Method and apparatus for controlling uplink power for each sub-band in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data rates than a 4G communication system such as LTE. A method of a terminal according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, configuration information indicating a plurality of sub-bands for uplink; receiving at least one downlink reference signal from the base station; on the basis of the at least one downlink reference signal, determining uplink power for each of at least one sub-band indicated by downlink control information (DCI) among the plurality of sub-bands; and transmitting an uplink signal to the base station on the basis of the uplink power for each sub-band.

Description

Method and apparatus for controlling uplink power by subband in a wireless communication system

[0001] The present disclosure relates to a wireless communication system. More specifically, the present disclosure relates to a method and apparatus for controlling uplink power by subband in a wireless communication system.

[0002] Looking back at the evolution of wireless communication through successive generations, technologies have been developed primarily for human-oriented services, such as voice, multimedia, and data. Following the commercialization of 5G (5th-generation) communication systems, connected devices, which have been increasing explosively, are expected to be connected to communication networks. Examples of networked objects include vehicles, robots, drones, home appliances, displays, smart sensors installed in various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve into various form factors, such as augmented reality glasses, virtual reality headsets, and holographic devices. In the 6G (6th-generation) era, efforts are underway to develop improved 6G communication systems to connect hundreds of billions of devices and objects to provide diverse services. For this reason, 6G communication systems are being referred to as "beyond 5G" systems.

[0003] In the 6G communication system predicted to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 gigabit) bps, and the wireless latency is 100 microseconds (μsec). In other words, compared to the 5G communication system, the transmission speed in the 6G communication system is 50 times faster, and the wireless latency is reduced to one-tenth.

[0004] To achieve such high data transmission speeds and ultra-low latency, 6G communication systems are being considered for implementation in the terahertz band (e.g., the 95 GHz to 3 terahertz (3 THz) band). In the terahertz band, due to more severe path loss and atmospheric absorption compared to the millimeter wave (mmWave) band introduced in 5G, the importance of technology capable of guaranteeing signal reach, or coverage, is expected to increase. As key technologies to ensure coverage, radio frequency (RF) devices, antennas, new waveforms that offer better coverage than orthogonal frequency division multiplexing (OFDM), beamforming, and multi-antenna transmission technologies such as massive multiple-input and multiple-output (massive MIMO), full-dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas must be developed. In addition, new technologies such as metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS) are being discussed to improve coverage of terahertz band signals.

[0005] In addition, to improve frequency efficiency and system network, development is underway in 6G communication systems for full duplex technology, in which uplink and downlink simultaneously utilize the same frequency resources at the same time; network technology that integrates satellites and HAPS (high-altitude platform stations); network structure innovation technology that supports mobile base stations and enables network operation optimization and automation; dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction; AI-based communication technology that utilizes AI (artificial intelligence) from the design stage and internalizes end-to-end AI support functions to realize system optimization; and next-generation distributed computing technology that realizes services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high performance communication and computing resources (mobile edge computing (MEC), cloud, etc.). In addition, attempts are continuing to further strengthen connectivity between devices, further optimize networks, promote the softwareization of network entities, and increase the openness of wireless communication through the design of new protocols to be used in 6G communication systems, the implementation of hardware-based security environments, the development of mechanisms for the safe utilization of data, and the development of technologies regarding privacy maintenance methods.

[0006] Due to the research and development of such 6G communication systems, it is expected that a new dimension of hyper-connected experience will become possible through the hyper-connectivity of 6G communication systems, which encompasses not only connections between objects but also connections between people and objects. Specifically, it is projected that 6G communication systems will enable the provision of services such as truly immersive extended reality (truly immersive XR), high-fidelity mobile holograms, and digital replicas. Furthermore, services such as remote surgery, industrial automation, and emergency response, which are provided through 6G communication systems with enhanced security and reliability, will be applied in various fields including industry, healthcare, automotive, and home appliances.

[0007] The embodiments of the present disclosure aim to provide an apparatus and a method capable of effectively providing services in a wireless communication system.

[0008] A method of a terminal in a wireless communication system according to one embodiment of the present disclosure may be provided. The method of the terminal may include: receiving configuration information from a base station indicating a plurality of subbands for an uplink; receiving at least one downlink reference signal from the base station; determining a subband-specific uplink power for at least one subband indicated by DCI (Downlink Control Information) among the plurality of subbands based on the at least one downlink reference signal; and transmitting an uplink signal to the base station based on the subband-specific uplink power.

[0009] A terminal may be provided in a wireless communication system according to one embodiment of the present disclosure. The terminal may include a transceiver and at least one processor coupled to the transceiver. The at least one processor may receive configuration information indicating a plurality of subbands for an uplink from a base station through the transceiver, receive at least one downlink reference signal from the base station through the transceiver, determine an uplink power for at least one subband indicated by DCI (Downlink Control Information) among the plurality of subbands based on the at least one downlink reference signal, and transmit an uplink signal to the base station through the transceiver based on the uplink power for each subband.

[0010] A computer-readable recording medium disclosed as a technical means for achieving the above-described technical task may store a program for executing at least one of the embodiments of the disclosed method on a computer.

[0011] Other technical features can be easily made clear to a person skilled in the art from the following drawings, descriptions, and claims.

[0012] FIG. 1 is a drawing for explaining the technical field of the present disclosure.

[0013] FIG. 2 is a diagram illustrating a subband-based uplink power control method in one embodiment of the present disclosure.

[0014] FIG. 3 is a flowchart illustrating a subband-based uplink power control method in one embodiment of the present disclosure.

[0015] FIGS. 4a and 4b are drawings illustrating a method for performing subband-specific power control using subband-specific path attenuation values ​​based on CSI-RS in one embodiment of the present disclosure.

[0016] FIGS. 5a to 5d are drawings illustrating a method for performing subband-specific power control using a subband-specific path attenuation value based on an SSB in one embodiment of the present disclosure.

[0017] FIGS. 6a and 6b are drawings illustrating a method for performing subband-specific power control using subband-specific path attenuation values ​​based on CSI-RS and SSB in one embodiment of the present disclosure.

[0018] FIGS. 7a and 7b are drawings illustrating a method for performing subband-specific power control for PUCCH or SRS transmission using subband-specific path attenuation values ​​based on CSI-RS and SSB in one embodiment of the present disclosure.

[0019] FIGS. 8a and 8b are drawings for explaining a method of performing subband-specific power control by having a base station indicate different target PSDs for each subband in one embodiment of the present disclosure.

[0020] FIGS. 9a to 9c are drawings for explaining a sub-band power adjustment method when the total uplink power exceeds the maximum transmission power in one embodiment of the present disclosure.

[0021] FIGS. 10a to 10c are drawings for explaining a method in which a terminal transmits a PHR to a base station in one embodiment of the present disclosure.

[0022] FIGS. 11a to 11e are drawings for explaining a method in which a terminal transmits a subband-specific PHR to a base station in one embodiment of the present disclosure.

[0023] FIG. 12 is a diagram illustrating a method for a terminal to control uplink power by subband in one embodiment of the present disclosure.

[0024] FIG. 13 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0025] FIG. 14 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0026] The present disclosure is subject to various modifications and may have various embodiments; specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, FIGS. 1 through 14 discussed below and the various embodiments used to explain the principles of the present disclosure in this specification are merely illustrative and should not be construed as limiting the scope of the present disclosure in any way. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any appropriately arranged system or device. Furthermore, those skilled in the art will understand that the principles of the present disclosure may be implemented in any appropriately configured wireless communication system.

[0027] 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.

[0028] In addition, numbers used in the description process of the specification (e.g., 1st, 2nd, etc.) are merely identifiers to distinguish one component from another.

[0029] 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. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present disclosure, if it is determined that a detailed description of a related function or configuration 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 conventions of the user or operator. Therefore, their definitions should be based on the content throughout the specification.

[0030] Hereinafter, a base station (BS) is an entity that performs resource allocation for terminals and may be at least one of an NG-RAN, gNode B, eNode B, Node B, or xNode B (where x is an alphabet including g and e), a radio access unit, a base station controller, a satellite, an airborn, or a node on a network. A distributed base station may be separated into a centralized unit (CU) and a distributed unit (DU). The CU provides support for higher protocol layers such as SDAP (service data adaptation protocol), RRC (radio resource control), and PDCP (packet data convergence protocol), and the DU may provide support for lower protocol layers such as RLC (radio link control), MAC (medium access control), and PHY (physical layer). A single CU may exist for each gNodeB, and multiple DUs may be connected to each CU. The DU includes both baseband processing and RF functions and can support various mobility scenarios.

[0031] Hereinafter, the terminal (user equipment, UE) may include a Mobile Station (MS), a Vehicle, a Satellite, an Airborne, a Cellular Phone, a Smartphone, a Computer, or a Multimedia System capable of performing communication functions.

[0032] In addition, while LTE, LTE-A, or 5G systems may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5G-Advance or NR-Advance or 6th generation mobile communication technology (6G) developed after 5G mobile communication technology (or new radio, NR) may be included, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0033] 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).

