe ( ) may vary, and accordingly, the number of slots per frame ( ) may vary. Depending on each subcarrier spacing setting μ and It can be defined by [Table 1] below.

[0064] [Table 1]

[0065]

[0066] B. Bandwidth Part (BWP)

[0067] FIG. 3 illustrates a bandwidth portion setting in a wireless communication system according to one embodiment of the present disclosure.

[0068] FIG. 3 shows an example in which the terminal bandwidth (UE bandwidth) (300) is configured into two bandwidth portions, namely Bandwidth portion #1 (BWP#1) (301) and Bandwidth portion #2 (BWP#2) (302). A base station may configure one or more bandwidth portions for a terminal. Bandwidth portions may be transmitted by the base station to the terminal via upper layer signaling, for example, Radio Resource Control (RRC) signaling. At least one of the configured bandwidth portions may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via downlink control information (DCI).

[0069] According to some embodiments, prior to the RRC connection, the terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via a Master Information Block (MIB). More specifically, during the initial connection phase, the terminal may receive configuration information for a Control Resource Set (CORESET) and a Search Space via the MIB, through which a PDCCH can be transmitted to receive system information required for initial connection (which may correspond to Remaining System Information (RMSI) or System Information Block 1 (SIB1)). The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0. The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and numerology, for Control Resource Set #0. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and monitoring occasion for Control Resource Set #0, i.e., configuration information for Search Space #0. The terminal may consider the frequency region set as control region #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0070] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0071] According to some embodiments, if the bandwidth supported by the terminal is smaller than the system bandwidth, this can be supported through the bandwidth portion setting. For example, by setting the frequency position of the bandwidth portion (setting information 2) to the terminal, the terminal can transmit and receive data at a specific frequency position within the system bandwidth.

[0072] In addition, according to some embodiments, a base station may set multiple bandwidth portions for a terminal for the purpose of supporting different numerologies. For example, to support data transmission and reception using both a 15 kHz subcarrier interval and a 30 kHz subcarrier interval for a terminal, two bandwidth portions may be set to subcarrier intervals of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed (FDM), and when data transmission and reception is to be performed with a specific subcarrier interval, the bandwidth portion set to that subcarrier interval may be activated.

[0073] In addition, according to some embodiments, a base station may set bandwidth portions with different bandwidth sizes for the purpose of reducing the power consumption of the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. In particular, in a situation where there is no traffic, monitoring an unnecessary downlink control channel using a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. To reduce the power consumption of the terminal, the base station may set a bandwidth portion with a relatively small bandwidth, such as 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.

[0074] In the method for configuring the above bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part (Initial BWP) through the MIB during the initial connection phase. More specifically, the terminal can receive a configuration of a control area (i.e., CORESET) for a downlink control channel through which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control area configured by the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. In addition to the purpose of receiving the SIB, the Initial Bandwidth Part may also be utilized for other system information (OSI), paging, and random access.

[0075] When one or more bandwidth parts are set for a terminal, the base station may instruct the terminal to change (or switch, transition) the bandwidth part using the Bandwidth Part Indicator field within the DCI. For example, in FIG. 3, if the currently active bandwidth part of the terminal is Bandwidth Part #1 (301), the base station may instruct the terminal to Bandwidth Part #2 (302) using the Bandwidth Part Indicator within the DCI, and the terminal may perform a bandwidth part change to Bandwidth Part #2 (302) indicated by the received Bandwidth Part Indicator within the DCI.

[0076] C. QCL (Quasi Co-Location), TCI (Transmission Configuration Indicator) status

[0077] In a wireless communication system, one or more different antenna ports (or may be replaced by one or more channels, signals, and combinations thereof, but for convenience in the following description of the disclosure, they will be referred to collectively as different antenna ports) may be associated with each other by a QCL setting as shown in [Table 2]. A TCI state is intended to indicate the QCL relationship between a physical downlink control channel (PDCCH) (or demodulation reference signal) and another reference signal (RS) or channel. When a reference antenna port A (reference RS #A) and another target antenna port B (target RS #B) are said to be QCLed with each other, it means that the terminal is permitted to apply some or all of the large-scale channel parameters estimated from antenna port A to channel measurements from antenna port B. QCL may require associating different parameters depending on the situation, such as 1) time tracking affected by average delay and delay spread, 2) frequency tracking affected by Doppler shift and Doppler spread, 3) radio resource management (RRM) affected by average gain, and 4) beam management (BM) affected by spatial parameters. Accordingly, 5G NR supports four types of QCL relationships as shown in [Table 2].

[0078] [Table 2]

[0079]

[0080] In the example of Table 2, the spatial RX parameter may collectively refer to some or all of the various parameters, such as AoA (angle of arrival), PAS (power angular spectrum) of AoA (PAS of AoA), AoD (angle of departure), PAS of AoD (PAS of AoD), transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0081] D. SRS (Sounding Reference Signal) Related

[0082] SRS can be used for various purposes, such as uplink channel estimation and positioning. A base station may configure at least one SRS configuration per uplink BWP to transmit configuration information for SRS transmission to a terminal, and may configure at least one SRS resource set per SRS configuration. For example, the base station and the terminal may exchange upper-layer signaling information as follows to transmit information regarding an SRS resource set (e.g., SRS-ResourceSet).

[0083] - srs-ResourceSetId: SRS resource set index or identifier

[0084] - srs-ResourceIdList: A list of SRS resource indices or identifiers referenced by an SRS resource set.

[0085] - resourceType: As a time-axis transmission setting for the SRS resource referenced in the SRS resource set, it can be set to, for example, 'periodic', 'semi-persistent', or 'aperiodic'. If set to 'periodic' or 'semi-persistent', associated CSI-RS information may be provided depending on the usage of the SRS resource set. If set to 'aperiodic', a periodic SRS resource trigger list and slot offset information may be provided, and associated CSI-RS information may be provided depending on the usage of the SRS resource set.

[0086] - usage: A setting for the usage of an SRS resource set (or an SRS resource referenced by the SRS resource set), which can be set to one of 'beamManagement', 'codebook', 'non-codebook', or 'antennaSwitching'.

[0087] - alpha, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter settings for controlling the transmission power of the SRS resources referenced in the SRS resource set.

[0088] The terminal can understand that the SRS resources included in the list of SRS resource indices or identifiers referenced in the SRS resource set follow the information set in the SRS resource set.

[0089] Additionally, the base station and the terminal may transmit and receive upper-layer signaling information to convey individual configuration information for SRS resources. For example, the individual configuration information for an SRS resource may include time-frequency axis mapping information within the slot of the SRS resource, which may include information regarding frequency hopping within or between slots of the SRS resource. Furthermore, the individual configuration information for an SRS resource may include the time-axis transmission setting of the SRS resource, which may be set to one of 'periodic', 'semi-persistent', or 'aperiodic'. This may be restricted to having the same time-axis transmission setting as the set of SRS resources containing the SRS resource. If the time-axis transmission setting of the SRS resource is set to 'periodic' or 'semi-persistent', the SRS resource transmission period and slot offset (e.g., periodicityAndOffset) may additionally be included in the time-axis transmission setting.

[0090] A base station may enable, deactivate, or trigger SRS transmission to a terminal via upper-layer signaling, including RRC signaling or MAC (medium access control) CE (control element) signaling, or L1 signaling (e.g., DCI). For example, a base station may enable or deactivate periodic SRS transmission to a terminal via upper-layer signaling. A base station may instruct a set of SRS resources with a resource type (e.g., resourceType) set to periodic via upper-layer signaling to be activated, and the terminal may transmit the SRS resources referenced in the activated set of SRS resources. The time-frequency axis resource mapping within the slot of the transmitted SRS resources follows the resource mapping information set in the SRS resources, and the slot mapping, including the transmission period and slot offset, follows the period and offset (e.g., periodicityAndOffset) set in the SRS resources. Additionally, a spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation information (e.g., spatial relation info) set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set containing the SRS resource. The terminal may transmit the SRS resource within an uplink BWP that is active for a periodic SRS resource activated through upper-layer signaling.

[0091] For example, a base station may enable or disable semi-persistent SRS transmission to a terminal via upper-layer signaling. The base station may instruct the terminal to enable an SRS resource set via MAC CE signaling, and the terminal may transmit an SRS resource referenced from the enabled SRS resource set. The SRS resource set enabled via MAC CE signaling may be limited to an SRS resource set where the resource type (e.g., resourceType) is set to semi-persistent. The time-frequency axis 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 period and offset (e.g., periodicityAndOffset) set in the SRS resource. Additionally, the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial relation information (e.g., spatial relation info) set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set containing the SRS resource. If spatial relationship information is configured in the SRS resource, a spatial domain transmission filter can be determined by referring to the configuration information regarding the spatial relationship information transmitted via MAC CE signaling that enables semi-persistent SRS transmission without following it. The terminal can transmit the SRS resource within the uplink BWP enabled for the semi-persistent SRS resource activated via upper-layer signaling.

[0092] For example, a base station can trigger an aperiodic SRS transmission to a terminal via the DCI. The base station can indicate one of the aperiodic SRS resource triggers via the SRS request field of the DCI. The terminal can understand that among the configuration information of the SRS resource set, an SRS resource set containing the aperiodic SRS resource trigger indicated via the DCI from the list of aperiodic SRS resource triggers has been triggered. The terminal can transmit the SRS resource referenced in the triggered SRS resource set. The time-frequency axis resource mapping within the slot of the transmitted SRS resource follows the resource mapping information set in the SRS resource. Additionally, the slot mapping of the transmitted SRS resource can be determined through the slot offset between the PDCCH containing the DCI and the SRS resource, which can refer to the value(s) included in the set of slot offsets set in the SRS resource set. Specifically, the slot offset between the PDCCH containing the DCI and the SRS resource may apply the value indicated in the time domain resource assignment field of the DCI from among the offset value(s) included in the set of slot offsets set in the SRS resource set. Additionally, the spatial domain transmission filter applied to the transmitted SRS resource may refer to spatial information set in the SRS resource, or may refer to associated CSI-RS information set in the SRS resource set containing the SRS resource. The terminal may transmit the SRS resource within the uplink BWP enabled for the non-periodic SRS resource triggered via the DCI.

[0093] In the present disclosure, transmitting an SRS resource may mean transmitting an SRS from said SRS resource and may be used interchangeably with transmitting an SRS. Additionally, in the present disclosure, transmitting an SRS port may mean transmitting an SRS through said SRS port and may be used interchangeably with transmitting an SRS.

