Method and apparatus for computing update path loss offset in network coordinated communication system

Abstract

A method performed by a user equipment (UE) in a wireless communication system is provided. The method includes receiving, via a first transmission and reception point (TRP), information about a path loss offset that is a difference between (i) a first path loss between the UE and the first TRP and (ii) a second path loss between the UE and a second TRP, determining a transmission power for an uplink transmission of the UE to the second TRP based on a downlink reference signal for the first path loss and the path loss offset, and performing the uplink transmission via the second TRP based on the transmission power.

Description

Technical Field

[0001] This disclosure relates to the operation of user equipment (UE) and base station (BS) in a wireless communication system. More specifically, this disclosure relates to a method for calculating and updating path loss offset in network cooperative communication, and an apparatus capable of performing the method. Background Technology

[0002] Fifth-generation (5G) mobile communication technology defines a wide frequency band, enabling high transmission rates and new services. It can be implemented not only in bands "below 6 GHz" (such as 3.5 GHz) but also in bands "above 6 GHz" (including 28 GHz and 39 GHz), known as millimeter waves. Furthermore, implementation of sixth-generation (6G) mobile communication technology (called "super 5G systems") in terahertz bands (e.g., the 95 GHz to 3 THz band) is being considered to achieve transmission rates 50 times faster than 5G and ultra-low latency one-tenth that of 5G.

[0003] In the early stages of 5G mobile communication technology development, in order to support services and meet the performance requirements of enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), standardization has been carried out on the following technologies: beamforming and massive multiple-input multiple-output (MIMO) for mitigating radio wave path loss and increasing radio wave transmission distance in millimeter waves; dynamic operation supporting parameter sets (e.g., operating multiple subcarrier spacings) and time slot formats for efficient utilization of millimeter wave resources; initial access technologies supporting multi-beam transmission and broadband; definition and operation of bandwidth portion (BWP); new channel coding methods (such as low-density parity-check (LDPC) codes for large data transmissions and polar codes for highly reliable transmission of control information); layer 2 (L2) preprocessing; and network slicing for providing dedicated networks for specific services.

[0004] Currently, given the services that 5G mobile communication technology will support, discussions are underway regarding improvements and performance enhancements to the initial 5G mobile communication technology, and physical layer standardization already exists for technologies such as: Vehicle-to-Everything (V2X) for assisting autonomous vehicles in determining driving based on information about the location and status of vehicles transmitted by vehicles and for enhancing user convenience; New Radio Unlicensed (NR-U) designed to make system operation in unlicensed bands comply with various regulatory requirements; NR UE power saving; Non-Terrestrial Networks (NTNs) for UE-satellite direct communication to provide coverage in areas where communication with terrestrial networks is unavailable; and positioning.

[0005] Furthermore, standardization is underway in the wireless interface architecture / protocol domain for technologies such as: Industrial Internet of Things (IIoT) to support new services through interoperability and convergence with other industries; Integrated Access and Backhaul (IAB) for nodes to provide network service area extension by supporting wireless backhaul and access links in an integrated manner; mobility enhancements including conditional handover and Dual Active Protocol Stack (DAPS) handover; and two-step random access (RACH for NR) to simplify the random access process. In terms of system architecture / services, standardization is also underway for: 5G baseline architectures (e.g., service-based architectures or service-based interfaces) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies; and Mobile Edge Computing (MEC) for UE location-based reception services.

[0006] With the commercialization of 5G mobile communication systems, the number of connected devices will increase exponentially, making the functionality and performance of 5G mobile communication systems, as well as the integrated operation of connected devices, essential. To this end, new research is planned related to: Extended Reality (XR) for effectively supporting Augmented Reality (AR), Virtual Reality (VR), Mixed Reality (MR), etc.; improving 5G performance and reducing 5G complexity by leveraging Artificial Intelligence (AI) and Machine Learning (ML); AI service support; Metaverse service support; and drone communication.

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

[0008] The above information is provided for background information purposes only to aid in understanding this disclosure. No decision has been made, nor any assertion, is made regarding whether any of the above applies to the prior art of this disclosure. Summary of the Invention

[0009] Technical issues

[0010] The aspects of this disclosure at least address the aforementioned problems and / or disadvantages, and at least provide the advantages described below. Therefore, one aspect of this disclosure is to provide an apparatus and method capable of effectively providing services in a mobile communication system.

[0011] Another aspect of this disclosure is to provide a method for configuring parameters required to determine the transmit power of a transmit and receive point (TRP) that only supports uplink transmission.

[0012] Additional aspects will be set forth in part in the description which follows, and will be apparent in part from the description, or may be learned by practice of the given embodiments.

[0013] Technical solution

[0014] According to one aspect of this disclosure, a method performed by a user equipment (UE) in a wireless communication system is provided. The method includes: receiving information about a path loss offset via a first transmitting and receiving point (TRP), the path loss offset being the difference between (i) a first path loss between the UE and the first TRP and (ii) a second path loss between the UE and a second TRP; determining a transmit power for an uplink transmission to the second TRP based on a downlink reference signal for the first path loss and the path loss offset; and performing an uplink transmission via the second TRP based on the transmit power.

[0015] According to another aspect of this disclosure, a method performed by a base station in a wireless communication system is provided. The method includes: identifying a path loss offset, the path loss offset being (i) the difference between a first path loss between a user equipment (UE) and a first transmit and receive point (TRP) and (ii) a second path loss between the UE and a second TRP; transmitting information about the path loss offset to the UE via the first TRP; and receiving uplink transmissions based on transmit power from the UE via the second TRP, wherein the transmit power of the uplink transmissions for the second TRP is based on a downlink reference signal for the first path loss and the path loss offset.

[0016] According to another aspect of this disclosure, a user equipment (UE) in a wireless communication system is provided. The UE includes a transceiver and a processor coupled to the transceiver and configured to: receive information about a path loss offset via a first transmit and receive point (TRP), the path loss offset being the difference between (i) a first path loss between the UE and the first TRP and (ii) a second path loss between the UE and the second TRP; determine a transmit power for uplink transmission to the second TRP based on a downlink reference signal for the first path loss and the path loss offset; and perform uplink transmission via the second TRP based on the transmit power.

[0017] According to another aspect of this disclosure, a base station in a wireless communication system is provided. The base station includes a transceiver and a processor coupled to the transceiver and configured to: identify a path loss offset, the path loss offset being (i) the difference between a first path loss between a user equipment (UE) and a first transmit and receive point (TRP) and (ii) a second path loss between the UE and a second TRP; transmit information about the path loss offset to the UE via the first TRP; and receive uplink transmissions based on transmit power from the UE via the second TRP, wherein the transmit power of the uplink transmissions for the second TRP is based on a downlink reference signal for the first path loss and the path loss offset.

[0018] Beneficial effects

[0019] According to embodiments of this disclosure, services can be effectively provided in a mobile communication system.

[0020] Furthermore, according to embodiments of this disclosure, the path loss offset required to determine the transmit power of a TRP that only supports uplink transmission can be configured.

[0021] Furthermore, according to embodiments of this disclosure, uplink transmit power can be effectively managed.

[0022] Other aspects, advantages and key features of this disclosure will become apparent to those skilled in the art from the following detailed description, which, together with the accompanying drawings, discloses various embodiments of this disclosure. Attached Figure Description

[0023] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings, wherein:

[0024] Figure 1 The basic structure of the time-frequency domain in a wireless communication system according to an embodiment of the present disclosure is shown;

[0025] Figure 2 The structure of frames, subframes, and time slots in a wireless communication system according to embodiments of the present disclosure is shown;

[0026] Figure 3 An example of bandwidth configuration in a wireless communication system according to an embodiment of the present disclosure is shown;

[0027] Figure 4 The radio protocol structures of the base station and UE in single-cell, carrier aggregation, and dual connectivity scenarios in a wireless communication system according to embodiments of this disclosure are shown.

[0028] Figure 5The present disclosure illustrates beam application times that can be considered when using a unified transmit configuration indication (TCI) scheme in a wireless communication system according to embodiments of the present disclosure.

[0029] Figure 6 Another Media Access Control Element (MAC-CE) structure is shown according to an embodiment of the present disclosure for activating and indicating a joint TCI state or a separate downlink (DL) or uplink (UL) TCI state in a wireless communication system;

[0030] Figure 7 An example of the configuration of the control resource set of the downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown;

[0031] Figure 8 The structure of a downlink control channel in a wireless communication system according to an embodiment of the present disclosure is shown;

[0032] Figure 9 The process of beam configuration and activation of the Physical Downlink Shared Channel (PDSCH) according to an embodiment of this disclosure is illustrated;

[0033] Figure 10 An example of antenna port configuration and resource allocation for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown;

[0034] Figure 11 An example of downlink control information (DCI) configuration for cooperative communication in a wireless communication system according to an embodiment of the present disclosure is shown;

[0035] Figure 12 This is a diagram illustrating the enhanced PDSCH TCI state activation / deactivation MAC-CE structure according to an embodiment of the present disclosure;

[0036] Figure 13 This is a diagram illustrating a base station and a UE as examples of multiple TRP operations according to embodiments of the present disclosure, including a TRP that only supports uplink reception functionality;

[0037] Figure 14 This is a diagram illustrating a method for calculating and updating path loss offset according to an embodiment of the present disclosure;

[0038] Figure 15 This is a diagram illustrating another method for calculating and updating path loss offset according to an embodiment of the present disclosure;

[0039] Figure 16 This is a diagram illustrating the operation of a UE for uplink transmit power control according to an embodiment of the present disclosure;

[0040] Figure 17This is a diagram illustrating the operation of a base station for uplink transmit power control according to an embodiment of the present disclosure;

[0041] Figure 18 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown; and

[0042] Figure 19 The structure of a base station in a wireless communication system according to an embodiment of the present disclosure is shown.

[0043] Throughout the accompanying drawings, it should be noted that the same reference numerals are used to depict the same or similar elements, features, and structures. Detailed Implementation

[0044] The following description, provided with reference to the accompanying drawings, is intended to aid in a full understanding of the various embodiments of this disclosure as defined by the claims and their equivalents. It includes various specific details to aid understanding, but these are merely examples. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of this disclosure. Furthermore, for clarity and brevity, descriptions of well-known functions and constructions may be omitted.

[0045] The terms and words used in the following description and claims are not limited to their documentary meaning, but are used solely by the inventors to ensure a clear and consistent understanding of this disclosure. Therefore, those skilled in the art will understand that the following description, which provides various embodiments of this disclosure, is for illustrative purposes only and is not intended to limit the disclosure as defined by the appended claims and their equivalents.

[0046] It should be understood that, unless explicitly stated otherwise in the context, the singular forms of “a,” “an,” and “the” include plural referents. Thus, for example, a reference to “component surface” includes a reference to one or more such surfaces.

[0047] In the accompanying drawings, some elements may be exaggerated, omitted, or shown schematically. Furthermore, the size of each element does not perfectly reflect its actual size. Identical or corresponding elements in the drawings have the same reference numerals.

[0048] The advantages and features of this disclosure, as well as the ways in which they are implemented, will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings. However, this disclosure is not limited to the embodiments set forth below, but can be implemented in a variety of different forms. The following embodiments are provided only to fully disclose this disclosure and to inform those skilled in the art of its scope, and this disclosure is limited only by the scope of the appended claims. Throughout the specification, the same or similar reference numerals denote the same or similar elements. Furthermore, in describing this disclosure, detailed descriptions of known functions or configurations contained herein will be omitted where it is determined that such description might unnecessarily obscure the subject matter of the disclosure. The terminology described below is defined in consideration of the functions in this disclosure and may vary depending on the user, the user's intention, or custom. Therefore, the definition of the terminology should be made based on the entire contents of the specification.

[0049] In the following description, a base station is an entity that allocates resources to a terminal and can be at least one of a gNode B, eNode B, Node B, base station (BS), radio access unit, base station controller, and a node on a network. A terminal can include a user equipment (UE), mobile station (MS), cellular phone, smartphone, computer, or multimedia system capable of performing communication functions. In this disclosure, "downlink" refers to a radio link through which a base station transmits signals to a terminal, and "uplink" refers to a radio link through which a terminal transmits signals to a base station.

[0050] In the following description of embodiments of this disclosure, a 5G system will be described by way of example. However, embodiments of this disclosure can also be applied to other communication systems with similar technical backgrounds or channel types. Examples of such communication systems may include Long Term Evolution (LTE) or LTE-Advanced (LTE-A) mobile communication systems and mobile communication technologies developed after 5G. Furthermore, based on the determination of those skilled in the art, this disclosure can also be applied to other communication systems with some modifications without significantly departing from the scope of this disclosure. The content of this disclosure can be applied to Frequency Division Duplex (FDD) and Time Division Duplex (TDD) systems.

[0051] In this document, it should be understood that each block of a flowchart illustration and combinations of blocks in a flowchart illustration can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus used to produce machines, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create components for performing the functions specified in one or more flowchart blocks. These computer program instructions can also be stored in a computer-usable or computer-readable storage medium that can instruct the computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-usable or computer-readable storage medium produce an article of manufacture including instruction components that implement the functions specified in one or more flowchart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the functions specified in one or more flowchart blocks.

[0052] Furthermore, each block in the flowchart can represent a module, segment, or section of code, which includes one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions described in a block may not occur in this order. For example, depending on the functions involved, two blocks shown consecutively may actually be executed substantially simultaneously, or sometimes they may be executed in reverse order.

[0053] As used herein, "unit" refers to a software or hardware element that performs a predetermined function, such as a field-programmable gate array (FPGA) or application-specific integrated circuit (ASIC). However, "unit" does not always have a meaning limited to software or hardware. A "unit" can be configured to be stored in addressable storage media or to execute one or more processors. Therefore, "unit" includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and parameters. The elements and functions provided by a "unit" can be combined into a smaller number of elements or "units," or divided into a larger number of elements or "units." Furthermore, elements and "units" may be implemented as one or more central processing units (CPUs) within a playback device or secure multimedia card. Additionally, a "unit" in an embodiment may include one or more processors.

[0054] Wireless communication systems have evolved into broadband wireless communication systems, which, in addition to the voice-based services initially provided, offer high-speed and high-quality packet data services based on communication standards such as High Speed ​​Packet Access (HSPA) of the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE) or Evolved Universal Terrestrial Radio Access (E-UTRA), LTE-Advanced (LTE-A), LTE-Pro, High Speed ​​Packet Data (HRPD) of 3GPP2, Ultra Mobile Broadband (UMB), and IEEE 802.16e.

[0055] LTE systems, as a representative example of broadband wireless communication systems, employ Orthogonal Frequency Division Multiplexing (OFDM) for the downlink (DL) and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for the uplink (UL). The uplink is the radio link through which User Equipment (UE) (or Mobile Station (MS)) transmits data or control signals to the Base Station (BS) (or eNode B), and the downlink is the radio link through which the BS transmits data or control signals to the UE. In these multiple access schemes, the time-frequency resources used to carry data or control information are allocated and operated in a manner that prevents resource overlap, i.e., orthogonality is established between users to identify the data or control signals of each user.

[0056] Post-LTE communication systems, i.e., 5G communication systems, should be able to freely reflect the various requirements of users and service providers, and therefore need to support services that meet diverse requirements. Services considered for use in 5G communication systems include enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), and ultra-reliable low-latency communications (URLLC).

[0057] eMBB aims to provide improved data transmission rates exceeding those supported by conventional LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, from a base station's perspective, eMBB should provide a peak downlink data rate of 20 Gbps and a peak uplink data rate of 10 Gbps. Furthermore, 5G communication systems should not only provide peak data rates but also higher user-perceived data rates. To meet these requirements, various transmit / receive technologies need improvement, including further refined multiple-input multiple-output (MIMO) transmission techniques. Moreover, while current LTE systems use transmit bandwidths ranging from 2 GHz to a maximum of 20 MHz, 5G communication systems utilize wider frequency bandwidths than 20 MHz in the 3 to 6 GHz band or higher and equal to 6 GHz, thus meeting the data transmission rates required by 5G communication systems.

[0058] Furthermore, to support application services such as the Internet of Things (IoT), mMTC is considered in 5G communication systems. mMTC is needed to support the access of multiple UEs within a cell, improve UE coverage, extend battery life, and reduce UE costs in order to effectively deliver IoT. IoT is attached to various sensors and devices to provide communication, therefore it should support a large number of UEs within a cell (e.g., 1,000,000 UEs / km). 2 Since UEs supporting mMTC are highly likely to be located in shaded areas, such as basements of buildings, where cell coverage is limited due to service characteristics, mMTC may require wider coverage than other services offered by 5G communication systems. UEs supporting mMTC need to be manufactured at low cost and their batteries are difficult to replace frequently, thus potentially requiring very long battery life, such as 10 to 15 years.

[0059] Finally, URLLC is a cellular-based wireless communication service used for specific (mission-critical) purposes. For example, services for remotely controlling robots or machinery, industrial automation, drones, remote healthcare, and emergency alerts could be considered. Therefore, the communication provided by URLLC should offer very low latency and very high reliability. For example, services supporting URLLC should meet a radio access delay time (air interface delay) of less than 0.5 milliseconds and also require a packet error rate equal to or less than 10-1. -5 Therefore, for services that support URLLC, 5G systems should provide shorter transmission time intervals (TTIs) than other systems, and also have the design requirement to allocate a large amount of resources in the frequency band to ensure the reliability of the communication link.

[0060] 5G's three services—eMBB, URLLC, and mMTC—can be multiplexed and transmitted within a single system. In this case, to meet the different requirements of each service, different transmit / receive schemes and parameters can be used. Of course, 5G is not limited to these three services.

[0061] In the following description, the term "a / b" can be understood as at least one of a and b.

[0062] It should be understood that each flowchart and the blocks in a combination of flowcharts can be executed by one or more computer programs, including instructions. One or more computer programs can be stored entirely in a single memory device, or one or more computer programs can be divided into different parts stored in multiple different memory devices.

[0063] Any function or operation described herein can be processed by a processor or a combination of processors. A processor or a combination of processors is circuitry that performs processing, including, for example, an application processor (AP, such as a central processing unit (CPU)), a communication processor (CP, such as a modem), a graphics processing unit (GPU), a neural processing unit (NPU) (such as an artificial intelligence (AI) chip), a Wi-Fi chip, and Bluetooth. ® Circuits such as chips, Global Positioning System (GPS) chips, Near Field Communication (NFC) chips, connectivity chips, sensor controllers, touch controllers, fingerprint sensor controllers, display driver integrated circuits (ICs), audio CODEC chips, Universal Serial Bus (USB) controllers, camera controllers, image processing ICs, microprocessor units (MPUs), system-on-a-chip (SoCs), and ICs.

[0064] [NR Time-Frequency Resources]

[0065] The frame structure of the 5G system will be described in more detail below with reference to the accompanying drawings.

[0066] Figure 1 The basic structure of the time-frequency domain according to an embodiment of the present disclosure is shown. This time-frequency domain is a radio resource domain for transmitting data or control channels in a 5G system.

[0067] Reference Figure 1 The horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in both the time and frequency domains is a resource element (RE) 101, which can be defined as one orthogonal frequency division multiplexing (OFDM) symbol 102 on the time axis and one subcarrier 103 on the frequency axis. In the frequency domain, One (e.g., 12) consecutive REs can correspond to a resource block (RB) 104. In the time domain, a subframe 110 can include multiple OFDM symbols 102. For example, the length of a subframe can be 1 ms.

[0068] Figure 2 The frame, subframe, and time slot structure in a wireless communication system according to an embodiment of the present disclosure is shown.

[0069] Reference Figure 2 An example of the structure of frame 200, subframe 201, and time slot 202 is shown. One frame 200 can be defined as 10 ms. One subframe 201 can be defined as 1 ms, so one frame 200 can include a total of 10 subframes 201. One time slot 202 or 203 can be defined as 14 OFDM symbols per time slot (i.e., the number of symbols per time slot). (=14). A subframe 201 may include one or more time slots 202 and 203, and the number of time slots 202 or 203 in each subframe 201 may vary depending on the configuration value μ204 or 205 of the subcarrier spacing. Figure 2 The example shows the cases where the subcarrier spacing configuration value μ = 0 204 and the subcarrier spacing setting value μ = 1 205. When μ = 0 204, one subframe 201 can include one time slot 202; when μ = 1 205, one subframe 202 can include two time slots 203. That is, the number of time slots in each subframe ( The number of time slots per frame can vary depending on the configured subcarrier spacing (μ). The configuration value (μ) can also be changed accordingly. ) and quantity ( () can be defined as shown in Table 1 below.

[0070] Table 1

[0071]

[0072] [Bandwidth Component (BWP)]

[0073] The configuration of the bandwidth portion (BWP) in a 5G system is then described in detail with reference to the accompanying drawings.

[0074] Figure 3 An example of the configuration of a BWP in a wireless communication system according to an embodiment of this disclosure is shown.

[0075] Reference Figure 3 The UE bandwidth 300 is configured as two bandwidth portions, namely BWP#1 301 and BWP#2 302. The BS can configure one or more BWPs in the UE, and can configure the following information in Table 2 for each BWP.

[0076] Table 2

[0077]

[0078] Of course, this disclosure is not limited to this example; various parameters and configuration information related to the BWP can be configured in the UE. The BS can send information to the UE via higher-layer signaling (e.g., Radio Resource Control (RRC) signaling). Among one or more configured BWPs, at least one BSP can be activated. Information indicating whether a configured BWP is activated can be semi-statically transmitted from the BS to the UE via RRC signaling, or dynamically transmitted via downlink control information (DCI).

[0079] According to embodiments of this disclosure, the UE can receive the initial BWP configuration for initial access from the BS via the Master Information Block (MIB) before establishing a Radio Resource Control (RRC) connection. More specifically, the UE can receive configuration information for a control resource set (CORESET) and a search space, in which a Physical Downlink Control Channel (PDCCH) can be transmitted during the initial access step for receiving system information (Remaining System Information (RMSI) or System Information Block 1 (SIB1)) required for initial access via the MIB. The control resource set and search space configured as the MIB can be considered as ID 0. The BS can notify the UE of configuration information via the MIB, such as frequency allocation information, time allocation information, parameter sets, etc., for control resource set #0. Furthermore, the BS can notify the UE of the configuration information for the monitoring period and timing of control resource set #0, i.e., the configuration information for search space #0, via the MIB. The UE can consider the frequency region configured as control resource set #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the ID of the initial BWP can be considered as 0.

[0080] The BWP configuration supported by the 5G system can be used for a variety of purposes.

[0081] According to embodiments of this disclosure, when the bandwidth supported by the UE is narrower than the system bandwidth, this can be achieved through BWP configuration. For example, the BS can configure the frequency position of the BWP in the UE (configuration information 2), so that the UE can send and receive data at a specific frequency position within the system bandwidth.

[0082] Furthermore, according to embodiments of this disclosure, to support different parameter sets, the BS can configure multiple BWPs in the UE. For example, to support the UE using both 15kHz and 30kHz subcarrier spacings for data transmission and reception, two BWPs can be configured with subcarrier spacings of 15kHz and 30kHz, respectively. Different BWPs can be frequency-division multiplexed, and when data needs to be transmitted and received with a specific subcarrier spacing, the BWP configured with the corresponding subcarrier spacing can be activated.

[0083] According to embodiments of this disclosure, to reduce the power consumption of the UE, the BS can configure BWPs with different bandwidth sizes in the UE. For example, when the UE supports a very large bandwidth (e.g., 100MHz) but always transmits and receives data through that bandwidth, very high power consumption may occur. In particular, from a power consumption perspective, monitoring unnecessary downlink control channels through a large bandwidth of 100MHz in the absence of service is very inefficient. To reduce the power consumption of the UE, the BS can configure BWPs with relatively narrow bandwidths, such as 200MHz. The UE can perform monitoring operations in the 200MHz bandwidth portion in the absence of service, and if data is generated, it can transmit and receive data through the 100MHz bandwidth portion according to instructions from the BS.

[0084] In the method for configuring the BWP, during the initial access step, the UE, prior to RRC connection, can receive configuration information for the initial bandwidth portion via the Master Information Block (MIB). More specifically, the UE can receive the configuration of the Control Resource Set (CORESET) for the downlink control channel, which allows the transmission of downlink control information (DCI) for the Scheduled System Information Block (SIB) from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the Control Resource Set configured as the MIB can be considered as the initial bandwidth portion, through which the UE can receive the Physical Downlink Shared Channel (PDSCH) and transmit the SIB within the PDSCH. The initial BWP can be used not only for receiving SIBs but also for other System Information (OSI), paging, or random access.