[0034] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specified logical function(s). It should also be noted that in some alternative practices, 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 be executed in reverse order according to their corresponding functions.

[0035] 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 configured to run one or more processors. Thus, 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 embodiments, 'parts' may include one or more processors.

[0036] Terms used in the following description to refer to broadcast information, control information, communication coverage, state changes (e.g., events), network entities, messages, and device components are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms having equivalent technical meanings may be used.

[0037] For the convenience of the following explanation, the present invention uses terms and names defined in the LTE and NR specifications, which are the most recent standards defined by the 3GPP (The 3rd Generation Partnership Project) among currently existing communication standards. However, the present invention is not limited by the above terms and names and can be applied in the same way to systems conforming to other standards.

[0038] 5G systems must support services that simultaneously satisfy various requirements so as to freely reflect the diverse needs of users and service providers. Services considered for 5G systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), or ultra-reliable and low-latency communication (URLC).

[0039] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing these peak data rates, the 5G system must also provide an increased user-perceived data rate. To satisfy these requirements, improvements in various transmission and reception technologies, including enhanced multi-input multi-output (MIMO) transmission technology, may be required. Additionally, while LTE systems transmit signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G systems can meet the data transmission speeds required by 5G communication systems by using a frequency bandwidth wider than 20 MHz in frequency bands of 3 to 6 GHz or above 6 GHz.

[0040] Simultaneously, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G systems. To efficiently provide IoT, mMTC requires support for a large number of terminal connections within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT provides communication functions attached to various sensors and devices, it must be possible to support a large number of terminals within a cell (e.g., 1,000,000 terminals / km²). Furthermore, due to the nature of the service, terminals supporting mMTC are likely to be located in dead zones not covered by cells, such as building basements, thus requiring wider coverage compared to other services provided by 5G communication systems. Terminals supporting mMTC must consist of low-cost devices, and because it is difficult to frequently replace terminal batteries, they require a very long battery life of 10 to 16 years.

[0041] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, or emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For instance, services supporting URLLC must satisfy an air interface latency of less than 0.5 milliseconds and simultaneously meet the requirement of a packet error rate of 10⁻⁵ or less. Consequently, for services supporting URLLC, 5G systems must provide a smaller transmit time interval (TTI) than other services and simultaneously allocate wide resources in the frequency band to ensure the reliability of the communication link.

[0042] In addition, in 5G systems and / or 6G systems, data traffic for the three aforementioned services, namely eMBB, URLLC, and mMTC services, can be multiplexed and transmitted within the communication system. Different transmission and reception techniques and parameters may be used between services to satisfy the different requirements of each service.

[0043] FIG. 1 is a drawing for explaining the technical field of the present disclosure.

[0044] Referring to Fig. 1, 3GPP (3 rdAn exemplary method of uplink power control of a terminal defined in the Generation Partnership Project (NR) (new radio) and the problems of the prior art arising therefrom are illustrated.

[0045] First, 5G(5 th For the uplink transmission signals of the terminal (e.g., PUSCH (Physical Uplink Shared Channel), SRS (Sounding Reference Signal), PUCCH (Physical Uplink Control Channel)) in Generation NR, a specific power control method may be defined by the 3GPP specification. For example, the terminal can determine the transmission power of PUSCH based on Equation 1.

[0046]

[0047] - represents the index of the transmission occasion.

[0048] - If so, PUSCH corresponding to the RAR UL grant (including initial / re-transmission), If so, configured grant (CG) PUSCH, If so, it is the power parameter of the dynamic grant (DG) PUSCH.

[0049] - represents the index of the beam (or QCL (quasi-co-located)).

[0050] - represents closed-loop power control adjustment states, and or It could be.

[0051] - can be the maximum output power value set for the terminal at transmission occasion i of the carrier wave f of cell c.

[0052] - may be a path loss value measured from a downlink path loss reference signal corresponding to the uplink BWP b of the carrier f of cell c. Path loss can be calculated as referenceSignalPower-higher layer filtered RSRP (reference signal received power). Here, referenceSignalPower is a value set by the base station for the terminal and may be included in SIB1. Higher layer filtered RSRP may be a value obtained by filtering the RSRP value measured from the path loss reference signal. Here, the path loss reference signal may be an SSB or a CSI-RS.

[0053] - is a path loss compensation index, which can be a value (alpha) that the base station sets for the terminal.

[0054] ■ Regarding, can be a value set in the upper layer parameter (msg3-Alpha or msgA-Alpha). If the upper layer parameter is not set, It could be.

[0055] ■ Regarding, It can be set in the upper layer setting value (P0-PUSCH-AlphaSet) corresponding to the activated TCI state.

[0056] - can be the number of RBs scheduled for PUSCH, and can be a value corresponding to the subcarrier interval.

[0057] - can be a power value controlled according to the bits per RE (resource element) of PUSCH. If the upper layer setting value (deltaMCS) is not set, It could be.

[0058] - may be a value associated with the PUSCH's received power target. It could be. Here is a value commonly set for terminals within the cell, and may be a value set per terminal.

[0059] ■ If the terminal established an RRC connection using a Type-1 random access procedure (4-step random access procedure) and did not receive a specific RRC parameter (P0-PUSCH-AlphaSet), or if it is a PUSCH corresponding to a RAR UL grant (including initial / retransmission),

[0060] ◆ If, And, is the receive target power (preambleReceivedTargetPower) of the PRACH preamble set in the upper layer, and may be the power difference (msg3-DeltaPreamble or deltaPreamble) between the PRACH preamble and msg3 PUSCH set in the upper layer. If the power difference (msg3-DeltaPreamble or deltaPreamble) between the PRACH preamble and msg3 PUSCH set in the upper layer is not set, It could be.

[0061] ■ If the terminal has established an RRC connection using a Type-2 random access procedure (2-step random access procedure) and has not received specific RRC parameters (P0-PUSCH-AlphaSet), or if it is a PUSCH for a Type-2 random access procedure (including initial / retransmission),

[0062] ◆ If, And, is the receive target power of the PRACH preamble set in the upper layer (msgA-preambleReceivedTargetPower or preambleReceivedTargetPower), and can be the power difference (msgA-DeltaPreamble or deltaPreamble) between the PRACH preamble and msg3 PUSCH set in the upper layer. If the power difference (msgA-DeltaPreamble or deltaPreamble) between the PRACH preamble and msg3 PUSCH set in the upper layer is not set, It could be.

[0063] ■ Regarding Configured grant PUSCH, , can be set to a specific upper-level parameter (p0-NominalWithoutGrant). If p0-NominalWithoutGrant is not set, = It could be.

[0064] ■ Regarding Dynamic grant PUSCH, , can be set to a specific upper-level parameter (p0-NominalWithGrant). If p0-NominalWithGrant is not set, = It could be.

[0065] ■ Regarding, It can be set in the upper layer setting value (P0-PUSCH-AlphaSet) corresponding to the activated TCI state.

[0066] - can be a closed-loop power control value at transmission opportunity i. l is a value representing the PUSCH power control adjustment state, and l=0 or l=1. The value of can be determined based on the TPC (transmit power control) command value indicated in the DCI format that schedules PUSCH.

[0067] The PUSCH transmission power used by the terminal may change over time. For example, The value may be a value measured by the terminal from the path loss reference signal. Therefore, depending on the terminal's mobility or channel environment, The value may change. In addition, the maximum transmission power of the PUSCH that the terminal can use is This may be the case. Therefore, when a terminal reaches its maximum transmission power, even if the base station instructs the terminal to increase its transmission power further to improve the reception signal quality (e.g., by instructing via a TPC command included in the DCI format), the quality of the signal received by the base station may not improve because the terminal's transmission power does not increase. Therefore, the base station may need to receive information regarding the terminal's PUSCH transmission power value.

[0068] According to the uplink power control method described above, the terminal can calculate the total uplink power based on the number of allocated resource blocks (RB). At this time, the total uplink power calculated is the terminal's maximum transmit power ( If it does not exceed ), the total uplink power can increase linearly as the number of RBs increases.

[0069] With reference to Fig. 1, we intend to explain in more detail the problems that may arise when following the uplink power control method described above. The terminal can uniformly allocate the same power to each RB across the entire uplink bandwidth. In other words, as the total uplink power increases as the number of RBs increases, the terminal can transmit uplink signals in a manner where the power per RB remains constant. This aligns with the formula defined in 3GPP NR (the [Equation 1] described above), and has the advantage that, particularly for terminals that have relatively small uplink power and do not utilize a wide bandwidth, a similar level of UL SINR (Signal to Interference plus Noise Ratio) can be secured even if power is allocated equally per RB.