[0094] E. SRS antenna switching

[0095] The SRS transmitted from the terminal can be used by the base station to acquire channel state information (CSI) (e.g., CSI acquisition). As a specific example, in a single-cell or multi-cell (e.g., carrier aggregation (CA)) situation based on time division duplex (TDD), the base station can measure the SRS transmitted from the UE after scheduling the transmission of the SRS to the UE. In this case, the base station can assume reciprocity between the DL / UL channels and regard the uplink channel information estimated based on the SRS transmitted from the terminal as downlink channel information, and use this to perform downlink signal / channel scheduling for the terminal. At this time, the terminal can receive a setting from the base station for the use of the SRS for acquiring downlink channel information as antenna switching.

[0096] SRS antenna switching may refer to the operation in which a terminal switches its reception (RX) antenna to a transmission (TX) antenna to transmit an SRS. By switching antennas, the base station can more comprehensively understand the uplink channel status of the terminal and improve resource management and communication performance. For example, when a PUSCH transmission is scheduled for the terminal, the terminal's reception antenna may be switched for SRS transmission, and the SRS may be transmitted through the terminal's reception antenna. In the present disclosure, when the terminal transmits an SRS using antenna switching, the antenna port may refer to the terminal's reception antenna port, and the SRS port may refer to the antenna port for SRS among the terminal's transmission antenna ports. Accordingly, when configured with SRS antenna switching, the number of antenna ports may be equal to the number of reception antenna ports, and the number of SRS ports may be equal to the number of transmission antenna ports.

[0097] As explained in "D. Regarding SRS," according to 3GPP standards (e.g., 3GPP TS 38.214, 3GPP TS 38.331), the use of SRS can be configured for base stations and / or terminals using higher layer parameters (e.g., usage of the RRC parameter SRS-ResourceSet). Here, the use of SRS can be configured for beam management, codebook transmission, non-codebook transmission, antenna switching, etc.

[0098] If the terminal receives from the base station that the usage parameter within the upper layer signaling SRS-ResourceSet is set to 'antennaSwitching', the terminal may receive at least one upper layer signaling setting from the base station according to the reported terminal capability. In this case, the terminal may report 'supportedSRS-TxPortSwitch' as ​​the terminal capability, and its value may be as follows. In the following, 'xTyR' may represent the terminal capability to support transmission (TX) through x antennas and reception (RX) through y antennas. For example, the number of transmitting antennas and receiving antennas that the terminal can operate for antenna switching are as follows.

[0099] - T1R2: Indicates that the terminal is capable of 1T2R operation.

[0100] - T2R4: Indicates that the terminal is capable of 2T4R operation.

[0101] - T1R4: Indicates that the terminal is capable of 1T4R operation.

[0102] - T1R6: Indicates that the terminal is capable of 1T6R operation.

[0103] - T1R8: Indicates that the terminal is capable of 1T8R operation.

[0104] - T2R6: Indicates that the terminal is capable of 2T6R operation.

[0105] - T2R8: Indicates that the terminal is capable of 2T8R operation.

[0106] - T4R8: Indicates that the terminal is capable of 4T8R operation.

[0107] - T1R1: Indicates that the terminal is capable of 1T1R operation.

[0108] - T2R2: Indicates that the terminal is capable of 2T2R operation.

[0109] - T4R4: Indicates that the terminal is capable of 4T4R operation.

[0110] F. SRS Transmission Power Control

[0111] This describes a method for a terminal to set and transmit the transmission power of an uplink reference signal or SRS. The uplink reference signal transmission power (P) of the terminal is described along with the SRS power control adjustment state corresponding to the i-th transmission unit and closed-loop index l. SRS,b,f,c (i,q s ,l)) can be determined as [Equation 1], which is expressed in dBm units. In [Equation 1], if the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined separately for cell c, carrier frequency f, and bandwidth part b, and can be distinguished by indices b, f, and c.

[0112] [Mathematical Formula 1]

[0113]

[0114] - P CMAX,f,c (i): The maximum transmission power available to the terminal in the i-th transmission unit, determined by the terminal's power class, parameters activated from the base station, and various parameters built into the terminal.

[0115] - P O_SRS,b,f,c (i): Can be set to p0, an upper-layer signaling for bandwidth part b, carrier frequency f, and cell c, and SRS resource set q s It can be configured through the upper layer signaling SRS-ResourceSet and SRS-ResourceSetId.

[0116] - μ: Subcarrier spacing configuration value

[0117] - M SRS,b,f,c(i): This may mean the amount of resources used in the i-th SRS transmission unit (e.g., the number of resource blocks (RB) used for SRS transmission in the frequency axis).

[0118] - α SRS,b,f,c (i): Can be set to α(alpha), an upper-layer signaling for bandwidth part b, carrier frequency f, and cell c, and SRS resource set q s It can be configured through the upper layer signaling SRS-ResourceSet and SRS-ResourceSetId.

[0119] - PL b,f,c (q d ) : Represents the path loss between the base station and the terminal, and the terminal uses the reference signal resource q signaled by the base station. d Path loss is calculated from the difference between the transmission power and the terminal reception signal level of the reference signal.

[0120] - h b,f,c (i,l): May represent the SRS power control adjustment state value for the i-th SRS transmission unit corresponding to the closed-loop index l within the band part b, carrier frequency f, and cell c.

[0121] The SRS power control adjustment state can be determined through the bandwidth part b, carrier frequency f, cell c, and the i-th transmission unit. If the terminal is configured to have the same power control adjustment state value between SRS transmission and PUSCH transmission via the upper-layer signaling srs-PowerControlAdjustmentStates, the SRS power control adjustment state can be expressed as in [Equation 2], and in [Equation 2], f b,f,c (i,l) may represent the current PUSCH power control adjustment state.

[0122] [Mathematical Formula 2]

[0123]

[0124] If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or if it is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through the upper layer signaling srs-PowerControlAdjustmentStates and the upper layer signaling tpc-Accumulation is not configured, the SRS power control adjustment state can be represented independently of the closed loop l as shown in [Equation 3] below.

[0125] [Mathematical Formula 3]

[0126]

[0127] - δ SRS,b,f,c (m): This may be a value indicated by the TPC command field included in DCI format 2_3.

[0128] - is the aforementioned TPC command value for a specific set S i δ for all transmission units corresponding within SRS,b,f,c It can mean the sum of. In this case, c(S i ) is set S i It can mean the number of all elements belonging within. S i can mean a set of DCIs containing all TPC command values ​​to perform a TPC command accumulation operation for the i-th PUSCH transmission unit. S i To determine, define a start point and an end point in the time dimension, and S all DCIs received by the terminal within the two points. i It can be included as an element of.

[0129] S i The end point for determining is K from the start symbol of the i-th SRS transmission unit. SRS(i) It can be a point earlier by the symbol.

[0130] S i The starting point for determining is K from the start symbol of the i-i0th SRS transmission unit. SRS It may be a point earlier by (i-i0)-1 symbols. In this case, i0, a positive integer, is the above S i The end point for determining (K from the start symbol of the i-th SRS transmission unit) SRS (i) K from the start symbol of the i-i0th SRS transmission unit compared to the point (i) earlier by a number of symbols. SRS It can be determined as the smallest value that satisfies the condition that the time point earlier by (i-i0) symbols becomes an earlier time point in time.

[0131] For example, S i The end point for determining can be defined as sym(i), and K from the start symbol of the i-i0th SRS transmission unit SRS If the time point (i-i0) earlier can be defined as sym(i-i0), then if sym(i) = sym(i-1) > sym(i-2) > sym(i-3) holds, then i0 can be determined as 2.

[0132] If the terminal is not configured for PUSCH transmission in bandwidth part b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission through the upper layer signaling srs-PowerControlAdjustmentStates, and the upper layer signaling tpc-Accumulation is configured (or if the TPC command accumulation operation cannot be performed and an absolute TPC command value can be applied), the SRS power control adjustment state can be represented independently of the closed loop l as shown in [Equation 4] below.

[0133] [Mathematical Formula 4]

[0134]

[0135] δ SRS,b,f,c (i) may be a value indicated by the TPC command field included in DCI format 2_3 within the bandwidth part b, carrier frequency f, and cell c as described above.

[0136] FIG. 4 illustrates the SRS transmission power of a terminal operating as 2T4R according to one embodiment of the present disclosure.

[0137] Referring to FIG. 4, information regarding an SRS resource set (e.g., SRS-ResourceSet) can be configured in a terminal via upper layer signaling (e.g., RRC signaling). In the information regarding the SRS resource set, the SRS resource set index or identifier (e.g., SRS-ResourceSetId) can be set to 0, the usage of the SRS resource set can be set to antenna switching (e.g., antennaSwitching), and two SRS resources (e.g., SRS resource 0, SRS resource 1) and a power control parameter p0 can be configured. For example, Table 3 illustrates information regarding an SRS resource set (e.g., SRS-ResourceSet).

[0138] [Table 3]

[0139]

[0140] The terminal is P of Equation 1 based on the power control parameter p0. O_SRS,b,f,c (i) can be determined, and P O_SRS,b,f,cBased on (i), the SRS transmission power P can be determined (e.g., see "F. SRS transmission power control"). Based on information regarding the SRS resource set, SRS resource 0 can be transmitted in the first symbol within the slot (e.g., the slot set to F) and SRS resource 1 can be transmitted in the second symbol. Since the use of the SRS resource set is set to antenna switching, the terminal can transmit SRS using antenna switching in the SRS resources (e.g., SRS resource 0, SRS resource 1). In the example of FIG. 4, it is assumed that the SRS ports of SRS resource 0 are each associated with antenna port 0 and antenna port 1 (or AP 0 and AP 1), and the SRS ports of SRS resource 1 are each associated with antenna port 2 and antenna port 3 (or AP 2 and AP 3). As explained in "E. SRS Antenna Switching," when antenna switching is used, the antenna port (AP) may refer to the receiving antenna port of the terminal, and the SRS port may refer to the antenna port for SRS among the terminal's transmitting antenna ports. Additionally, as explained in "D. SRS Related," transmitting SRS resources may mean transmitting SRS.

[0141] Referring to Fig. 4, for AP 0 and AP 1, an SRS can be transmitted with transmission power P from SRS resource 0, respectively, and for AP 2 and AP 3, an SRS can be transmitted with transmission power P from SRS resource 1, respectively. Thus, the transmission power for each antenna port can be balanced, and the base station can perform uplink channel estimation based on the target received power P.