[0085] [BWP Change]

[0086] When one or more BWPs are configured in the UE, the BS can indicate changes (or switching or conversions) to the UE via the BWP indicator field within the DCI. For example, in Figure 3 In the process, when the UE's currently active BWP is BWP#1 301, the BS can indicate BWP#2 302 to the UE through the BWP indicator in the DCI, and the UE can change the BWP to BWP#2 302 indicated by the BWP indicator received in the DCI.

[0087] As described above, since the DCI used for scheduling PDSCH or PUSCH can indicate DCI-based BWP changes, if the UE receives a BWP change request, the UE should be able to receive or transmit the PDSCH or PUSCH scheduled by the corresponding DCI without difficulty in the changed BWP. To this end, the standard defines the delay time (T) required for BWP changes. BWP Requirements, for example, can be defined as follows.

[0088] Table 3

[0089]

[0090] Depending on the UE's capabilities, the requirement to change the delay time of the BWP can support either Type 1 or Type 2. The UE can report the supported BWP delay time types to the BS.

[0091] When the UE receives the DCI including the BWP change indicator in time slot n according to the BWP change delay time requirement, the UE can proceed no later than time slot n+T. BWP The BS completes the change of the BWP indicated by the BWP change at the specified time point, and transmits and receives data channels scheduled by the corresponding DCI in the changed new BWP. When the BS wants to schedule data channels in the new BWP, the BS can take into account the UE's BWP change delay time (T). BWP The time-domain resource allocation of the data channel is determined by the method of determining the time-domain resource allocation of the data channel in the new BWP. That is, when scheduling a data channel in the new BWP, the BS can use this method to schedule the corresponding data channel after the BWP change delay time. Therefore, the UE may not expect the DCI indication indicating the BWP change to be less than the BWP change delay time (T). BWP The time slot offset (K0 or K2).

[0092] If the UE receives a DCI indicating a BWP change (e.g., DCI format 1_1 or 0_1), the UE may refrain from transmitting or receiving for the time interval from the third symbol of the slot used to receive the PDCCH including the corresponding DCI to the start point of the slot indicated by the slot offset (K0 or K2) indicated by the time domain resource allocation field within the corresponding DCI. For example, when the UE receives a DCI indicating a BWP change in slot n and the slot offset value indicated by the corresponding DCI is K, the UE may refrain from transmitting or receiving from the third symbol of slot n to the symbols preceding slot n+K (i.e., the last symbol of slot n+K-1).

[0093] [About CA / DC]

[0094] Figure 4 Radio protocol structures for the BS and UE in single cell, carrier aggregation (CA), and dual connectivity (DC) according to embodiments of this disclosure are shown.

[0095] Reference Figure 4The wireless protocols of the wireless communication system (e.g., 5G or NR system) according to embodiments of this disclosure include NR Service Data Adaptation Protocol (SDAP) S25 or S70, NR Packet Data Convergence Protocol (PDCP) S30 or S65, NR Radio Link Control (RLC) S35 or S60 and NR Media Access Control (MAC) S40 or S55 in each of the UE and NR gNB.

[0096] The main functions of NR SDAP S25 or S70 may include some of the following functions.

[0097] - User data transmission function (user plane data transmission)

[0098] - Functionality for mapping uplink and downlink Quality of Service (QoS) flows and data bearers (for mapping between QoS flows and data radio bearers (DRB) for both DL and UL)

[0099] - The ability to tag uplink and downlink QoS flow IDs (tag QoS flow IDs in both DL and UL packets).

[0100] - The function of mapping reflected QoS flows to uplink SDAP Packet Data Units (PDUs) data bearers (mapping of reflected QoS flows to DRBs for UL SDAP PDUs).

[0101] Regarding SDAP layer devices, the UE can receive configuration information via RRC messages regarding whether to use the SDAP layer device header or the functionality of the SDAP layer device for each PDCP layer device, each bearer, or each logical channel. If the SDAP header is configured, the 1-bit indicator for Non-Access Stratum (NAS) reflected QoS and the 1-bit indicator for AS reflected QoS in the SDAP header can instruct the UE to update or reconfigure information regarding the mapping of QoS flows and data bearers in the uplink and downlink. The SDAP header may include QoS flow ID information indicating QoS. QoS information can be used as data processing priority or scheduling information to support seamless service.

[0102] The main functions of NR PDCP S30 or S65 may include some of the following functions.

[0103] - Header compression and decompression functions (Header compression and decompression: Robust Header Compression (ROHC) only)

[0104] - User data sending function (user data transmission)

[0105] - Sequential delivery function (sequential delivery of upper-layer PDUs)

[0106] - Non-sequential delivery function (out-of-order delivery of upper-layer PDUs)

[0107] - Reordering function (PDCP PDU receive reordering)

[0108] - Duplicate detection function (duplicate detection of lower-level service data units (SDUs))

[0109] - Retransmission function (PDCP SDU retransmission)

[0110] - Encryption and decryption functions (encryption and decryption)

[0111] - Timer-based SDU removal function (timer-based MDU discarding in uplink)

[0112] The reordering function of NR PDCP layer devices is a function that reorders PDC PDUs received from lower layers based on the PDCP sequence number (SN), and may include the function of transmitting the reordered data to higher layers in order. The reordering function of NR PDCP layer devices may include the function of directly sending data regardless of the order, the function of recording PDCP PDUs lost due to reordering, the function of reporting the status of lost PDCP PDUs to the transmitting side, and the function of requesting retransmission of lost PDCP PDUs.

[0113] The main functions of NR RLC S35 or S60 may include some of the following functions.

[0114] - Data transmission function (transmission of upper-layer PDUs)

[0115] - Sequential delivery function (sequential delivery of upper-layer PDUs)

[0116] - Non-sequential delivery function (out-of-order delivery of upper-layer PDUs)

[0117] - Automatic Repeat Request (ARQ) function (error correction via ARQ)

[0118] - Cascading, segmentation, and reassembly functions (cascading, segmentation, and reassembly of RLC SDU)

[0119] - Re-segmentation function (re-segmentation of RLC data PDUs)

[0120] - Reordering function (reordering RLC data PDUs)

[0121] - Duplicate detection function (duplicate detection)

[0122] - Error detection function (protocol error detection)

[0123] -RLC SDU deletion function (RLC SDU discard)

[0124] -RLC Reconstruction Function (RLC Reconstruction)

[0125] The sequential delivery function (in-order delivery) of NR RLC layer devices is the function of sequentially transmitting RLC SDUs received from lower layers to higher layers. When an original RLC SDU is divided into multiple RLC SDUs and subsequently received, the sequential delivery function (in-order delivery) of NR RLC layer devices can include functions for reassembling and transmitting RLC SDUs, reordering received RLC PDUs based on the RLC sequence number (SN) or PDCP SN, recording RLC PDUs lost due to reordering, reporting the status of lost RLC PDUs to the transmitting side, and requesting retransmission of lost RLCPDUs. When lost RLC SDUs exist, the sequential delivery function (in-order delivery) of NR RLC layer devices can include functions for sequentially transmitting only RLC SDUs preceding the lost RLC SDU to higher layers, or, if a predetermined timer expires even though lost RLC SDUs exist, sequentially transmitting all RLC SDUs received before the timer starts to higher layers. Alternatively, the sequential delivery function of the NR RLC layer device may include the following functionality: if a predetermined timer expires even if a lost RLC SDU exists, all RLC SDUs received to date are sequentially transmitted to a higher layer. Furthermore, the NR RLC device may process RLC PDUs sequentially according to their reception order (based on arrival order, regardless of sequence number or order number) and may transmit RLC PDUs to the PDCP device regardless of their order (out-of-order delivery). In the case of segmentation, the NR RLC device may receive segments stored in a buffer or to be received in the future, reconfigure these segments into an RLC PDU, process that RLC PDU, and then send it to the PDCP device. The NR RLC layer device may not include cascading functionality, and this functionality may be performed by the NR MAC layer or replaced by multiplexing functionality of the NR MAC layer.

[0126] The out-of-order function (out-of-order delivery) of NR RLC layer devices is the function of directly transmitting RLC SDUs received from lower layers to higher layers, regardless of the order of the RLC SDUs. It may include functions for reassembling and transmitting RLC PDUs when an original RLC SDU is divided into multiple RLC SDUs and then received, as well as functions for storing the RLC SN or PDCP SN of the received RLC PDUs, reordering RLC PDUs, and recording lost RLC PDUs.

[0127] The NR MAC S40 or S55 can connect to multiple NR RLC layer devices configured in a single UE, and the main functions of the NR MAC can include some of the following functions.

[0128] - Mapping function (mapping between logical channels and transport channels)

[0129] - Multiplexing and demultiplexing functions (MAC SDU multiplexing / demultiplexing)

[0130] - Scheduling information reporting function (Scheduling Information Report)

[0131] - Hybrid ARQ (HARQ) functionality (error correction via HARQ)

[0132] - Logical channel priority control function (priority handling between logical channels of a UE)

[0133] -UE priority control function (performs priority processing among UEs through dynamic scheduling)

[0134] - Multimedia Broadcast Multicast Service (MBMS) Service Identification Function (MBMS Service Identification)

[0135] -Transmission format selection function (Transmission format selection)

[0136] - Fill function (Fill)

[0137] The NR physical (PHY) layer S45 or S50 performs operations for channel coding and modulation of higher-layer data to generate OFDM symbols and transmit OFDM symbols via radio channels, or demodulates and decodes OFDM symbols received via radio point channels and transmits the demodulated and channel-decoded OFDM symbols to higher layers.

[0138] The detailed structure of the wireless protocol architecture can vary depending on the carrier (or cell) operation scheme. For example, when the BS transmits data to the UE based on a single carrier (or cell), the BS and UE use a protocol architecture where each layer has a single structure, as shown by reference numeral S00. On the other hand, when the BS uses multiple carriers in a single TRP to transmit data to the UE based on carrier aggregation (CA), the BS and UE use a protocol architecture where the layers up to the RLC have a single structure, but the PHY layer is multiplexed through the MAC layer, as shown by reference numeral S10. In another example, when the BS uses multiple carriers in multiple TRPs to transmit data to the UE based on dual connectivity (DC), the BS and UE use a protocol architecture where the layers up to the RLC have a single structure, but the PHY layer is multiplexed through the MAC layer, as shown by reference numeral S20.

[0139] [Unified TCI Status]

[0140] The following describes a single TCI state indication and activation method based on a unified TCI approach. A unified TCI approach can refer to a method that manages transmit / receive beam management by unifying the TCI state method used in the downlink reception of the UE and the spatial relationship information method used in the uplink transmission of the existing Rel-15 and 16 UEs into TCI states. Therefore, when the base station indicates the UE based on a unified TCI method, the UE can also perform beam management by using the TCI state for uplink transmission. If the UE has configured a TCI state (i.e., upper-layer signaling) and TCI-stateId-r17 (i.e., upper-layer signaling) from the base station, the UE can perform operations based on the unified TCI method using the corresponding TCI state. TCI states may exist in two forms: a combined TCI state or a separate TCI state.

[0141] The first form is a combined TCI state, where the UE can indicate the application of a TCI state from the base station to both uplink transmission and downlink reception. If the UE is indicated using a TCI state based on a combined TCI state, the parameters used by the UE for downlink channel estimation can be indicated using the reference signal (RS) corresponding to qcl-Type1 in the TCI state, and the parameters used by the UE for the downlink receive beam or receive filter can be indicated using the RS corresponding to qcl-Type2. If the UE is indicated using a TCI state based on a combined TCI state, the UE can indicate the parameters used for the uplink transmit beam or transmit filter based on the combined DL / UL TCI state, using the RS corresponding to qcl-Type2 in the TCI state. In this case, if the UE is indicated using a combined TCI state, the UE can apply the same beam to both uplink transmission and downlink reception.

[0142] The second form is a separate TCI state, which the UE can indicate separately using the UL TCI state applied to uplink transmission and the DL TCI state applied to downlink reception from the base station. If the UE indicates using the UL TCI state, it can use parameters that will be used as the uplink transmission beam or transmit filter, employing the reference RS or source RS configured in the corresponding ULTCI state. If the UE indicates using the UL TCI state, it can be indicated to use parameters for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the corresponding DL TCI state, and to use the RS corresponding to qcl-Type2 as the downlink receive beam or receive filter.

[0143] If the UE is indicated by both DL TCI state and UL TCI state, the UE can be instructed to use the reference RS or source RS configured in the corresponding UL TCI state as parameters for the uplink transmit beam or transmit filter, and can be instructed to use parameters for downlink channel estimation using the RS corresponding to qcl-Type1 configured in the corresponding DL TCI state, and parameters for downlink receive beam or receive filter using the RS corresponding to qcl-Type 2. In this case, if the reference RS or source RS configured in the DL TCI state indicating the UE and the UL TCI state indicating the UE are different, the UE can apply the beam to uplink transmit and downlink receive based on the indicated UL TCI state and DL TCI state, respectively.

[0144] The UE can configure up to 128 joint TCI states for each bandwidth segment within a specific cell via upper-layer signaling from the base station, and can configure up to 64 or 128 DL TCI states in individual TCI states based on upper-layer signaling for each bandwidth segment within a specific cell via UE capability reports. The DL TCI states in both individual TCI states and joint TCI states can use the same upper-layer signaling structure. For example, if 128 joint TCI states are configured and 64 DL TCI states in individual TCI states are also configured, these 64 DL TCI states can be included in the 128 joint TCI states.

[0145] Based on the UE capability report, by using upper-layer signaling for each specific bandwidth portion in a specific cell, the UL TCI states in a single TCI state can be configured to a maximum of 32 or 64. The UL TCI states and joint TCI states in a single TCI state can also use the same upper-layer signaling structure as the relationship between the DL TCI states and joint TCI states in a single TCI state. Furthermore, the UL TCI states in a single TCI state can use upper-layer signaling structures different from the joint TCI states and DL TCI states in a single TCI state.

[0146] The use of different or the same upper-layer signaling structures can be defined in the specification, or can be distinguished by another upper-layer signaling configured by the base station based on the UE capability report, which includes information about whether the UE can support one of the two usage modes.

[0147] The UE can receive indications related to transmit and receive beams using a unified TCI method by using either a joint TCI state or a separate TCI state configured by the base station. Whether the UE uses either a joint TCI state or a separate TCI state can be configured by the base station via upper-layer signaling.

[0148] The UE can receive transmit / receive beam-related indications via upper-layer signaling using one of the methods selected from the joint TCI state and the individual TCI state. In this case, there may be two methods for transmit / receive beam indications from the base station: a MAC CE-based indication method and a MAC CE-based DCI-activated indication method.

[0149] If the UE receives an indication related to the transmit / receive beam using the joint TCI state method via upper-layer signaling, the UE can perform transmit / receive beam application operations by receiving the MAC-CE indicating the joint TCI state from the base station, and the base station can schedule the reception of the PDSCH including the MAC-CE to the UE via the PDCCH. If the MAC-CE includes a joint TCI state, the UE can, starting 3ms after the Physical Uplink Control Channel (PUCCH) including HARQ acknowledgment (ACK) information is transmitted, use the indicated joint TCI state to determine the uplink transmit beam or transmit filter and the downlink receive beam or receive filter using the indicated joint TCI state. The HARQ acknowledgment information indicates whether the PDSCH including the MAC-CE was successfully or unsuccessfully received. If the MAC-CE includes two or more joint TCI states, the UE can identify that the multiple joint TCI states indicated by the MAC-CE correspond to each code point in the TCI state field of DCI format 1_1 or 1_2, and activate the indicated joint TCI state starting 3ms after the PUCCH including HARQ-ACK information is transmitted. The HARQ-ACK information indicates whether the PDSCH including the MAC-CE was successfully or unsuccessfully received. Afterwards, the UE can receive DCI format 1_1 or 1_2 and apply one joint TCI state indicated by the TCI state field in the corresponding DCI to the uplink transmit and downlink receive beams. In this case, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL allocation), or it may not include it (without DL allocation).

[0150] If the UE receives an indication related to the transmit / receive beam using a separate TCI state method via upper-layer signaling, the UE can perform transmit / receive beam application operations by receiving a MAC-CE indicating the separate TCI state from the base station, and the base station can schedule the reception of the PDSCH including the MAC-CE to the UE via the PDCCH. If the MAC-CE includes a separate TCI state set, the UE can determine the uplink transmit beam or transmit filter and the downlink receive beam or receive filter by using the separate TCI states in the indicated separate TCI state set, starting 3ms after the PUCCH including HARQ-ACK information is transmitted. The HARQ-ACK indicates whether the reception of the PDSCH including the MAC-CE was successful or failed. In this case, a separate TCI state set may mean that a code point in the TCI state field of DCI format 1_1 or 1_2 may have one or more separate TCI states, and a separate TCI state set may include a DL TCI state, a ULTCI state, or a DL TCI state and a ULTCI state. If the MAC-CE includes two or more separate TCI state sets, the UE can identify that the multiple separate TCI state sets indicated by the MAC-CE correspond to each code point of the TCI state field in DCI format 1_1 or 1_2, and activate the indicated separate TCI state set starting 3ms after the PUCCH transmission including HARQ-ACK information, which indicates the success or failure of PDSCH reception including the MAC-CE. In this case, each code point of the TCI state field in DCI format 1_1 or 1_2 can indicate a DL TCI state, a UL TCI state, or a DL TCI state and a UL TCI state, respectively. The UE can receive DCI format 1_1 or 1_2 and apply the separate TCI state sets indicated by the TCI state fields in the corresponding DCI to the uplink transmit and downlink receive beams. In this case, DCI format 1_1 or 1_2 may include downlink data channel scheduling information (with DL allocation) or may not include it (without DL allocation).

[0151] Figure 5 This is a graph illustrating the beam application time that can be considered when using the unified TCI method in a wireless communication system according to an embodiment of the present disclosure.

[0152] As described above, the UE can receive DCI format 1_1 or 1_2 from the base station, including (with DL allocation) or excluding (without DL allocation) downlink data channel scheduling information, and apply a joint TCI state or a separate TCI state set indicated by the TCI state field in the corresponding DCI to the uplink transmit and downlink receive beams. (Refer to...) Figure 5 ,

[0153] - DCI format 1_1 or 1_2 with DL allocation 5-00: If the UE receives DCI format 1_1 or 1_2 from the base station, which includes downlink data channel scheduling information, and indicates a joint TCI state or a separate TCI state set based on the unified TCI method (5-01), then the UE can receive PDSCH based on the received DCI scheduling (5-05) and can send a PUCCH including HARQ-ACK, indicating whether the reception of DCI and PDSCH was successful (5-10). In this case, HARQ-ACK can include the meaning of whether the reception of DCI and PDSCH was successful, and if at least one of DCI and PDSCH is not received, the UE can send a negative acknowledgment (NACK); if both are successfully received, the UE can send an ACK.

[0154] - DCI format 1_1 or 1_2 without DL allocation 5-50: If the UE receives DCI format 1_1 or 1_2 from the base station that does not include downlink data channel scheduling information, and indicates a joint TCI state or a separate TCI state set based on a unified TCI method (5-55), then the UE may assume at least one combination of the following for the corresponding DCI.

[0155] ■ Includes CRC scrambling using CS-RNTI.

[0156] ■ All bits assigned to all fields used as redundant version (RV) fields are 1.

[0157] ■ All bits assigned to all fields used as modulation and coding scheme (MCS) fields are 1.

[0158] ■ All bits assigned to all fields used as New Data Indicator (NDI) fields are 0.

[0159] ■ In the case of Frequency Domain Resource Allocation (FDRA) type 0, all bits allocated to the FDRA field are 0; in the case of FDRA type 1, they are 1; and in the case of dynamically switching FDRA methods, all bits allocated to the FDRA field are 0.

[0160] The UE may send a PUCCH including a HARQ-ACK, which indicates whether the reception of DCI format 1_1 or 1_2, which assumes the above-mentioned matters, was successful (5-60).

[0161] - For DCI formats 1_1 or 1_2 with DL allocation 5-00 and without DL allocation 5-50, if the new TCI state indicated by DCI 5-01 and 5-55 is the same as the TCI state already indicated and applied to the uplink transmit and downlink receive beams, the UE can maintain the previously applied TCI state. If the new TCI state is different from the previously indicated TCI state, the UE can determine the application time of the joint TCI state or the individual TCI state set as the time after the first time slot 5-20 and 5-70 after the equivalent time of beam application time (BAT) 5-15 and 5-65 after PUCCH transmission 5-30 and 5-80. The joint TCI state or the individual TCI state set can be indicated from the TCI field included in the DCI, and the previously indicated TCI state can be used until the time slots 5-20 and 5-70 corresponding to (5-25, 5-75) are available.

[0162] - For both DCI formats 1_1 and 1_2 with DL allocation 5-00 and without DL allocation 5-50, BAT 5-15 and 5-65 can be configured as a specific number of OFDM symbols via upper-layer signaling based on UE capability report information, and the parameter set of BAT and the first time slot after BAT can be determined based on the minimum parameter set among all cells with joint TCI state applied or a separate TCI state set indicated by DCI.

[0163] The UE can apply a joint TCI state indicated by MAC-CE or DCI to the reception of control resource sets connected to all UE-specific search spaces, the reception of PDSCH and the transmission of PUSCH scheduled by PDCCH sent from the corresponding control resource set, and the transmission of all PUCCH resources.

[0164] When a single TCI state set indicated by MAC-CE or DCI includes a DL TCI state, the UE may apply a single TCI state set to the reception of control resource sets connected to all UE-specific search spaces, to the reception of PDSCH scheduled by PDCCH sent from the corresponding control resource set, and may apply a single TCI state set to all PUSCH and PUCCH resources based on the previously indicated UL TCI state.

[0165] When a single TCI state set indicated by MAC-CE or DCI includes a UL TCI state, the UE can apply a single TCI state set to all PUSCH and PUCCH resources, and apply a single TCI state set to the reception of control resource sets connected to all UE-specific search spaces based on the previously indicated DL TCI state and the reception of PDSCH scheduled by PDCCH sent from the corresponding control resource set.

[0166] When a single TCI state set indicated by MAC-CE or DCI includes a DL TCI state and a ULTCI state, the UE can apply the DL TCI state to the reception of control resource sets connected to all UE-specific search spaces, the reception of PDSCH scheduled on PDCCHs sent from the corresponding control resource sets, and the ULTCI state to all PUSCH and PUCCH resources.

[0167] [Unified TCI Status MAC-CE]

[0168] The following describes a single TCI state indication and activation method based on the unified TCI approach. The UE can interpret each code point in the TCI state field of DCI format 1_1 or 1_2 based on information in the MAC-CE received from the base station after three time slots, where the PDSCH is scheduled, including the following MAC-CE from the base station, and the HARQ-ACK of the corresponding PDSCH is sent to the base station. That is, the UE can activate each code point in the TCI state field of DCI format 1_1 or 1_2 for each entry of the MAC-CE received from the base station.

[0169] Figure 6 This is a diagram illustrating another MAC-CE structure for activating and indicating a combined TCI state, a separate DL, or a UL TCI state in a wireless communication system, according to an embodiment of this disclosure.

[0170] Reference Figure 6 The meaning of each field in the corresponding MAC-CE structure can be as follows.

[0171] - Serving Cell ID 6-00: This field indicates which serving cell the MAC-CE is applied to. The field can be 5 bits long. If the serving cell indicated by this field is included in one or more of the simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4, which are upper-layer signaling lists, then the corresponding MAC-CE can be applied to all serving cells in one or more of the lists simultaneousU-TCI-UpdateList1, simultaneousU-TCI-UpdateList2, simultaneousU-TCI-UpdateList3, or simultaneousU-TCI-UpdateList4 that include the serving cell indicated by this field.

[0172] -DL BWP ID 6-05: This field indicates which DL BWP the corresponding MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point in the bandwidth section indicator in the DCI. The length of this field can be 2 bits.

[0173] -UL BWP ID 6-10: This field indicates which UL BWP the corresponding MAC-CE applies to, and the meaning of each code point in this field can correspond to each code point of the bandwidth section indicator in the DCI. The length of this field can be 2 bits.

[0174] - P i 6-15: This field can indicate whether each code point in the TCI status field of DCI format 1_1 or 1_2 has multiple TCI statuses or a single TCI status. If P i If the value of P is 1, it indicates that the corresponding i-th code point has multiple TCI states, which may mean that the corresponding code point can include a separate DL TCI state and a separate UL TCI state. i If the value of is 0, it means that the corresponding i-th code point has a single TCI state, which may mean that the corresponding code point may include one of the joint TCI state, a separate DCI TCI state, or a separate UL TCI state.