[0070] However, in the future, it is expected that there will be an increase in terminals that support higher uplink power and can utilize a wider uplink bandwidth, such as Customer Premises Equipment (CPE) used in FR2 (Frequency Range 2) FWA (Fixed Wireless Access) environments. For such terminals, the method of covering the entire uplink bandwidth with the same power per RB, as in the prior art, may cause problems where transmission performance is degraded by inducing uneven SINR in specific frequency ranges. That is, as illustrated in FIG. 1, if the same power is transmitted across the entire RB, it fails to account for the fact that the power required per RB actually varies depending on the frequency channel characteristics or interference environment; consequently, an imbalance may occur in which a section (101) where the SINR is excessively low or a section (102) where it is excessively high.

[0071] In summary, FIG. 1 illustrates that a conventional uplink power control method according to the 3GPP NR specification allocates power evenly across the entire frequency resource, while also exemplifying the problem that performance may be degraded due to a non-uniform SINR distribution in terminals performing high-power, wideband uplink transmission in the future. The present disclosure aims to enable efficient power distribution and SINR securing considering frequency resources and terminal characteristics by proposing a new uplink power control method to solve this problem.

[0072] FIG. 2 is a diagram illustrating a subband-based uplink power control method in one embodiment of the present disclosure.

[0073] Referring to FIG. 2, a method is illustrated in which the entire uplink bandwidth operated by a single base station is divided into multiple subbands (201, 202, 203, 204) and independent power control is performed for each subband, taking into account the characteristics of a 5G Advanced or 6G terminal that supports higher uplink power and a wider uplink bandwidth than a conventional mobile communication terminal.

[0074] According to existing uplink power control methods, by uniformly allocating the same power to each RB across the entire bandwidth, a relatively constant Signal to Interference plus Noise Ratio (SINR) could be achieved in cases where the bandwidth was relatively narrow or the terminal's output was low. However, in 5G Advanced or 6G environments, situations where high-output terminals utilize wider bandwidths are increasing. In such situations, the method of allocating the same power to each RB fails to adequately reflect the differences in channel characteristics and interference environments between RBs, which can lead to SINR imbalance. This not only degrades overall transmission efficiency but can also cause performance degradation issues due to excessive power usage or insufficient power allocation in specific subband segments.

[0075] Referring to FIG. 2, according to one embodiment of the present disclosure, the uplink bandwidth operated by a single base station may be divided into a plurality of subbands. For example, the uplink bandwidth may be divided into a first subband (201), a second subband (202), a third subband (203), and a fourth subband (204). In this case, each subband (201, 202, 203, 204) may be set by the base station to the terminal or defined in a 3GPP standard.

[0076] According to one embodiment of the present disclosure, a base station can control a terminal to apply different power control parameters to RBs included in each subband (201, 202, 203, 204), thereby allowing various wireless environment factors such as channel conditions or interference amounts to be reflected more precisely.

[0077] For example, if the first subband (201) is a frequency range with relatively high surrounding interference, higher power may be allocated, and if the second subband (202) has low interference and sufficiently high channel gain, it may be adjusted so as not to use unnecessarily high power. This allows for securing an equal SINR for each subband or distributing power more efficiently according to the frequency characteristics of each subband.

[0078] By using the subband-based uplink power control method illustrated in Fig. 2, the high transmission power and wide bandwidth supported by the terminal can be efficiently utilized, thereby maximizing transmission quality and efficiency. In particular, in terminal environments such as Customer Premises Equipment (CPE) that perform high-power and wideband transmission, it is expected that system performance can be improved by minimizing SINR deviations per RB through different power control for each subband section. Furthermore, even when the channel environment changes dynamically over time, the base station can respond flexibly by appropriately updating power control parameters for each subband.

[0079] FIG. 3 is a flowchart illustrating a subband-based uplink power control method in one embodiment of the present disclosure.

[0080] Referring to FIG. 3, a subband-based uplink power control method according to one embodiment of the present invention is illustrated in sequence.

[0081] In step S301, a terminal (UE) according to one embodiment of the present disclosure may transmit terminal capability information (UE Capability) to a base station (BS). At this time, the terminal may transmit terminal capability information (UE Capability), such as the maximum number of subbands capable of measuring the Reference Signal Received Power (RSRP) and / or path loss per subband, the supported bandwidth, and the transmission power range, to the base station via a Radio Resource Control (RRC) signal or separate upper layer signaling. However, step S301 may be omitted according to various embodiments of the present disclosure.

[0082] In step S302, a base station (BS) according to one embodiment of the present disclosure may instruct a terminal via RRC signaling a subband division method, the location of a reference signal to be measured (e.g., CSI-RS (Channel State Information Reference Signal) and / or SSB (Synchronization Signal Block)), and a resource allocation method. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0083] In step S303, a base station (BS) according to one embodiment of the present disclosure may transmit CSI-RS and / or SSB to a terminal. At this time, the base station may transmit CSI-RS and / or SSB to the terminal to enable the terminal to measure RSRP and / or path loss by subband. The base station may periodically transmit CSI-RS over the entire bandwidth or transmit SSB intensively to a specific subband to enable the terminal to estimate accurate channel conditions on a subband basis.

[0084] In step S304, a terminal (UE) according to one embodiment of the present disclosure may calculate RSRP and / or path loss for each subband based on CSI-RS and / or SSB received from a base station. At this time, the terminal may calculate an independent path loss value for each subband by considering the measurement method and parameters instructed by the base station, or, if necessary, infer a path loss value using RSRP. Specifically, the terminal may determine the path loss value for each subband by calculating the difference between the RSRP measured in each subband and the CSI-RS and / or SSB transmission power set by the base station. Additionally, if the base station obtains uplink measurement values ​​through the Sounding Reference Signal (SRS) received from the terminal, the base station may also estimate the path loss value for each subband and transmit it to the terminal.

[0085] In step S305, a terminal (UE) according to one embodiment of the present disclosure may determine the uplink power for each subband based on the measured RSRP and / or path loss values ​​for each subband. A terminal according to one embodiment of the present disclosure may determine the uplink power for each subband for at least one subband indicated by Downlink Control Information (DCI) from a base station among a plurality of subbands. At this time, the terminal may determine the uplink power for each subband by considering together the target received power value and / or path loss compensation coefficient for each subband, which are set by RRC signaling from the base station, and the closed-loop power control value for each subband, which is dynamically indicated by the DCI. In the process of determining the uplink power for each subband, the terminal may determine the optimal uplink power that corresponds to the target Signal to Interference plus Noise Ratio (SINR) for each subband by comprehensively reflecting the parameters for each subband. Through this, more efficient and sophisticated power control can be achieved by flexibly responding to different channel characteristics and interference conditions across frequency ranges in a wide-bandwidth transmission environment.

[0086] In step S306, a terminal (UE) according to one embodiment of the present disclosure can transmit an uplink signal to a base station (BS) according to a determined power value for each subband. By doing so, the terminal can obtain the effect of securing a uniform SINR for each subband or improving energy efficiency by applying an optimized uplink power that reflects the path loss and interference conditions of each subband. Through this, superior transmission performance can be achieved even during high-power and wideband uplink transmission compared to the existing single-path loss compensation method.

[0087] FIGS. 4a and 4b are drawings illustrating a method for performing subband-specific power control using subband-specific path attenuation values ​​based on CSI-RS in one embodiment of the present disclosure.

[0088] A base station according to one embodiment of the present disclosure may instruct a terminal, through RRC signaling, a subband division method, the location of a reference signal to be measured (e.g., CSI-RS), and a resource allocation method. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0089] Referring to FIG. 4a, the band operated by a base station according to one embodiment of the present disclosure may be divided into subband s0 (401), subband s1 (402), subband s2 (403), and subband s3 (404). A base station according to one embodiment of the present disclosure may periodically transmit CSI-RS (405) over the entire band.

[0090] According to one embodiment of the present disclosure, a terminal has a path attenuation value for each of a plurality of subbands (s0 (401), s1 (402), s2 (403), s3 (404)) based on CSI-RS (405) received from a base station. (406), (407), (408), (409)) can be measured. Through this, the terminal can obtain individual channel state information for each subband.

[0091] Referring to FIG. 4b, a terminal according to one embodiment of the present disclosure can determine uplink power per subband based on measured path attenuation values ​​per subband. According to one embodiment of the present disclosure, among a plurality of subbands (s0 (401), s1 (402), s2 (403), s3 (404)), at least one subband for uplink transmission (e.g., subband s1 (402) and subband s2 (403)) may be indicated from a base station. For example, the at least one subband may be indicated by a DCI that schedules PUSCH.

[0092] The terminal has path attenuation values ​​for subband s1 (402) and subband s2 (403) ( (407), Based on (408), the uplink power for subbands s1 (402) and s2 (403) can be determined. At this time, each subband s i The uplink power for (i is an integer greater than or equal to 0) can be calculated as shown in the following mathematical formula 2.

[0093]

[0094] Here, Each subband s i It may be a path attenuation value calculated for, is each subband s i ε₀ silver , silver It can be referred to as.

[0095] The terminal can calculate the total uplink power by summing the uplink power for each subband si. For example, the terminal can calculate the total uplink power by summing the uplink power determined for subband s1 (402) and the uplink power determined for subband s2 (403). In this case, the total uplink power can be calculated as shown in Equation 3.