[0142] G. The proposed method of the present disclosure

[0143] As explained in "E. SRS Antenna Switching," current 5G NR systems can support 1, 2, 4, or 8 transmit antenna ports on a terminal. However, there is a general limitation in terminal implementation, where only one or two transmit antennas are supported. With the recent advancement of hardware design technology increasing the feasibility of implementing terminals that support three transmit antennas, discussions and research are actively underway to support three transmit antennas in order to improve uplink MIMO (multiple input multiple output) performance. Accordingly, discussions and research are being conducted on 3-port transport technology that supports up to three transport layers for 5G systems, 5G-Advanced systems, or subsequent next-generation communication systems. For example, as research related to terminals supporting three transmit antennas, discussions and research are being conducted on 3T4R or 3T8R SRS antenna switching, which reuses 4-port or 8-port SRS resources during 3-port SRS transmission. For convenience of explanation in the present disclosure, a terminal supporting three transmitting antennas or a terminal capable of operating with three transmitting antennas may be referred to as a 3TX antenna terminal or a 3TX terminal.

[0144] FIG. 5 illustrates 3T4R antenna switching according to one embodiment of the present disclosure. FIG. 5 is for illustrative purposes only and is not intended to limit the present disclosure. In the example of FIG. 5, slot and symbol settings, antenna port settings, association between antenna port and SRS port, SRS resource set settings, etc., may be changed.

[0145] Referring to FIG. 5, it is assumed that information regarding an SRS resource set (e.g., SRS-ResourceSet) identical to the example in FIG. 4 is configured in a terminal via upper layer signaling (e.g., RRC signaling). In the information regarding the SRS resource set, the SRS resource set index or identifier (e.g., SRS-ResourceSetId) may be set to 0, the usage of the SRS resource set may be set to antenna switching (e.g., antennaSwitching), and two SRS resources (e.g., SRS resource 0, SRS resource 1) and a power control parameter p0 may be configured. For example, the information regarding the SRS resource set (e.g., SRS-ResourceSet) may have the structure exemplified in Table 3.

[0146] The terminal determines the SRS transmission power P based on the power control parameter p0 (e.g., see "F. SRS transmission power control") and, based on information regarding the SRS resource set, can transmit SRS resource 0 in the first symbol and SRS resource 1 in the second symbol within the slot (e.g., the slot set to F). Since the use of the SRS resource set is set to antenna switching, the terminal can transmit SRS using antenna switching in the SRS resources (e.g., SRS resource 0, SRS resource 1). In the example of FIG. 5, it is assumed that the SRS ports of SRS resource 0 are each associated with antenna ports 0 to 2 (or AP 0 to AP 2), and the SRS ports of SRS resource 1 are each associated with antenna ports 1 to 3 (or AP 1 to AP 3).

[0147] Referring to Fig. 5, in the case of AP 1 and AP 2, since the SRS is transmitted with transmission power P from SRS resource 0 and SRS resource 1, respectively, when the base station's target reception power is P, the SRS is transmitted with twice the power of the base station's target reception power. Therefore, when the base station's target reception power is P, there may be a technical problem in which unnecessary power consumption (e.g., additional power consumption of P) occurs for AP 1 and AP 2.

[0148] Additionally, referring to Fig. 5, in the case of AP 0, the SRS is transmitted from SRS resource 0 to transmission power P, and in the case of AP 3, the SRS is transmitted from SRS resource 1 to transmission power P. Therefore, when the target reception power of the base station is 2P, the SRS is not received with sufficient power, so there may be a technical problem in which the uplink channel state estimation performance is degraded.

[0149] According to the current 5G NR system, the same transmission power is applied to each SRS port. Therefore, if the transmission power control method of the current 5G NR system is applied to a 3Tx terminal, a power imbalance problem occurs between SRS ports. Due to this power imbalance between SRS ports, the power consumption of the terminal may increase, or technical problems may arise such as the overall MIMO communication performance degrading because the uplink channel state estimation performance is not uniform for each antenna port.

[0150] To effectively solve the technical problem described with reference to FIG. 5, the present disclosure proposes a method to improve MIMO communication performance by balancing the transmission power for each antenna port when antenna switching is applied to a 3Tx antenna terminal.

[0151] For convenience of explanation, the present disclosure focuses on SRS; however, the present disclosure is not limited to SRS and can be equally applied to uplink reference signals transmitted using antenna switching. Accordingly, in the present disclosure, SRS can be generalized to uplink reference signals.

[0152] Method 1 of the present disclosure proposes parameters and a signaling method for SRS resource configuration that enable balancing of the number of transmissions of SRS resources when the terminal is configured with xTyR antenna switching, and Method 2 of the present disclosure proposes parameters and a signaling method for SRS transmission power control that enables balancing of transmission power per antenna port when the terminal is configured with xTyR antenna switching. Method 1 and Method 2 of the present disclosure may be applied independently or may be applied in combination. The proposed method of the present disclosure is intended for, for example, the case where xTyR antenna switching is configured and y mod x ≠ 0, but the proposed method of the present disclosure may be applied identically or similarly even when y mod x = 0. In the present disclosure, mod refers to modulo operation.

[0153] G-1. Method 1 of the present disclosure

[0154] Method 1 of the present disclosure proposes parameters and a signaling method for SRS resource setting that enable balancing of the number of transmissions of SRS resources when a terminal is configured with xTyR antenna switching. The parameters for SRS resource setting according to Method 1 of the present disclosure may be referred to as resource allocation mode information, and may be referred to as "resourceAllocationMode" for clarity of explanation in the present disclosure. However, the names of the parameters for SRS resource setting according to Method 1 of the present disclosure may be changed. For example, the resource allocation mode information according to Method 1 of the present disclosure may be changed to names such as SRS resource allocation mode (information), repetition transmission mode (information), SRS repetition transmission mode (information), etc. For example, resourceAllocationMode according to Method 1 of the present disclosure may be changed to names such as repetitionMode, etc. The resource allocation mode information according to Method 1 of the present disclosure may be included in information regarding an SRS resource set (e.g., SRS-ResourceSet) and may be set by a base station to a terminal through upper layer signaling (e.g., RRC signaling).

[0155] The resource allocation mode according to Method 1 of the present disclosure may include at least one of a first mode, a second mode, and a third mode, and the resource allocation mode information may indicate one of the first mode, the second mode, and the third mode. When xTyR antenna switching is configured, the first mode may refer to a mode in which y SRS resources (e.g., SRS resource 0 to SRS resource y-1) are allocated within an SRS resource set so that an SRS resource can be transmitted x times per antenna port, and SRS ports are transmitted y times (repeatedly) x times from the y SRS resources. For clarity of description in the present disclosure, the first mode may be referred to as "maximum-resources," but the first mode may be changed to another name such as "fullRepetition." As described in "D. SRS Related," in the present disclosure, transmitting an SRS resource may mean transmitting an SRS from the said SRS resource and may be used interchangeably with transmitting an SRS. Additionally, in the present disclosure, transmitting an SRS port may mean transmitting an SRS through said SRS port, and may be used interchangeably with transmitting an SRS.

[0156] FIG. 6a illustrates a terminal operating with xTyR antenna switching according to Method 1 of the present disclosure transmitting an SRS in a first mode. Although 3T4R and 3T8R are illustrated in FIG. 6A for ease of understanding, the present disclosure is not limited thereto and can be applied in the same or similar manner to other numbers of antenna ports.

[0157] Referring to FIG. 6a, y SRS resources (e.g., 4 SRS resources for 3T4R, 8 SRS resources for 3T8R) may be configured in the information regarding the SRS resource set (e.g., SRS-ResourceSet), and SRS may be transmitted from each SRS resource to x SRS ports (e.g., 3 SRS ports). In FIG. 6a, the shaded blocks represent the antenna ports associated with the SRS ports in each SRS resource. As exemplified in FIG. 6a, when the first mode is applied, the terminal may transmit SRS resources x times (e.g., 3 times) per antenna port.

[0158] The second mode may refer to a mode in which a minimum number of SRS resources are allocated within a set of SRS resources so that an SRS resource can be transmitted at least once per antenna port, and x SRS ports are transmitted (repeatedly) from the minimum number of SRS resources. For clarity of description in this disclosure, the second mode may be referred to as "minimum-resources," but the second mode may be changed to another name such as "weightedRepetition." For example, when xTyR antenna switching is configured, the minimum number in the second mode is It can be determined based on, and in the present disclosure represents a ceiling operation. For example, in the case of 3T4R, the minimum number is Based on, it can be determined to be 2, and in the case of 3T8R, the minimum number is Based on this, it can be determined to be 3. Alternatively, the minimum number in the second mode may be a predefined value. In the case of the second mode according to Method 1 of the present disclosure, the same number of SRS ports may be allocated in each SRS resource, and the number of SRS resources transmitted per antenna port in the minimum number of SRS resources may differ from each other. FIG. 6b illustrates a terminal operating with 3T4R antenna switching or 3T8R antenna switching transmitting SRS in the second mode according to Method 1 of the present disclosure.

[0159] FIG. 6b illustrates a terminal operating with xTyR antenna switching according to Method 1 of the present disclosure transmitting an SRS in a second mode. Although 3T4R and 3T8R are exemplified in FIG. 6b for ease of understanding, the present disclosure is not limited thereto and can be applied in the same or similar manner to other numbers of antenna ports.

[0160] Referring to FIG. 6b, information regarding an SRS resource set (e.g., SRS-ResourceSet) may be configured with a minimum number of SRS resources (e.g., 2 SRS resources for 3T4R, 3 SRS resources for 3T8R), and SRS may be transmitted from each SRS resource to x SRS ports (e.g., 3 SRS ports). In FIG. 6b, the hatched blocks and dotted blocks represent antenna ports associated with the SRS ports in each SRS resource. As exemplified in FIG. 6b, when the second mode is applied, the terminal may transmit an SRS resource at least once per antenna port. For example, in the case of 3T4R, an SRS resource may be transmitted twice for antenna ports 0 and 1, and an SRS resource may be transmitted once for antenna ports 2 and 3. For example, in the case of 3T8R, an SRS resource can be transmitted once for antenna ports 0, 1, 3, 4, 5, 6, and 7, and an SRS resource can be transmitted twice for antenna port 2.

[0161] A third mode may refer to a mode in which a minimum number of SRS resources are allocated within a set of SRS resources so that an SRS resource can be transmitted once per antenna port, and an SRS port is transmitted once from the minimum number of SRS resources. For clarity of description in this disclosure, the third mode may be referred to as "flexible," but the third mode may be changed to other names such as "reducedSRSport." For example, the minimum number in the third mode may be determined in the same manner as in the second mode (e.g., (Determined or predefined value based on).