[0175] -D / U 6-20: This field indicates whether the TCI status ID field in the same octet is a combined TCI status, a separate DL TCI status, or a separate UL TCI status. If this field is 1, the TCI status ID field in the same octet can be a combined TCI status or a separate DL TCI status, and if this field is 0, the TCI status ID field in the same octet can be a separate UL TCI status.

[0176] -TCI State ID 6-25: This field indicates the TCI state that can be determined by the upper-layer signaling TCI-StateId. If the D / U field is configured to 1, this field can be used to represent the TCI-StateId, which can be represented by 7 bits. If the D / U field is configured to 0, the most significant bit (MSB) of this field can be considered a reserved bit, and the remaining 6 bits can be used to represent the upper-layer signaling UL-TCIState-Id. For combined TCI states, the maximum number of TCI states that can be activated is 8, and for individual DL or UL TCI states, it can be 16.

[0177] -R 6-30: Indicates a reserved bit and can be configured to 0.

[0178] Regarding the above Figure 6 Regardless of whether the unifiedTCI-StateType-r17 in MIMOparam-r17 of ServingCellConfig, which serves as upper-layer signaling, is configured as united or standalone, the UE can include a third octet in the corresponding MAC-CE structure. This third octet includes... Figure 6 The P1, P2...P8 fields in the MAC-CE structure. In this case, the UE can perform TCI state activation by using a fixed MAC-CE structure, regardless of the upper-layer signaling configured by the base station.

[0179] As another example, for the above Figure 6 In the MAC-CE structure, if the unifiedTCI-StateType-r17 in MIMOparam-r17 of ServingCellConfig, which serves as upper-layer signaling, is configured as united, the UE can omit the inclusion of... Figure 6 The third octet of the P1, P2...P8 fields. In this case, the UE can save up to 8 bits of payload in the corresponding MAC-CE according to the upper-layer signaling configured by the base station. Furthermore, Figure 6 All D / U fields from the fourth octet to the first bit can be considered as R fields, and all corresponding R fields can be configured to 0 bits.

[0180] [PCHC: Regarding DCI]

[0181] Then, the downlink control information (DCI) in the 5G system is described in detail.

[0182] In 5G systems, scheduling information for uplink data (or physical uplink data channel (PUSCH)) or downlink data (or physical downlink data channel (PDSCH)) is sent from the BS to the UE via DCI. The UE can monitor the backoff DCI format and the non-backoff DCI format of the PUSCH or PDSCH. The backoff DCI format may include predefined fixed fields between the BS and the UE, while the non-backoff DCI format may include configurable fields.

[0183] DCI messages can be transmitted via the Physical Downlink Control Channel (PDCCH) through channel coding and modulation processes. Cyclic Redundancy Check (CRC) can be added to the DCI message payload and can be scrambled by a Radio Network Temporary Identifier (RNTI) corresponding to the UE's identifier. Different RNTIs can be used depending on the purpose of the DCI message, such as UE-specific data transmission, power control commands, random access responses, etc. That is, the RNTI is not explicitly transmitted but is included in the CRC calculation process before transmission. If a DCI message transmitted via the PDCCH is received, the UE can identify the CRC using the assigned RNTI and, if the CRC is determined to be correct based on the CRC identification result, can recognize that the corresponding message has been sent to the UE.

[0184] For example, the DCI used to schedule PDSCH for System Information (SI) can be scrambled using SI-RNTI. The DCI used to schedule PDSCH for Random Access Response (RAR) messages can be scrambled using RA-RNTI. The DCI used to schedule PDSCH for paging messages can be scrambled using P-RNTI. The DCI used to notify Slot Format Indicator (SFI) can be scrambled using SFI-RNTI. The DCI used to notify Transmit Power Control (TPC) can be scrambled using TPC-RNTI. The DCI used to schedule UE-specific PDSCH or PUSCH can be scrambled using Cell RNTI (C-RNTI).

[0185] DCI format 0_0 can be used for backoff DCI for scheduling PUSCH, in which case CRC can be scrambled via C-RNTI. The DCI format 0_0 with CRC scrambling via C-RNTI can include, for example, the information shown in Table 4.

[0186] Table 4

[0187]

[0188] DCI format 0_1 ​​can be used for non-back-off DCI for scheduling PUSCH, in which case CRC can be scrambled via C-RNTI. The DCI format 0_1 ​​with CRC scrambling via C-RNTI can include, for example, the following information from Table 5.

[0189] Table 5

[0190]

[0191]

[0192] DCI format 1_0 can be used for backoff DCI for scheduling PDSCH, in which case CRC can be scrambled via C-RNTI. The DCI format 1_0 with CRC scrambling via C-RNTI can include, for example, the information in Table 6.

[0193] Table 6

[0194]

[0195] DCI format 1_1 can be used for non-back-off DCI for scheduling PDSCH, in which case CRC can be scrambled via C-RNTI. DCI format 1_1 with CRC scrambling via C-RNTI may include, for example, the following information as shown in Table 7.

[0196] Table 7

[0197]

[0198] [PDCCH: CORESET, REG, CCE, Search Space]

[0199] The downlink control channel in a 5G communication system is then described in more detail with reference to the accompanying drawings.

[0200] Figure 7 An example is shown of a control resource set (CORESET) in a 5G wireless communication system in which a downlink control channel is transmitted, according to an embodiment of the present disclosure.

[0201] Figure 7An example is shown in which a UE bandwidth portion 710 is configured on the frequency axis and two control resource sets (control resource set #1 701 and control resource set #2 702) are configured within one timeslot 720 on the time axis. Control resource sets 701 and 702 can be configured within a specific frequency resource 703 within the total UE BWP 710 on the frequency axis. A control resource set can be configured as one or more OFDM symbols on the time axis, and can be defined as a control resource set duration 704. Reference Figure 7 In the example shown, control resource set #1 701 can be configured for a control resource set duration of 2 symbols, and control resource set #2 702 can be configured for a control resource set duration of 1 symbol.

[0202] In a 5G system, the control resource set can be configured by the BS via higher-level signaling in the UE (e.g., system information, master information block (MIB), or radio resource control (RRC) signaling). Configuring the control resource set in the UE may mean providing information such as the control resource set identifier, the frequency location of the control resource set, and the control resource set symbol length. For example, the following information from Table 8 may be included.

[0203] Table 8

[0204]

[0205] In Table 8, the tci-StatesPDCCH (referred to as Transmit Configuration Indicator (TCI) state) configuration information may include information about one or more Synchronization Signal (SS) / Physical Broadcast Channel (PBCH) block indices or Channel State Information Reference Signal (CSI-RS) indices, which have a quasi-co-position (QCL) relationship with the DMRS transmitted in the corresponding CORESET.

[0206] Figure 8 An example of a basic unit of time and frequency resources included in a downlink control channel for use in an 8G system according to an embodiment of the present disclosure is shown.

[0207] Reference Figure 8 The basic unit of time and frequency resources included in the control channel can be a resource element group (REG) 803, and REG 803 can be defined as one OFDM symbol 801 on the time axis and one physical resource block (PRB) 802 on the frequency axis, i.e., 12 subcarriers. The BS can configure the downlink control channel allocation unit by connecting REG 803.

[0208] like Figure 8As shown, when the basic unit for allocating downlink control channels in an 8G system is a Control Channel Element (CCE) 804, one CCE 804 can include multiple REG 803s. In the context of... Figure 8 In the description of REG 803 shown as an example, REG 803 can include 12 REs, and when one CCE 804 includes 6 REG 803s, one CCE 804 can include 72 REs. When configuring a downlink CORESET, the corresponding area can include multiple CCE 804s, and a specific downlink control channel can be mapped to one or more CCE 804s according to the aggregation level (AL) within the CORESET before transmission. CCE 804s within a CORESET can be distinguished by numbering, and the CCE 804 numbers can be assigned according to a logical mapping scheme.

[0209] Figure 8 The basic unit of the downlink control channel shown, REG 803, can include all REs mapped to by the DCI and the area mapped to by DMRS 805 as a reference signal for decoding the REs. Figure 8 As shown, three DMRS 805s can be transmitted within one REG 803. Depending on the aggregation level (AL), the number of CCEs required to transmit the PDCCH can be 1, 2, 4, 8, or 16, and different numbers of CCEs can be used to implement link adaptation of the downlink control channel. For example, if AL=L, a downlink control channel can be transmitted with L CCEs. According to embodiments of this disclosure, the UE should detect the signal while unaware of information about the downlink control channel and define a search space indicating a set of CCEs to perform blind decoding in a wireless communication system (e.g., a 5G or NR system). The search space is a set of downlink control channel candidates, including CCEs that the UE should attempt to decode at a given aggregation level, and there are several aggregation levels where a set of CCEs is configured with 1, 2, 4, 8, and 16 CCEs, so the UE can have multiple search spaces. The search space set can be defined as a set of search spaces across all configured aggregation levels.

[0210] The search space can be categorized into a common search space and a UE-specific search space. UEs or all UEs in a pre-defined group can search the common search space of the PDCCH to receive cell common control information, such as dynamic scheduling for system information or paging messages. For example, searching (monitoring) the common search space of the PDCCH can receive PDSCH scheduling allocation information for transmitting SIBs, which include information about the cell's service provider. In the case of a common search space, UEs or all UEs in the pre-defined group should receive the PDCCH, so the common search space can be defined as a set of pre-arranged CCEs. UE-specific PDSCH or PUSCH scheduling allocation information can be received by searching the UE-specific search space of the PDCCH. The UE-specific search space can be defined as a function of the UE identifier and various system parameters.

[0211] According to embodiments of this disclosure, the BS can configure parameters for the search space of PDCCH in a wireless communication system (e.g., 5G or NR system) in the UE via higher-layer signaling (e.g., SIB, MIB, or RRC signaling). For example, the BS can configure in the UE the number of PDCCH candidates for each aggregation level L, the monitoring period of the search space, the monitoring timing in units of symbols within the time slots of the search space, the search space type (i.e., common search space or UE-specific search space), the DCI format, and the combination of RNTIs to be monitored in the corresponding search space, as well as the control resource set index for monitoring the search space. For example, the following information from Table 9 may be included.

[0212] Table 9

[0213]

[0214]

[0215] The BS can configure one or more search space sets in the UE based on configuration information. According to some embodiments, the BS can configure search space set 1 and search space 2 in the UE, and can perform this configuration such that DCI format A scrambled by X-RNTI in search space set 1 is monitored in a common search space, and DCI format B scrambled by Y-RNTI is monitored in a UE-specific search space.

[0216] Depending on the configuration information, one or more search space sets may exist in the public search space or the UE-specific search space. For example, search space set #1 and search space set #2 can be configured as a public search space, and search space set #3 and search space set #4 can be configured as UE-specific search spaces.

[0217] In the public search space, the following combinations of DCI format and RNTI can be monitored. Of course, this disclosure is not limited to the following examples.

[0218] -DCI format 0_0 / 1_0, where CRC is scrambled using C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, and SI-RNTI.

[0219] -DCI format 2_0, where CRC is scrambled via SFI-RNTI.

[0220] -DCI format 2_1, where CRC is scrambled via INT-RNTI

[0221] -DCI format 2_2, where CRC is scrambled using TPC-PUSCH-RNTI and TPC-PUCCH-RNTI.

[0222] -DCI format 2_3, where CRC is scrambled via TPC-SRS-RNTI.

[0223] Within a UE-specific search space, the following combinations of DCI format and RNTI can be monitored. Of course, this disclosure is not limited to the following examples.

[0224] -DCI format 0_0 / 1_0, where CRC is scrambled using C-RNTI, CS-RNTI, and TC-RNTI.

[0225] -DCI format 1_0 / 1_1, where CRC is scrambled using C-RNTI, CS-RNTI, and TC-RNTI.

[0226] The RNTI described may follow the following definitions and uses.

[0227] - Cell RNTI (C-RNTI): Used for scheduling UE-specific PDSCH

[0228] - Temporary Cell RNTI (TC-RNTI): Used for UE-specific PDSCH scheduling

[0229] -Configuration Scheduling (CS)-RNTI: UE-specific PDSCH scheduling for semi-static configuration

[0230] Random Access RNTI (RA-RNTI): Used for PDSCH scheduling during the random access phase.

[0231] - Paging RNTI (P-RNTI): Used for PDSCH scheduling, through which paging is sent.

[0232] - System Information RNTI (SI-RNTI): Used for PDSCH scheduling, through which system information is sent.

[0233] - Interrupt RNTI (INT-RNTI): Used to indicate whether to punch a hole in the PDSCH.

[0234] -PUSCH RNTI transmit power control (TPC-PUSCH-RNTI): Used to indicate PUSCH power control commands.

[0235] -PUCCH RNTI Transmit Power Control (TPC-PUCCH-RNTI): Used to indicate PUCCH power control commands.

[0236] - SRS RNTI Transmit Power Control (TPC-SRS-RNTI): Used to indicate SRS power control commands.

[0237] The DCI format can follow the definitions in Table 10.

[0238] Table 10

[0239]

[0240] According to embodiments of this disclosure, the search space of the control resource set p and the aggregation level L in the search space set s of a wireless communication system (e.g., a 5G or NR system) can be represented by the following equation 1.

[0241] [Equation 1]

[0242]

[0243] - L: Aggregation Level

[0244] - Carrier index

[0245] - : The total number of CCEs existing in the control resource set p

[0246] - Time slot index

[0247] - Number of PDCCH candidates at aggregation level L

[0248] - = 0,..., Candidate indexes for PDCCH at aggregation level L

[0249] - i=0,...,L-1

[0250] - , , , , And D=65537.

[0251] - Terminal Identifier

[0252] In the context of public search spaces, The value can correspond to 0.

[0253] In the case of a specific search space for the UE The value can correspond to a value that is changed by the UE's identifier (C-RNTI or ID configured by the base station for the UE) and time index.

[0254] In a wireless communication system (e.g., a 5G or NR system) according to embodiments of this disclosure, since multiple search space sets can be configured with different parameters (e.g., the parameters in Table 9), the set of search space sets monitored by the UE at each time point may differ. For example, when search space set #1 is configured on time slot X and search space set #2 is configured on time slot Y, and X and Y are different from each other, the UE can monitor all search space sets #1 and #2 in a specific time slot and monitor one of search space sets #1 and #2 in another specific time slot.

[0255] [PUCCH: Send related]

[0256] In an NR system, a UE can send control information (UCI) to a base station via PUCCH. The control information may include at least one of HARQ-ACK, scheduling request (SR), and channel state information (CSI). HARQ-ACK indicates whether the demodulation / decoding of a transport block (TB) received by the UE via PDSCH was successful. SR requests the PUSCH base station to allocate resources for the UE to transmit uplink data. CSI is information used to report the channel state of the UE.

[0257] Based on the length of the allocated symbols, PUCCH resources can be broadly categorized into long PUCCHs and short PUCCHs. In NR systems, long PUCCHs have a length of 4 or more symbols within a time slot, while short PUCCHs have a length of 2 or fewer symbols within a time slot.

[0258] To explain long PUCCH in more detail, long PUCCH can be used to improve uplink cell coverage orientation and therefore can be transmitted in Discrete Fourier Transform Spread Spectrum OFDM (DFT-S-OFDM), a single-carrier transmission method rather than OFDM transmission. Long PUCCH supports transmission formats such as PUCCH Format 1, PUCCH Format 3, and PUCCH Format 4, depending on the number of control information bits that can be supported and whether UE multiplexing is supported through pre-DFT orthogonal coverage code (OCC) before inverse fast Fourier transform (IFFT).

[0259] First, PUCCH format 1 is a long PUCCH format based on DFT-S-OFDM, which can support up to 2 bits of control information and uses 1 RB of frequency resources. The control information can consist of a combination of HARQ-ACK and SR or each of them. PUCCH format 1 consists of OFDM symbols including a demodulation reference signal (or reference signal) (DMRS) and repeating OFDM symbols including UCI.

[0260] For example, when the number of transmitted symbols in PUCCH format 1 is 8, it can be composed sequentially from the first start symbol of the 8 symbols: DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol, DMRS symbol, UCI symbol. The DMRS symbol can use orthogonal codes (or orthogonal sequences or spreading codes) on the time axis within a single OFDM symbol. Spread spectrum is performed in a sequence corresponding to a length of 1 RB on the frequency axis, and then transmitted after performing IFFT.

[0261] UCI symbols can be generated by the UE using binary phase shift keying (BPSK) to modulate 1 bit of control information and quadrature phase shift keying (QPSK) to modulate 2 bits of control information. The generated d(0) is then scrambled by multiplying it by a sequence corresponding to a length of 1 RB on the frequency axis, and finally by using orthogonal codes (or orthogonal sequences or spreading codes). The scrambled sequence is spread on the time axis and then transmitted after the UE performs an IFFT.

[0262] The UE generates a sequence based on the group transition configured by upper-layer signaling or sequence transition configuration and the configuration ID from the base station, and cyclically shifts the sequence generated by the initial cyclic shift (CS) value configured by upper-layer signaling to generate a sequence corresponding to a 1RB length.

[0263] When the length of the spreading code (NSF) is given, identified as The details are shown in Table 11 below. i represents the index of the spreading code itself, and m represents the index of an element of the spreading code. Here, the numbers in [ ] in Table 11 represent... For example, if the length of the spreading code is 2 and the index of the configured spreading code is i=0, then the spreading code w i (m) becomes , Therefore w i (m) = [1 1].

[0264] Table 11

[0265]

[0266] Next, PUCCH format 3 is a long PUCCH format based on DFT-S-OFDM, which can support more than 2 bits of control information, and the number of RBs used can be configured by the upper layer. The control information can consist of a combination of HARQ-ACK, SR, and CSI, or each of them individually. In PUCCH format 3, the DMRS symbol positions are shown in Table 12 below, depending on whether frequency hopping occurs within the time slot and whether additional DMRS symbols are configured.

[0267] Table 12

[0268]

[0269] For example, if the number of transmitted symbols in PUCCH format 3 is 8, then DMRS is sent to the first and fifth symbols, starting from 0 for the first start symbol out of the 8 symbols. Table 12 applies in the same way to the DMRS symbol positions in PUCCH format 4.

[0270] Next, PUCCH format 4 is a long PUCCH format based on DFT-S-OFDM, which can support more than 2 bits of control information and uses 1 RB of frequency resources. The control information can consist of a combination of HARQ-ACK, SR, and CSI, or each of them individually. The difference between PUCCH format 4 and PUCCH format 3 is that PUCCH format 4 can multiplex PUCCH format 4 for multiple UEs within a single RB. Multiple UEs' PUCCH format 4 can be multiplexed by applying a pre-DFT orthogonal overlay code (OCC) to the control information in the IFFT front end. However, the number of control information symbols that a UE can send decreases depending on the number of UEs being multiplexed. The number of UEs that can be multiplexed (i.e., the number of different OCCs that can be used) can be 2 or 4, and the number of OCCs and the index of the OCCs to be applied can be configured by the upper layer.

[0271] Next, we describe the short PUCCH. The short PUCCH can be transmitted in both the downlink center time slot and the uplink center time slot, and is typically transmitted in the last symbol of the time slot or in the subsequent OFDM symbols (e.g., the last OFDM symbol, the penultimate OFDM symbol, or the last two OFDM symbols). Of course, the short PUCCH can be transmitted at any position within the time slot. Furthermore, the short PUCCH can be transmitted using one or two OFDM symbols. When uplink cell coverage is good, the short PUCCH can be used to reduce latency compared to the long PUCCH and can be transmitted using the CP-OFDM method.

[0272] Depending on the number of control information bits that can be supported, short PUCCHs can support transmission formats such as PUCCH format 0 and PUCCH format 2. First, PUCCH format 0 is a short PUCCH format that can support up to 2 bits of control information and uses 1 RB of frequency resources. The control information can consist of a combination of HARQ-ACK and SR, or each of them. PUCCH format 0 does not transmit DMRS and is configured to transmit only a sequence mapped to 12 subcarriers on a frequency axis within an OFDM symbol. The UE can generate the sequence based on group transitions or sequence transitions configured by upper-layer signals from the base station and the configured ID, and cyclically shift the generated sequence with the final CS value obtained by adding another CS value to the indicated initial cyclic shift (CS) value, depending on whether it is ACK or NACK, and map it to the 12 subcarriers for transmission.

[0273] For example, when HARQ-ACK is 1 bit, if it is ACK, the UE can generate the final CS by adding 6 to the initial CS value; if it is NACK, the UE can generate the final CS by adding 0 to the initial CS, as shown in Table 13 below. The CS value of 0 for NACK and the CS value of 6 for ACK are defined in the standard, and the UE can send a 1-bit HARQ-ACK by generating PUCCH format 0 according to the values ​​defined in the standard.

[0274] Table 13

[0275]

[0276] For example, when HARQ-ACK is 2 bits, if (NACK, NACK) the UE adds 0 to the initial CS value, if (NACK, ACK) the UE adds 3, if (ACK, ACK) the UE adds 6, and if (ACK, NACK) the UE adds 9, as shown in Table 14 below. The standard defines a CS value of 0 for (NACK, NACK), 3 for (NACK, ACK), 6 for (ACK, ACK), and 9 for (ACK, NACK). The UE can generate PUCCH format 0 based on the values ​​defined in the standard to send a 2-bit HARQ-ACK. If the final CS value exceeds 12 due to adding the CS value to the initial CS value based on ACK or NACK, then since the sequence length is 12, a modulo 12 can be applied to the final CS value.

[0277] Table 14

[0278]

[0279] Next, PUCCH format 2 is a short PUCCH format that can support more than 2 bits of control information, and the number of RBs used can be configured by the upper layer. The control information can consist of a combination of HARQ-ACK, SR, and CSI, or each of them individually. When the index of the first subcarrier is #0, PUCCH format 2 can be fixed to subcarriers with indices #1, #4, #7, and #10, where DMRS is transmitted within one OFDM symbol. The control information can be mapped to the remaining subcarriers, excluding the subcarrier containing DMRS, through the modulation process after channel coding.

[0280] In summary, the values ​​and ranges that can be configured for each of the above PUCCH formats can be organized as shown in Table 15 below. In Table 15, the case where no configuration value is required is represented by NA.

[0281] Table 15

[0282]

[0283] To improve uplink coverage, multi-slot repetition can be supported for PUCCH formats 1, 3, and 4, and PUCCH repetition can be configured for each PUCCH format. The UE can perform repetitive transmission of PUCCHs including UCIs, with the same number of slots as configured via nrofSlots as upper-layer signaling. For PUCCH repetition, PUCCH transmission in each slot is performed using the same number of consecutive symbols, and the corresponding number of consecutive symbols can be configured via nrofSymbols in upper-layer signaling PUCCH-format1, PUCCH-format3, or PUCCH-format4. For PUCCH repetition, PUCCH transmission in each slot is performed using the same start symbol, and the corresponding start symbol can be configured via startingSymbolIndex in upper-layer signaling PUCCH-format1, PUCCH-format3, or PUCCH-format4. For PUCCH repetition, a single PUCCH-spatialRelationInfo can be configured for a single PUCCH resource. For PUCCH retransmission, if the UE is configured to perform frequency hopping in PUCCH transmissions across different time slots, the UE can perform frequency hopping on a time slot basis. Furthermore, if the UE is configured to perform frequency hopping in PUCCH transmissions across different time slots, the UE can start PUCCH transmission from the first PRB index configured via the upper-layer signaling startingPRB in even-numbered time slots, and can start PUCCH transmission from the second PRB index configured via the upper-layer signaling secondHopPRB in odd-numbered time slots. Additionally, if the UE is configured to perform frequency hopping in PUCCH transmissions across different time slots, the index of the time slot indicating the first PUCCH transmission to the UE is 0, and the PUCCH retransmission count can be incremented during the total number of configured PUCCH retransmissions, regardless of the PUCCH transmission performance in each time slot. If the UE is configured to perform frequency hopping in PUCCH transmissions across different time slots, the UE does not expect to configure frequency hopping within a time slot when transmitting PUCCH. If the UE is not configured to perform frequency hopping in PUCCH transmissions across different time slots, but is instead configured to perform frequency hopping within a single time slot, then the first and second PRB indices can be applied equally within that time slot. If the number of uplink symbols that can transmit PUCCH is less than the nrofSymbols configured via upper-layer signaling, the UE may not transmit PUCCH. Even if the UE fails to transmit PUCCH in a time slot for any reason during PUCCH retransmission, the UE may increase the number of PUCCH retransmissions.