[0096]

[0097] Here, can be the uplink power for each subband si, and It can be the total uplink power.

[0098] FIGS. 5a to 5d are drawings illustrating a method for performing subband-specific power control using subband-specific path attenuation values ​​based on SRS and SSB in one embodiment of the present disclosure.

[0099] A base station according to one embodiment of the present disclosure may instruct a terminal, through RRC signaling, a subband division method, the location of a reference signal (e.g., SSB) to be measured, and a resource allocation method. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0100] Referring to FIG. 5a, the band operated by a base station according to one embodiment of the present disclosure may be divided into subbands s0 (501), s1 (502), s2 (503), and s3 (504). A base station according to one embodiment of the present disclosure may transmit an SSB (505) at a specific period in a specific bandwidth. For example, a base station may transmit an SSB (505) at a period of 20 ms in subband s1 (502). According to one embodiment of the present disclosure, a terminal obtains a path attenuation value (for subband s1 (502)) based on the SSB (505) received from the base station. (506)) can be measured.

[0101] At this time, for subbands where SSB (505) is not transmitted (e.g., s0 (501), s2 (503), s3 (504)), the terminal cannot directly measure the path attenuation value, so a method to compensate for this will be explained below.

[0102] Referring to FIG. 5b, a terminal according to one embodiment of the present disclosure may transmit a Sounding Reference Signal (SRS) (506) to a base station over all subbands (s0 (501), s1 (502), s2 (503), s3 (504)). For example, the terminal may transmit the SRS to the base station over all subbands at a period of 20 ms. Based on the SRS (506) received from the terminal, the base station [determines] an uplink path attenuation value ( (507), '(508), (509), (510)) can be measured.

[0103] Referring to FIG. 5c, a base station according to one embodiment of the present disclosure has an uplink path attenuation value (in a subband where an SSB (505) is not transmitted (e.g., s0 (501), s2 (503), s3 (504)) (507), (509), (510)) information about the difference value ( - , - , - It can be transmitted to the terminal in the form of ).

[0104] Referring to FIG. 5d, a terminal according to one embodiment of the present disclosure can determine uplink power for each subband. According to one embodiment of the present disclosure, among a plurality of subbands (s0 (501), s1 (502), s2 (503), s3 (504)), at least one subband for uplink transmission (e.g., subband s0 (501) and subband s1 (502)) may be indicated from a base station. For example, the at least one subband may be indicated by a DCI that schedules PUSCH.

[0105] According to one embodiment of the present disclosure, the terminal receives a difference value ( Path attenuation value for subband s0 (501) based on ) (511)) can be estimated. The terminal can estimate the path attenuation value ( for subband s0 (501) and subband s1 (502) (511), Based on (506), the uplink power for subbands s0 (501) and s1 (502) can be determined. At this time, each subband s i The uplink power for (i is an integer greater than or equal to 0) can be calculated as shown in Equation 2 above.

[0106] The terminal can calculate the total uplink power by summing the uplink power for each subband si. For example, the terminal can calculate the total uplink power by summing the uplink power determined for subband s0 (501) and the uplink power determined for subband s1 (502). At this time, the total uplink power can be calculated as in Equation 3 described above.

[0107] FIGS. 6a and 6b are drawings illustrating a method for performing subband-specific power control using subband-specific path attenuation values ​​based on CSI-RS and SSB in one embodiment of the present disclosure.

[0108] A base station according to one embodiment of the present disclosure may instruct a terminal, through RRC signaling, a subband division method, the location of a reference signal to be measured (e.g., CSI-RS and SSB), and a resource allocation method. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0109] Referring to FIG. 6a, the band operated by a base station according to one embodiment of the present disclosure may be divided into subband s0 (601), subband s1 (602), subband s2 (603), and subband s3 (604). A base station according to one embodiment of the present disclosure may transmit CSI-RS (605) at a specific period over the entire band and may transmit SSB (606) at a specific period in a specific band. For example, a base station may transmit CSI-RS (605) at a period of 160ms over the entire band (s0 (601), s1 (602), s2 (603), s3 (604)) and may transmit SSB (606) at a period of 20ms in subband s1 (602).

[0110] At this time, the base station may instruct the terminal to measure the path attenuation value for subband s1 (602) based on the SSB (606) via RRC or DCI, and to measure the path attenuation value for subbands excluding subband s1 (602) (s0 (601), s2 (603), s3 (604)) based on CSI-RS (605). Accordingly, the terminal measures the path attenuation value for subband s1 (602) based on the SSB (606) received from the base station. (608)) can be measured. Additionally, for subbands where SSB (606) is not transmitted (e.g., s0 (601), s2 (603), s3 (604)), the terminal can measure the path attenuation value for each subband (e.g., s0 (601), s2 (603), s3 (604)) based on CSI-RS (605). (607), (609), (610)) can be measured. Through this, the terminal can obtain individual channel state information for each subband.

[0111] Referring to FIG. 6b, a terminal according to one embodiment of the present disclosure can determine uplink power per subband based on measured path attenuation values ​​per subband. According to one embodiment of the present disclosure, among a plurality of subbands (s0 (601), s1 (602), s2 (603), s3 (604)), at least one subband for uplink transmission (e.g., subband s0 (601) and subband s1 (602)) may be indicated from a base station. For example, the at least one subband may be indicated by a DCI that schedules PUSCH.

[0112] The terminal has path attenuation values ​​for subband s0 (601) and subband s1 (602) ( (607), Based on (608)), the uplink power for subbands s0 (601) and s1 (602) can be determined. Here, the path attenuation value for subband s0 (601) ( (607)) is based on CSI-RS (605) and path attenuation value for subband s1 (602) ( (608)) may be based on SSB (606). In this case, each subband s i The uplink power for (i is an integer greater than or equal to 0) can be calculated as shown in Equation 2 above.

[0113] The terminal can calculate the total uplink power by summing the uplink power for each subband si. For example, the terminal can calculate the total uplink power by summing the uplink power determined for subband s0 (601) and the uplink power determined for subband s1 (602). At this time, the total uplink power can be calculated as in Equation 3 described above.

[0114] FIGS. 7a and 7b are drawings illustrating a method for performing subband-specific power control for PUCCH or SRS transmission using subband-specific path attenuation values ​​based on CSI-RS and SSB in one embodiment of the present disclosure.

[0115] A base station according to one embodiment of the present disclosure may instruct a terminal, through RRC signaling, a subband division method, the location of a reference signal to be measured (e.g., CSI-RS and SSB), and a resource allocation method. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0116] Referring to FIG. 7a, the band operated by a base station according to one embodiment of the present disclosure may be divided into subband s0 (701), subband s1 (702), subband s2 (703), and subband s3 (704). A base station according to one embodiment of the present disclosure may transmit CSI-RS (705) at a specific period over the entire band and may transmit SSB (706) at a specific period in a specific band. For example, a base station may transmit CSI-RS (705) at a period of 160ms over the entire band (s0 (701), s1 (702), s2 (703), s3 (704)) and may transmit SSB (706) at a period of 20ms in subband s1 (702).

[0117] At this time, the base station may instruct the terminal to measure the path attenuation value for subband s1 (602) based on the SSB (706) via RRC or DCI, and to measure the path attenuation value for subbands excluding subband s1 (702) (s0 (701), s2 (702), s3 (703)) based on CSI-RS (705). Accordingly, the terminal measures the path attenuation value for subband s1 (702) based on the SSB (706) received from the base station. (708)) can be measured. Additionally, for subbands where SSB (706) is not transmitted (e.g., s0 (701), s2 (703), s3 (704)), path attenuation values ​​for each subband (e.g., s0 (701), s2 (703), s3 (704)) can be measured based on CSI-RS (705). (707), (709), (710)) can be measured. Through this, the terminal can obtain individual channel state information for each subband.

[0118] Referring to FIG. 7b, a terminal according to one embodiment of the present disclosure can determine uplink power per subband based on measured path attenuation values ​​per subband. According to one embodiment of the present disclosure, the terminal can transmit SRS (711) over the entire bandwidth (s0 (701), s1 (702), s2 (703), s3 (704)), and can determine power for SRS (711) transmission per subband. At this time, the terminal has path attenuation values ​​( (707), (708), (709), Based on (710), power for SRS (711) transmission for each subband (s0 (701), s1 (702), s2 (703), s3 (704)) can be determined. At this time, for each subband s i The power for SRS (711) transmission for (i is an integer greater than or equal to 0) can be calculated as shown in the following mathematical formula 4.

[0119]

[0120] Here, Each subband s i It may be a path attenuation value calculated for, is each subband s i SRS (711) may be the number of scheduled RBs. For the remaining parameters, refer to Equation 1 described above. Here, silver (707), silver (708), silver (709), silver It can be referred to as (710).