[0162] In the case of the third mode according to Method 1 of the present disclosure, in order to ensure that an SRS resource is transmitted once per antenna port, information indicating an antenna port to which an SRS resource is transmitted or information indicating an antenna port to which an SRS resource is not transmitted may be additionally included in the information regarding the SRS resource (e.g., SRS-Resource). For example, information indicating an antenna port to which an SRS resource is transmitted may include an index of the antenna port to which the SRS resource is transmitted among x antenna ports associated with the SRS port in the SRS resource. For clarity of description in the present disclosure, information indicating an antenna port to which an SRS resource is transmitted may be referred to as active antenna port information or "active-UE-Port-index," but the name may be changed. For example, information indicating an antenna port to which an SRS resource is not transmitted may include an index of the antenna port to which an SRS resource is not transmitted among x antenna ports associated with the SRS port in the SRS resource. For clarity of explanation in the present disclosure, information indicating an antenna port where an SRS resource is not transmitted may be referred to as inactive antenna port information or "inactive-UE-Port-index," but the name may be changed. Only one of the active antenna port information and inactive antenna port information may be set in the information regarding the SRS resource, but both of the information may be set in the information regarding the SRS resource.

[0163] FIG. 6c illustrates a terminal operating with xTyR antenna switching according to Method 1 of the present disclosure transmitting an SRS in a third mode. Although 3T4R and 3T8R are illustrated in FIG. 6c for ease of understanding, the present disclosure is not limited thereto and can be applied in the same or similar manner to other numbers of antenna ports.

[0164] Referring to FIG. 6c, information regarding an SRS resource set (e.g., SRS-ResourceSet) may be configured with a minimum number of SRS resources (e.g., 2 SRS resources for 3T4R, 3 SRS resources for 3T8R), and SRS may be transmitted once per antenna port from the minimum number of SRS resources. In FIG. 6c, the shaded blocks represent the antenna ports associated with the SRS ports in each SRS resource. As exemplified in FIG. 6c, when the third mode is applied, the terminal may transmit the SRS resources once per antenna port. In the example of FIG. 6a, information regarding an SRS resource associated with a specific SRS resource (e.g., the last SRS resource) (e.g., SRS-Resource) may include at least one of active antenna port information or inactive antenna port information. For example, the terminal can transmit SRS through the antenna port indicated by the active antenna port information in a specific SRS resource (e.g., the last SRS resource) (e.g., antenna port 3 for 3T4R, antenna ports 6 and 7 for 3T8R). For example, the terminal can transmit SRS through the remaining antenna ports excluding the antenna port indicated by the inactive antenna port information in a specific SRS resource (e.g., antenna port 3 for 3T4R, antenna ports 6 and 7 for 3T8R).

[0165] In the examples of FIGS. 6a through 6c, the association between the SRS port and the antenna port is depicted as being predefined between the base station and the terminal, but the association between the SRS port and the antenna port may be set by the base station to the terminal. In Method 1 of the present disclosure, information regarding an SRS resource set (e.g., SRS-ResourceSet) may include information indicating the association between the SRS port and the antenna port. For clarity of description in the present disclosure, information indicating the association between the SRS port and the antenna port may be referred to as "mapping index information" or "mappingIndex," but the name may be changed. The mapping index information may indicate the association between the SRS port and the antenna port to be used in the corresponding SRS resource set among at least one association between the SRS port and the antenna port. For example, at least one association between the SRS port and the antenna port may have a table form or a list form, may be pre-set between the base station and the terminal, or may be set by the base station to the terminal through system information (e.g., SIBx (system information block x)) or RRC signaling. The terminal identifies the association between the SRS port and the antenna port to be used in the SRS resource set based on mapping index information, and can transmit the SRS based on the identified association between the SRS port and the antenna port.

[0166] Tables 4 and 5 illustrate information regarding an SRS resource set (e.g., SRS-ResourceSet) and information regarding an SRS resource (e.g., SRS-Resource) according to Method 1 of the present disclosure in the ASN.1 format. Referring to Table 4, information regarding an SRS resource set (e.g., SRS-ResourceSet) may include resource allocation mode information (e.g., resourceAllocationMode) and mapping index information (e.g., mappingIndex) for the SRS resource set, and information regarding an SRS resource (e.g., SRS-Resource) may include active antenna port information (e.g., active-UE-Port-index) and / or inactive antenna port information (e.g., inactive-UE-Port-index) for the SRS resource. For example, active antenna port information (e.g., active-UE-Port-index) and / or inactive antenna port information (e.g., inactive-UE-Port-index) may be included in the information regarding the SRS resource set when the resource allocation mode information (e.g., resourceAllocationMode) is set to a third mode (e.g., flexible).

[0167] [Table 4]

[0168]

[0169] Referring to Table 5, information regarding an SRS resource (e.g., SRS-Resource) may include only one of active antenna port information and inactive antenna port information.

[0170] [Table 5]

[0171]

[0172] In the examples of Tables 4 and 5, nrofSRS-ports represents the number of SRS ports, and for example, in the case of a 3TX antenna terminal, nrofSRS-ports may be 3. maxNumberRowTable represents the maximum number of associations between an SRS port and an antenna port included in at least one association (e.g., in table form or list form) between an SRS port and an antenna port. SEQUENCE, ENUMERATED, CHOICE, INTEGER, etc. have the same meaning as defined in ASN.1, and a detailed description is omitted in this disclosure.

[0173] FIG. 7 illustrates an example of a first mode according to Method 1 of the present disclosure when the terminal is configured to xTyR antenna switching. The example in FIG. 7 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 7. For example, to aid understanding in the example in FIG. 7, it is assumed that the terminal operates in 3T4R antenna switching, that the SRS resource set index or identifier in the information regarding the SRS resource set (e.g., SRS-ResourceSet) has a value of 0, that the usage is configured to antenna switching, that y (e.g., 4) SRS resources (e.g., SRS resource 0 to SRS resource 3) are configured, that the resource allocation mode is configured to the first mode (e.g., maximum-resources), and that the mapping index information (e.g., mappingIndex) has a value of 0; however, the present disclosure may be applied identically or similarly even if the number of antenna ports and the configuration of the SRS resource set are different.

[0174] Referring to FIG. 7, nrofSRS-ports included in the information regarding the SRS resource (e.g., SRS-Resource) indicates the number of SRS ports, which may be 3 for example, in the case of a 3TX antenna terminal. startPosition included in the information regarding the SRS resource indicates the symbol position of the SRS resource within the slot, where 0 indicates the last symbol, 1 indicates the second-to-last symbol, ..., n indicates the (n+1)-th symbol from the last. periododicity and slot offset included in the information regarding the SRS resource indicate the periododicity and slot offset of the SRS resource on a slot-by-slot basis and may be determined according to the SRS resource transmission periododicity and slot offset (e.g., periodicityAndOffset) (see e.g., "D. SRS Related"). For example, the slot in which the SRS resource is transmitted is determined based on the periododicity and slot offset, and the symbol in which the SRS resource is transmitted within the slot may be determined based on startPosition.

[0175] In the example of Fig. 7, for SRS resource 0, since the value of nrofSRS-ports is 3, SRS resource 0 is transmitted to 3 SRS ports, since the value of startPosition is 3, it is transmitted at the 4th symbol from the end within the slot, and since the period is 10 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 10-slot period. For SRS resource 1, since the value of nrofSRS-ports is 3, SRS resource 1 is transmitted to 3 SRS ports, since the value of startPosition is 1, it is transmitted at the 2nd symbol from the end within the slot, and since the period is 10 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 10-slot period. In the case of SRS resource 2, since the value of nrofSRS-ports is 3, SRS resource 2 is transmitted through 3 SRS ports, since the value of startPosition is 3, it is transmitted at the 4th symbol from the end within the slot, and since the period is 10 and the slot offset is 8, it can be transmitted in slot 8 (e.g., slot F) of the frame with a 10-slot period. In the case of SRS resource 3, since the value of nrofSRS-ports is 3, SRS resource 3 is transmitted through 3 SRS ports, since the value of startPosition is 1, it is transmitted at the 2nd symbol from the end within the slot, and since the period is 10 and the slot offset is 8, it can be transmitted in slot 8 (e.g., slot F) of the frame with a 10-slot period.

[0176] In the example of Fig. 7, since the mapping index information (e.g., mappingIndex) has a value of 0, the association between the SRS port and the antenna port corresponding to index 0 among the associations between the SRS port and the antenna port (e.g., table or list) can be used. In the example of FIG. 7, three SRS ports in the first SRS resource (e.g., SRS resource 0) are each associated with antenna ports 0, 1, and 2, and the first SRS resource can be transmitted to antenna ports 0, 1, and 2; three SRS ports in the second SRS resource (e.g., SRS resource 1) are each associated with antenna ports 1, 2, and 3, and the second SRS resource can be transmitted to antenna ports 1, 2, and 3; three SRS ports in the third SRS resource (e.g., SRS resource 2) are each associated with antenna ports 2, 3, and 0, and the third SRS resource can be transmitted to antenna ports 2, 3, and 0; and three SRS ports in the fourth SRS resource (e.g., SRS resource 3) are each associated with antenna ports 3, 0, and 1, and the fourth SRS resource can be transmitted to antenna ports 3, 0, and 1.

[0177] FIG. 8 illustrates an example of a second mode according to Method 1 of the present disclosure when the terminal is configured to xTyR antenna switching. The example in FIG. 8 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 8. For example, in the example in FIG. 8, for the sake of understanding, the terminal operates in 3T4R antenna switching, the SRS resource set index or identifier in the information regarding the SRS resource set (e.g., SRS-ResourceSet) has a value of 0, and the usage is configured to antenna switching. It is assumed that two (e.g., two) SRS resources (e.g., SRS resource 0 and SRS resource 1) are set, the resource allocation mode is set to a second mode (e.g., minimum-resources), and the mapping index information (e.g., mappingIndex) has a value of 0, but the present disclosure can be applied in the same or similar way even if the number of antenna ports and the settings of the SRS resource sets are different.

[0178] Referring to FIG. 8, nrofSRS-ports, startPosition, periodicity, and slot offset included in the information regarding the SRS resource (e.g., SRS-Resource) may have the same meaning as in the example of FIG. 7.