[0284] In NR Release 17, the number of slots for repeating transmission for each PUCCH resource in PUCCHResourceExt can be configured by the upper layer signaling pucch-RepetitionNrofSlots-r17. PUCCH ResourceExt is an extension of the upper layer signaling PUCCH-Resource for PUCCH resources. If the corresponding upper layer signaling pucch-RepetitionNrofSlots-r17 is configured, the corresponding PUCCH resource is scheduled, and the upper layer signaling nrofSlots is also configured, the UE determines the number of slots for repeating transmission for the corresponding PUCCH resource through pucch-RepetitionNrofSlots-r17 and ignores the upper layer signaling nrofSlots.

[0285] [PUCCH: Transmission Power Related]

[0286] As an example of an embodiment of the present disclosure, a method for a UE to configure and transmit the transmission power of a physical uplink control channel when transmitting uplink control information through a physical uplink control channel (PUCCH) in response to a power control command received from a base station is described. The transmission power (P PUCCH ) of the UE's uplink control channel and the PUCCH power control adjustment state and closed-loop index l corresponding to the i-th transmission unit can be determined as shown in Equation 2 below, which is expressed in dBm. In Equation 2 below, when the UE supports multiple carrier frequencies in multiple cells, each parameter can be determined separately for the primary cell c, carrier frequency f, and bandwidth part b, and can be distinguished by the indices b, f, and c.

[0287] [Equation 2]

[0288]

[0289] - : The maximum transmission power available to the UE in the i-th transmission unit, which is determined by the UE's power class, parameters activated by the base station, and various parameters embedded in the UE.

[0290] - : can be composed of the sum of and . is a cell-specific value configured through the cell-specific upper layer signaling p0-nominal, and if there is no corresponding configuration, can be 0 dBm. It is a UE-specific value configured through the bandwidth portion b, carrier frequency f, and the p0-PUCCH-Value in the upper-layer signaling p0-PUCCH of the primary cell c, and q u It can be greater than or equal to 0 and less than q. u The value of q, and q u It can represent a set The value can be configured via the upper-layer signaling maxNrofPUCCH-P0-PerSet. This group The value can be configured via the upper-layer signaling p0-Set, and if no corresponding configuration is provided, it can be considered as... =0.

[0291] - μ: Subcarrier spacing configuration value

[0292] - It can represent the amount of resources used in the bandwidth portion b, carrier frequency f, and the i-th PUCCH transmission unit within the primary cell c (e.g., the number of resource blocks (RBs) used for PUCCH transmission on the frequency axis).

[0293] - Pathloss represents the path loss between the base station and the UE, and is calculated based on the reference signal (RS) resource q notified by the base station. d The path loss is calculated by the difference between the transmit power and the received signal level of the UE's reference signal.

[0294] - For PUCCH format 0, if upper-layer signaling deltaF-PUCCH-f0 is configured, the corresponding value is used; for PUCCH format 1, if upper-layer signaling deltaF-PUCCH-f1 is configured, the corresponding value is used; for PUCCH format 2, if upper-layer signaling deltaF-PUCCH-f2 is configured, the corresponding value is used; for PUCCH format 3, if upper-layer signaling deltaF-PUCCH-f3 is configured, the corresponding value is used; for PUCCH format 4, if upper-layer signaling deltaF-PUCCH-f4 is configured, the corresponding value is used; and for all PUCCH formats, if no upper-layer signaling is configured, 0 can be used.

[0295] - The bandwidth component b, carrier frequency f, and PUCCH transmit power adjustment factor within the main cell c can be calculated using different methods depending on the PUCCH format.

[0296] - This can represent the PUCCH power control adjustment status value of the i-th PUCCH transmission unit corresponding to the closed-loop index l within the main cell, including bandwidth portion b, carrier frequency f, and the main cell c. Here, the closed-loop power adjustment for PUCCH transmission can use an accumulation method, which accumulates and applies the value indicated by the TPC command.

[0297] PUCCH power control adjustment status It can be determined by the bandwidth portion b, the carrier frequency f, the main cell c, the i-th transmitting unit, and the closed-loop index l.

[0298] - It can be the value indicated by the TPC command field included in DCI format 1_0, 1_1 or 1_2, which schedules the i-th PUCCH transmission unit corresponding to the closed-loop index l and PDSCH reception in the bandwidth portion b, carrier frequency f and main cell c, or the value indicated by the TPC command field included in DCI format 2_2, which is transmitted together with the CRC scrambled by TPC-PUCCH-RNTI.

[0299] If the UE is configured with twoPUCCH-PC-AdjustmentStates and PUCCH-SpatialRelationInfo as upper-layer signaling, the value of the closed-loop index l can be 0 or 1.

[0300] If the UE is not configured with twoPUSCH-PC-AdjustmentStates or PUCCH-SpatialRelationInfo as upper-layer signaling, the value of the closed-loop index l can be 0.

[0301] If the UE obtains the TPC command value through the TPC command field included in the DCI format 1_0, 1_1, or 1_2 received via the scheduling PDSCH, and the UE has configured the upper-layer signaling PUCCH-SpatialRelationInfo, then the UE can obtain the connection relationship between the pucch-SpatialRelationInfoId value and the closedLoopIndex value configured for the closed-loop index l based on the index configured through the upper-layer signaling p0-PUCCH-Id. If the UE receives a MAC-CE corresponding to pucch-SpatialRelationInfoId, then the UE can determine the closedLoopIndex value configured for the closed-loop index l based on the corresponding p0-PUCCH-Id index.

[0302] If the UE obtains a TPC command value from the TPC command field included in DCI format 2_2, which is sent together with a CRC scrambled with TPC-PUCCH-RNTI, then the l value can be obtained based on the closed-loop index field included in DCI format 2_2.

[0303] - In the bandwidth portion b, carrier frequency f, and main cell c, the PUCCH power control adjustment state of the i-th PUCCH transmission unit corresponding to the closed-loop index l can be calculated as shown in Equation 3. .

[0304] [Equation 3]

[0305]

[0306] o As mentioned above, This can be the value indicated by the TPC command field included in DCI formats 1_0, 1_1, or 1_2, which schedules the m-th PUCCH transmission unit corresponding to the closed-loop index l within the bandwidth portion b, carrier frequency f, and primary cell c; or the value indicated by the TPC command field included in DCI format 2_2, transmitted along with a CRC scrambled via TPC-PUCCH-RNTI. When TPC command accumulation is feasible, The value may have a corresponding value in [dB], depending on the value of the TPC command field included in DCI formats 1_0, 1_1, 1_2, or 2_2, as shown in Table 18. For example, if the value of the TPC command field is 0, then The value can be -1dB.

[0307] ○ It can represent a specific set C i All transmitting units corresponding to the aforementioned TPC command values The sum. In this case, c(C) i ) can represent belonging to set C i The number of all elements. C i This can represent a set of DCIs, including all TPC command values ​​used to perform the TPC command accumulation operation on the i-th PUCCH transmitting unit. To determine C... i A start and end point can be defined in the time dimension, and all DCIs received by the UE within these two points can be used as C. i The elements are included.

[0308] Used to determine C i The endpoint can be K symbols earlier than the start symbol of the i-th PUCCH transmission unit. PUCCH (i) points of symbols.

[0309] Used to determine C i The starting point can be K earlier than the start symbol of the (i-i0)th PUCCH transmission unit. PUCCH Points with (i-i0)-1 symbols. In this case, the positive integer i0 can be determined as the minimum value satisfying the following condition: (The value is less than the value used to determine C). i The endpoint (starting from the start symbol of the i-th PUCCH transmission unit, in K) PUCCH (i) points before the symbols) early K PUCCH The time point of the (i-i0)th symbol is an earlier time point than the start symbol time of the (i-i0)th PUCCH transmission unit.

[0310] For example, when used to determine C i The endpoint can be defined as sym(i), and K starts from the start symbol of the (i-i0)th PUCCH transmission unit. PUCCH If the time point before (i-i0) symbols can be defined as sym(i-i0), then if sym(i) = sym(i-1) > sym(i-2) > sym(i-3) holds true, then i0 can be determined as 2.

[0311] [PUSCH: Regarding the transmission scheme]

[0312] Next, the PUSCH transmission scheduling scheme will be described. PUSCH transmissions can be dynamically scheduled by UL authorization within the DCI, or operated through configured authorization type 1 or type 2. Dynamic scheduling instructions for PUSCH transmissions can be given via DCI format 0_0 or 0_1.

[0313] Configuration type 1 PUSCH transmissions can be semi-statically configured via upper-layer signaling receiving of the configuration `configuredGrantConfig` (including `rrc-ConfiguredUplinkGrant` in Table 16) without receiving UL authorizations within the DCI. After receiving a `configuredGrantConfig` (excluding `rrc-ConfiguredUplinkGrant` in Table 16) via upper-layer signaling, UL authorizations within the DCI can be semi-persistently scheduled for configuration type 2 PUSCH transmissions. If the PUSCH transmission is operated by a configuration authorization, the parameters applied to the PUSCH transmission are applied via `configuredGrantConfig` (upper-layer signaling) in Table 16, except for the scaling of `dataScramblingIdentityPUSCH`, `txConfig`, `codebookSubset`, `maxRank`, and `UCI-OnPUSCH` provided by `pusch-Config` (upper-layer signaling) in Table 17. If transformPrecoder is provided in configuredGrantConfig (upper-layer signaling) in Table 16, the UE will apply tp-pi2BPSK in pusch-Config in Table 17 to PUSCH transmissions by the configured grant operation.

[0314] Table 16

[0315]

[0316]

[0317] Next, the PUSCH transmission method will be described. The DMRS antenna port used for PUSCH transmission is the same as the antenna port used for SRS transmission. PUSCH transmission can follow either a codebook-based or non-codebook-based transmission method depending on whether the txConfig value in the pusch-Config, which serves as upper-layer signaling, is "codebook" or "nonCodebook".

[0318] As described above, PUSCH transmission can be dynamically scheduled via DCI format 0_0 or 0_1, and can be semi-statically configured via configured authorization. Upon receiving a scheduling instruction for PUSCH transmission via DCI format 0_0, the UE performs beam configuration for PUSCH transmission using the pucch-spatialRelationInfoID corresponding to the UE-specific PUCCH resource with the smallest ID within the active uplink BWP in the serving cell, and PUSCH transmission is based on a single antenna port. The UE does not expect PUSCH transmission to be scheduled via DCI format 0_0 within a BWP that does not have a PUCCH resource configured with pucch-spatialRelationInfo. If the UE has not configured txConfig in pusch-Config in Table 17, the UE does not expect scheduling via DCI format 0_1.

[0319] Table 17

[0320]

[0321]

[0322] Next, codebook-based PUSCH transmission will be described. Codebook-based PUSCH transmission can be dynamically scheduled using DCI format 0_0 or 0_1, and can be semi-statically configured with configured grants. If codebook-based PUSCH is dynamically scheduled using DCI format 0_1, or semi-statically configured with configured grants, the UE determines the precoder used for PUSCH transmission based on the SRS Resource Indicator (SRI), the Transmit Precoding Matrix Indicator (TPMI), and the transmission rank (the number of PUSCH transmission layers).

[0323] SRIs can be indicated via SRS resource indicators (fields within the DCI) or configured via srs-ResourceIndicator (upper-layer signaling). During codebook-based PUSCH transmission, the UE configures at least one SRS resource and can configure up to two SRS resources. If an SRI is provided to the UE via the DCI, the SRS resource indicated by the corresponding SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted prior to the PDCCH including the corresponding SRI. Furthermore, TPMI and transmission rank can be given via "Precoding Information and Number of Layers" (fields within the DCI) or configured via precodingAndNumberOfLayers (upper-layer signaling). TPMI is used to indicate the precoder to be applied to PUSCH transmission. If one SRS resource is configured for the UE, TPMI indicates the precoder to be applied to the configured SRS resource. If multiple SRS resources are configured for the UE, TPMI indicates the precoder to be applied to the SRS resources indicated by the SRI.

[0324] The precoder used for PUSCH transmission is selected from the uplink codebook of antenna ports, which has the same number of antenna ports as the value of nrofSRS-Ports in the SRS-Config (upper-layer signaling). In conjunction with codebook-based PUSCH transmission, the UE determines the codebook subset based on the codebookSubset and TPMI in the push-Config (upper-layer signaling). Based on the UE capabilities reported to the base station, the codebookSubset in the push-Config (upper-layer signaling) can be configured as one of "fullyAndPartialAndNonCoherent", "partialAndNonCoherent", or "noncoherent". If the UE reports "partialAndNonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as "fullyAndPartialAndNonCoherent". Furthermore, if the UE reports "nonCoherent" as a UE capability, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as either "fullyAndPartialAndNonCoherent" or "partialAndNonCoherent". If nrofSRS-Ports in SRS-ResourceSet (upper-layer signaling) indicates two SRS antenna ports, the UE does not expect the value of codebookSubset (upper-layer signaling) to be configured as "partialAndNonCoherent".

[0325] A UE can configure an SRS resource set, where the purpose value in the SRS-ResourceSet (upper-layer signaling) is "codebook", and can indicate an SRS resource through the SRI in the corresponding SRS resource set. If multiple SRS resources are configured in the SRS resource set, and the purpose value in the SRS-ResourceSet (upper-layer signaling) is "codebook", the UE expects the value of nrofSRS-Ports in the SRS-Resource (upper-layer signaling) to be the same for all SRS resources.

[0326] The UE transmits one or more SRS resources included in the SRS resource set to the base station, where the usage value is configured as a "codebook" according to the upper-layer signaling. The base station selects an SRS resource from the SRS resources transmitted by the UE and uses the transmission beam information of the corresponding SRS resource to indicate that the UE can transmit PUSCH. Combined with codebook-based PUSCH transmission, the SRI is used as an index for selecting an SRS resource and is included in the DCI. In addition, the base station adds information to the DCI indicating the rank and TPMI used by the UE for PUSCH transmission. By using the SRS resource indicated by the SRI, the UE applies a precoder based on the rank and TPMI indicated by the transmission beam of the corresponding SRS resource when performing PUSCH transmission, thereby performing PUSCH transmission.

[0327] Next, we will describe non-codebook-based PUSCH transmission. Non-codebook-based PUSCH transmission can be dynamically scheduled using DCI format 0_0 or 0_1, and can be semi-statically operated using configured authorization. If at least one SRS resource is configured in the SRS resource set, and the purpose value in the SRS-ResourceSet (upper-layer signaling) is "nonCodebook", then non-codebook-based PUSCH transmission can be scheduled for the UE using DCI format 0_1.

[0328] For an SRS resource set with a usage value of "nonCodebook" within the SRS-ResourceSet (upper-layer signaling), a connected non-zero power CSI-RS (NZP CSI-RS) resource can be configured for the UE. The UE can calculate the precoder for SRS transmission by measuring the NZP CSI-RS resource connected to the SRS resource set. If the difference between the last received symbol of the non-periodic NZP CSI-RS resource connected to the SRS resource set and the first symbol of the non-periodic SRS transmission in the UE is less than 42 symbols, the UE does not expect the information about the precoder for SRS transmission to be updated.

[0329] If the resourceType configuration value in the SRS-ResourceSet (upper-layer signaling) is "aperiodic", then the connected NZP CSI-RS is indicated by an SRS request, which is a field within DCI format 0_1 ​​or 1_1. If the connected NZP CSI-RS resource is an aperiodic NZP CSI-RS resource, then the presence of a connected NZP CSI-RS is indicated by a value for the SRS request (a field within DCI format 0_1 ​​or 1_1) that is not "00". The corresponding DCI should not indicate cross-carrier or cross-BWP scheduling. Furthermore, if the SRS request value indicates the presence of an NZP CSI-RS, then the NZP CSI-RS is located in the time slot used to transmit the PDCCH including the SRS request field. In this case, the TCI state configured for the scheduled subcarrier is not configured as QCL-TypeD.

[0330] If a periodic or semi-persistent SRS resource set is configured, the associated CSI-RS within the SRS-ResourceSet (upper-layer signaling) can indicate the connected NZP CSI-RS. Regarding non-codebook-based transmissions, the UE does not expect the upper-layer signaling spatialRelationInfo for SRS resources and the associated CSI-RS within the SRS-ResourceSet (upper-layer signaling) to be configured together.

[0331] If multiple SRS resources are configured for the UE, the UE can determine the precoder and transmission rank to be applied to PUSCH transmission based on the SRI indicated by the base station. The SRI can be indicated by the SRS resource indicator (a field within the DCI) or configured via the srs-ResourceIndicator (upper-layer signaling). Similar to the codebook-based PUSCH transmission described above, if the SRI is provided to the UE via the DCI, the SRS resource indicated by the corresponding SRI refers to the SRS resource corresponding to the SRI among the SRS resources transmitted before the PDCCH including the corresponding SRI. The UE can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be transmitted simultaneously in the same symbol within an SRS resource set and the maximum number of SRS resources are determined by the UE's capabilities reported to the base station. SRS resources transmitted simultaneously by the UE occupy the same RB. The UE configures one SRS port for each SRS resource. There may be only one configured SRS resource set, where the usage value within the SRS-ResourceSet (upper-layer signaling) is "nonCodebook," and a maximum of four SRS resources can be configured for non-codebook-based PUSCH transmission.

[0332] The base station may send a NZP-CSI-RS that is connected to an SRS resource set to the UE, and the UE may calculate a precoder to be used when transmitting one or more SRS resources in the corresponding SRS resource set based on the measurement results when receiving the corresponding NZP-CSI-RS. The UE applies the calculated precoder when transmitting one or more SRS resources in the SRS resource set to the base station, where the configured usage is "nonCodebook", and the base station selects one or more SRS resources from the received one or more SRS resources. In combination with non-codebook-based PUSCH transmission, the SRI indication may represent an index of a combination of one SRS resource or multiple SRS resources, and the SRI is included in the DCI. The number of SRS resources indicated by the SRI sent by the base station may be the number of transmission layers of the PUSCH, and the UE transmits the PUSCH by applying the precoder applied to the SRS resource transmission to each layer.

[0333] [PUSCH: Transmission Power Related]

[0334] As an example of an embodiment of the present disclosure, a method for a UE to configure and transmit the transmission power of a physical uplink shared channel (PUSCH) when transmitting uplink data in response to a power control command received from a base station is described. The uplink shared channel transmission power of the UE, the PUSCH power control adjustment status corresponding to the i-th transmission unit, the parameter set configuration index j, and the closed-loop index l may be determined as shown in Equation 4 below, which is expressed in dBm. In Equation 4 below, when the UE supports multiple carrier frequencies in multiple cells, each parameter may be determined separately for cell c, carrier frequency f, and bandwidth part b, and may be distinguished by indices b, f, and c.

[0335] [Equation 4]

[0336]

[0337] - : The maximum transmission power available to the UE in the i-th transmission unit, which is determined by the power class of the UE, the parameters activated by the base station, and various parameters embedded in the UE.

[0338] - : consists of the sum of and . is a value configured for the UE through cell-specific upper layer signaling, and This is a value configured to the UE via UE-specific upper-layer signaling. Here, when j=0, it represents the PUSCH used to send msg3; when j=1, it represents the configured authorized PUSCH; and when j is one of the values ​​of {2, ..., j-1}, it represents the authorized PUSCH.

[0339] - μ: Subcarrier spacing configuration value

[0340] - It can represent the amount of resources used in the i-th PUSCH transmission unit (e.g., the number of resource blocks (RBs) used for PUSCH transmission on the frequency axis).

[0341] - It represents a value that can be determined by upper-layer configuration and SRS resource indicator (SRI) (in the case of dynamic grant PUSCH) as a value to compensate for path loss.

[0342] - Pathloss represents the path loss between the base station and the UE, and is calculated based on the reference signal (RS) resource q notified by the base station. d The path loss is calculated by the difference between the transmit power and the received signal level of the UE's reference signal. This indicates that the UE uses a reference signal index q. d The downlink path loss is estimated using the reference signal, and the reference signal index q is used for estimation. d It can be determined by the UE through upper-layer configuration and SRI (in the case of dynamic authorization PUSCH or configuration authorization PUSCH based on ConfigurationGrantConfig which does not include upper-layer configuration rrc-ConfiguredUplinkGrant (type 2 configuration authorization PUSCH)) or through upper-layer configuration.

[0343] - It represents the value determined by the format of the information transmitted on the modulation and coding scheme (MCS) and PUSCH (TF: transmission format, e.g., whether it includes UL-SCH or CSI).

[0344] - This represents the closed-loop power control adjustment value, i.e., the value of the closed-loop index l, which can be determined by the upper-layer configuration and the SRI of PUSCH. Here, the closed-loop power adjustment sent by PUSCH can be supported by either an accumulation method that applies the value indicated by the accumulated TPC command or an absolute method that directly applies the value indicated by the TPC command, and can be determined based on whether the upper-layer parameter tpc-Accumulation is configured. If the upper-layer parameter tpc-Accumulation is configured to be disabled, the closed-loop power adjustment sent by PUSCH is performed using the absolute method; otherwise, if tpc-Accumulation is not configured, the closed-loop power adjustment sent by PUSCH is performed using the accumulation method.

[0345] PUSCH power control adjustment status It can be determined by the bandwidth portion b, the carrier frequency f, the cell c, the i-th transmitting unit, and the closed-loop index l.

[0346] - It can be the value indicated by the TPC command field included in DCI format 0_0, 0_1 or 0_2, which schedules the i-th PUSCH transmission unit corresponding to the closed-loop index l in the bandwidth portion b, carrier frequency f and cell c, or the value indicated by the TPC command field included in DCI format 2_2, which is transmitted together with the CRC scrambled by TPC-PUCCH-RNTI.

[0347] If the UE is configured with the upper-layer signaling twoPUSCH-PC-AdjustmentStates, the value of the closed-loop index l can be 0 or 1.

[0348] If the UE is not configured with upper-layer signaling twoPUSCH-PC-AdjustmentStates or uses PUSCH with RAR UL authorization for transmission scheduling, the value of the closed-loop index l can be 0.

[0349] If the UE is configured with the upper-layer signaling ConfiguredGrantConfig and performs PUSCH transmission or retransmission accordingly, the closed-loop index l can follow the upper-layer signaling powerControlLoopToUse value.

[0350] If the UE is configured with upper-layer signaling SRI-PUSCH-PowerControl, the UE can obtain the connection relationship between the value indicated by the SRS Resource Indicator (SRI) field in the DCI format sent by the scheduling PUSCH and the closed-loop index l configured by the upper-layer signaling sri-PUSCH-ClosedLoopIndex, and determine the closed-loop index l based on the value indicated by the SRI field in the DCI format based on the corresponding connection relationship.

[0351] If the UE is scheduled to transmit PUSCH based on the DCI format without the SRI field, or if the upper-layer signaling SRI-PUSCH-PowerControl is not configured, the UE can treat the closed-loop index l as 0.

[0352] If the UE is indicated by the TPC command value in the TPC command field included in DCI format 2_2, which is sent together with the CRC scrambled with TPC-PUSCH-RNTI, then the closed-loop index l can be indicated by the closed-loop index field included in DCI format 2_2.

[0353] - If the UE is not configured with upper-layer signaling TPC-Accumulation, i.e., if the UE may perform TPC command accumulation operations, then the PUSCH power control adjustment state of the i-th PUSCH transmission unit corresponding to the closed-loop index l in the cell can be calculated as shown in Equation 5, based on the bandwidth portion b, carrier frequency f, and cell c. .

[0354] [Equation 5]

[0355]

[0356] o As mentioned above, This can be the value indicated by the TPC command field included in DCI format 0_0, 0_1, or 0_2, which schedules the m-th PUSCH transmission unit corresponding to the closed-loop index l within the bandwidth portion b, carrier frequency f, and primary cell c; or the value indicated by the TPC command field included in DCI format 2_2, transmitted together with CRC scrambled via TPC-PUCCH-RNTI. When TPC command accumulation is feasible, The value may have a corresponding value in [dB], depending on the value of the TPC command field included in DCI format 0_0, 0_1, 0_2, or 2_2, as shown in Table 18. For example, if the value of the TPC command field is 0, then The value can be -1dB.

[0357] o It can represent a specific set D iAll transmitting units corresponding to the aforementioned TPC command values The sum. In this case, c(D) i ) can represent belonging to set D i The number of all elements. D i This can represent a set of DCIs, including all TPC command values ​​used to perform the TPC command accumulation operation on the i-th PUSCH sending unit. To determine D... i A start and end point can be defined in the time dimension, and all DCIs received by the UE within these two points can be used as DCIs. i The elements are included.

[0358] Used to determine D i The endpoint can be K symbols earlier than the start symbol of the i-th PUSCH transmission unit. PUSCH (i) points of symbols.