[0121] The terminal can calculate the total power for SRS (711) transmission by summing the power for SRS (711) transmission for each subband si. At this time, the total power for SRS (711) transmission can be calculated as shown in the following mathematical formula 5.

[0122]

[0123] Here, is power for SRS (711) transmission for each subband si, and The total power for SRS (711) transmission may be available.

[0124] Meanwhile, although the above-described embodiment was explained as an example where the terminal transmits SRS (711) as an uplink signal, it can be applied in the same way when transmitting PUCCH. At this time, each subband s i The power for PUCCH transmission for (i is an integer greater than or equal to 0) can be calculated as shown in Equation 6 below.

[0125]

[0126] Here, Each subband s i It may be a path attenuation value calculated for, is each subband s i PUCCH can be the number of RBs scheduled. For the remaining parameters, refer to Equation 1 described above.

[0127] The terminal can calculate the total power for PUCCH transmission by summing the power for PUCCH transmission for each subband si. At this time, the total power for PUCCH transmission can be calculated as shown in the following Equation 7.

[0128]

[0129] Here, can be the power for PUCCH transmission for each subband si, and It can be the power for total PUCCH transmission.

[0130] FIGS. 8a and 8b are drawings for explaining a method of performing subband-specific power control by having a base station indicate different target PSDs for each subband in one embodiment of the present disclosure.

[0131] According to the existing 5G NR PUSCH power control method, the terminal receives a reception power target value instructed by the base station at a specific PUSCH transmission power ( ), path loss compensation index( ), and closed-loop power control values( By receiving the ) you can calculate the PUSCH transmission power as in Equation 1.

[0132] According to one embodiment of the present disclosure, a method is proposed in which a base station instructs a different target Power Spectral Density (PSD) for each subband to perform power control for each subband. More specifically, for uplink power control for each subband, the base station provides a subband-specific received power target value ( ) and / or path loss compensation index per subband ( ) can be set. In addition, the base station provides the terminal with subband-specific closed-loop power control values ​​( It can instruct ).

[0133] According to one embodiment of the present disclosure, a terminal [is] a subband-specific as indicated by a base station via an RRC message and / or DCI. , , and Based on this, the uplink power for each subband can be determined. At this time, for each subband s i The uplink power for (i is an integer greater than or equal to 0) can be calculated as shown in the following mathematical formula 8.

[0134]

[0135] Here, Each subband s i It can be a received power target value set for, is each subband s i It may be a path loss compensation index set for, and is each subband s i It may be a closed-loop power control value per subband set for. For the remaining parameters, refer to Equation 1 described above.

[0136] The terminal can calculate the total uplink power by summing the uplink power for each subband si. At this time, the total uplink power can be calculated as shown in Equation 9.

[0137]

[0138] Here, can be the uplink power for each subband si, and It can be the total uplink power.

[0139] More specifically, with reference to FIG. 8a, the base station provides the terminal with a subband-specific received power target value ( ) and / or path loss compensation index per subband ( We will describe an example of setting )

[0140] Referring to FIG. 8a, there may be Cell 0 (801) and Cell 1 (802) with different starting RB values. In this case, Cell 1 (802) may be a neighbor cell of Cell 0 (801). The two base stations operating Cell 0 (801) and Cell 1 (802), respectively, can exchange traffic information (e.g., RB usage information) with each other.

[0141] At this time, if the RB utilization rate in Cell 0 (801) is low, the frequency band in which Cell 0 (801) receives PUSCH and the frequency band in which Cell 1 (802) receives PUSCH may not overlap. On the other hand, as the RB utilization rate in Cell 0 (801) increases, a situation may occur in which a specific subband (e.g., subband s2) among the frequency bands in which Cell 0 (801) receives PUSCH overlaps with the frequency band in which Cell 1 (802) receives PUSCH. In this case, the base station operating Cell 0 (801) has a reception power target value for the overlapping subband si ( ) and / or path loss compensation index ( ) can be adjusted depending on the situation.

[0142] For example, if the base station prioritizes the performance of Cell 0 (801) in an overlapping subband si, the received power target value for the subband si (e.g., subbands s0, s1, s3) to expect a SINR similar to that of subbands not overlapping with Cell 1 (802) ) and / or path loss compensation index ( By increasing ), the PUSCH power in the corresponding subband si can be increased.

[0143] On the other hand, when prioritizing the performance of Cell 1 (802) in the overlapping subband si of the base station, in order to reduce interference affecting Cell 1 (802), the received power target value for the subband si ( ) and / or path loss compensation index ( By reducing ), the PUSCH power in the corresponding subband si can be reduced.

[0144] Referring to FIG. 8b, the base station provides the terminal with subband-specific closed-loop power control values ​​( We will explain an example of an embodiment that indicates ).

[0145] A base station according to one embodiment of the present disclosure can measure average NI (noise plus interference) and / or IIR filtered NI (infinite impulse response filtered noise and interference) per subband. In this case, the base station dynamically calculates a closed-loop power control value per subband ( taking into account the NI per subband). ) can be instructed to the terminal via DCI.

[0146] More specifically, referring to FIG. 8b, the base station may dynamically or periodically measure and monitor the respective NI values ​​(NI0, NI1, NI2, NI3) for subbands (s0, s1, s2, s3). For example, if a large NI value is observed in a specific subband, the base station [sets] a closed-loop power control value ( To secure sufficient SINR by adjusting ) upward, and conversely to avoid allocating excessive power to subbands with low NI values, the closed-loop power control value ( for the corresponding subband) By lowering ), uniform uplink transmission quality can be achieved across the entire frequency bandwidth.

[0147] At this time, the base station has a closed-loop power control value for each subband ( You may direct ) to all subbands, or you may direct it to only at least one subband to which PUSCH is assigned.

[0148] Meanwhile, although the above-described embodiment was explained using the example of a terminal transmitting PUSCH as an uplink signal, it can be applied in the same way when transmitting SRS or PUCCH. In this case, each subband s iThe power for SRS transmission for (i is an integer greater than or equal to 0) can be calculated as shown in Equation 10 below, and for each subband s i The power for PUCCH transmission for (i is an integer greater than or equal to 0) can be calculated as shown in Equation 11 below, and

[0149]

[0150] Here, Each subband s i It can be a received power target value set for, is each subband s i It may be a path loss compensation index set for, and is each subband s i It may be a closed-loop power control value per subband set for. For the remaining parameters, refer to Equation 1 described above.

[0151]

[0152] Here, Each subband s i It can be a received power target value set for, is each subband s i It may be a closed-loop power control value per subband set for. For the remaining parameters, refer to Equation 1 described above.

[0153] The terminal can calculate the total power for SRS or PUCCH transmission by summing the power for SRS or PUCCH transmission for each subband si. At this time, the total power for SRS transmission can be calculated as shown in Equation 12 below, and the total power for PUCCH transmission can be calculated as shown in Equation 13 below.

[0154]

[0155] Here, can be the power for SRS transmission for each subband si, and It can be the total power for SRS transmission.

[0156]

[0157] Here, can be the power for PUCCH transmission for each subband si, and It can be the power for total PUCCH transmission.

[0158] FIGS. 9a and 9b are drawings for explaining a sub-band power adjustment method when the total uplink power exceeds the maximum transmission power in one embodiment of the present disclosure.

[0159] The total uplink power calculated by summing the uplink power per subband according to the various embodiments described above is the maximum transmission power ( If it exceeds ), the uplink power per subband can be adjusted through the following methods. Here, the base station uses RRC signaling or DCI to adjust the maximum transmission power ( Information including ) can be set, and the terminal can adjust the uplink power for each subband in consideration of this.

[0160] - Method 1: Maximum transmission power ( A method of distributing ) to each subband according to the power ratio of each subband.

[0161] - Method 2: A method of preferentially distributing power to subbands with a large number of allocated RBs.

[0162] - Method 3: A method of distributing power in ascending or descending order of subband indices.

[0163] - Method 4: Maximum allowable power per subband set by the base station via RRC message ( A method for determining power per subband based on ).

[0164] Below, each method will be described in more detail with reference to FIGS. 9a to 9c.

[0165] Referring to FIG. 9a, a terminal according to one embodiment of the present disclosure has a total uplink power of maximum transmission power ( If ) is exceeded, maximum transmission power ( ) can be distributed to each subband according to the power ratio for each subband.

[0166] For example, the maximum transmission power set from the base station ( There may exist a terminal where ) is 23dBm and PUSCH resources are allocated to Sub-band 0 and Sub-band 1, with 64 RB each. If the calculated PUSCH power per RB for Sub-band 0 is 2dBm, the virtual PUSCH power calculated for Sub-band 0 is It may be. If the PUSCH power per RB calculated for subband 1 is 5dBm, the virtual PUSCH power calculated for subband 1 is It can be. In this case, the virtual PUSCH power calculated for subband 0 ( Virtual PUSCH power calculated for ) and subband 1 ( The sum of ) is Therefore, this is the maximum transmission power ( It may be a value exceeding ).