[0179] In the example of Fig. 8, for SRS resource 0, since the value of nrofSRS-ports is 3, SRS resource 0 is transmitted to 3 SRS ports, since the value of startPosition is 3, it is transmitted at the 4th symbol from the end within the slot, and since the period is 5 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 5-slot period. For SRS resource 1, since the value of nrofSRS-ports is 3, SRS resource 1 is transmitted to 3 SRS ports, since the value of startPosition is 1, it is transmitted at the 2nd symbol from the end within the slot, and since the period is 5 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 5-slot period.

[0180] In the example of FIG. 8, since the mapping index information (e.g., mappingIndex) has a value of 0, the association between the SRS port and the antenna port corresponding to index 0 among the associations (e.g., table or list) between the SRS port and the antenna port can be used. In the example of FIG. 8, in the first SRS resource (e.g., SRS resource 0), three SRS ports are each associated with antenna ports 0, 1, and 2, and the first SRS resource can be transmitted to antenna ports 0, 1, and 2, and in the second SRS resource (e.g., SRS resource 1), three SRS ports are each associated with antenna ports 1, 2, and 3, and the second SRS resource can be transmitted to antenna ports 1, 2, and 3.

[0181] FIG. 9 illustrates an example of a third mode according to Method 1 of the present disclosure when the terminal is configured to xTyR antenna switching. The example in FIG. 9 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 9. For example, in the example in FIG. 9, for the sake of understanding, the terminal operates in 3T4R antenna switching, the SRS resource set index or identifier in the information regarding the SRS resource set (e.g., SRS-ResourceSet) has a value of 0, and the usage is configured to antenna switching. It is assumed that two (e.g., two) SRS resources (e.g., SRS resource 0 and SRS resource 1) are set, the resource allocation mode is set to a third mode (e.g., flexible), and the mapping index information (e.g., mappingIndex) has a value of 0, but the present disclosure can be applied in the same or similar way even if the number of antenna ports and the settings of the SRS resource sets are different.

[0182] Referring to FIG. 9, nrofSRS-ports, startPosition, periodicity, and slot offset included in the information regarding the SRS resource (e.g., SRS-Resource) may have the same meaning as in the example of FIG. 7. Active antenna port information (e.g., active-UE-Port-index) indicates the antenna port to which the SRS resource is transmitted, and inactive antenna port information (e.g., inactive-UE-Port-index) indicates the antenna port to which the SRS resource is not transmitted.

[0183] In the example of Fig. 9, for SRS resource 0, since the value of nrofSRS-ports is 3, SRS resource 0 is transmitted to 3 SRS ports, since the value of startPosition is 3, it is transmitted at the 4th symbol from the end within the slot, and since the period is 5 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 5-slot period. For SRS resource 1, since the value of nrofSRS-ports is 1, SRS resource 1 is transmitted to 1 SRS port, since the value of startPosition is 1, it is transmitted at the 2nd symbol from the end within the slot, and since the period is 5 and the slot offset is 3, it can be transmitted in slot 3 (e.g., slot F) of the frame with a 5-slot period.

[0184] Additionally, in the example of FIG. 9, since the active antenna port information (e.g., active-UE-Port-index) for SRS resource 1 indicates antenna port 3, among the antenna ports for SRS resource 1 indicated by the mapping index information (e.g., antenna ports 1, 2, 3), SRS resource 1 may be transmitted through antenna port 3 and not transmitted through antenna ports 1 and 2. And / or, in the example of FIG. 9, since the inactive antenna port information (e.g., inactive-UE-Port-index) for SRS resource 1 indicates antenna ports 1 and 2, among the antenna ports for SRS resource 1 indicated by the mapping index information (e.g., antenna ports 1, 2, 3), SRS resource 1 may not be transmitted through antenna ports 1 and 2 and may be transmitted through antenna port 3.

[0185] In the example of FIG. 9, since the mapping index information (e.g., mappingIndex) has a value of 0, the association between the SRS port and the antenna port corresponding to index 0 among the associations (e.g., table or list) between the SRS port and the antenna port can be used. In the example of FIG. 9, in the first SRS resource (e.g., SRS resource 0), three SRS ports are associated with antenna ports 0, 1, and 2, respectively, and the first SRS resource can be transmitted to antenna ports 0, 1, and 2. In the example of FIG. 9, in the second SRS resource (e.g., SRS resource 1), three SRS ports are associated with antenna ports 1, 2, and 3, respectively, but the second SRS resource can be transmitted to one SRS port, namely antenna port 3, and not transmitted through antenna ports 1 and 2.

[0186] G-2. Method 2 of the present disclosure

[0187] Method 2 of the present disclosure proposes parameters and a signaling method for SRS transmission power control that enable balancing of transmission power per antenna port when the terminal is configured for xTyR antenna switching. Specifically, the SRS transmission power determined at the terminal (e.g., P in Equation 1) SRS,b,f,c (i,q s We propose Method 2-1 for adjusting ,l)), Method 2-2 for adjusting transmission power per antenna port, Method 2-3 for adjusting transmission power based on the number of transmissions per antenna port, Method 2-4 for independently setting the p0 value per antenna port, Method 2-5 for separately setting p0 for a specific SRS resource, and Method 2-6 for adjusting maximum transmission power. Methods 2-1 through 2-6 are described independently, but two or more of Methods 2-1 through 2-6 may be implemented in combination (or independently).

[0188] <Method 2-1>

[0189] As described with reference to FIGS. 6a, 6b, 7, and 8, in the case of the first and second modes of the present disclosure, the terminal determines the SRS transmission power (e.g., see Equation 1 and related description), and can transmit the SRS two or more times per antenna port based on the determined SRS transmission power. In this case, if the SRS transmission power is determined to be P, the SRS reception power of the base station may be 2P or higher. If the target reception power of the base station is less than 2P, interference may occur in other cells or downlink receiving terminals within the same cell due to the SRS transmission power being higher than the target reception power, and power waste may occur on the side of the transmitting terminal as power higher than the base station's target reception power is consumed.

[0190] In Method 2-1 of the present disclosure, the base station transmits SRS power (e.g., P of Equation 1). SRS,b,f,c (i,q sInformation regarding weights for adjusting ,l)) can be signaled to the terminal. In the present disclosure, information regarding weights for adjusting SRS transmission power may be referred to as adjustment weight information or "adjustmentWeight," but the name may be changed. The adjustment weight information according to Method 2-1 of the present disclosure may be included in information regarding an SRS resource set (e.g., SRS-ResourceSet) and may be set by the base station to the terminal through upper layer signaling (e.g., RRC signaling). Table 6 exemplifies information regarding an SRS resource set containing adjustment weight information (e.g., adjustmentWeight) according to Method 2-1 of the present disclosure in the form of an ASN.1.

[0191] [Table 6]

[0192]

[0193] When adjustment weight information according to Method 2-1 of the present disclosure is signaled, the terminal may determine the SRS transmission power according to, for example, Equation 1 and the adjustment weight information (e.g., adjustmentWeight or w0). For example, the terminal may determine the SRS transmission power according to Equation 5, wherein P in Equation 5 SRS,b,f,c (i,q s ,l) can be determined according to mathematical formula 1, and w0 can be indicated by adjustment weight information.

[0194] [Mathematical Formula 5]

[0195]

[0196] FIG. 10 illustrates an embodiment for controlling SRS transmission power according to Method 2-1 of the present disclosure when the terminal is configured for xTyR antenna switching. The example in FIG. 10 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 10. For example, in the example in FIG. 10, for the sake of understanding, adjustment weight information (e.g., adjustmentWeight) is added to the information regarding the SRS resource set of FIG. 7 and the adjustment weight information is assumed to have a value of 0.9, but the present disclosure can be applied in the same or similar manner even if the number of antenna ports and the settings of the SRS resource set are different.

[0197] Referring to FIG. 10, assuming that the transmission power of the SRS transmitted from the SRS resource to the antenna port is determined to be P, if the adjustment weight information (e.g., adjustmentWeight) according to method 2-1 of the present disclosure is not signaled to the terminal by the base station, according to the first mode of the present disclosure, the SRS can be transmitted x times (e.g., 3 times) to each antenna port, so the total transmission power of the SRS transmitted by the terminal to each antenna port or the total reception power of the SRS received by the base station to each antenna port may be 3P.

[0198] On the other hand, when adjustment weight information (e.g., adjustmentWeight) according to Method 2-1 of the present disclosure is signaled to a terminal by a base station, the transmission power of the SRS transmitted from the SRS resource to the antenna port can be determined as w0*P (e.g., 0.9P). In this case, the total transmission power of the SRS transmitted by the terminal to each antenna port or the total reception power of the SRS received by the base station to each antenna port can be adjusted to 2.7P. Accordingly, according to Method 2-1 of the present disclosure, by adjusting the total SRS transmission power using the adjustment weight information, it is possible to effectively control interference with the terminal of another cell or the downlink signal of the same cell, and technical effects such as reducing the transmission power consumption of the terminal can be expected.

[0199] <Method 2-2>

[0200] As described with reference to FIG. 6b and FIG. 8, in the case of the second mode of the present disclosure, the number of SRS transmissions may vary by antenna port. In this case, the total SRS transmission power may vary by antenna port, and an imbalance in the total SRS transmission power may occur by antenna port, and the uplink channel estimation performance for some antenna ports at the base station may deteriorate.

[0201] In Method 2-2 of the present disclosure, to balance the total transmission power between antenna ports, the base station transmits SRS transmission power (e.g., P of Equation 1) per antenna port. SRS,b,f,c (i,q sInformation regarding weights for adjusting ,l)) and information indicating the antenna port to which the weights are to be applied can be signaled to the terminal. In the present disclosure, information regarding weights for adjusting SRS transmission power per antenna port may be referred to as inter-port weight information or "interPortWeight," and information indicating the antenna port to which the weights are to be applied may be referred to as weighted-port index information or "weighted-port-index," but the names may be changed. The inter-port weight information and weighted-port index information according to Method 2-2 of the present disclosure may be included in information regarding an SRS resource set (e.g., SRS-ResourceSet) and may be set by the base station to the terminal through upper-layer signaling (e.g., RRC signaling). Table 7 exemplifies information regarding an SRS resource set including inter-port weight information (e.g., interPortWeight) and weighted-port index information (e.g., weighted-port-index) according to Method 2-2 of the present disclosure in the form of ASN.1. In the example of Table 7, the information regarding the SRS resource set is illustrated as including the inter-port weight information and the weighted port index information once, but multiple pairs of inter-port weight information and the weighted port index information may be included in the information regarding the SRS resource set.