[0359] Used to determine D i The starting point can be K symbols earlier than the start symbol of the (i-i0)th PUSCH transmission unit. PUSCH Points with (i-i0)-1 symbols. In this case, the positive integer i0 can be determined as the minimum value satisfying the following condition: (The value used to determine D) i The endpoint (starting from the start symbol of the i-th PUSCH transmission unit, in K) PUSCH (i) points before the symbols) early K PUSCH The time point of the (i-i0)th symbol is an earlier time point than the start symbol time of the (i-i0)th PUSCH transmission unit.

[0360] For example, when used to determine D i The endpoint can be defined as sym(i), and K starts from the start symbol of the (i-i0)th PUSCH transmission unit. PUSCH If the time point before (i-i0) symbols can be defined as sym(i-i0), then if sym(i) = sym(i-1) > sym(i-2) > sym(i-3) holds true, then i0 can be determined as 2.

[0361] - If the UE is configured with upper-layer signaling TPC-Accumulation, i.e., if the UE cannot perform TPC command accumulation, then the PUSCH power control adjustment state of the i-th PUSCH transmission unit corresponding to the closed-loop index l in the cell can be calculated as shown in Equation 6, in relation to bandwidth portion b, carrier frequency f, and cell c. .

[0362] [Equation 6]

[0363]

[0364] o As mentioned above, This can be the value indicated by the TPC command field included in DCI format 0_0, 0_1, or 0_2, which schedules the i-th PUCCH transmission unit corresponding to the closed-loop index l within the bandwidth portion b, carrier frequency f, and cell c; or the value indicated by the TPC command field included in DCI format 2_2, transmitted along with CRC scrambled via TPC-PUCCH-RNTI. When TPC command accumulation is not feasible... The value may have a corresponding value in [dB], depending on the value of the TPC command field included in DCI format 0_0, 0_1, 0_2, or 2_2, as shown in Table 18. For example, if the value of the TPC command field is 0, then The value can be -4dB.

[0365] Table 18

[0366]

[0367] [About SRS]

[0368] Next, an uplink channel estimation method using the UE's Sounding Reference Signal (SRS) will be described. The base station can configure at least one SRS configuration for each uplink base station (BWP) to transmit configuration information for SRS transmission to the UE, and can also configure at least one SRS resource set for each SRS configuration. For example, the base station and the UE can exchange upper-layer signaling information as follows to transmit information about the SRS resource set.

[0369] -srs-ResourceSetId: SRS resource set index

[0370] -srs-ResourceIdList: A set of SRS resource indexes referenced by the SRS resource set.

[0371] -resourceType: The time-domain transmission configuration of the SRS resources referenced by the SRS resource set, and can be configured as "Periodic," "Semi-Persistent," or "Aperiodic." If configured as "Periodic" or "Semi-Persistent," associated CSI-RS information can be provided based on the location where the SRS resource set is used. If configured as "Aperiodic," aperiodic SRS resource trigger list / slot offset information can be provided, and associated CSI-RS information can be provided based on the location where the SRS resource set is used.

[0372] - Purpose: Configures the usage location of SRS resources referenced by the SRS resource set, and can be configured as one of "beamManagement", "codebook", "non-codebook" and "antennaSwitching".

[0373] -α, p0, pathlossReferenceRS, srs-PowerControlAdjustmentStates: Provides parameter configuration for adjusting the transmit power of the SRS resources referenced by the SRS resource set.

[0374] The UE can understand that the SRS resources included in a set of SRS resource indexes referenced by the SRS resource set follow the information configured for the SRS resource set.

[0375] In addition, the base station and UE can send / receive upper-layer signaling information to transmit individual configuration information about SRS resources. For example, individual configuration information about SRS resources may include time-frequency domain mapping information within the time slots of the SRS resources, which may include information about frequency hopping within or between time slots of the SRS resources. Individual configuration information about SRS resources may include the time-domain transmission configuration of the SRS resources and may be configured as "periodic," "semi-persistent," and "aperiodic." The time-domain transmission configuration of the SRS resources may be restricted to having the same time-domain transmission structure as the SRS resource set that includes the SRS resources. If the time-domain transmission configuration of the SRS resources is configured as "periodic" or "semi-persistent," the time-domain transmission configuration may also include the SRS resource transmission period and time slot offset (e.g., periodicityAndOffset).

[0376] The base station can activate or deactivate the UE's SRS transmission via upper-layer signaling, including RRC signaling, MAC CE signaling, or L1 signaling (e.g., DCI). For example, the base station can activate or deactivate the UE's periodic SRS transmission via upper-layer signaling. The base station can indicate the activation of an SRS resource set with a resourceType configured as "periodic" via upper-layer signaling, and the UE can transmit SRS resources referenced in the activated SRS resource set. The intra-slot time-frequency domain resource mapping of the transmitted SRS resources follows the resource mapping information configured for the SRS resources, and the slot mapping, including the transmission period and slot offset, follows the periodicityAndOffset configured for the SIR resources. Furthermore, the spatial domain transmission filter applied to the transmitted SRS resources can refer to the spatial relationship information configured for the SRS resources, or it can refer to the relevant CSI-RS information configured for the SRS resource set including the SRS resources. The UE can transmit SRS resources within the uplink BWP activated for periodic SRS resources activated via upper-layer signaling.

[0377] For example, a base station can activate or deactivate a UE's semi-persistent SRS transmission via upper-layer signaling. The base station can indicate the activation of an SRS resource set via MAC CE signaling, and the UE can transmit the SRS resources referenced by the activated SRS resource set. The SRS resource set activated via MAC CE signaling can be restricted to an SRS resource set with a resourceType configured as "semi-persistent". The intra-slot time-frequency domain resource mapping of the transmitted SRS resources follows the resource mapping information configured for the SRS resources, and the slot mapping, including the transmission period and slot offset, follows the periodicityAndOffset configured for the SRS resources. Furthermore, the spatial domain transmission filter applied to the transmitted SRS resources can refer to the spatial relation information configured for the SRS resources, or it can refer to the relevant CSI-RS information configured for the SRS resource set including the SRS resources. If the SRS resources have spatial relation information configured for this purpose, the spatial domain transmission filter can be determined by referring to the configuration information about the spatial relation information transmitted via MAC CE signaling activating semi-persistent SRS transmission, without having to follow the same configuration information. The UE can transmit SRS resources within the uplink BWP activated for semi-persistent SRS resources activated via upper-layer signaling.

[0378] For example, a base station can trigger aperiodic SRS transmission by a UE via a DCI. The base station can indicate one of the aperiodic SRS triggers (aperiodicSRS-ResourceTrigger) via the SRS request field of the DCI. The UE understands that the SRS resource set, which includes the aperiodic SRS resource trigger indicated by the DCI in the aperiodic SRS resource trigger list in the SRS resource set configuration information, has been triggered. The UE can transmit the SRS resource referenced by the triggered SRS resource set. The time-frequency domain resource mapping within the time slot of the transmitted SRS resource follows the resource mapping information configured for the SRS resource. Furthermore, the time slot mapping of the transmitted SRS resource can be determined by the time slot offset between the SRS resource and the PDCCH including the DCI, which can refer to the values ​​included in the time slot offset set configured for the SRS resource set. Specifically, as the time slot offset between the SRS resource and the PDCCH including the DCI, the value indicated in the time domain resource allocation field of the DCI can be applied from the offset values ​​included in the time slot offset set configured for the SRS resource set. Furthermore, the spatial domain transmission filter applied to the transmitted SRS resources can refer to the spatial relationship information configured for the SRS resources, or it can refer to the relevant CSI-RS information configured for the SRS resource set including the SRS resources. The UE can transmit SRS resources within the uplink BWP activated for aperiodic SRS resources triggered by DCI.

[0379] If the base station triggers aperiodic SRS transmission by the UE via DCI, a minimum time interval may be required between the transmitted SRS and the PDCCH containing the DCI that triggers the aperiodic SRS transmission, allowing the UE to transmit the SRS by applying configuration information about the SRS resources. The time interval for the UE to transmit SRS can be defined as the number of symbols between the last symbol of the PDCCH containing the DCI that triggers the aperiodic SRS transmission and the first symbol in the transmitted SRS resources mapped to the first transmitted SRS source. The minimum time interval can be determined with reference to the PUSCH preparation time required for the UE to prepare for PUSCH transmission. Furthermore, the minimum time interval can have different values ​​depending on the usage location of the SRS resource set including the transmitted SRS resources. For example, the minimum time interval can be determined as N² symbols, defined considering the UE's processing capacity, which follows the UE's capabilities, with reference to the UE's PUSCH preparation time. Furthermore, if the usage location of the SRS resource set, including the transmitted SRS resources, is configured as "codebook" or "antennaSwitching," the minimum time interval can be determined to be N² symbols. If the usage location is configured as "nonCodebook" or "beamManagement," the minimum time interval can be determined to be N²+14 symbols. If the time interval used for aperiodic SRS transmission is greater than or equal to the minimum time interval, the UE can transmit aperiodic SRS. If the time interval used for aperiodic SRS transmission is less than the minimum time interval, the UE can ignore the DCI that triggers aperiodic SRS.

[0380] Table 19

[0381]

[0382]

[0383] Referring to a reference signal, the configuration information spatialRelationInfo in Table 19 above is applied to the beam used for SRS transmission corresponding to the beam information of the corresponding reference signal. For example, the configuration of spatialRelationInfo may include the information in Table 20 below.

[0384] Table 20

[0385]

[0386] Referring to the spatialRelationInfo configuration above, the SS / PBCH block index, CSI-RS index, or SRS index can be configured as the index of a reference signal to be referenced, so as to use the beam information of a specific reference signal. The upper-layer signaling referenceSignal corresponds to the configuration information indicating which reference signal's beam information to reference in the corresponding SRS transmission. ssb-Index refers to the SS / PBCH block index, csi-RS-Index refers to the CSI-RS index, and srs refers to the SRS index. If the upper-layer signaling referenceSignal has the configuration value "ssb-Index", the UE can apply the receive beam used to receive the SS / PBCH block corresponding to ssb-Index as the transmit beam for the corresponding SRS transmission. If the upper-layer signaling referenceSignal has the configuration value "csi-RS-Index", the UE can apply the receive beam used to receive the CSI-RS corresponding to csi-RS-Index as the transmit beam for the corresponding SRS transmission. If the upper-layer signaling referenceSignal has the configuration value "srs", the UE can use the receive beam used to transmit the SRS corresponding to srs as the transmit beam for the corresponding SRS.

[0387] [SRS transmit power related]

[0388] As an example of an embodiment of this disclosure, a method is described for a UE to configure and transmit an uplink sounding reference signal (SRS) when transmitting the SRS in response to a power control command received from a base station. The UE's uplink sounding reference signal transmission power (P) SRS The SRS power control adjustment state and closed-loop index l corresponding to the i-th transmitting unit can be determined as shown in Equation 7 below, expressed in dBm. In Equation 7 below, when the UE supports multiple carrier frequencies in multiple cells, each parameter can be determined separately for cell c, carrier frequency f, and bandwidth portion b, and can be distinguished by indices b, f, and c.

[0389] [Equation 7]

[0390]

[0391] - The maximum transmit power available to the UE in the i-th transmit unit is determined by the UE's power level, the parameters activated by the base station, and various parameters embedded in the UE.

[0392] - It can be configured as p0, which is the upper-layer signaling for the bandwidth portion b, carrier frequency f, and cell c, and the SRS resource set q. s It can be configured through SRS-ResourceSet and SRS-ResourceSetId, which are used as upper-layer signaling.

[0393] - μ: Subcarrier spacing configuration value

[0394] - It can represent the amount of resources used in the i-th SRS transmission unit (e.g., the number of resource blocks (RBs) used for SRS transmission on the frequency axis).

[0395] - It can be configured as α, which is the upper-layer signaling for the bandwidth portion b, carrier frequency f, and cell c, and the SRS resource set q. s It can be configured through the upper-layer signaling SRS-ResourceSet and SRS-ResourceSetId.

[0396] - Pathloss represents the path loss between the base station and the UE, and is calculated based on the reference signal (RS) resource q notified by the base station. d The path loss is calculated by the difference between the transmit power and the received signal level of the UE's reference signal.

[0397] - It can represent the SRS power control adjustment status value of the bandwidth portion b, the carrier frequency f, and the i-th SRS transmitting unit corresponding to the closed-loop index l within cell c.

[0398] The SRS power control adjustment state can be determined by the bandwidth portion b, carrier frequency f, cell c, and the i-th transmitting unit.

[0399] - If the UE is configured to have the same power control adjustment state value between SRS transmission and PUSCH transmission via upper-layer signaling srs-PowerControlAdjustmentStates, then the SRS power control adjustment state can be expressed as Equation 8 below, and in Equation 8, This can represent the current PUSCH power control adjustment state. In this case, it can be calculated using the various methods described in Embodiment 1 above. And this value can be substituted into And use it.

[0400] [Equation 8]

[0401]

[0402] - If the UE is not configured for PUSCH transmission in bandwidth portion b, carrier frequency f, and cell c, or is not configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission via upper-layer signaling srs-PowerControlAdjustmentStates, and is not configured with upper-layer signaling tpc-Accumulation, then the SRS power control adjustment state can be expressed as independent of closed-loop l, as shown in Equation 9 below.

[0403] [Equation 9]

[0404]

[0405] - It can be the value indicated by the TPC command field included in DCI format 2_3, and the value can follow Table 18.

[0406] o It can represent a specific set S i All transmitting units corresponding to the aforementioned TPC command values Sum. In this case, c(S) i ) can represent belonging to set S i The number of all elements. S i This can represent a set of DCIs, including all TPC command values ​​used to perform the TPC command accumulation operation on the i-th PUSCH sending unit. To determine S... i A start and end point can be defined in the time dimension, and all DCIs received by the UE within these two points can be used as S. i The elements are included.

[0407] Used to determine S i The endpoint can be K before the start symbol of the i-th SRS transmitting unit. SRS (i) points of symbols.

[0408] Used to determine S i The starting point can be K earlier than the start symbol of the (i-i0)th SRS transmitting unit. SRS Points with (i-i0)-1 symbols. In this case, the positive integer i0 can be determined as the minimum value satisfying the following condition: (The value is less than the value used to determine S). i The endpoint (starting from the start symbol of the i-th SRS transmitting unit, in K) SRS (i) points before the symbols) early K SRS The time point of the (i-i0)th symbol is an earlier time point than the start symbol time of the (i-i0)th SRS transmitting unit.

[0409] For example, when used to determine Si The endpoint can be defined as sym(i), and K starts from the start symbol of the (i-i0)th SRS transmitting unit. SRS If the time point before (i-i0) symbols can be defined as sym(i-i0), then if sym(i) = sym(i-1) > sym(i-2) > sym(i-3) holds true, then i0 can be determined as 2.

[0410] - If the UE is not configured for PUSCH transmission in bandwidth portion b, carrier frequency f, and cell c, or is configured to have separate power control adjustment state values ​​between SRS transmission and PUSCH transmission via upper-layer signaling srs-PowerControlAdjustmentStates, and is configured with upper-layer signaling tpc-Accumulation (i.e., TPC command accumulation operation cannot be performed, absolute TPC command values ​​can be applied), then the SRS power control adjustment state can be represented as independent of closed-loop l, as shown in Equation 10 below.

[0411] [Equation 10]

[0412]

[0413] o As mentioned above, This can be the value indicated by the TPC command field included in DCI format 2_3 within the bandwidth portion b, carrier frequency f, and cell c, and this value can follow Table 18. For example, if the value of the TPC command field is 0, then... The value can be -4dB.

[0414] [Regarding UE Capability Report]

[0415] In wireless communication systems (e.g., LTE, 5G, or NR systems), a UE can perform a process to report the capabilities it supports to the corresponding BS while the UE is connected to the serving BS. In the following description, this is referred to as UE capability reporting.

[0416] The BS can send a UE capability query message to a UE in a connected state, requesting a capability report. This message can include UE capability requests for each Radio Access Technology (RAT) type of the BS. Requests for each RAT type can include supported frequency band combination information. In the case of a UE capability query message, multiple UE capabilities for various RAT types can be requested through a single RRC message container sent by the BS, or the BS can insert multiple UE capability query messages including UE capability requests for each RAT type and send them to the UE. That is, UE capability queries are repeated multiple times within a single message, and the UE can configure its corresponding UE capability information message and report it multiple times. In next-generation mobile communication systems, UE capability requests can be made for NR, LTE, E-UTRA-NR Dual Connectivity (EN-DC), and Multi-RAT Dual Connectivity (MR-DC). UE capability query messages are typically sent initially after the UE connects to the BS, but can be requested at any time the BS needs them.

[0417] In the above steps, the UE that receives a request for a UE capability report from the BS can configure UE capabilities according to the RAT type and frequency band information requested by the BS. The following describes a method for configuring UE capabilities in a wireless communication system (e.g., a 5G or NR system) according to embodiments of this disclosure.

[0418] 1. When a UE requests a list of LTE and / or NR frequency bands from a BS via a UE capability request, the UE configures a frequency band combination (BC) for EN-DC and NR Independent (SA). That is, the UE configures a BC candidate list for EN-DC and NRSA based on the frequency bands requested in the FreqBandList. The frequency bands are ordered according to the priorities specified in the FreqBandList.

[0419] 2. When the BS sets the “eutra-nr-only” flag or the “eutra” flag and requests a UE capability report, the UE completely removes NR SA BCs from the configured BC candidate list. This operation may only occur when the LTE BS (eNB) requests “eutra” capability.

[0420] 3. Subsequently, the UE removes the fallback BC from the BC candidate list configured in the above stage. The fallback BC is a BC obtained by removing the frequency band corresponding to at least one secondary cell (Scell) from the predetermined BCs, and the BCs before removing the frequency band corresponding to at least one Scell ​​can cover the fallback BC, therefore the fallback BC can be omitted. This stage applies to MR-DC, i.e., LTE frequency bands. The BCs remaining after this stage constitute the final "candidate BC list".

[0421] 4. The UE selects a BC suitable for the requested RAT type from the final "Candidate BC List" and chooses the BC to be reported. At this stage, the UE configures the supportedBandCombinationList according to a predetermined order. That is, the UE configures the BCs to be reported and UE capabilities according to the preset rat-Type (nr->eutra-nr->eutra) order. Furthermore, the UE configures featureSetCombination for the configured supportedBandCombinationList and configures a "Candidate Feature Set Combination" list in the candidate BC list, from which it receives the fallback BC list (including capabilities at the same or lower stages). The "Candidate Feature Set Combination" can include all feature set combinations for NR and EUTRA-NR BCs and can be obtained from feature set combinations in the UE-NR-Capabilities and UE-MRDC-Capabilities containers.

[0422] 5. When the requested RAT type is Eutra-NR and has an impact, featureSetCombinations are included in both containers of UE-MRDC-Capabilities and UE-NR-Capabilities. However, the NR feature set only includes UE-NR-Capabilities.

[0423] After configuring UE capabilities, the UE can transmit UE capability information messages, including the UE capabilities, to the BS. The BS can then perform scheduling and transmission / reception management of the corresponding UE based on the UE capabilities received from the UE.

[0424] [PDSCH: TCI state activates MAC-CE]

[0425] Next, the beam configuration method of PDSCH will be described.

[0426] Figure 9 The process of beam configuration and activation of a PDSCH according to an embodiment of this disclosure is illustrated.

[0427] Reference Figure 9The list of TCI states for the PDSCH can be indicated by a higher-level list such as RRC (900). The list of TCI states can be indicated, for example, by tci-StatesToAddModList and / or tci-StatesToReleaseList in the PDSCH-Config IE for each BWP. Next, some of the TCI states in the list can be activated via MAC-CE (920). The maximum number of activated TCI states can be determined based on the UE reporting capability. One of the TCI states activated via MAC-CE can be indicated by DCI (940). (950) shows an example of the MAC-CE structure for PDSCH TCI state activation / deactivation. The MAC CE may include the serving cell identifier, BWP ID, TCI state identifier (Ti), and CORESET pool ID 955.

[0428] [About NC-JT]

[0429] According to embodiments of this disclosure, in order to receive PDSCH from multiple TRPs, the UE can use noncoherent joint transmission (NC-JT).

[0430] Unlike conventional systems, wireless communication systems (e.g., 5G or NR systems) can support all services with very short transmission latency, services requiring high connection density, and services requiring high transmission rates. In wireless communication networks comprising multiple cells, transmit and receive points (TRPs) or beams, cooperative communication (coordinated transmission) between individual cells, TRPs, and / or beams can meet various service requirements by increasing the strength of the signal received by the UE or effectively controlling interference between cells, TRPs, and / or beams.

[0431] Joint transmission (JT) is a representative transmission technique for cooperative communication, and it can increase the signal strength or throughput received by a UE by transmitting signals to a UE through different cells, TRPs, and / or beams. In this case, the channel between each cell, TRP, and / or beam and the UE may have different characteristics. In particular, noncoherent joint transmission (NC-JT) supporting non-interference coding between individual cells, TRPs, and / or beams may require separate precoding, MCS, resource allocation, and TCI indication based on the channel characteristics of each link between each cell, TRP, and / or beam and the UE.

[0432] NC-JT can be applied to at least one of the following: downlink data channel (Physical Downlink Shared Channel (PDSCH)), downlink control channel (Physical Downlink Control Channel (PDCCH)), uplink data channel (Physical Uplink Shared Channel (PUSCH)), and uplink control channel (Physical Uplink Control Channel (PUCCH)). In PDSCH transmission, transmission information such as precoding, MCS, resource allocation, and TCI can be indicated via DL DCI and should be indicated independently for each cell, TRP, and / or the NC-JT beam. This is a major factor increasing the payload required for DL ​​DCI transmission, which can adversely affect the reception performance of the PDCCH used for DCI transmission. Therefore, to support JT for PDSCH, a careful trade-off between DCI information content and the reception performance of control information is required.

[0433] Figure 10 An example of antenna port configuration and resource allocation for transmitting PDSCH using cooperative communication in a wireless communication system is shown according to an embodiment of the present disclosure.

[0434] Reference Figure 10 Examples of PDSCH transmission are described for each scheme of Joint Transmission (JT), and examples of radio resource allocation for each TRP are described.

[0435] Reference Figure 10 Example 1000 is shown that supports coherent joint transmission (C-JT) with phase interference coding between individual cells, TRPs, and / or beams.

[0436] In the C-JT scenario, TRP A 1005 and TRP B 1010 send a single data transmission (PDSCH) to UE 1015, and multiple TRPs can perform joint precoding. This may mean that TRP A 1005 and TRP B 1010 transmit DMRS through the same DMRS port to send the same PDSCH. For example, TRP A 1005 and TRP B 1010 can send DMRS to the UE through DMRS port A and DMRS port B, respectively. In this case, the UE can receive a DCI message for receiving a PDSCH based on the DMRS demodulated through DMRS port A and DMRS port B.

[0437] Figure 10 Example 1020 is shown that supports non-coherent joint transmission (NC-JT) with non-interference coding between individual cells, TRPs, and / or beams for PDSCH transmission.

[0438] In the NC-JT scenario, PDSCH is sent to UE 1035 for each cell, TRP (e.g., TRP A 1025, TRP B 1030) and / or beam, and individual precoding can be applied to each PDSCH. Different cells, TRPs, and / or beams can send different PDSCHs or different PDSCH layers to the UE, thereby improving throughput compared to single-cell, TRP, or / or beam transmission. Furthermore, the same PDSCH can be repeatedly sent to the UE by each cell, TRP, and / or beam, thereby improving reliability compared to single-cell, TRP, or / or beam transmission. For ease of description, cells, TRPs, and / or beams are often referred to as TRPs.

[0439] At this point, various radio resource allocations can be considered. For example, in case 1040, multiple TRPs use the same frequency and time resources for PDSCH transmission; in case 1045, multiple TRPs use completely non-overlapping frequency and time resources; and in case 1050, some of the frequency and time resources used by multiple TRPs overlap with each other.

[0440] To support NC-JT, various forms, structures, and relationships of DCI can be considered to simultaneously allocate multiple PDSCHs to a UE.

[0441] Figure 11 An example of the configuration of downlink control information (DCI) for NC-JT according to an embodiment of the present disclosure is shown, wherein in a wireless communication system, each TRP sends different PDSCH or different PDSCH layers to the UE.

[0442] Reference Figure 11 Case #1 1100 is an example where (N-1) different PDSCHs are sent from (N-1) additional TRPs (from TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for a single PDSCH transmission. The control information for the PDSCHs sent from these (N-1) additional TRPs is transmitted independently of the control information for the PDSCHs sent by the serving TRP. That is, the UE can obtain the control information for PDSCHs sent from different TRPs (TRP #0 to TRP #(N-1)) through independent DCIs (DCI #0 to DCI #(N-1)). The formats of the independent DCIs can be the same or different from each other, and the payloads of the DCIs can also be the same or different. In Case #1, the freedom of PDSCH control or allocation is fully guaranteed; however, when sending individual DCIs through different TRPs, differences in DCI coverage may occur, and reception performance may degrade.