[0167] At this time, the terminal can adjust the PUSCH power for each subband according to the above-described method 1. The terminal has a maximum transmission power ( ) virtual PUSCH power calculated for subband 0 ( Virtual PUSCH power calculated for ) and subband 1 ( It can be distributed to each subband according to the ratio of ).

[0168] Accordingly, the actual PUSCH power for subband 0 is It may be, and the actual PUSCH power for subband 1 is It could be.

[0169] Referring to FIG. 9b, a terminal according to one embodiment of the present disclosure has a total uplink power of maximum transmission power ( If it exceeds ), power can be distributed preferentially to the subband with a large number of allocated RBs.

[0170] For example, the maximum transmission power set from the base station ( There may exist a terminal where ) is 23dBm and PUSCH resources are allocated as 64 RB to Subband 0 and 32 RB to Subband 1. If the calculated PUSCH power per RB for Subband 0 is 2dBm, the virtual PUSCH power calculated for Subband 0 is It may be. If the PUSCH power per RB calculated for subband 1 is 5dBm, the virtual PUSCH power calculated for subband 1 is It can be. In this case, the virtual PUSCH power calculated for subband 0 ( Virtual PUSCH power calculated for ) and subband 1 ( The sum of ) is Therefore, this is the maximum transmission power ( It may be a value exceeding ).

[0171] At this time, the terminal can adjust the PUSCH power for each subband according to the above-described method 2. The terminal preferentially distributes power to subband 0, which has a large number of allocated RBs, and the maximum transmission power ( The difference in power distributed for ) and subband 0 can be distributed to subband 1.

[0172] Accordingly, the actual PUSCH power for subband 0 is It may be, and the actual PUSCH power for subband 1 is It could be.

[0173] Referring to FIG. 9c, a terminal according to one embodiment of the present disclosure has a total uplink power of maximum transmission power ( If it exceeds ), power can be distributed in ascending or descending order of the subband index.

[0174] For example, the maximum transmission power set from the base station ( There may exist a terminal where ) is 23dBm and PUSCH resources are allocated to Sub-band 0 and Sub-band 1, with 64 RB each. If the calculated PUSCH power per RB for Sub-band 0 is 2dBm, the virtual PUSCH power calculated for Sub-band 0 is It may be. If the PUSCH power per RB calculated for subband 1 is 5dBm, the virtual PUSCH power calculated for subband 1 is It can be. In this case, the virtual PUSCH power calculated for subband 0 ( Virtual PUSCH power calculated for ) and subband 1 ( The sum of ) is Therefore, this is the maximum transmission power ( It may be a value exceeding ).

[0175] At this time, the terminal can adjust the PUSCH power for each subband according to the above-described method 3. The terminal preferentially distributes power to subband 0 according to the ascending order of the subband index, and the maximum transmission power ( The difference in power distributed for ) and subband 0 can be distributed to subband 1.

[0176] Accordingly, the actual PUSCH power for subband 0 is It may be, and the actual PUSCH power for subband 1 is It could be.

[0177] Additionally, the terminal has the maximum allowable power per subband set by the base station according to method 4 ( Power per subband can be determined based on ). In this case, the terminal sets the maximum allowable power per subband (si, where i is an integer greater than or equal to 0) for each subband ( The actual PUSCH power for each subband can be adjusted so as not to exceed ).

[0178] FIGS. 10a to 10c are drawings for explaining a method in which a terminal transmits a PHR to a base station in one embodiment of the present disclosure.

[0179] According to one embodiment of the present disclosure, a terminal can transmit a Power Headroom Report (PHR) related to uplink transmission to a base station. The terminal has the power actually used for uplink transmission and the maximum allowable power set for the terminal ( By reporting the difference between ) to the base station, it can help the base station identify the terminal's power reserve and perform interference control or resource allocation more effectively.

[0180] Referring to FIG. 10a, a terminal according to one embodiment of the present disclosure has a maximum allowable power ( The Power Headroom (PH) value can be calculated by subtracting the total uplink power from ).

[0181] For example, the maximum transmission power set from the base station ( There may exist a terminal where ) is 30dBm and PUSCH resources are allocated as 64 RB to Subband 0 and 32 RB to Subband 1. If the PUSCH power per RB calculated for Subband 0 is 2dBm and the PUSCH power per RB calculated for Subband 1 is 5dBm, the total PUSCH power across the entire band is It may be. Accordingly, the pH value to be reported It can be calculated as.

[0182] Referring to FIGS. 10b and 10c, a terminal according to one embodiment of the present disclosure can set an index corresponding to a calculated PH value based on a predetermined PHR mapping table in the Power headroom field of a MAC (medium access control) CE (control element) for PHR.

[0183] Referring to FIG. 10b, the MAC CE may include a Power headroom field (1001) of 6 bits in length, and accordingly, a PHR mapping table (1002) with a total of 64 indices defined from POWER_HEADROOM_0 to POWER_HEADROOM_63 may be used. When the terminal calculates a PH value, it may report to the base station an index (e.g., POWER_HEADROOM_X) corresponding to the "Measured quantity value (dB)" range to which the PH value belongs, by including it in the Power headroom field (1001) within the MAC CE.

[0184] Referring to FIG. 10c, the MAC CE may include a Power headroom field (1003) of 8 bits in length, and accordingly, a PHR mapping table (1004) with a total of 256 indices defined from POWER_HEADROOM_0 to POWER_HEADROOM_255 may be used. When the terminal calculates a PH value, it may report to the base station an index (e.g., POWER_HEADROOM_X) corresponding to the "Measured quantity value (dB)" range to which the PH value belongs, by including it in the Power headroom field (1003) within the MAC CE.

[0185] Subsequently, the base station can infer the actual PH range reported by the terminal by interpreting the index expressed in 6 bits or 8 bits in the received MAC CE. Through this, the base station can specifically estimate the terminal's power margin and utilize the information for various wireless resource management algorithms, such as dynamic scheduling, interference control, and power management.

[0186] FIGS. 11a to 11e are drawings for explaining a method in which a terminal transmits a subband-specific PHR to a base station in one embodiment of the present disclosure.

[0187] According to one embodiment of the present disclosure, a terminal can transmit a Power Headroom Report (PHR) for each subband related to uplink transmission to a base station. The terminal can transmit the power used for the actual uplink transmission for each subband and the maximum allowable power set for the terminal ( By reporting the difference between ) to the base station by subband, it can help the base station identify the power reserve of the terminal by subband and perform interference control or resource allocation more effectively.

[0188] Referring to FIG. 10a, a terminal according to one embodiment of the present disclosure has a maximum allowable power ( By subtracting the uplink power per subband from ), per subband You can calculate the value of (Power Headroom, i is an integer greater than or equal to 0).

[0189] For example, the maximum transmission power set from the base station ( There may exist a terminal where ) is 30dBm and PUSCH resources are allocated as 64 RB to Subband 0 and 16 RB to Subband 1. If the PUSCH power per RB calculated for Subband 0 is 2dBm, the PUSCH power calculated for Subband 0 ( )silver It may be. If the PUSCH power per RB calculated for subband 1 is 5dBm, the PUSCH power calculated for subband 1 ( )silver It may be. Accordingly, regarding subband 0 The value It can be calculated as, and for subband 1 The value It can be calculated as.

[0190] Referring to FIGS. 11b through 11d, a terminal according to one embodiment of the present disclosure, based on a predetermined PHR mapping table, calculates the subbands An index corresponding to the value can be set in at least one Power headroom field of the MAC CE for the PHR.

[0191] Referring to FIG. 11b, MAC CE may include a Power headroom field (1101) of 6 bits in length for each subband for all subbands, and accordingly, a PHR mapping table (1102) with a total of 64 indices defined from POWER_HEADROOM_0 to POWER_HEADROOM_63 may be used.

[0192] A terminal according to one embodiment of the present disclosure is calculated for each subband All values ​​can be mapped to the PHR mapping table (1102), and the mapped subband index i can be included in the Power headroom field (1101) for each and reported to the base station. By interpreting the received MAC CE, the base station can determine in detail how much power margin each subband has.

[0193] Referring to Fig. 11c, MAC CE is of the first subband It may include a 6-bit Power headroom field (1103) for, and accordingly, a PHR mapping table (1105) with a total of 64 indices defined from POWER_HEADROOM_0 to POWER_HEADROOM_63 may be used. Additionally, MAC CE of the remaining subbands and A PH difference mapping table (1106) may be used, which may include at least one 4-bit length Power headroom field (1104) for the difference, and accordingly, a total of 16 indices from PH Δ_0 to PH Δ_15 are defined.

[0194] According to one embodiment of the present disclosure, the terminal has a first subband in a PHR mapping table (1105). An index corresponding to the value can be included in a 6-bit Power headroom field (1103) within the MAC CE. Subsequently, the terminal can include the remaining subbands within the PH difference mapping table (1106). value and the first subband At least one index corresponding to the difference of the value can be included in the Power headroom field (1104) of 4 bits in the MAC CE. In this way, the bit usage of the MAC CE can be reduced compared to independently mapping the PH values ​​of all subbands to 6 bits, and PH information for multiple subbands can be transmitted to the base station with relatively little overhead.