[0202] [Table 7]

[0203]

[0204] When inter-port weighting information and weighted port index information according to Method 2-2 of the present disclosure are signaled to a terminal by a base station, the terminal can adjust the transmission power for the antenna port indicated by the weighted port index information by applying the inter-port weighting information to the antenna port indicated by the weighted port index information. As an example not limiting the present disclosure, if 3T4R antenna switching is set, the weighted port index information has a value of 2, and the inter-port weighting information has a value of β, the transmission power for antenna port 2 is βP SRS,b,f,c (i,q s It can be determined as ,l), and the transmission power for the remaining antenna ports 0, 1, and 3 is P SRS,b,f,c (i,q s It can be determined as ,l).

[0205] As previously explained, Method 2-1 and Method 2-2 of the present disclosure may be implemented in combination. In this case, adjustment weight information (e.g., adjustmentWeight or w0) according to Method 2-1 of the present disclosure may be additionally included in the information regarding the SRS resource set. As an example that does not limit the present disclosure, if 3T4R antenna switching is configured, weighted port index information has a value of 2, inter-port weight information has a value of β, and adjustment weight information has a value of w0, the transmission power for antenna port 2 is βw0P SRS,b,f,c (i,q s It can be determined as ,l), and the transmission power for the remaining antenna ports 0, 1, and 3 is w0P SRS,b,f,c (i,q s It can be determined as ,l).

[0206] <Method 2-3>

[0207] As a method for adjusting SRS transmission power per antenna port, in Method 2-3 of the present disclosure, the terminal can adjust the transmission power per antenna port based on the number of transmissions per antenna port. For example, the number of SRS transmissions per antenna port can be identified based on the association between the SRS port and the antenna port, and the association between the SRS port and the antenna port may be predefined between the terminal and the base station or may be indicated to the terminal by the base station by mapping index information (e.g., see Method 1 of the present disclosure). As a more specific example, referring to FIG. 8, the number of transmissions for antenna ports 0, 1, 2, and 3 can be identified as 1, 2, 2, and 1, respectively.

[0208] In method 2-3 of the present disclosure, the terminal may adjust the SRS transmission power per antenna port inversely proportional to, for example, the number of SRS transmissions per identified antenna port or based on the reciprocal of the number of SRS transmissions per antenna port. For example, assuming that 3T4R antenna switching is set and the number of SRS transmissions per antenna port is identified as n0, n1, n2, n3 and the SRS transmission power is determined as P, the transmission power per antenna port may be adjusted to P / n0, P / n1, P / n2, P / n3. For example, assuming that 3T4R antenna switching is set and the number of SRS transmissions per antenna port is identified as n0, n1, n2, n3, the least common multiple of the number of SRS transmissions per antenna port is N and the SRS transmission power is determined as P, the transmission power per antenna port can be adjusted based on the value obtained by dividing the least common multiple of the number of SRS transmissions per antenna port by SRS (e.g., N / n0, N / n1, N / n2, N / n3) or the ratio of the value obtained by dividing the least common multiple of the number of SRS transmissions per antenna port by the number of SRS transmissions per antenna port to the total sum of the number of SRS transmissions per antenna port (e.g., N / Sn0, N / Sn1, N / Sn2, N / Sn3, S=n0+n1+n2+n3). As an example that does not limit the present disclosure, assuming that 3T4R antenna switching is set and the number of SRS transmissions per antenna port is identified as 1, 2, 2, 1 and the SRS transmission power is determined as P, since the least common multiple of the number of SRS transmissions per antenna port is 2, the transmission power per antenna port can be adjusted to 2P, P, P, 2P or 2P / 6, P / 6, P / 6, 2P / 6.

[0209] Method 2-3 of the present disclosure may be implemented in combination with Method 2-1 and / or Method 2-2 of the present disclosure or may be implemented independently. For example, even when inter-port weighting information and weighted port index information according to Method 2-2 of the present disclosure are signaled from a base station, the terminal may adjust the transmission power per antenna port based on Method 2-3 of the present disclosure. For example, when inter-port weighting information and weighted port index information according to Method 2-2 of the present disclosure are not signaled from a base station, the terminal may adjust the transmission power per antenna port based on Method 2-3 of the present disclosure. For example, when adjustment weighting information according to Method 2-1 of the present disclosure is signaled from a base station, the adjustment weighting information may be additionally applied to the transmission power per antenna port.

[0210] FIG. 11 illustrates an embodiment for controlling SRS transmission power according to Method 2-2 and Method 2-3 of the present disclosure when the terminal is configured for xTyR antenna switching. The example in FIG. 11 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 11. For example, to aid understanding in the example in FIG. 11, it is assumed that adjustment weight information (e.g., adjustmentWeight), inter-port weight information (e.g., interPortWeight), and weighted-port index information (e.g., weighted-port-index) are added to the information regarding the SRS resource set of FIG. 8 and are set to values ​​of 0.9, 1, 2, and 0.55, respectively; however, the present disclosure can be applied identically or similarly even if the number of antenna ports and the configuration of the SRS resource set are different.

[0211] Referring to FIG. 11, if the adjustment weight information (e.g., adjustmentWeight) according to Method 2-1 of the present disclosure, the inter-port weight information (e.g., interPortWeight) and weighted-port index information (e.g., weighted-port-index) according to Method 2-2 of the present disclosure are not set in the information regarding the SRS resource set, the transmission power per antenna port can be adjusted based on the number of transmissions per antenna port according to Method 2-3 of the present disclosure. In the example of FIG. 11, assuming that the SRS transmission power is determined as P (according to Equation 1), the SRS resource is transmitted once to antenna ports 0 and 3 and the SRS resource is transmitted twice to antenna ports 1 and 2, and the transmission power for antenna ports 0 and 3 can be adjusted to 2 times. Alternatively, in the example of FIG. 11, the transmission power for antenna ports 1 and 2 can be adjusted to 1 / 2. Therefore, when Method 2-3 of the present disclosure is applied, a balance of transmission power per antenna port can be achieved even when the number of transmissions per antenna port varies.

[0212] Referring to FIG. 11, when adjustment weight information (e.g., adjustmentWeight) according to Method 2-1 of the present disclosure, inter-port weight information (e.g., interPortWeight) and weighted-port index information (e.g., weighted-port-index) according to Method 2-2 of the present disclosure are set in information regarding an SRS resource set, the terminal can adjust the transmission power per antenna port based on the adjustment weight information, inter-port weight information, and weighted-port index information. In the example of FIG. 11, assuming that the SRS transmission power is determined to be P (according to Equation 1), the adjustment weight information is set to 0.9, so the transmission power can be adjusted to 0.9P. Additionally, since the weighted-port index information indicates antenna ports 1 and 2 and the inter-port weight information is set to 0.55, the transmission power for antenna ports 1 and 2 can be adjusted to 0.55*0.9P. As exemplified in FIG. 11, the transmission power for antenna ports 0 to 3 can be adjusted to 0.9P, 0.99P, 0.9P, and 0.99P, respectively. Therefore, compared to the example in FIG. 5, the transmission power per antenna port can be effectively controlled to achieve a balance of transmission power per antenna port, and the weighting of the transmission power per antenna port can be adjusted according to the channel environment to transmit the SRS at an optimal transmission power.

[0213] <Method 2-4>

[0214] Method 2-4 of the present disclosure proposes a method for assigning p0 to each antenna port. As explained with reference to Equation 1, p0 is P O_SRS,b,f,c(i) represents information used to configure or identify, and can be used by the terminal to determine SRS transmission power. The base station may assign a set of p0 values ​​corresponding to the number of SRS ports (e.g., nrofSRS-ports) to information regarding the SRS resource (e.g., SRS-Resource). For example, if configured with 3T4R antenna switching, the set of p0 values ​​may be configured to include p0 values ​​per SRS port (e.g., 3 p0 values). The terminal may determine the transmission power for the corresponding SRS resource per SRS port based on the set of p0 values ​​included in the information regarding the SRS resource. For example, the terminal P based on the p0 per SRS port O_SRS,b,f,c (i) can be identified and the transmission power for the corresponding SRS resource can be determined for each SRS port using Equation 1. Table 8 illustrates information regarding an SRS resource (e.g., SRS-Resource) according to Method 2-4 of the present disclosure in the form of ASN.1. In the example of FIG. 8, p0,1 represents the p0 value for SRS port 0, p0,2 represents the p0 value for SRS port 1, and p0,x represents the p0 value for SRS port x-1.

[0215] [Table 8]

[0216]

[0217] FIG. 12 illustrates an embodiment for controlling SRS transmission power according to Method 2-4 of the present disclosure when the terminal is configured for xTyR antenna switching. The example in FIG. 12 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 12. For example, in the example in FIG. 12, it is assumed that a set of p0 is configured in the information regarding the SRS resources of FIG. 9 for the sake of understanding, but the present disclosure can be applied in the same or similar manner even if the number of antenna ports and the configuration of the SRS resources are different.

[0218] Referring to FIG. 12, for SRS resource 0, the p0 set may be set to {p0,1 p0,2 p0,3}, and for SRS resource 1, the p0 set may be set to {p0,1}. The p0,1 for SRS resource 0 and the p0,1 for SRS resource 1 may be set identically or differently. p0,1 represents p0 for SRS port 0, p0,2 represents p0 for SRS port 1, and p0,3 represents p0 for SRS port 2. In the example of FIG. 11, since SRS resource 1 is transmitted to one antenna port (e.g., antenna port 3), the p0 set may include one p0,1.

[0219] In the example of FIG. 12, three SRS ports in SRS resource 0 are associated with antenna ports 0 to 2, and the transmission power for SRS port 0 or antenna port 0 in SRS resource 0 can be determined as P1 based on p0,1 of SRS resource 0, the transmission power for SRS port 1 or antenna port 1 in SRS resource 0 can be determined as P2 based on p0,2 of SRS resource 0, and the transmission power for SRS port 2 or antenna port 2 in SRS resource 0 can be determined as P3 based on p0,3 of SRS resource 0. The transmission power for SRS port 0 or antenna port 3 in SRS resource 1 can be determined as P4 based on p0,1 of SRS resource 1. Thus, according to method 2-4 of the present disclosure, the transmission power can be effectively controlled per antenna port.