[0443] Case #2 1105 is an example in which (N-1) different PDSCHs are sent from (N-1) additional TRPs (from TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for sending a single PDSCH, and multiple control messages of the PDSCHs of the (N-1) additional TRPs are sent, and each DCI depends on the control message of the PDSCH sent from the serving TRP.

[0444] For example, DCI#0, which is the control information for PDSCH sent from the serving TRP (TRP#0), may include all the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2. However, the shortened DCI (hereinafter referred to as sDCI) (sDCI#0 to sDCI#(N-2)) for the control information of PDSCH sent from the cooperating TRPs (TRP#1 to TRP#(N-1)) may only include some of the information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2. Therefore, compared with the normal DCI (nDCI) used to send control information related to PDSCH sent from the serving TRP, the sDCI used to send control information for PDSCH sent from the cooperating TRP has a smaller payload and can therefore include reserved bits compared with the nDCI.

[0445] In case #2 1105, the degree of freedom for each PDSCH to control or allocate can be limited based on the content of the information elements included in the sDCI, but the receiving capability of the sDCI is superior to that of the nDCI, so the probability of differences between DCI coverage areas may be reduced.

[0446] Case #3 1110 is an example in which (N-1) different PDSCHs are sent from (N-1) additional TRPs (from TRP #1 to TRP #(N-1)) other than the serving TRP (TRP #0) used for sending a single PDSCH, and the DCI depends on the control information of the PDSCH sent from the serving TRP.

[0447] For example, in the case of DCI#0, which is the control information for PDSCH transmitted from the serving TRP (TRP#0), all information elements of DCI format 1_0, DCI format 1_1, and DCI format 1_2 can be included. However, in the case of control information for PDSCH transmitted from the cooperating TRP (TRP#1 to TRP#(N-1)), only some information elements from DCI format 1_0, DCI format 1_1, and DCI format 1_2 can be collected in a single “secondary” DCI (sDCI) and transmitted. For example, the sDCI can include at least one HARQ-related piece of information, such as frequency domain resource allocation and time domain resource allocation for the cooperating TRP and MCS. Furthermore, information not included in the sDCI, such as BWP indicators and carrier indicators, can follow the serving TRP's DCI (DCI#0, normal DCI, or nDCI).

[0448] In case #3 1110, the degree of freedom for PDSCH control or allocation can be limited based on the content of the information elements included in the sDCI, but the reception performance of the sDCI can be controlled, and case #3 1110 can have a smaller UE DCI blind decoding complexity compared to case #1 1100 or case #2 1105.

[0449] Case #4 1115 is an example where, in the case of sending different (N-1) PDSCHs from (N-1) additional TRPs (TRP#1 to TRP#(N-1)) other than the serving TRP (TRP#0) used for a single PDSCH transmission, the control information for the PDSCHs sent from the (N-1) additional TRPs is transmitted in the same DCI (long DCI) as the control information for the PDSCHs sent from the serving TRP. That is, the UE can obtain the control information for PDSCHs sent from different TRPs (TRP#0 to TRP#(N-1)) through a single DCI. In Case #4 1115, the complexity of the UE's blind DCI decoding may not increase, but the freedom of PDSCH control or allocation may be lower because the number of cooperating TRPs is limited by the long DCI payload constraints.

[0450] In the following description and embodiments, sDCI may refer to various supplementary DCIs, such as shortened DCIs, auxiliary DCIs, or normal DCIs (DCI formats 1_0 and 1_1) that include PDSCH control information sent in the cooperative TRP, and the corresponding descriptions may be similarly applied to various supplementary DCIs unless specific constraints are mentioned.

[0451] In the following description and embodiments, cases #11100, #2 1105, and #3 1110, which use one or more DCIs (or PDCCHs) to support NC-JT, can be classified as NC-JT based on multiple PDCCHs, while case #4 1115, which uses a single DCI (or PDCCH) to support NC-JT, can be classified as NC-JT based on a single PDCCH. In multiple PDCCH-based PDSCH transmissions, the CORESET of the DCI used to schedule the serving TRP (TRP#0) is separate from the CORESET of the DCI used to schedule the cooperating TRPs (TRP#1 to TRP#(N-1)). Methods for distinguishing CORESETs may include methods based on higher-level indicators for each CORESET and methods based on beam configuration for each CORESET. Furthermore, in NC-JT based on a single PDCCH, a single DCI schedules a single PDSCH with multiple layers, rather than scheduling multiple PDSCHs, and multiple layers can be transmitted from multiple TRPs. At this point, the association between the layer and the corresponding layer's TRP can be indicated by the Transmission Configuration Indicator (TCI) of that layer.

[0452] In embodiments of this disclosure, when applied in practice, “Cooperative TRP” can be replaced by various terms, such as “cooperative panel” or “cooperative beam”.

[0453] In the embodiments of this disclosure, depending on the circumstances, "the case of applying NC-JT" can be interpreted differently as "the case where the UE simultaneously receives one or more PDSCHs in a BWP", "the case where the UE simultaneously receives PDSCHs based on two or more Transmission Configuration Indicators (TCIs) in a BWP", and "the case where the PDSCHs received by the UE are associated with one or more DMRS port groups", but for ease of description, it is represented by one expression.

[0454] In this disclosure, the wireless protocol architecture used for NC-JT can be used differently depending on the TRP development scenario. For example, when there is no backhaul delay or a small backhaul delay exists between cooperating TRPs, it can be similar to... Figure 4 The attached diagram S10 uses a method based on a MAC layer multiplexing structure (a CA-like method). On the other hand, when the backhaul delay between cooperative TRPs is too large to be ignored (e.g., when it takes 2ms or longer to exchange information such as CSI, scheduling, and HARQ-ACK between cooperative TRPs), similar to... Figure 4 The attached figure S20 shows that a method (DC-like method) that ensures robustness to delay can be used through the independent structure of each TRP from the RLC layer.

[0455] UEs supporting C-JT and / or NC-JT can receive C-JT and / or NC-JT-related parameters or settings from higher-level configuration and set the UE's RRC parameters accordingly. For higher-level configuration, the UE can use UE capability parameters, such as tci-StatePDSCH. UE capability parameters (e.g., tci-StatePDSCH) can define the TCI states transmitted by the PDSCH. The number of TCI states can be configured as 4, 8, 16, 32, 64, and 128 in FR1 and 64 and 128 in FR2. The three bits of the TCI field of the DCI can indicate up to eight states, which can be configured from the configured number via MAC CE messages. The maximum value of 128 represents the value indicated by the maxNumberConfiguredTCIstatesPerCC parameter of tci-StatePDSCH included in the UE's capability signaling. As described above, a series of configuration procedures from higher-level configuration to MAC CE configuration can be applied to beamforming indications or beamforming change commands for at least one PDSCH in a TRP.

[0456] [Multi-DCI-based Multi-TRP]

[0457] As an embodiment of this disclosure, a multi-DCI-based multi-TRP transmission method is described. This multi-DCI-based multi-TRP transmission method can configure the downlink control channel for NC-JT transmission based on multiple PDCCHs.

[0458] In NC-JT based on multiple PDCCHs, when sending the DCI for scheduling the PDSCH for each TRP, there may be a separate CORESTE or search space for each TRP. The CORESTE or search space for each TRP can be configured as at least one of the following:

[0459] *Higher-level index configuration for each CORESET: The CORESET configuration information configured by higher levels can include index values, and the TRP used to send PDCCH in the corresponding CORESET can be identified by the configured index value of each CORESET. That is, in a group of CORESETs with the same higher-level index value, it can be assumed that the same TRP sends PDCCH, or sends PDCCH to schedule the same TRP's PDSCH. The index of each CORESET can be named CORESETPoolIndex, and it can be assumed that the PDCCH is sent from the same TRP in a CORESET with the same CORESETPoolIndex value. In CORESETs that do not have the same CORESETPoolIndex value configured, it can be assumed that the default value of CORESETPoolIndex is configured, and the default value can be 0.

[0460] In this disclosure, if each of the multiple CORESETs included in the upper-layer signaling PDCCH-Config has more than one type of CORESETPoolIndex, that is, if each CORESET has a different CORESETPoolIndex, then the UE may assume that the base station can use the multi-TRP transmission method based on multiple DCI.

[0461] In contrast, in this disclosure, if each of the multiple CORESETs included in the upper-layer signaling PDCCH-Config has only one type of CORESETPoolIndex, that is, if all CORESETs have the same CORESETPoolIndex of 0 or 1, then the UE can assume that the base station is using a single TRP for transmission instead of using a multi-TRP transmission method based on multiple DCIs.

[0462] *Configuration of Multiple PDCCH-Configs: Multiple PDCCH-Configs can be configured in a single BWP. Each PDCCH-Config can include the PDCCH configuration for each TRP. That is, a PDCCH-Config can include a list of CORESETs and / or a list of search spaces for each TRP, and one or more CORESETs and one or more search spaces included in a PDCCH-Config can be considered to correspond to a specific TRP.

[0463] *CORESET beam / beam group configuration: The TRP corresponding to a given CORESET can be identified by the beam or beam group configured for each CORESET. For example, when the same TCI state is configured in multiple CORESETs, it can be assumed that the corresponding CORESETs are transmitted through the same TRP, or that the PDCCH used to schedule the PDSCH of the same TRP is transmitted in the corresponding CORESET.

[0464] * Search Space Beam / Beam Group Configuration: Configure a beam or beam group for each search space and identify the TRP for each search space. For example, when the same beam / beam group or TCI state is configured in multiple search spaces, it can be assumed that the same TRP sends a PDCCH in the corresponding search space, or sends a PDCCH for scheduling the same TRP in the corresponding search space.

[0465] As described above, by separating the CORESET or search space of each TRP, PDSCH and HARQ-ACK can be partitioned for each TRP, and an independent HARQ-ACK codebook can be generated for each TRP accordingly, using independent PUCCH resources.

[0466] For each cell or BWP, the configuration can be independent. For example, while two different CORESETPoolIndex values ​​can be configured in the primary cell (PCell), a CORESETPoolIndex value cannot be configured in a specific SCell. In this case, it can be assumed that NC-JT is configured in the PCell, but not in the SCell where no CORESETPoolIndex value is configured.

[0467] The PDSCH TCI state activation / deactivation MAC-CE applicable to multi-DCI-based multi-TRP transmission methods can follow the following guidelines. Figure 9 .

[0468] If the UE does not configure a CORESETPoolIndex for each of all CORESETs in the upper-layer signaling PDCCH-Config, the UE can ignore the CORESET pool ID field 955 in the corresponding MAC-CE 950. If the UE can support a multi-DCI-based multi-TRP transmission method, i.e., if the UE has a CORESETPoolIndex in the upper-layer signaling PDCCH-Config that varies with different CORESETs, the UE can activate the TCI state in the DCI included in the PDCCH transmitted from a CORESET that has the same CORESETPoolIndex value as the CORESETPoolID field 955 value in the corresponding MAC-CE 950. For example, if the CORESET pool ID field 955 value in the corresponding MAC-CE 950 is 0, the TCI state in the DCI included in the PDCCH transmitted from a CORESET with a CORESETPoolIndex of 0 can follow the activation information of the corresponding MAC-CE.

[0469] If the UE is configured to use a multi-DCI-based multi-TRP transmission method from the base station, i.e., if each of the multiple CORESETs included in the upper-layer signaling PDCCH-Config has more than one type of CORESETPoolIndex, or if each CORESET has a different CORESETPoolIndex, then the UE can know that the following constraints exist for PDSCH scheduled from the PDCCH within each CORESET having two different CORESETPoolIndex.

[0470] 1) If the PDSCHs indicated by the PDCCHs within each CORESET with two different CORESETPoolIndexes are completely or partially overlapping, the UE can apply the TCI states indicated by each PDCCH to different Code Division Multiple Access (CDM) groups. That is, two or more TCI states may not be applicable to a single CDM group.

[0471] 2) If the PDSCH indicated by the PDCCH in each CORESET with two different CORESETPoolIndex completely or partially overlaps, the UE can expect that the actual number of preloaded DMRS symbols, the actual number of additional DMRS symbols, the location of the actual DMRS symbols, and the DMRS type of each PDSCH will not be different from each other.

[0472] 3) The UE can expect that the bandwidth portion indicated by the PDCCH within each CORESET with two different CORESETPoolIndex is the same, and the subcarrier spacing is also the same.

[0473] 4) The UE can expect that information about the PDSCH scheduled from the PDCCH within each CORESET with two different CORESETPoolIndex is fully included in each PDCCH.

[0474] [Multi-TRP based on a single DCI]

[0475] As an embodiment of this disclosure, a multi-TRP transmission method based on a single DCI is described. This single-DCI-based multi-TRP transmission method allows for the configuration of a downlink control channel for NC-JT transmission based on a single PDCCH.

[0476] In a multi-TRP transmission method based on a single DCI, a single DCI can be used to schedule PDSCH transmissions by multiple TRPs. In this case, the number of TCI states can be used as a method to indicate the number of TRPs transmitting the corresponding PDSCH. That is, if the number of TCI states indicated in the DCI scheduling the PDSCH is 2, it can be regarded as an NC-JT transmission based on a single PDCCH; if the number of TCI states is 1, it can be regarded as a single TRP transmission. The TCI states indicated in the aforementioned DCI can correspond to one or two TCI states activated by MAC-CE. When the TCI states in the DCI correspond to two TCI states activated by MAC-CE, a correspondence is established between the TCI code points indicated in the DCI and the TCI states activated by MAC-CE, and this may be when there are two TCI states activated by MAC-CE corresponding to the TCI code points.

[0477] As another example, if at least one of the code points in the TCI state field of the DCI indicates two TCI states, the UE can assume that the base station can transmit based on a single DCI multi-TRP method. In this case, at least one code point in the TCI state field indicating two TCI states can be activated by the enhanced PDSCH TCI state activation / deactivation MAC-CE.

[0478] Figure 12 This is a diagram illustrating an enhanced PDSCH TCI state activation / deactivation MAC-CE structure according to an embodiment of the present disclosure.

[0479] Reference Figure 12The meaning of each field in the Enhanced PDSCH TCI Status Activation / Deactivation MAC CE and the values ​​that can be configured for each field are shown in Table 21 below.

[0480] Table 21

[0481]

[0482] If the value of field C01205 is 1, then except for the TCI status ID 0,1 In addition to field 1210, MAC-CE may also include TCI status ID. 0,2 Field 1215. This means that for the 0th code point of the TCI state field included in the DCI, the TCI state ID... 0,1 and TCI status ID 0,2 If activated, and if the base station indicates the code point to the UE, the UE can be indicated with two TCI states. If the value of C0 field 1205 is 0, the MAC-CE may not include the TCI state ID. 0,2 Field 1215 means that for the 0th code point of the TCI state field included in the DCI, the TCI state ID is activated. 0,1 The corresponding TCI state.

[0483] The above configuration can be independent of each cell or each BWP. For example, a PCell can have up to two active TCI states corresponding to one TCI code point, while a specific SCell can have up to one active TCI state corresponding to one TCI code point. In this case, the PCell can be considered to be configured for NC-JT transmission, while the SCell is not configured for NC-JT transmission.

[0484] [A method for differentiating between multiple TRP PDSCH retransmission technologies based on a single DCI (Time Division Multiplexing (TDM) / Frequency Division Multiplexing (FDM) / User Data Management (SDM))]

[0485] Next, a method for distinguishing multiple TRP PDSCH retransmission techniques based on a single DCI is described. Depending on the value indicated by the DCI field from the base station and the upper-layer signaling configuration, the UE can indicate different multiple TRP PDSCH retransmission techniques based on a single DCI (e.g., TDM, FDM, SDM). Table 22 below shows the method for distinguishing the single or multiple TRP-based techniques indicated to the UE based on the value of a specific DCI field and the upper-layer signaling configuration.

[0486] Table 22

[0487]

[0488] In Table 22, each column can be described as follows.

[0489] - Number of TCI states (column 2): This indicates the number of TCI states indicated by the TCI state field in the DCI, which can be 1 or 2.

[0490] - Number of CDM Groups (Column 3): This indicates the number of different CDM groups for the DMRS port indicated by the antenna port field in the DCI. It can be 1, 2, or 3.

[0491] -repetitionNumbe configuration and indication conditions (column 4): This can have 3 conditions, depending on whether repetitionNumber is configured for all TDRA entries that the time-domain resource allocation field in the DCI may indicate, and whether the TDRA entry that is actually indicated has repetitionNumber configuration.

[0492] *Condition 1: If at least one of all TDRA entries that the Time Domain Resource Allocation field may indicate includes a repetitionNumber configuration, and if the TDRA entry indicated by the Time Domain Resource Allocation field in the DCI includes a repetitionNumber configuration greater than 1.

[0493] *Condition 2: If at least one of all TDRA entries that the Time Domain Resource Allocation field may indicate includes a repetitionNumber configuration, and if the TDRA entries indicated by the Time Domain Resource Allocation field in the DCI do not include a repetitionNumber configuration.

[0494] *Condition 3: If none of the TDRA entries that the Time Domain Resource Allocation field may indicate include the configuration of repetitionNumber.

[0495] - Related repetitionScheme configuration (column 5): This indicates whether an upper-layer signaling repetitionScheme is configured. The upper-layer signaling repetitionScheme can be configured as one of "tdmSchemeA", "fdmScheme A", and "fdmSchemeB".

[0496] - Transmission scheme indicated to the UE (Column 6): This refers to the single or multiple TRP schemes indicated according to each combination shown in Table 22 (Column 1).

[0497] *Single TRP: This refers to PDSCH transmission based on a single TRP. If the UE has configured pdsch-AggegationFactor in the upper-layer signaling PDSCH-config, repeated PDSCH transmissions based on a single TRP can be scheduled for the UE according to the configured number of times. Otherwise, the UE can be scheduled for single PDSCH transmissions based on a single TRP.

[0498] *Single TRP TDM Scheme B: This represents PDSCH retransmission based on time resource allocation between single TRP slots. According to condition 1 related to repetitionNumber mentioned above, the UE retransmits PDSCH multiple times in the time dimension, as many times as the number of slots with a repetitionNumber greater than 1 configured in the TDRA entry indicated by the time domain resource allocation field. In this case, for each slot with a repetitionNumber, the start symbol and symbol length of the PDSCH indicated by the TDRA entry are applied equally, and the same TCI state is applied to each PDSCH retransmission. This technique is similar to the slot aggregation method because it performs PDSCH retransmission between slots in the time resource allocation field, but it differs from slot aggregation in that it can dynamically determine whether to indicate retransmission based on the time domain resource allocation field in the DCI.

[0499] *Multi-TRP SDM: This refers to a PDSCH transmission method based on multi-TRP spatial resource partitioning. This method involves partitioning the reception layer from each TRP. While not a repetitive transmission method, it improves the reliability of PDSCH transmission because it can reduce the coding rate by increasing the number of layers. The UE can receive PDSCH using the two TCI states indicated by the TCI state field in each of the two CDM groups indicated by the base station.

[0500] *Multi-TRP FDM Scheme A: This refers to a frequency resource allocation PDSCH transmission method based on multi-TRP. It has a single PDSCH transmission position (timing), therefore it does not involve repeated transmission like multi-TRP SDM. Instead, it is a technique that can achieve high-reliability transmission by increasing the amount of frequency resources and reducing the coding rate. Multi-TRP FDM Scheme A can apply two TCI states indicated by the TCI state field in the DCI to non-overlapping frequency resources. If the PRB bundle size is determined to be wideband, when the number of RBs indicated by the frequency domain resource allocation field is N, the UE applies the first TCI state to the first ceil (N / 2) RBs and the second TCI state to the remaining floor (N / 2) RBs. Here, ceil (.) and floor (.) are operators representing rounding up and down to one decimal place, respectively. If the PRB bundle size is determined to be 2 or 4, even-numbered precoded resource block groups (PRGs) are received by applying the first TCI state, while odd-numbered PRGs are received by applying the second TCI state.

[0501] *Multi-TRP FDM Scheme B: This refers to a frequency resource allocation PDSCH transmission method based on multi-TRP. It has two PDSCH transmission positions (timings), allowing PDSCH to be transmitted repeatedly at each position. Similar to Scheme A, Multi-TRP FDM Scheme B applies two TCI states indicated by the TCI state field in the DCI to non-overlapping frequency resources. If the PRB bundle size is determined to be wideband, when the number of RBs indicated by the frequency domain resource allocation field is N, the UE applies the first TCI state to the first ceil (N / 2) RBs and the second TCI state to the remaining floor (N / 2) RBs. Here, ceil (.) and floor (.) are operators representing rounding up and down to one decimal place, respectively. If the PRB bundle size is determined to be 2 or 4, even-numbered PRGs are received by applying the first TCI state, while odd-numbered PRGs are received by applying the second TCI state.

[0502] *Multi-TRP TDM Scheme A: This refers to a method of repeatedly transmitting PDSCH within a time slot based on multi-TRP time resource allocation. The UE has two PDSCH transmission positions (timings) within a time slot, and the first reception position can be determined based on the start symbol and symbol length of the PDSCH indicated by the time domain resource allocation field in the DCI. The start symbol of the second reception position of the PDSCH can be the position of the symbol offset from the last symbol of the first transmission position, applied using the upper-layer signaling StartingSymbolOffsetK, and the transmission position can be determined by the symbol length indicated therefrom. If the upper-layer signaling StartingSymbolOffsetK is not configured, the symbol offset can be considered 0.

[0503] *Multi-TRP TDM Scheme B: This indicates the use of a PDSCH retransmission method between time slots based on multi-TRP time resource allocation. The UE has one PDSCH transmission position (timing) within a time slot and can receive retransmissions based on the start symbol and symbol length of the same PDSCH, according to the time domain resource allocation field in the DCI, for the number of time slots indicated by repetitionNumber. If repetitionNumber is 2, the UE can receive retransmissions of the first and second time slots by applying the first TCI state and the second TCI state respectively. If repetitionNumber is greater than 2, the UE can use different TCI state application methods according to the configured upper-layer signaling tciMapping. If tciMapping is configured as cyclicMapping, the first and second TCI states are applied to the first and second PDSCH transmission positions respectively, and the same TCI state application method is applied to the remaining PDSCH transmission positions. If tciMapping is configured as sequentialMapping, the first TCI state is applied to the first and second PDSCH transmission positions, the second TCI state is applied to the third and fourth PDSCH transmission positions, and the same TCI state application method is applied to the remaining PDSCH transmission positions.

[0504] In the present disclosure below, upper-layer signaling (or upper-level signaling) is a signaling method in which a base station transmits signals to a UE using a downlink data channel of the physical layer, or a UE transmits signals to a base station using an uplink data channel of the physical layer, and may be referred to as RRC signaling, PDCP signaling, or Media Access Control (MAC) control element (CE).

[0505] In the following disclosure, the UE may use various methods to determine whether cooperative communication has been applied. For example, the PDCCH to which the PDSCH to which cooperative communication is applied has a specific format; the PDCCH to which the PDSCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is applied; the PDCCH to which the PDSCH to which cooperative communication is applied is scrambled with a specific RNTI; or it may be assumed that cooperative communication is applied in a specific part indicated to the upper layer. For ease of explanation below, the case in which the UE receives the PDSCH to which cooperative communication is applied based on conditions similar to those described above is referred to as the NC-JT case.

[0506] In the following disclosure, the priority between A and B can be determined in various ways, such as selecting the one with higher priority according to a predetermined priority rule and performing the corresponding operation, or omitting or abandoning the operation with lower priority.

[0507] As used herein, upper-layer signaling (or “upper-layer signaling”) is a method of transmitting signals from a base station to a UE using downlink data channels of the physical layer, or from a UE to a base station using uplink data channels of the physical layer, and may also be referred to as “RRC signaling”, “PDCP signaling”, or “MAC control element (MAC CE)”.

[0508] In the following, within this disclosure, the UE may use various methods to determine whether cooperative communication is applied. For example, the PDCCH to which cooperative communication is applied has a specific format, or the PDCCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is applied, or the PDCCH to which cooperative communication is applied is scrambled with a specific RNTI, or it may be assumed that cooperative communication is applied within a specific range indicated by the upper layer. In the following, for ease of description, it will be assumed that the NC-JT case refers to the case where the UE receives a PDSCH to which cooperative communication is applied based on conditions similar to those described above.