[0195] According to one embodiment of the present disclosure, the number of PHs per subband that can be reported within a single PHR transmission may be limited according to the terminal's capability. In this case, the terminal may notify the base station via a UE Capability message of information indicating the number of PHs per subband that can be reported within a single PHR transmission. Based on the terminal capability, the base station may assign a priority to the subbands that the terminal must report and instruct the terminal via an RRC message and / or DCI. In this case, the terminal may configure and transmit the PHR according to FIG. 11b to 11c described above only for the subbands with relatively higher priority, according to the priority of the subbands instructed by the base station.

[0196] At this time, an embodiment in which the terminal selectively reports a PH value for a subband when the terminal has not been instructed on the priority of the subband from the base station will be described with reference to FIG. 11d and FIG. 11e.

[0197] Referring to FIG. 11d, the terminal may additionally include a subband PHR indicator field (1107) in the MAC CE. In this case, the subband PHR indicator field (1107) may indicate at least one subband to which a PH value is to be reported in a bitmap format. For example, if eight subbands are in operation, the terminal may correspond the lower 8 bits of the bitmap within the subband PHR indicator field (1107) to subbands 0 through 7 (s0, s1, s7), respectively. In this case, the bit corresponding to the position of the subband to which the PH value is to be reported may be set to 1, and the bit corresponding to the position of the subband not to be reported may be set to 0.

[0198] According to one embodiment of the present disclosure, the MAC CE may include a Power headroom field (1108) of 6 bits in length for each subband for the selected subband, and accordingly, a PHR mapping table (1109) with a total of 64 indices defined from POWER_HEADROOM_0 to POWER_HEADROOM_63 may be used.

[0199] A terminal according to one embodiment of the present disclosure is calculated for each selected subband Value (e.g.: ) can be mapped to the PHR mapping table (1109), and the mapped subband index i can be included in the Power headroom field (1108) respectively and reported to the base station.

[0200] Referring to FIG. 11e, the terminal may additionally include a subband PHR indicator field (1107) in the MAC CE. For a description of the subband PHR indicator field (1107), refer to the description in FIG. 11d.

[0201] According to one embodiment of the present disclosure, MAC CE is calculated for a selected subband Value (e.g.: ) and calculated for the first subband It may include at least one Power headroom field (1110) of length 4 bits for the difference, and accordingly, a PH difference mapping table (1111) with a total of 16 indices defined from PH Δ_0 to PH Δ_15 may be used.

[0202] According to one embodiment of the present disclosure, the terminal is of a subband selected within a PH difference mapping table (1111). Value (e.g.: ) and the first subband of At least one index corresponding to the difference of the value can be included in the Power headroom field (1110) of 4 bits in the MAC CE.

[0203] FIG. 12 is a diagram illustrating a method for a terminal to control uplink power by subband in one embodiment of the present disclosure.

[0204] Referring to FIG. 12, the operation of a terminal according to the embodiments of FIG. 1 to FIG. 11 proposed in the present disclosure is illustrated.

[0205] In step S1210, a terminal according to one embodiment of the present disclosure may receive configuration information from a base station indicating a plurality of subbands for an uplink. A base station (BS) according to one embodiment of the present disclosure may instruct the terminal, through RRC signaling, a method for subband division, the location of a reference signal to be measured (e.g., CSI-RS (Channel State Information Reference Signal) and / or SSB (Synchronization Signal Block)), and a method for resource allocation. Through this, the terminal may recognize which frequency range to consider as a subband and which reference signal to use in each subband to measure RSRP and / or path loss.

[0206] In step S1220, a terminal according to one embodiment of the present disclosure may receive at least one downlink reference signal from a base station. A base station (BS) according to one embodiment of the present disclosure may transmit CSI-RS and / or SSB to the terminal. At this time, the base station may transmit CSI-RS and / or SSB to the terminal to enable the terminal to measure RSRP and / or path loss by subband. The base station may periodically transmit CSI-RS over the entire bandwidth or transmit SSB intensively to a specific subband to enable the terminal to estimate accurate channel conditions on a subband basis.

[0207] In step S1230, a terminal according to one embodiment of the present disclosure can determine a subband-specific uplink power for at least one subband indicated by DCI among a plurality of subbands based on at least one downlink reference signal.

[0208] A terminal (UE) according to one embodiment of the present disclosure can calculate RSRP and / or path loss for each subband based on CSI-RS and / or SSB received from a base station. In this case, the terminal may calculate an independent path loss value for each subband by considering the measurement method and parameters instructed by the base station, or, if necessary, infer a path loss value using RSRP. Specifically, the terminal can determine the path loss value for each subband by calculating the difference between the RSRP measured in each subband and the CSI-RS and / or SSB transmission power set by the base station. Additionally, if the base station obtains uplink measurement values ​​through the Sounding Reference Signal (SRS) received from the terminal, the base station may also estimate the path loss value for each subband and transmit it to the terminal.

[0209] A terminal (UE) according to one embodiment of the present disclosure may determine uplink power for each subband based on measured RSRP and / or path loss values ​​for each subband. A terminal according to one embodiment of the present disclosure may determine uplink power for each subband for at least one subband indicated by Downlink Control Information (DCI) from a base station among a plurality of subbands. At this time, the terminal may determine uplink power for each subband by considering together the received power target value and / or path loss compensation coefficient for each subband, which are set by RRC signaling from the base station, and the closed-loop power control value for each subband, which is dynamically indicated by the DCI. In the process of determining uplink power for each subband, the terminal may determine the optimal uplink power that corresponds to the target Signal to Interference plus Noise Ratio (SINR) for each subband by comprehensively reflecting parameters for each subband.

[0210] In step S1240, a terminal according to one embodiment of the present disclosure can transmit an uplink signal to a base station based on the uplink power for each subband.

[0211] FIG. 13 is a drawing illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0212] Referring to FIG. 13, the terminal (1300) may be composed of a transceiver (1310), a processor (1320), and a memory (1330). Depending on the communication method of the terminal (1300) described above, the transceiver (1310), the processor (1320), and the memory (1330) of the terminal (1300) may operate. However, the components of the terminal (1300) are not limited to the examples described above. For example, the terminal (1300) may include more components or fewer components than the components described above. In one embodiment, the transceiver (1310), the processor (1320), and the memory (1330) may be implemented in the form of a single chip. Additionally, the processor (1320) may include one or more processors.

[0213] The transceiver (1310) is a collective term for the receiver and the transmitter of the terminal (1300), and can transmit and receive signals with a network entity including a base station. The signals transmitted and received with the network entity including the base station may include control information and data. To this end, the transceiver (1310) may be composed of an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that low-noise amplifies the received signal and down-converts the frequency. However, this is one embodiment of the transceiver (1310), and the components of the transceiver (1310) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1310) may include a wired / wireless transceiver and may include various configurations for transmitting and receiving signals. Additionally, the transceiver (1310) can receive a signal through a wireless channel and output it to a processor (1320), and transmit the signal output from the processor (1320) through a wireless channel. Additionally, the transceiver (1310) can receive a communication signal and output it to a processor, and transmit the signal output from the processor to a network entity through a wired or wireless network.

[0214] The memory (1330) can store programs and data necessary for the operation of the terminal (1300). Additionally, the memory (1330) can store control information or data included in signals obtained from the terminal (1300). The memory (1330) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, the memory (1330) may not exist separately but may be configured to be included in the processor (1320). The memory (1330) may be composed of volatile memory, non-volatile memory, or a combination of volatile and non-volatile memory. Furthermore, the memory (1330) can provide stored data upon the request of the processor (1320).

[0215] The processor (1320) can control a series of processes to enable the terminal (1300) to operate according to the embodiments of the present disclosure described above. For example, the processor (1320) can receive control signals and data signals through the transceiver (1310) and process the received control signals and data signals. The processor (1320) can transmit the processed control signals and data signals through the transceiver (1310). Additionally, the processor (1320) can write or read data to or from the memory (1330). The processor (1320) can perform the functions of a protocol stack required by a communication standard. To this end, the processor (1320) may include at least one processor or microprocessor. In one embodiment, a part of the transceiver (1310) or the processor (1320) may be referred to as a communication processor (CP).

[0216] The processor (1320) may be composed of one or more processors. In this case, the one or more processors may be general-purpose processors such as CPUs, APs, and DSPs (Digital Signal Processors), graphics-dedicated processors such as GPUs and VPUs (Vision Processing Units), or artificial intelligence-dedicated processors such as NPUs. For example, if one or more processors are artificial intelligence-dedicated processors, the artificial intelligence-dedicated processors may be designed with a hardware structure specialized for processing a specific artificial intelligence model.

[0217] The processor (1320) can control the overall operation of the terminal according to the embodiment proposed in the present disclosure. For example, the processor (1320) can control the signal flow between each block to perform the operation of FIGS. 1 to FIGS. 12 described above.