[0220] <Method 2-5>

[0221] Method 2-5 of the present disclosure proposes including an additional p0 in the information regarding the set of SRS resources to separately set p0 for a specific SRS resource. In the present disclosure, the additional p0 may be referred to as p0_additional, but the name may be changed. The additional p0 may be used to determine the transmission power for the antenna port of the specific SRS resource. For example, when set to the third mode of the present disclosure (e.g., flexible), the specific SRS resource may be an SRS resource with active antenna port information and / or inactive antenna port information set, but other SRS resources are also possible. Thus, when the additional p0 is set, the transmission power for the antenna port of the specific SRS resource can be controlled independently. Table 9 illustrates information regarding the set of SRS resources (e.g., SRS-ResourceSet) including the additional p0 according to Method 2-4 of the present disclosure.

[0222] [Table 9]

[0223]

[0224] FIG. 13 illustrates an embodiment for controlling SRS transmission power according to Method 2-5 of the present disclosure when the terminal is configured for xTyR antenna switching. The example in FIG. 13 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 13. For example, in the example in FIG. 13, it is assumed that an additional p0 is configured in the information regarding the SRS resource set of FIG. 9 for the sake of understanding, but the present disclosure may be applied in the same or similar manner even if the number of antenna ports and the configuration of the SRS resources are different.

[0225] Referring to FIG. 13, p0 may be applied to SRS resource 0 and an additional p0 (e.g., p0_additional) may be applied to SRS resource 1, but the opposite is also possible. In the example of FIG. 13, the transmission power for SRS resource 0 may be determined as P1 according to Equation 1 based on p0, and the transmission power for SRS resource 1 may be determined as P2 according to Equation 1 based on the additional p0. Thus, according to Method 2-5 of the present disclosure, transmission power can be controlled by setting p0 for each SRS resource.

[0226] <Method 2-6>

[0227] Referring to Equation 1, for carrier frequency f and cell c, the maximum transmission power P CMAX,f,c (i) can be set. As explained with reference to Equation 1, P CMAX,f,c (i) is the maximum transmission power available to the terminal in the i-th transmission unit, which can be determined by the terminal's power class, parameters activated from the base station, and various parameters built into the terminal. The terminal calculates the SRS transmission power P, and the calculated SRS transmission power P is the maximum transmission power P CMAX,f,c (i) If less than or equal to, the calculated SRS transmission power P is SRS transmission power P SRS,b,f,c (i,q s It can be determined as ,l)). If at least one of Method 1, Method 2-1 to Method 2-5 of the present disclosure is applied, the SRS transmission power P can be adjusted based on the applied method. For example, the SRS transmission power P can be calculated based on Equation 6.

[0228] [Mathematical Formula 6]

[0229]

[0230]

[0231] If the calculated SRS transmission power P is the maximum transmission power P CMAX,f,cIf it is greater than (i), the terminal has a maximum transmission power P CMAX,f,c (i) At least one of methods 2-1 to 2-3 of the present disclosure can be applied to adjust the transmission power per antenna port. For example, when method 2-1 of the present disclosure is applied, the terminal adjusts the maximum transmission power P based on adjustment weighting information. CMAX,f,c (i) can be adjusted. For example, when Method 2-2 of the present disclosure is applied, the terminal has a maximum transmission power P for the antenna port indicated by the weighted port index information. CMAX,f,c (i) can be adjusted based on inter-port weighting information. For example, when Method 2-3 of the present disclosure is applied, the terminal can adjust the maximum transmission power P per antenna port based on the number of transmissions per antenna port. CMAX,f,c (i) can be adjusted. For example, the weight for an antenna port may be determined by the least common multiple of the number of SRS transmissions per antenna port divided by SRS, or based on the ratio of the least common multiple of the number of SRS transmissions per antenna port divided by the number of SRS transmissions per antenna port to the total sum of the number of SRS transmissions per antenna port (e.g., see Method 2-3 of the present disclosure). For example, 3T4R antenna switching is set and the number of transmissions for antenna ports 0 to 3 are 2, 3, 3, and 2, respectively, and the calculated SRS transmission power P is the maximum transmission power P CMAX,f,c Assuming it is greater than (i), the transmission power per antenna port is 3P each CMAX,f,c (i), 2P CMAX,f,c (i), 2P CMAX,f,c (i), 3P CMAX,f,c (i) determined as or 3 / 10*P CMAX,f,c (i), 2 / 10*P CMAX,f,c (i), 2 / 10*P CMAX,f,c (i), 3 / 10*P CMAX,f,c (i) can be determined.

[0232] FIG. 14 illustrates a flowchart of a method performed by a terminal according to the present disclosure. The example in FIG. 14 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 14. Some components in FIG. 14 may be omitted, and components not shown in FIG. 14 may be added.

[0233] Referring to FIG. 14, the terminal can receive information regarding an SRS resource set from a base station (1402). The information regarding the SRS resource set may include resource allocation mode information (e.g., resourceAllocationMode) according to method 1 of the present disclosure and information regarding a plurality of SRS resources (e.g., SRS-Resource).

[0234] When the terminal is set to use the SRS resource set (e.g., usage) as antenna switching (e.g., antennaSwitching), it can transmit SRS from a plurality of SRS resources based on the mode indicated by the resource allocation mode information according to method 1 of the present disclosure (1404).

[0235] For example, when the terminal is configured as xTyR and the resource allocation mode information indicates a first mode (e.g., maximum-resources), the plurality of SRS resources includes y SRS resources, and SRS can be transmitted through x antenna ports from each of the y SRS resources. For example, when the terminal is configured as xTyR and the resource allocation mode information indicates a second mode (e.g., minimum-resources), the plurality of SRS resources Includes several SRS resources SRS can be transmitted through x antenna ports from each of the SRS resources. For example, if the terminal is configured as xTyR and the resource allocation mode information indicates a third mode (e.g., flexible), the multiple SRS resources Includes several SRS resources, Information regarding a specific SRS resource among the SRS resources may include active antenna port information (e.g., active-UE-Port-index) or inactive antenna port information (e.g., inactive-UE-Port-index). If the information regarding a specific SRS resource includes active antenna port information, Among the SRS resources, SRS is transmitted through x antenna ports from SRS resources excluding a specific SRS resource, and SRS can be transmitted through the antenna port indicated by the active antenna port information from the specific SRS resource. If the information regarding the specific SRS resource includes inactive antenna port information, Among the SRS resources, SRS is transmitted through x antenna ports from SRS resources excluding a specific SRS resource, and SRS can be transmitted through antenna ports excluding the antenna port indicated by the inactive antenna port information in the specific SRS resource.

[0236] As described in Method 1 of the present disclosure, the association between an SRS port and an antenna port may be predefined between the base station and the terminal, but the base station may also set it for the terminal. When the base station indicates the association between the SRS port and the antenna port, information regarding the SRS resource set may include mapping index information (e.g., mappingIndex), and the mapping index information may indicate the association between the SRS port and the antenna port for the SRS resource set among at least one association between the SRS port and the antenna port. The terminal may determine the antenna port used for the SRS resource set based on the mapping index information.

[0237] In the example of FIG. 14, the terminal can adjust or control the SRS transmission power using at least one of methods 2-1 to 2-6 of the present disclosure. For example, when method 2-1 of the present disclosure is used, information regarding the SRS resource set may include adjustment weight information (e.g., adjustmentWeight), and the terminal can adjust the transmission power of the SRS based on the adjustment weight information according to method 2-1 of the present disclosure. For example, when method 2-2 of the present disclosure is used, information regarding the SRS resource set may include inter-port weight information (e.g., interPortWeight) and weighted-port index information (e.g., weighted-port-index), and the terminal can adjust the SRS transmission power for the antenna port indicated by the weighted-port index information based on the inter-port weight information according to method 2-2 of the present disclosure.

[0238] For example, when Method 2-3 of the present disclosure is used, the terminal can identify the number of transmissions of SRS per antenna port for an SRS resource set according to Method 2-3 of the present disclosure and adjust the transmission power of the SRS based on the identified number of transmissions of the SRS per antenna port. As a specific example, if the identified number of transmissions of the SRS per antenna port is n, the terminal can adjust the transmission power of the SRS based on 1 / n. As a specific example, if the identified number of transmissions of the SRS per antenna port is n and the least common multiple of the identified number of transmissions of the SRS per antenna port is N, the terminal can adjust the transmission power of the SRS based on N / n.

[0239] For example, when Method 2-4 of the present disclosure is used, an antenna port-specific p0 value for each SRS resource included in the information regarding the SRS resource set may be included in the information regarding the SRS resource (e.g., SRS-Resource), and the terminal may determine the transmission power for the SRS resource based on the antenna port-specific p0 value according to Method 2-4 of the present disclosure. For example, when Method 2-5 of the present disclosure is used, the information regarding the SRS resource set may include a p0 value and an additional p0 value, and the terminal may determine the transmission power for a specific SRS resource among a plurality of SRS resources based on the additional p0 value according to Method 2-5 of the present disclosure, and determine the transmission power for the remaining SRS resources excluding the specific SRS resource among the plurality of SRS resources based on the p0 value.

[0240] Although the operation of the terminal was described in Fig. 14, it will be clearly understood that the base station performs an operation corresponding to the operation of the terminal. For example, the base station can perform the operation exemplified in Fig. 15.

[0241] FIG. 15 illustrates a flowchart of a method performed by a base station according to the present disclosure. The example in FIG. 15 is for illustrative purposes only, and the present disclosure is not limited to the example in FIG. 15. Some components in FIG. 15 may be omitted, and components not shown in FIG. 15 may be added.

[0242] Referring to FIG. 15, the base station can transmit information regarding an SRS resource set to a terminal (1502). The information regarding an SRS resource set may include resource allocation mode information (e.g., resourceAllocationMode) according to method 1 of the present disclosure and information regarding a plurality of SRS resources (e.g., SRS-Resource).

[0243] When the base station is set to use an SRS resource set (e.g., usage) as antenna switching (e.g., antennaSwitching), it can receive SRS from a plurality of SRS resources based on the mode indicated by the resource allocation mode information according to method 1 of the present disclosure (1504). An operation corresponding to the operation of the terminal described with reference to FIG. 14 can be performed by the base station, and the entire description of FIG. 14 is included herein by reference.

[0244] F. Structure of the device

[0245] FIG. 16 illustrates the structure of a terminal according to one embodiment of the present disclosure. The example of FIG. 16 is for illustrative purposes only, and the present disclosure is not limited to the example of FIG. 16. Some components in FIG. 16 may be omitted, and components not shown in FIG. 16 may be added.

[0246] Referring to FIG. 16, the terminal (1600) may include a transceiver (1620) including a receiver and a transmitter, a memory (1630), and a processor (1610). The transceiver (1620), memory (1630), and processor (1610) of the terminal may be configured to implement the proposed method of the present disclosure. The transceiver (1620), memory (1630), and processor (1630) may be implemented in the form of one or more semiconductor chips.