[0509] In the following text, determining the priority between A and B can be described differently, for example, selecting the entity with higher priority according to a predetermined priority rule and performing the corresponding operation, or omitting or abandoning the operation on the entity with lower priority.

[0510] The above examples can be described below through several embodiments, but they are not independent of each other and one or more embodiments can be applied simultaneously or in combination.

[0511] In the following text, for ease of description, the cell, transmitter, panel, beam, and / or transmitter direction, which can be distinguished by upper-layer / L1 parameters (such as TCI status or spatial relationship information, cell ID, TRP ID, or panel ID), can be collectively described as TRP, beam, or TCI status. Therefore, in practical applications, TRP, beam, or TCI status can be appropriately replaced with one of the aforementioned terms.

[0512] In the following, within this disclosure, the UE may use various methods to determine whether cooperative communication is applied. For example, the PDCCH to which cooperative communication is applied has a specific format, or the PDCCH to which cooperative communication is applied includes a specific indicator indicating whether cooperative communication is applied, or the PDCCH to which cooperative communication is applied is scrambled with a specific RNTI, or it may be assumed that cooperative communication is applied within a specific range indicated by the upper layer. In the following, for ease of description, it will be assumed that the NC-JT case refers to the case where the UE receives a PDSCH to which cooperative communication is applied based on conditions similar to those described above.

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

[0514] -MIB (Master Information Block)

[0515] -SIB (System Information Block) or SIB X (X=1, 2...)

[0516] -RRC (Radio Resource Control)

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

[0518] L1 signaling can be signaling corresponding to at least one or a combination of one or more of the following signaling methods that use physical layer channels or signaling.

[0519] -PDCCH (Physical Downlink Control Channel)

[0520] -DCI (Downlink Control Information)

[0521] -UE-specific DCI

[0522] -Public DCI Group

[0523] -Public DCI

[0524] - Scheduling DCI (e.g., DCI used to schedule downlink or uplink data)

[0525] - Non-scheduled DCI (e.g., DCI other than the DCI used to schedule downlink or uplink data)

[0526] -PUCCH (Physical Uplink Control Channel)

[0527] -UCI (Uplink Control Information)

[0528] The term "slot" as used in the following disclosure is a general term that can refer to a specific unit of time corresponding to a transmission time interval (TTI), specifically, a slot used in a 5G NR system, or a slot or subframe in a 4G LTE system.

[0529] <First Embodiment: Method for Configuring Transmit Power Parameters When Supporting Unified TCI State>

[0530] As one embodiment of this disclosure, a method for configuring the transmission of power parameters to a UE when the UE supports a unified TCI state is described. This embodiment can be operated in conjunction with other embodiments.

[0531] The UE can be configured with upper-layer signaling ServingCellConfig from the base station. In addition, the UE can be configured with upper-layer signaling MIMOParam-r17 in ServingCellConFIG. The specific upper-layer signaling structures of ServingCellConfig and MIMOParam-r17 are shown in Table 23 below.

[0532] Table 23

[0533]

[0534] As described in Table 23, the UE can be configured with upper-layer signaling unifiedTCI-StateType-r17 from the base station within MIMOParam-r17, the value of which can be individual or combined.

[0535] - If the UE is configured with separate upper-layer signaling unifiedTCI-StateType-r17, this may mean that when receiving configurations and indications related to unified TCI states from the base station, the UE can be separately configured and indicated as a TCI state suitable for downlink reception (e.g., DL TCI state) and a TCI state suitable for uplink transmission (e.g., UL TCI state). In this case, the UE can be configured with upper-layer signaling OrJointTCI-StateList and ul-TCI-ToAddModList from the base station, representing lists of DL TCI states and UL TCI states, respectively.

[0536] - If the UE is configured with the unified upper-layer signaling unifiedTCI-StateType-r17, this may mean that when receiving configurations and indications related to unified TCI states from the base station, the UE can configure and indicate TCI states applicable to downlink reception and uplink transmission in a unified manner (e.g., joint TCI states). In this case, the UE may be configured with the upper-layer signaling dl-OrJointTCI-StateList from the base station, which represents a list of joint UL TCI states.

[0537] Referring to Table 23, the UE can configure the uplink-PowerControlToAddModList in MIMOParam-r17. If the UE has configured the unifiedTCI-StateType in the corresponding serving cell, the uplink-PowerControlToAddModList can include transmit power control parameters for PUSCH, PUCCH, and SRS. The uplink-PowerControlToAddModList can include a list of up to 64 Uplink-powerControl-r17 and Uplink-powerControlId-r17. The uplink-powerControl-r17 can have the structure shown in Table 24 below.

[0538] Referring to Table 23, the UE can configure pathlossReferenceLinking in ServingCellConFIG (indicating whether the UE should use the downlink of the SpCell (PCell for MCG or PSCell for SCG) or the SCell corresponding to that uplink as a path loss reference). Upper-layer signaling pathlossReferenceLinking can indicate whether the UE references the list of reference signals used for path loss measurement in the SpCell (PCell for MCG or PSCell for SCG) or SCell.

[0539] Table 24

[0540]

[0541] As shown in Table 24, the UE can include ul-powercontrolId-r17 in one Uplink-powerControl-r17 parameter, and can be configured with separate P0AlphaSet-r17 for PUSCH, PUCCH or SRS respectively, and each P0AlphaSet-r17 can include the above uplink transmit power parameters p0, α and closed loop index.

[0542] The upper-layer signaling in Table 23 can be applied to all bandwidth portions within the corresponding serving cell. Table 25 below shows the upper-layer signaling structure that the UE can configure for each uplink bandwidth portion (e.g., BWP-UplinkDedicated).

[0543] Table 25

[0544]

[0545] As shown in Table 25, the UE can be configured with upper-layer signaling ul-TCI-StateList-r17 (which indicates the applicable UL TCI states for PUCCH, PUSCH, and SRS). Therefore, the UE can be configured with explicitlist or unifiedTCI-StateRef-r17. If the UE is configured with explicitlist for upper-layer signaling ul-TCI-StateList-r17, the UE can use ul-TCI-ToAddModList-r17 to display the list of UL TCI states configured for use in the corresponding uplink bandwidth portion. If the UE is configured with unifiedTCI-StateRef-r17 (which provides a serving cell and a UL BWP, defining the UL TCI state applicable to this UL BWP. The value of unifiedTCI-StateType of the current serving cell is the same in the serving cell indicated by unifiedTCI-StateRef), for the upper-layer signaling ul-TCI-StateList-r17, the UE can use a joint TCI state or UL TCI state that can be used in the corresponding uplink bandwidth section by referring to a joint TCI state or UL TCI state configured in another uplink bandwidth section, without explicitly configuring it in the corresponding uplink bandwidth section. In this case, the upper-layer signaling unifiedTCI-StateRef-r17 can represent an index of any bandwidth section within any serving cell. Furthermore, the UE may expect serving cells that include bandwidth sections configured with unifiedTCI-StateRef-r17 and any serving cells that include bandwidth sections that can be configured from the base station via unifiedTCI-StateRef-r17 to have the same unifiedTCI-StateType.

[0546] As shown in Table 25, if the UE is configured with unifiedTCI-StateType, the UE can be configured with upper-layer signaling ul-powerControl, and ul-powerControl can point to an Uplink-powerControlId-r17 (when the UE is configured with unifiedTCI-StateType of the serving cell, ul-powerControl configures power control parameters for PUCCH, PUSCH, and SRS. For each serving cell, ul-powerControl is either configured in all BWP-UplinkDedicated or not configured in any BWP-UplinkDedicated. When the unifiedTCI-StateRef in the BWP-UplinkDedicated or PDSCH-Config of a serving cell (if unifiedTCI-StateType is set to union) points to another serving cell, ul-powerControl is either configured in all BWP-UplinkDedicated of both serving cells or in any BWP-UplinkDedicated of both serving cells). In this case, the UE can configure upper-layer signaling ul-powerControl for all uplink bandwidth portions within a specific serving cell, or it can choose not to configure upper-layer signaling ul-powerControl for all uplink bandwidth portions. If the UE configures unifiedTCI-StateRef-r17 in BWP-UplinkDedicated, or receives a configuration of unifiedTCI-StateRef-r17 value referencing another serving cell and bandwidth portion in PDSCH-Config, and unifiedTCI-StateType is configured as federated, then the UE can expect ul-powerControl to be configured in all uplink bandwidth portions within the referenced serving cell and the corresponding serving cell, or not configured in all uplink bandwidth portions within the referenced serving cell and the corresponding serving cell. In this case, upper-layer signaling ul-powerControl can be configured for the UE only if a condition called NoTCI-PC is met, and the meaning of the condition called NoTCI-PC can indicate that upper-layer signaling ul-powerControl is not configured in the federated TCI state or UL TCI state in the corresponding serving cell.

[0547] As shown in Table 25, if the UE is configured with unifiedTCI-StateType, the UE can configure the upper-layer signaling pathlossReferenceRSToAddModList-r17. pathlossReferenceRSToAddModList-r17 can represent a list of reference signals (e.g., CSI-RS configuration or SS block) that can be used to calculate path loss when transmitting PUSCH, PUCCH, or SRS, provided the UE supports unified TCI state. If unifiedTCI-StateType is not configured in the corresponding serving cell, the list may not be included in the upper-layer signaling.

[0548] If the UE is configured with unifiedTCI-StateType, and if the UE is indicated with a reference signal for path loss measurement via TCI state indication, then the indicated reference signal for path loss measurement can represent the reference signal for path loss measurement configured in the serving cell where the indicated TCI state is applied. In this case, if the UE is configured with pathlossReferenceLinking, the UE can assume that the indicated reference signal for path loss measurement refers to the reference signal for path loss measurement configured in the serving cell via pathlossReferenceLinking.

[0549] If the UE operates based on a unified TCI state, i.e., depending on whether the unified or individual upper-layer signaling unifiedTCI-StateType is configured, the upper-layer signaling structure from which the UE's TCI state can be determined from the base station. If the UE is configured with the unified upper-layer signaling unifiedTCI-StateType, the UE's unified TCI state can be configured and indicated from the base station using the upper-layer signaling structure shown in Table 26 below. If the UE is configured with the individual upper-layer signaling unifiedTCI-StateType, the UE can configure and indicate the DL TCI state from the base station using the upper-layer signaling structure shown in Table 26 below, and can configure and indicate the UL TCI state from the base station using the upper-layer signaling structure shown in Table 27.

[0550] If the UE is configured with the unified upper-layer signaling unifiedTCI-StateType, the UE can expect that pathlossReferenceRS-Id-r17 in Table 26 will always be configured, and can expect that ppathlossReferenceRS-Id-r17 will not be configured when unifiedTCI-StateType is configured alone or not configured, and the name of this condition can be defined as JointTCI1.

[0551] If the UE is configured with a separate upper-layer signaling unifiedTCI-StateType, the UE can expect pathlossReferenceRS-Id-r17 in Table 27 to always be configured, and the name of this condition can be defined as Mandatory.

[0552] Table 26

[0553]

[0554] Table 27

[0555]

[0556] The UE can configure upper-layer signaling related to the transmit power parameters applicable to SRS transmission according to Tables 28 and 29. Table 28 shows the SRS configuration (SRS-Config), and Table 29 shows the SRS resource set configuration (SRS-Resourceset).

[0557] Table 28

[0558]

[0559] Table 29

[0560]

[0561]

[0562] The descriptions of each upper-layer signaling parameter in Tables 28 and 29 can be as follows.

[0563] - tpc-Accumulation: If the UE is not configured with tpc-Accumulation, when it receives a TPC command indicating a change in SRS transmission power, the UE can perform an additional accumulation operation on the value of the previously indicated TPC command. If the UE is configured to disable tpc-Accumulation, the UE can perform an absolute TPC operation without performing an accumulation operation when it receives a TPC command indicating a change in SRS transmission power. This absolute TPC operation is possible when the SRS does not share a closed-loop index with the PUSCH.

[0564] -α: The UE can be configured with an α value for determining the SRS transmit power via the corresponding upper-layer signaling.

[0565] - p0: The UE can be configured with the p0 value in SRS-resourceSet, which is used to determine the SRS transmit power through the corresponding upper-layer signaling. If the UE is not configured with the upper-layer signaling unifiedTCI-StateType, the UE can determine the value in Equation 10 through the corresponding upper-layer signaling p0. Value. If the UE is configured with the upper-layer signaling unifiedTCI-StateType, the UE can use the value in Equation 10. The value is determined as the sum of p0 in the corresponding upper-layer signaling SRS-resourceSet and the possible p0 values ​​configured in Uplink-powerControlId-r17's p0AlphaSetforSRS (e.g., In this case, Uplink-powerControlId-r17 can be determined using the following method.

[0566] ■ If the UE determines the uplink transmit power using [Method 1-1], it can be determined by an ul-powerControl configured within a specific uplink bandwidth portion.

[0567] ■ If the UE determines the uplink transmit power using [Method 1-2],

[0568] If the UE is configured with upper-layer signaling followUnifiedTCIstateSRS in the SRS resource set, the UE can receive upper-layer signaling p0AlphaSetforSRS based on the TCIState or UL-TCIstate indicated by the base station. The values ​​of α and srs-PowerControlAdjustmentStates are used, and the upper-layer signaling pathlossReferenceRS, which represents the path loss reference signal, is received based on the upper-layer signaling pathlossReferenceRS-Id-r17 associated with or contained in the TCIState or UL-TCIstate indicated by the base station.

[0569] If the UE does not have upper-layer signaling configured in the SRS resource set as followUnifiedTCIstateSRS, the UE can receive upper-layer signaling p0AlphaSetforSRS based on the TCIState or UL-TCIstate configured in the SRS resource with the lowest index in the SRS resource set. The values ​​of α and srs-PowerControlAdjustmentStates are used, and the upper-layer signaling pathlossReferenceRS, representing the path loss reference signal, is received based on the upper-layer signaling pathlossReferenceRS-Id-r17 associated with or contained in the TCIState or UL-TCIstate configured in the SRS resource with the lowest index in the corresponding SRS resource set.

[0570] - srs-PowerControlAdjustmentStates: The UE can be configured with a closed-loop index, which is used to determine the SRS transmit power via the corresponding upper-layer signaling. If the UE does not configure the corresponding upper-layer signaling, the UE can share the SRS closed-loop index with the first closed-loop index of the PUSCH. If the UE is configured with the corresponding upper-layer signaling as sameAsFci2, the UE can share the SRS closed-loop index with the second closed-loop index of the PUSCH. In this case, the UE can be configured with upper-layer signaling, allowing the UE to have up to two closed-loop indices for the PUSCH. If the UE is configured with the corresponding upper-layer signaling as separateClosedLoop, the UE can configure the SRS closed-loop index separately without sharing it with the PUSCH closed-loop index.

[0571] ■ If the UE configures the upper-layer signaling unifiedTCI-StateType and configures srs-PowerControlAdjustmentStates as separateClosedLoop in a specific SRS resource set, the UE can assume that the SRS resources included in that SRS resource set are connected to the PUSCH and a separate closed-loop index. In this case, the UE can consider the PUSCH and the separate closed-loop index as described above, regardless of the closed loop connected to the TCI state indicated by the base station.

[0572] ■ If the UE configures the upper-layer signaling unifiedTCI-StateType but does not configure srs-PowerControlAdjustmentStates as separateClosedLoop in a specific SRS resource set (i.e., if srs-PowerControlAdjustmentStates is not configured or sameAsFci2 is configured), the UE can assume that the SRS resources included in the SRS resource set are connected to the first or second closed-loop index connected to the PUSCH. In this case, if the closed loop connected to the TCI state indicated by the base station is i0, the UE can assume that the SRS resources are connected to the first closed-loop index connected to the PUSCH when determining the transmit power of the SRS with the applicable TCI state. If the closed loop is i1, the UE can assume that the SRS resources are connected to the second closed-loop index connected to the PUSCH when determining the transmit power of the SRS with the applicable TCI state.

[0573] - pathlossReferenceRSList: The UE can be configured with a list of reference signals that can measure path loss, which is used to determine the transmission power of SRS through the corresponding upper-layer signaling.

[0574] - followUnifiedTCI-StateSRS-r17: When the UE operates in UnifiedTCI State, i.e., when the UE is configured with unifiedTCI-StateType, the UE can determine through the corresponding upper-layer signaling whether the joint TCI state or UL TCI state indicated to the UE via DCI can be applied to the SRS resources in the corresponding SRS resource set. If the corresponding upper-layer signaling is configured to be enabled, the UE can apply the joint TCI state or UL TCI state indicated via DCI to the SRS resources in the corresponding SRS resource set. If the UE is not configured with the corresponding upper-layer signaling, the UE can configure the joint TCI state or UL TCI state for each SRS resource in the corresponding SRS resource set, and can choose not to apply the joint TCI state or UL TCI state indicated via DCI to the SRS resources in the corresponding SRS resource set. If the purpose of the SRS resource set is configured for beam management and the resourceType is aperiodic, and if the purpose of the SRS resource set is set to codebook, non-codebook, and antenna switching, and the resourceType is aperiodic, semi-persistent, and periodic, the UE can configure the corresponding upper-layer signaling.

[0575] - applyIndicatedTCI-State-r18: When the UE operates in a unified TCI state, i.e., when the UE is configured with unifiedTCI-StateType and operates as multiple TRPs, the UE can configure which TCI state to apply the SRS resources in the SRS resource set configured with the corresponding upper-layer signaling through the corresponding upper-layer signaling. If the UE is configured with followUnifiedTCI-StateSRS-r17, the UE may not be configured with applyIndicatedTCI-State-r18. If the purpose of the SRS resource set is configured for beam management and the resourceType is aperiodic, or if the purpose of the SRS resource set is set to codebook, non-codebook, and antenna switching and the resourceType is aperiodic, semi-persistent, and periodic, then the UE can configure the corresponding upper-layer signaling in the SRS resource set.

[0576] ■ If the UE operates as multiple TRPs based on a single DCI, i.e., when the UE configures two joint TCI states, two DL TCI states, or two UL TCI states in at least one code point of the TCI state field in the DCI, if the UE configures a first corresponding upper-layer signaling, the UE can apply the first joint TCI state or the first UL TCI state to one or more SRS resources in the SRS resource set, wherein the corresponding upper-layer signaling is configured between one or more joint TCI states or one or more UL TCI states indicated to the UE via the DCI. If the UE configures a second corresponding upper-layer signaling, the UE can apply the second joint TCI state or the second UL TCI state to one or more SRS resources in the SRS resource set, wherein the corresponding upper-layer signaling is configured between one or more joint TCI states or one or more UL TCI states indicated to the UE via the DCI. If the UE does not configure the corresponding upper-layer signaling, the UE can configure a joint TCI state or UL TCI state for each of one or more SRS resources in the corresponding SRS resource set, and may not apply the joint TCI state or UL TCI state indicated via the DCI to the SRS resources within the corresponding SRS resource set.

[0577] ■ If the UE operates as multiple TRPs based on multiple DCIs, i.e., when the UE is configured with two different CORESETPoolIndexes, and when the corresponding upper-layer signaling is configured as either first or second, the UE can apply the joint TCI state or UL TCI state indicated by the DCI received in the CORESET with CORESETPoolIndex configured as 0 or 1 to one or more SRS resources in the SRS resource set configured with the corresponding upper-layer signaling. If two different values ​​are configured in the coresetPoolIndex field of the BWP's controlResourceSet IE, the value "first" of the applyIndicatedTCI-State field can correspond to the joint / UL TCI state indicated by the coresetPoolIndex value of 0, while the value "second" of the above field can correspond to the joint / UL TCI state indicated by the coresetPoolIndex value of 1. If the UE has not configured the corresponding upper-layer signaling and a resource set configured as aperiodic SRS is triggered by a DCI, the UE can determine the joint TCI state or UL TCI state to apply based on which CORESET with a configured CORESETPoolIndex received the corresponding DCI from one or more SRS resources in the corresponding SRS resource set. For example, if the UE has configured followUnifiedTCI-StateSRS-r17 and the resource set configured as aperiodic SRS is triggered by a DCI received within a CORESET with a CORESETPoolIndex configured to 0, the UE can apply the joint TCI state or UL TCI state indicated by the DCI received within a CORESET with a CORESETPoolIndex configured to 0 to one or more SRS resources in the SRS resource set. As another example, if the UE is not configured with the corresponding upper-layer signaling, and if the resource type is configured as an aperiodic SRS resource set triggered by a DCI received within a CORESET with CORESETPoolIndex configured to 1, the UE can apply a combined TCI state or UL TCI state indicated by a DCI received within a CORESET with CORESETPoolIndex configured to 1 to one or more SRS resources in the SRS resource set.For example, if the UE is not configured with the corresponding upper-layer signaling and if the UE is not configured with followUnifiedTCI-StateSRS-r17, the UE can configure a joint TCI state or UL TCI state for each of one or more SRS resources in the corresponding SRS resource set, and can not apply the joint TCI state or UL TCI state indicated by DCI to the SRS resources in the corresponding SRS resource set.

[0578] Considering the structure of the aforementioned upper-layer signaling, the UE can use two methods to determine the uplink transmit power when operating in the unified TCI state.

[0579] [Method 1-1] Basic Transmit Power Determination Method: Applying Common Transmit Power Parameters

[0580] The UE can configure ul-powerControl parameters for each of one or more uplink bandwidth portions configured within a specific serving cell. In other words, the UE can apply a set of transmit power parameters (e.g., p0, α, closed-loop index) to all uplink transmissions within each uplink bandwidth portion, and these parameters can be obtained through the ul-powerControl configured in that uplink bandwidth portion. Therefore, the UE can use only a common set of transmit power parameters based on the uplink channel and signaling, instead of using individual transmit power parameters.

[0581] [Method 1-2] Additional methods for determining transmit power: Different transmit power parameters can be applied.

[0582] The UE may not have configured ul-powerControl parameters for each of the one or more uplink bandwidth portions configured within a specific serving cell, and may apply a set of transmit power parameters (e.g., p0, α, closed-loop index) in a joint TCI state or UL TCI state. These parameters can be obtained through the upper-layer signaling ul-powerControl-r17, as shown in Table 26 or Table 27. Therefore, the UE can configure different joint TCI states or different ul-powerControl-r17s for each UL TCI state. Thus, compared to [Method 1-1], various transmit power parameters can be operated, and different transmit power parameters can be used depending on the uplink transmission situation and the operating scenarios of the UE and the base station.

[0583] Similar to [Method 1-1] and [Method 1-2] described above, the UE can be configured with reference signals for path loss measurement in either the Joint TCI state or the UL TCI state. That is, as stated above, if the UE operates in the Unified TCI state, the UE can always be configured with reference signals for path loss measurement in either the Joint TCI state or the UL TCI state, and the UE can determine the path loss to be reflected when determining the uplink transmit power by using the reference signals configured for path loss measurement in the configured and indicated Unified TCI state. Furthermore, the UE can track up to four reference signals for path loss measurement for each arbitrary serving cell and update up to four different path losses.

[0584] The UE can send a UE capability report indicating whether it supports at least one combination of [Method 1-1] and [Method 1-2]. Furthermore, the UE can configure at least one combination of [Method 1-1] and [Method 1-2] from the base station via upper-layer signaling.

[0585] <Second Embodiment: Method for Calculating Path Loss Offset Between UE and Base Station>

[0586] As an embodiment of this disclosure, a method for calculating the path loss offset between a UE and a base station is described. This embodiment can be operated in conjunction with another embodiment.

[0587] Figure 13 This is a diagram illustrating a base station and a UE as examples of multiple TRP operations according to embodiments of the present disclosure, including a TRP that only supports uplink reception.

[0588] Reference Figure 13 UE 13-10 can connect to and operate with base station 13-15, which operates as multiple TRPs as described above. Essentially, the UE can assume that each of the multiple TRPs supports both uplink reception and downlink transmission. In this case, in addition to the conventional TRP 13-00 (e.g., TRP1) that supports both uplink reception and downlink transmission, the base station can also operate a TRP 13-05 (e.g., TRP2) that only supports uplink reception, with the aim of improving uplink coverage from the UE's perspective, or to achieve energy savings by conserving downlink transmission power. Such a TRP that only supports uplink reception can be referred to as a UL-only TRP. The UE can assume that downlink transmission does not originate from this UL-only TRP. In this case, as an assumption for such a UL-only TRP, the base station and the UE can consider at least one of the following combinations.