[0218] In one embodiment, the processor (1320) may receive configuration information indicating a plurality of subbands for an uplink through the transceiver (1310). The processor (1320) may receive at least one downlink reference signal through the transceiver (1310). Based on the at least one downlink reference signal, the processor (1320) may determine the uplink power for each subband for at least one subband indicated by DCI (Downlink Control Information) among the plurality of subbands. The processor (1320) may transmit an uplink signal based on the uplink power for each subband through the transceiver (1310).

[0219] FIG. 14 is a drawing illustrating the structure of a base station according to one embodiment of the present disclosure.

[0220] Referring to FIG. 14, a base station (1400) may be composed of a transceiver (1410), a processor (1420), and a memory (1430). Depending on the communication method of the base station (1400) described above, the transceiver (1410), the processor (1420), and the memory (1430) of the base station (1400) may operate. However, the components of the base station (1400) are not limited to the examples described above. For example, the base station (1400) may include more components or fewer components than the components described above. In one embodiment, the transceiver (1410), the processor (1420), and the memory (1430) may be implemented in the form of a single chip. Additionally, the processor (1420) may include one or more processors.

[0221] The transceiver (1410) can transmit and receive signals with a terminal or another base station. Here, the signal may include control information and data. To this end, the transceiver (1410) 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 (1410), and the components of the transceiver (1410) are not limited to an RF transmitter and an RF receiver.

[0222] Additionally, the transceiver (1410) receives a signal through a wireless channel and outputs it to a processor (1420), and can transmit the signal output from the processor (1420) through a wireless channel.

[0223] The memory (1430) can store programs and data necessary for the operation of the base station (1400). Additionally, the memory (1430) can store control information or data included in signals transmitted and received by the base station (1400). The memory (1430) may 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 memory units.

[0224] A processor (1420) can control a series of processes to enable the base station (1400) to operate according to the embodiments of the present disclosure described above. For example, the processor (1420) can control each component of the base station (1400) to set and transmit at least one control information and / or parameter for determining the uplink power for each subband of the terminal. There may be multiple processors (1420), and the processor (1420) can perform component control operations of the base station (1400) by executing a program stored in memory (1430).

[0225] 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.

[0226] 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.

[0227] 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.

[0228] 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.

[0229] In the specific embodiments of the present disclosure described above, the components included in the invention 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, or even if a component is expressed in the singular form, it may be composed of a plural form.

[0230] Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are merely specific examples provided to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the present disclosure, and are not intended to limit the scope of the present disclosure. That is, it is obvious to those skilled in the art that other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, parts of one embodiment of the present disclosure and parts of another embodiment may be combined to operate a base station and a terminal. For example, parts of the first embodiment and the second embodiment of the present disclosure may be combined to operate a base station and a terminal. In addition, although the above embodiments are presented based on an FDD LTE system, other variations based on the technical concept of the above embodiments may be implemented in other systems such as a TDD LTE system, 5G, or NR system.

[0231] Meanwhile, the order of description in the drawings illustrating the method of the present invention does not necessarily correspond to the order of execution, and the order of execution may be changed or executed in parallel.

[0232] Alternatively, drawings describing the method of the present invention may omit some components and include only some components to the extent that the essence of the present invention is not compromised.

[0233] In addition, the method of the present invention may be implemented by combining some or all of the contents included in each embodiment within a scope that does not impair the essence of the invention.

[0234] In the specific embodiments of the present invention described above, the components included in the invention 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 invention is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed in the singular form, or even if a component is expressed in the singular form, it may be composed in the plural form.

[0235] Meanwhile, although specific embodiments have been described in the detailed description of the present invention, it is understood that various modifications are possible within the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof. In other words, it is obvious to those skilled in the art that other modifications based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, parts of the methods proposed in the present disclosure may be combined to operate a base station and a terminal. Additionally, while the above embodiments have been presented based on 5G and NR systems, other modifications based on the technical concept of the above embodiments may be implemented in other systems such as LTE, LTE-A, and LTE-A-Pro systems.

Claims

1. In a method of operation of a terminal in a wireless communication system, A step of receiving configuration information from a base station indicating a plurality of subbands for an uplink; A step of receiving at least one downlink reference signal from the base station; A step of determining uplink power for each subband for at least one subband indicated by DCI (Downlink Control Information) among the plurality of subbands based on the at least one downlink reference signal; and A method characterized by including the step of transmitting an uplink signal to the base station based on the uplink power for each subband.

2. In Paragraph 1, The above at least one downlink reference signal is characterized as being a CSI-RS (Channel State Information Reference Signal), and The step of determining the uplink power for each subband above is, Based on the above CSI-RS, the step of determining a subband-specific path loss for the at least one subband indicated by the DCI; and A step of determining the uplink power for each subband based on the path attenuation for each subband; A method characterized by including 3. In Paragraph 1, The above at least one downlink reference signal is characterized as being a Synchronization Signal Block (SSB) for the first subband, and The step of determining the uplink power for each subband above is, A step of transmitting an SRS (Sounding Reference Signal) to the above base station; A step of receiving from the base station information indicating the difference value between the path attenuation of the second subband and the path attenuation of the first subband, determined based on the above SRS; and A step of determining the uplink power for the first subband based on the path attenuation of the first subband determined based on the above SSB, and determining the uplink power for the second subband based on the difference value; A method characterized by including 4. In Paragraph 1, The above at least one downlink reference signal is characterized as being an SSB for CSI-RS and a first subband, and The step of determining the uplink power for each subband above is, A step of determining uplink power for the first subband based on path attenuation of the first subband determined based on the above SSB; and A step of determining the uplink power for the second subband based on the path attenuation of the second subband determined based on the above CSI-RS; A method characterized by including 5. In Paragraph 1, The above setting information includes a received power target value and a path attenuation compensation index for each of the plurality of subbands, and A method characterized in that the above DCI includes information indicating a closed-loop power control value for each of the plurality of subbands.

6. In Paragraph 1, If the sum of the uplink power for each subband exceeds the maximum uplink power, the maximum uplink power, The ratio of uplink power by subband above, Number of RBs (Resource Blocks) per subband, Subband index, or Maximum allowable uplink power per subband A method further comprising the step of distributing to at least one subband based on the above.

7. In Paragraph 1, A method further comprising the step of transmitting a Power Headroom Report (PHR), a Medium Access Control (MAC), and a Control Element (CE) to the base station based on the uplink power for each subband.

8. In a terminal of a wireless communication system, Transmitter / receiver; and It includes at least one processor coupled to the above-mentioned transmitting and receiving unit, and The above-mentioned at least one processor is, Receive configuration information from a base station, through the transceiver, indicating a plurality of subbands for an uplink, and Receive at least one downlink reference signal from the base station through the transceiver, and Based on the above at least one downlink reference signal, the uplink power for each subband is determined for at least one subband indicated by DCI (Downlink Control Information) among the plurality of subbands, and A terminal that transmits an uplink signal to the base station based on the uplink power for each subband through the above-mentioned transceiver.

9. In Paragraph 8, The above at least one downlink reference signal is characterized as being a CSI-RS (Channel State Information Reference Signal), and The above-mentioned at least one processor is, Based on the above CSI-RS, determine the subband-specific path loss for the at least one subband indicated by the above DCI, and A terminal that determines the uplink power for each subband based on the path attenuation for each subband.

10. In Paragraph 8, The above at least one downlink reference signal is characterized as being a Synchronization Signal Block (SSB) for the first subband, and The above-mentioned at least one processor is, Transmit an SRS (Sounding Reference Signal) to the above base station, and Information indicating the difference value between the path attenuation of the second subband and the path attenuation of the first subband, determined based on the above SRS, is received from the base station, and A terminal that determines uplink power for the first subband based on path attenuation of the first subband determined based on the above SSB, and determines uplink power for the second subband based on the difference value.

11. In Paragraph 8, The above at least one downlink reference signal is characterized as being an SSB for CSI-RS and a first subband, and The above-mentioned at least one processor is, The uplink power for the first subband is determined based on the path attenuation of the first subband determined based on the above SSB, and A terminal that determines uplink power for the second subband based on path attenuation of the second subband determined based on the above CSI-RS.

12. In Paragraph 8, The above setting information includes a received power target value and a path attenuation compensation index for each of the plurality of subbands, and A terminal characterized in that the above DCI includes information indicating a closed-loop power control value for each of the plurality of subbands.

13. In Paragraph 8, The above-mentioned at least one processor is, If the sum of the uplink power for each subband exceeds the maximum uplink power, the maximum uplink power, The ratio of uplink power by subband above, Number of RBs (Resource Blocks) per subband, Subband index, or Maximum allowable uplink power per subband A terminal that distributes to at least one subband based on the above.

14. In Paragraph 8, The above-mentioned at least one processor is, A terminal that transmits PHR (Power Headroom Report), MAC (medium access control), and CE (control element) to the base station based on the uplink power for each subband.

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