[0247] The transceiver (1620) may be configured to transmit and receive signals with a base station. The signals may include, for example, control information and data. The transceiver may be composed of an RF (radio frequency) transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver may receive a signal through a wireless channel and output it to a processor, and transmit the signal output from the processor through a wireless channel.

[0248] The memory (1630) can store programs and data necessary for the operation of the terminal. Additionally, the memory can store control information or data included in signals transmitted and received by the terminal. The memory can be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memories.

[0249] A processor (1610) can control a series of processes so that the terminal can operate according to the proposed method of the present disclosure. For example, the processor can control the components of the terminal to receive information regarding an SRS resource set and to perform SRS transmission and control of SRS transmission power according to the proposed method of the present disclosure. There may be multiple processors, and the processors can perform the control operation of the terminal components by executing a program stored in memory.

[0250] FIG. 17 illustrates the structure of a base station according to one embodiment of the present disclosure. The example of FIG. 17 is for illustrative purposes only, and the present disclosure is not limited to the example of FIG. 17. Some components in FIG. 17 may be omitted, and components not shown in FIG. 17 may be added.

[0251] Referring to FIG. 17, a base station (1700) may include a transceiver (1720) comprising a receiver and a transmitter, a memory (1730), and a processor (1710). The transceiver (1720), memory (1730), and processor (1710) of the terminal may be configured to implement the proposed method of the present disclosure. The transceiver (1720), memory (1730), and processor (1710) may be implemented in the form of one or more semiconductor chips.

[0252] The transceiver (1720) can transmit and receive signals with a terminal. The signals may include, for example, control information and data. The transceiver may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely one embodiment of the transceiver, and the components of the transceiver are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver may receive a signal through a wireless channel and output it to a processor, and transmit the signal output from the processor through a wireless channel.

[0253] The memory (1730) can store programs and data necessary for the operation of the base station. Additionally, the memory can store control information or data included in signals transmitted and received by the base station. The memory can be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memories.

[0254] A processor (1710) can control a series of processes to enable a base station to operate according to the proposed method of the present disclosure. For example, the processor can control each component of the base station to transmit information regarding an SRS resource set and to perform control of SRS reception and SRS transmission power according to the proposed method of the present disclosure. There may be multiple processors, and the processors can perform control operations of the components of the base station by executing a program stored in memory.

[0255] 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.

[0256] When implemented in software, a computer-readable storage medium may be provided for storing one or more programs (software modules). One or more programs stored in the computer-readable storage medium are configured for execution by one or more processors within an electronic device. 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 this disclosure.

[0257] Such programs (software modules, software) may be stored in random access memory, non-volatile memory including flash memory, ROM (Read Only Memory), Electrically Erasable Programmable Read Only Memory (EEPROM), magnetic disc storage devices, Compact Disc-ROM (CD-ROM), Digital Versatile Discs (DVDs), or other forms of optical storage devices, magnetic cassettes. Alternatively, they may be stored in memory composed of some or all of these. Additionally, each constituent memory may include multiple units.

[0258] Additionally, the program may be stored on an attachable storage device accessible via a communication network such as the Internet, Intranet, Local Area Network (LAN), Wide LAN (WLAN), or Storage Area Network (SAN), or a combination thereof. Such a storage device may be connected to the device performing the embodiment of the present disclosure through an external port. Additionally, a separate storage device on the communication network may be connected to the device performing the embodiment of the present disclosure.

[0259] In the specific embodiments of the present disclosure described above, the components included in the disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0260] Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, it is understood that various modifications are possible within the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

[0261] The various embodiments of the present disclosure and the terms used therein are not intended to limit the technology described in the present disclosure to specific embodiments and should be understood to include various modifications, equivalents, and / or substitutions of said embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar components. A singular expression may include a plural expression unless the context clearly indicates otherwise. In the present disclosure, expressions such as "A or B," "at least one of A and / or B," "A, B or C," or "at least one of A, B and / or C" may include all possible combinations of items listed together. Expressions such as "first," "second," "first," or "second" may modify said components regardless of order or importance and are used only to distinguish one component from another and do not limit said components. When it is mentioned that a certain (e.g., 1st) component is "(functionally or telecommunicationally) connected" or "connected" to another (e.g., 2nd) component, said certain component may be directly connected to said other component or connected through another component (e.g., 3rd component).

[0262] As used in this disclosure, the term "module" includes a unit composed of hardware, software, or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be a component formed integrally, or a minimum unit or part thereof that performs one or more functions. For example, a module may be composed of an application-specific integrated circuit (ASIC).

[0263] Various embodiments of the present disclosure may be implemented as software (e.g., a program) comprising instructions stored in a machine-readable storage medium (e.g., internal memory or external memory) that is readable by a machine (e.g., a computer). The machine may include a terminal according to various embodiments, which is a device capable of calling instructions stored from the storage medium and operating according to the called instructions. When the instructions are executed by a processor, the processor may perform a function corresponding to the instructions directly or by using other components under the control of the processor. The instructions may include code generated or executed by a compiler or an interpreter.

[0264] A device-readable storage medium may be provided in the form of a non-transitory storage medium. Here, 'non-transitory' means merely that the storage medium does not contain a signal and is tangible, without distinguishing whether data is stored semi-permanently or temporarily on the storage medium.

[0265] Methods according to the various embodiments disclosed herein may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a product. The computer program product may be distributed online in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)) or through an application store (e.g., Play Store™). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created in a storage medium such as the memory of a manufacturer's server, an application store's server, or a relay server. Each component (e.g., a module or program) according to the various embodiments may be composed of a singular or multiple entities, and some of the aforementioned sub-components may be omitted, or other sub-components may be further included in the various embodiments. Generally or additionally, some components (e.g., a module or program) may be integrated into a single entity to perform the same or similar functions as those performed by each of the respective components prior to integration. Operations performed by a module, program, or other component according to various embodiments may be executed sequentially, in parallel, iteratively, or heuristically, or at least some operations may be executed in a different order, omitted, or other operations may be added.

Claims

1. In a method performed by a terminal in a wireless communication system, A step of receiving information regarding a sounding reference signal (SRS) resource set from a base station, wherein the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources; and A method comprising the step of transmitting SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information when the use of the above SRS resource set is set to antenna switching.

2. In Claim 1, A method in which, when the terminal is set to xTyR and the resource allocation mode information indicates the first mode, the plurality of SRS resources includes y SRS resources, and SRS is transmitted through x antenna ports from each of the y SRS resources.

3. In Claim 2, When the above terminal is configured as xTyR and the resource allocation mode information indicates the second mode, the plurality of SRS resources are Includes several SRS resources and the above SRS is transmitted through x antenna ports from each of the x SRS resources, and is a method representing a ceiling operation.

4. In Claim 3, When the above terminal is configured as xTyR and the resource allocation mode information indicates the third mode, the plurality of SRS resources are It includes several SRS resources, and the above Information regarding the first SRS resource among the SRS resources includes active antenna port information or inactive antenna port information, and the above A method in which an SRS is transmitted through x antenna ports in an SRS resource excluding the first SRS resource among the SRS resources, and an SRS is transmitted through antenna ports in the first SRS resource excluding the antenna port indicated by the active antenna port information or the antenna port indicated by the inactive antenna port information.

5. In Claim 4, The information regarding the above SRS resource set further includes index information indicating an association between the SRS port and the antenna port for the above SRS resource set among at least one association between the SRS port and the antenna port, and A method in which the antenna port used for the above SRS resource set is determined based on the above index information.

6. In Claim 1, The information regarding the above SRS resource set further includes information regarding weights for adjusting the transmission power of the above SRS, and The above method is, A method further comprising the step of adjusting the transmission power of the SRS based on information regarding the above weights.

7. In Claim 1, A step of identifying the number of transmissions of SRS per antenna port for the above SRS resource set; and A method further comprising the step of adjusting the transmission power of the SRS based on the number of transmissions of the SRS per identified antenna port.

8. In Claim 7, The step of adjusting the transmission power of the above SRS is, A method comprising adjusting the transmission power of the SRS based on 1 / n when the number of transmissions of the SRS per identified antenna port is n.

9. In Claim 7, The step of adjusting the transmission power of the above SRS is, A method comprising adjusting the transmission power of the SRS based on N / n when the number of transmissions of the SRS for each identified antenna port is n and the least common multiple of the number of transmissions of the SRS for each identified antenna port is N.

10. In Claim 1, The information regarding the above SRS resource set further includes information regarding weights per antenna port and information indicating the antenna port to which the information regarding weights per antenna port is applied, The above method is, A method further comprising the step of adjusting the SRS transmission power for the indicated antenna port based on information regarding the weighting per antenna port.

11. In Claim 1, When the above terminal is configured as xTyR, the information regarding SRS resources included in the information regarding the SRS resource set includes p0 values ​​per antenna port, and The above method is, A method comprising the step of determining the transmission power for the SRS resource based on the p0 value for each antenna port.

12. In Claim 1, The information regarding the above SRS resource set includes a p0 value and an additional p0 value, and The above method is, A method comprising the step of determining transmission power for a specific SRS resource among the plurality of SRS resources based on the additional p0 value, and determining transmission power for the remaining SRS resources excluding the specific SRS resource among the plurality of SRS resources based on the p0 value.

13. In a terminal for a wireless communication system, The above terminal is, At least one transceiver; and It includes at least one processor connected to the above-mentioned at least one transceiver, and the at least one processor, Information regarding a sounding reference signal (SRS) resource set is received from a base station, and the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources. A terminal configured to transmit SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information when the use of the above SRS resource set is set to antenna switching.

14. In a method performed by a base station in a wireless communication system, A step of transmitting information regarding a sounding reference signal (SRS) resource set to a terminal, wherein the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources; and A method comprising the step of receiving SRS from a plurality of SRS resources based on a mode indicated by the resource allocation mode information when the use of the above SRS resource set is set to antenna switching.

15. In a base station for a wireless communication system, The above base station is, At least one transceiver; and It includes at least one processor connected to the above-mentioned at least one transceiver, and the at least one processor, Information regarding a sounding reference signal (SRS) resource set is transmitted to a terminal, and the information regarding the SRS resource set includes resource allocation mode information indicating one of a first mode, a second mode, and a third mode, and information regarding a plurality of SRS resources. A base station configured to receive SRS from the plurality of SRS resources based on the mode indicated by the resource allocation mode information when the use of the above SRS resource set is set to antenna switching.

Images