[0589] - The corresponding UL-only TRP can operate as a UL-only TRP for a specific UE only. That is, the corresponding UL-only TRP has both uplink receive and downlink transmit capabilities, but can support only the uplink receive function of a specific UE under certain conditions (e.g., notifying the UE that it is connected to the UL-only TRP via at least one combination of specific upper-layer signaling, MAC-CE, and L1 signaling). That is, downlink transmit can be supported to other UEs. When a specific UE is located at the boundary of any cell coverage area, the UL-only TRP can extend the uplink coverage by additionally operating only the receive function of TRPs that are already installed or newly installed near that location.

[0590] - Alternatively, the corresponding UL-only TRP may not support downlink transmission for all UEs, but only uplink reception. In other words, the corresponding UL-only TRP is a TRP with relatively low production and installation costs, and in addition to existing TRPs, it can also be used to receive uplink transmissions from UEs, thereby obtaining receive diversity from the base station's perspective.

[0591] The UE can receive path loss measurement reference signals from TRP 13-00, which is capable of both uplink and downlink operation. However, since downlink transmission is not performed from UL-only TRP 13-05, a problem may exist where the path loss between the UL-only TRP and the UE is unknown when the UE13-10 performs uplink transmission to UL-only TRP 13-05. To address this, the base station and the UE can consider a combination of at least one of the following methods to obtain path loss information between the UL-only TRP and the UE.

[0592] [Method 2-1]

[0593] Figure 14 This is a diagram illustrating a method for calculating and updating path loss offset according to an embodiment of the present disclosure.

[0594] Reference Figure 14 UE 14-00 can operate by connecting to a base station consisting of a TRP capable of both uplink and downlink operation (e.g., TRP1 14-05) and a UL-only TRP capable only of uplink reception (e.g., TRP2 14-10). UE 14-00 and the base station can undergo a series of processes to exchange signals between UE 14-00 and the base station to obtain information about the path loss between TRP2 14-10 and UE 14-00.

[0595] [Process 2-1] UE uplink transmission

[0596] UE 14-00 can transmit uplink signals to TRP1 14-05 and TRP2 14-10 (14-15). In this case, if the UE operates in FR1, it can transmit uplink signals to TRP1 14-05 and TRP2 14-10 via a single uplink transmission. If the UE operates in FR-2, it can perform separate uplink transmissions by applying different transmit beams to TRP1 14-05 and TRP2 14-10. If the UE operates in FR2, it can apply the same transmit power parameters (14-20) when determining the transmit power of each uplink signal sent to TRP1 14-05 and TRP2 14-10. That is, when determining the transmit power of the two uplink signals, the UE can consider the same p0, α, closed-loop index, and path loss between TRP1 14-05 and the UE. Therefore, even if the transmit power of the uplink signal sent by the UE to TRP2 14-10 is the transmit power, the UE can still apply the path loss (14-10) between TRP1 14-05 and the UE when determining the transmit power of TRP2.

[0597] [Procedure 2-2] Calculate the path loss offset at the base station

[0598] Then, TRP1 14-05 and TRP2 14-10 can receive the uplink transmissions from the UE, and calculate the received power P1 14-30 and P2 14-25 at each TRP. TRP2 14-10 can send P2 (14-35) to TRP1 14-05. TRP1 14-05, which receives P2 from TRP2 14-10, can calculate d_P, which is the difference between P1 and P2 (14-40). In this case, when calculating d_P in TRP1 14-05 (14-40), TRP1 14-05 can take into account the receive beam gain at TRP1 14-05, the receive beam gain at TRP2 14-10, and the maximum allowable exposure (MPE) value, which can determine the transmit beam gain and transmit power reduction of each transmit beam when the UE transmits to TRP1 14-05 and TRP2 14-10 in the case of FR2.

[0599] [Process 2-3] Send path loss offset to UE

[0600] The base station can calculate the path loss offset d_P, which is the difference between the path loss between TRP1 14-05 and the UE and the path loss between TRP2 14-10 and the UE, and then inform the UE of this value (14-45). Through this process, the UE can obtain the d_P value (14-50). Then, when transmitting uplink for TRP2 14-10, in addition to the path loss that can be measured by the reference signal received from TRP1 14-05 for path loss measurement, the d_P value can also be applied to determine the uplink transmission power of TRP2 14-10.

[0601] Through [Process 2-1] to [Process 2-3], the base station can calculate d_P using the received power information of the UE's uplink signal. This d_P is the difference between the path loss between TRP1 and the UE and the path loss between TRP2 and the UE. In [Process 2-3], the base station can process one or more d_P values ​​calculated by repeating [Process 2-1] and [Process 2-2] once or more (e.g., taking the arithmetic mean) and send these values ​​to the UE.

[0602] Meanwhile, when the UE is not fixed to a specific location (such as a Client Premises Equipment (CPE)), UEs such as smartphones, smartwatches, and tablets can be mobile without a fixed location, so d_P may be a value that varies over time. Therefore, [Processes 2-1] to [Processes 2-3] can be configured or activated to repeat periodically or semi-continuously for the UE, or they can be triggered non-periodically for the UE. To identify the changing d_P value and send it to the UE, the following additional procedures can be considered between the UE and the base station.

[0603] [Process 2-4] Uplink transmission after UE obtains d_P

[0604] After obtaining d_P from the base station, UE 14-00 can transmit uplink signals to TRP1 14-05 and TRP2 14-10 (14-55). In this case, if the UE operates in FR1, it can transmit uplink signals to TRP1 14-05 and TRP2 14-10 via a single uplink transmission. If the UE operates in FR-2, it can perform separate uplink transmissions by applying different transmit beams to TRP1 14-05 and TRP2 14-10. If the UE operates in FR2, it can apply the same transmit power parameters (14-60) when determining the transmit power of each uplink signal sent to TRP1 14-05 and TRP2 14-10. That is, when determining the transmit power of the two uplink signals, the UE can consider the same p0, α, closed-loop index, and path loss between TRP1 14-05 and the UE. Furthermore, although the UE obtains the d_P value through the above [process 2-3], the UE can transmit without applying d_P when determining the uplink transmission power to TRP2 14-10. This allows the base station to calculate the difference (14-60) between the path loss between TRP1 14-05 and the UE and the path loss between TRP2 14-10 and the UE by applying the same transmission power parameter to both TRPs. Therefore, even if the transmission power of the uplink signal sent by the UE to TRP2 14-10 is the transmission power, the UE can still apply the path loss between TRP1 14-05 and the UE when determining the corresponding transmission power.

[0605] [Procedure 2-5] Calculate the path loss offset at the base station

[0606] Then, TRP1 14-05 and TRP2 14-10 can receive the UE's uplink transmission in [Procedure 2-4] respectively, and calculate the received power P1' 14-70 and P2' 14-65 at each TRP. TRP2 14-10 can send P2' (14-75) to TRP1 14-05. TRP1 14-05, which receives P2' from TRP2 14-10, can calculate d_P', which is the difference between P1' and P2' (14-80). In this case, when calculating d_P' (14-80) in TRP1 14-05, TRP1 14-05 can take into account the receive beam gain at TRP1 14-05, the receive beam gain at TRP2 14-10, and the maximum allowable exposure (MPE) value, which can determine the transmit beam gain and transmit power reduction of each transmit beam when the UE transmits to TRP1 14-05 and TRP2 14-10 in the case of FR2.

[0607] [Process 2-6] Send path loss offset to UE

[0608] The base station can calculate d_P', which is the path loss offset between TRP1 14-05 and the UE, and the path loss between TRP2 14-10 and the UE, and then inform the UE of this value (14-85). Through this process, the UE can obtain an updated d_P' value (14-90) compared to the previously obtained d_P value. Then, when transmitting uplink for TRP2 14-10, in addition to the path loss that can be measured by the reference signal received from TRP1 14-05 for path loss measurement, the d_P' value can also be applied to determine the uplink transmission power of TRP2 14-10.

[0609] Afterwards, the UE and the base station can repeat [Process 2-4] through [Process 2-6] to calculate and share the updated value of d_P. In [Process 2-6], the base station can process (e.g., take the arithmetic mean) one or more d_P' values ​​calculated by repeating [Process 2-4] and [Process 2-5] once or more, and send the value of d_P' to the UE.

[0610] If the UE performs uplink transmission as shown in [Procedure 2-1] and [Procedure 2-4], the UE can configure one or more SRS resources in the SRS resource set, where the upper-layer signaling resource type is configured as periodic, semi-persistent, or aperiodic, to perform [Procedure 2-1] and [Procedure 2-4] based on SRS transmission, and all such one or more SRS resources can have the same transmit power parameters. If the UE operates in FR1, the UE can apply the same transmit power parameters (e.g., p0, α, closed-loop index, and path loss) to TRP1 14-05 and TRP2 14-10 based on one SRS resource in the corresponding SRS resource set, and even if this is an uplink transmission of TRP2 14-0, the path loss offset may not be applied when determining the transmit power as described above. If the UE operates in FR2, the UE can apply the same transmit power parameters (e.g., p0, α, closed-loop index, and path loss) to TRP1 14-05 and TRP2 14-10 based on one or more SRS resources in the corresponding SRS resource set, and can apply different transmit beams to each SRS resource. Similarly, even if this is an uplink transmit of TRP2 14-10, the UE may not apply path loss offset when determining the transmit power as described above.

[0611] The UE can perform the uplink transmissions shown in [Procedure 2-1] and [Procedure 2-4] via uplink channels and signals other than SRS (such as PUCCH, PUSCH, Physical Random Access Channel (PRACH)).

[0612] When the UE performs the uplink transmissions shown in [Process 2-1] and [Process 2-4], it is necessary to apply the same transmit power parameters to the uplink channels or signals transmitted to TRP1 14-05 and TRP2 14-10 in each process. However, different transmit power parameters can also be used between processes (e.g., the transmit power parameters used in [Process 2-1] and the transmit power parameters used in [Process 2-4]). For example, if the UE determines the uplink transmit power in [Process 2-1] by using the first p0, the first α, the first closed-loop index, and the first path loss, and transmits it to TRP1 14-05 and TRP2 14-10, then the UE can determine the uplink transmit power in [Process 2-4] by using the second p0, the second α, the second closed-loop index, and the second path loss, and transmit it to TRP1 14-05 and TRP2 14-10. In this case, the first p0 and the second p0 can be the same or different, and a similar relationship can be established for other transmit power parameters.

[0613] In the case of [Method 2-1], the UE can receive the d_P value from the base station through [Procedure 2-3] and [Procedure 2-6]. In the case of [Method 2-1], since the UE receives the d_P value from the base station, when considering the same amount of quantization bits, the UE may receive an inaccurate value compared to the received d_P value that might be considered in [Method 2-2] below. However, as mentioned above, since there is no constraint that the same transmit power parameter must be used between each transmission time point as in [Procedure 2-1] and [Procedure 2-4], the base station can flexibly operate this uplink transmission.

[0614] [Method 2-2]

[0615] Figure 15 This is a diagram illustrating another method for calculating and updating path loss offset according to an embodiment of the present disclosure.

[0616] Reference Figure 15 UE 15-00 can operate by connecting to a base station consisting of a TRP capable of both uplink and downlink operation (e.g., TRP1 15-05) and a UL-only TRP capable only of uplink reception (e.g., TRP2 15-10). UE 15-00 and the base station can undergo a series of processes to exchange signals between UE 15-00 and the base station to obtain information about the path loss between TRP2 15-10 and UE 15-00.

[0617] [Process 3-1] UE uplink transmission

[0618] UE 15-00 can transmit uplink signals (15-15) to TRP1 15-05 and TRP2 15-10. In this case, if the UE operates in FR1, it can transmit uplink signals to both TRP1 15-05 and TRP2 15-10 via a single uplink transmission. If the UE operates in FR-2, it can perform separate uplink transmissions by applying different transmit beams to TRP1 15-05 and TRP2 15-10. If the UE operates in FR2, it can apply the same transmit power parameters (15-20) when determining the transmit power of each uplink signal sent to TRP1 15-05 and TRP2 15-10. That is, when determining the transmit power of the two uplink signals, the UE can consider the same p0, α, closed-loop index, and path loss between TRP1 15-05 and the UE. Therefore, even if the transmit power of the uplink signal sent by the UE to TRP2 15-10 is the transmit power, the UE can still apply the path loss between TRP1 15-05 and the UE when determining the corresponding transmit power.

[0619] [Procedure 3-2] Calculate the path loss offset at the base station

[0620] Then, TRP1 15-05 and TRP2 15-10 can receive the uplink transmissions from the UE, and calculate the received power P1 15-30 and P2 15-25 at each TRP. TRP2 15-10 can send P2 (15-35) to TRP1 15-05. TRP1 15-05, which receives P2 from TRP2 15-10, can calculate d_P, which is the difference between P1 and P2 (15-40). In this case, when calculating d_P in TRP1 15-05 (15-40), TRP1 15-05 can take into account the receive beam gain at TRP1 15-05, the receive beam gain at TRP2 15-10, and the maximum allowable exposure (MPE) value, which can determine the transmit beam gain and transmit power reduction of each transmit beam when the UE transmits to TRP1 15-05 and TRP2 15-10 in the case of FR2.

[0621] [Process 3-3] Send path loss offset to UE

[0622] The base station can calculate the path loss offset d_P, which is the difference between the path loss between TRP1 15-05 and the UE and the path loss between TRP2 15-10 and the UE, and then notify the UE of this value (15-45). Through this process, the UE can obtain the d_P value (15-50). Then, when transmitting uplink for TRP2 15-10, in addition to the path loss that can be measured by the reference signal received from TRP1 15-05 for path loss measurement, the d_P value can also be applied to determine the uplink transmission power of TRP2 15-10.

[0623] Through [Processes 3-1] to [Processes 3-3], the base station can calculate d_P using the received power information of the UE's uplink signal. d_P is the difference between the path loss between TRP1 and the UE and the path loss between TRP2 and the UE. In [Process 3-3], the base station can process one or more d_P values ​​calculated by repeating [Processes 3-1] and [Processes 3-2] once or more (e.g., taking the arithmetic mean) and send these values ​​to the UE. Furthermore, in [Process 3-3], the base station can initially perform a single notification of the d_P value to the UE at the base station, and subsequently, the base station can optionally perform [Process 3-3] when the UE and the base station repeat [Processes 3-1] and [Processes 3-2].

[0624] Meanwhile, when the UE is not fixed to a specific location (such as a Client Premises Equipment (CPE)), UEs such as smartphones, smartwatches, and tablets can be mobile without a fixed location, so d_P may be a value that varies over time. Therefore, [Processes 3-1] to [Processes 3-3] can be configured or activated to repeat periodically or semi-continuously for the UE, or can be triggered non-periodically for the UE. In this case, if [Processes 2-4] to [Processes 2-6] are the method by which the UE and the base station update the d_P value and share it with each other, then the following [Processes 3-4] to [Processes 3-6] could be a method in which the UE and the base station take the d_P value obtained through [Processes 3-1] to [Processes 3-3] as the initial value, calculate the change, and share it with each other. In order to identify the change in the d_P value in this way and send it to the UE, the following additional process can be considered between the UE and the base station.

[0625] [Process 3-4] Uplink transmission after UE obtains d_P

[0626] After obtaining d_P from the base station, UE 15-00 can transmit an uplink signal (15-55) to TRP2 15-10. In this case, the UE can use the p0, α, and closed-loop index from the transmit power parameters used in [Procedure 3-1], and in the case of path loss, the d_P value obtained in [Procedure 3-3] can be applied to the path loss amount between TRP1 15-05 and UE 15-60 to use path loss (15-60). If the UE is operating in FR2, the UE can use the same or different transmit beams used in [Procedure 3-1] and [Procedure 3-4]. If the UE uses the same transmit beam in [Process 3-1] and [Process 3-4], then when calculating the change of d_P in subsequent processes, it is not necessary to compensate for the difference in transmit beam gain value caused by the change of transmit beam at the UE. However, if no compensation is made (i.e. when the UE uses different transmit beams in [Process 3-1] and [Process 3-4]), the base station can improve the accuracy of calculating the change of d_P value by compensating for the difference in transmit beam gain for each transmit beam in subsequent processes.

[0627] [Procedure 3-5] Calculate the path loss offset at the base station

[0628] Then, TRP2 15-10 can receive the UE's uplink transmission in [Procedure 3-4] and calculate the received power P2" 15-65. TRP2 15-10 can compare the value obtained by subtracting the d_P value from P2 calculated in [Procedure 3-2] (e.g., P2-d_P) with the P2" value. In this case, since P2 is a received power value calculated based on the transmit power parameters without considering path loss offset, while P2" is a received power value calculated by applying the path loss offset to the same transmit power parameters as when calculating P2, comparing the value obtained by subtracting d_P from P2 with P2" is equivalent to estimating the change in the d_P value. In this way, TRP2 15-10 can calculate d_P", which is the change in the d_P value (15-70). In this case, when calculating d_P" in TRP2 15-10 (15-70), TRP2 15-10 can consider the receive beam gain at TRP2 15-10, the transmit beam gain considered by the UE when transmitting to TRP2 15-10 in the case of FR2, and the maximum allowable exposure (MPE) value that can determine the amount of transmit power reduction for each transmit beam. TRP2 15-10 can then update the previously calculated d_P value by considering d_P" (15-71, e.g., d_P = d_P - d_P"). TRP2 15-10 can then send the d_P" value to TRP1 15-05 (15-75).

[0629] [Process 3-6] Send path loss offset to UE

[0630] The base station can calculate d_P", i.e., the change in d_P, which is the difference between the path loss offset between TRP1 15-05 and the UE and the path loss between TRP2 15-10 and the UE, and then notify the UE of the change in d_P (15-80). Through this process, the UE can obtain an updated d_P (15-85) compared to the previous value by applying the amount of d_P change from the previously acquired d_P value. Then, when transmitting uplink for TRP2 15-10, in addition to the path loss that can be measured by the reference signal received from TRP1 15-05 for path loss measurement, the UE can also determine the uplink transmission power of TRP2 (15-10) by applying the d_P value as the path loss offset and the d_P" value as the change in d_P.

[0631] Subsequently, the UE and the base station can repeat [Process 3-4] through [Process 3-6] to calculate and share the updated value of d_P. In [Process 3-6], the base station can process (e.g., take the arithmetic mean) one or more d_P' values ​​calculated by repeating [Process 3-4] and [Process 3-5] once or more, and send the d_P" value to the UE. Furthermore, TRP2 (15-10) can also update the d_P value after processing using one or more d_P" values ​​calculated by repeating [Process 3-4] and [Process 3-5] once or more.

[0632] When the UE performs an uplink transmission as shown in [Procedure 3-1], the UE can configure one or more SRS resources in the SRS resource set, where the upper-layer signaling resource type is configured as periodic, semi-persistent, or aperiodic, to perform uplink transmission based on SRS transmission, and all such one or more SRS resources can have the same transmit power parameters. If the UE operates in FR1, the UE can apply the same transmit power parameters (e.g., p0, α, closed-loop index, and path loss) to TRP1 15-05 and TRP2 15-10 based on one SRS resource in the corresponding SRS resource set, and even if this is an uplink transmission of TRP2 15-0, the path loss offset may not be applied when determining the transmit power as described above. If the UE operates in FR2, the UE can apply the same transmit power parameters (e.g., p0, α, closed-loop index, and path loss) to TRP1 15-05 and TRP2 15-10 based on one or more SRS resources in the corresponding SRS resource set, and can apply different transmit beams to each SRS resource. Similarly, even if this is an uplink transmission of TRP2 15-10, the UE may not apply path loss offset when determining the transmission power as described above.

[0633] When the UE performs uplink transmission as shown in [Procedure 3-4], the UE can configure one or more SRS resources in the SRS resource set, wherein the upper-layer signaling resource type is configured as periodic, semi-persistent or aperiodic, to perform uplink transmission based on SRS transmission, and all of these one or more SRS resources can have the same transmit power parameters.

[0634] If the UE performs both the uplink transmission in [Process 3-1] and the uplink transmission in [Process 3-4] using SRS resources in a SRS resource set configured as periodic or semi-persistent based on resource type, the UE can assume that the uplink transmission period in [Process 3-1] is longer than or equal to the uplink transmission period in [Process 3-4]. For example, if the uplink transmission period in [Process 3-1] is 10 time slots and the uplink transmission period in [Process 3-4] is 2 time slots, the UE does not need to consider the constraint that the transmission power parameters must be the same between each transmission time point of the uplink transmission in [Process 3-1]. Furthermore, as mentioned above, if the transmissions of TRP1 15-05 and TRP2 15-10 are performed separately within each transmission time point of the uplink transmission in [Process 3-1], the UE can consider that the transmission power parameters of the two TRPs are the same. Furthermore, in the case of uplink transmission in [Process 3-4], the UE can use the transmission power parameters used in the transmission period of the most recent uplink transmission in [Process 3-1] performed before the uplink transmission. For example, if the uplink transmission in [Process 3-1] is performed in slot n and the first transmission power parameter set is used at that time, then when the uplink transmission in [Process 3-1] is performed from the corresponding slot to the next period (slot n+10), the UE can use the first transmission power parameter set, and as mentioned above, the path loss offset can also be applied when performing the uplink transmission in [Process 3-4]. This is because, in [Process 3-4], when calculating d_P" in TRP2 15-10, the P2 value, i.e., the received power calculated through the previous uplink transmission, is taken into account. Therefore, there is a constraint that the transmission power parameters of the two uplink transmissions must be the same so that a more accurate d_P" value can be calculated.

[0635] The UE can also perform the uplink transmissions shown in [Procedure 3-1] and [Procedure 3-4] via uplink channels and signals other than SRS (such as PUCCH, PUSCH, PRACH).

[0636] In the case of [Method 2-2], the UE can initially receive the d_P value from the base station at least once via [Procedure 3-3], and can notify the d_P" value from the base station via [Procedure 3-6]. In the case of [Method 2-2], although the base station may need to send configuration messages for the UE for different uplinks in [Procedure 3-1] and [Procedure 3-4], which may increase signaling overhead, the UE can have the advantage of receiving a more accurate path loss offset value by receiving the d_P" value instead of the d_P value sent by the base station, given the same number of quantization bits.

[0637] Using the methods described above [Method 2-1] and [Method 2-2], the UE can use the following modified transmission power calculation equation when determining the uplink transmission power of UL TRP only.

[0638] For example, when determining the PUCCH transmit power for UL TRP-only operations that only support uplink receive, the UE can modify Equation 2 as shown in Equation 11, which will be used below. In this case, in Equation 11 below... This can be considered as the d_P value, i.e., the path loss offset, and This could mean that the corresponding path loss offset corresponds to one or more path loss measurement reference signals. In this case, if Corresponding to a path loss measurement reference signal, the UE can also consider .

[0639] [Equation 11]

[0640]

[0641] As another example, when determining the PUCCH transmit power for UL TRP-only operations that only support uplink receive operations, the UE can modify Equation 4 as shown in Equation 12 or Equation 13, which will be used below. In this case, in Equation 12 or Equation 13 below... It can be considered as the d_P value, i.e., the path loss offset, and This could mean that the corresponding path loss offset corresponds to one or more path loss measurement reference signals. In this case, if Corresponding to a path loss measurement reference signal, the UE can also consider It can be determined whether it will be used as a path loss offset value. Apply this directly to path loss to distinguish between Equation 12 or Equation 13 below.

[0642] [Equation 12]

[0643]

[0644] [Equation 13]

[0645]

[0646] As another example, when determining the PUCCH transmit power for UL TRP-only operations that only support uplink receive operations, the UE can modify Equation 7 as shown in Equation 14 or Equation 15, which will be used below. In this case, in Equation 14 or Equation 15 below... It can be considered as the d_P value, i.e., the path loss offset, and This could mean that the corresponding path loss offset corresponds to one or more path loss measurement reference signals. In this case, if Corresponding to a path loss measurement reference signal, the UE can also consider It can be determined whether it will be used as a path loss offset value. Apply this directly to path loss to distinguish between Equation 14 or Equation 15 below.

[0647] [Equation 14]

[0648]

[0649] [Equation 15]

[0650]

[0651] The UE may expect to be notified by the base station of at least one combination of [Method 2-1] and [Method 2-2] via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling, or at least one combination of [Method 2-1] and [Method 2-2] may be fixedly defined in the standard. Furthermore, if the base station notifies the UE of at least one combination of a particular method via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling, this may mean that the UE cannot support at least one other combination of that particular method. For example, the UE may expect [Method 2-1] or [Method 2-2] to be fixedly defined in the standard for methods used to obtain and update path loss offsets. As another example, [Method 2-1] may be notified to the UE by the base station via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling; in this case, the UE may consider that the base station is notifying it that it does not support [Method 2-2].

[0652] The UE can report to the base station whether it supports at least one combination of [Method 2-1] and [Method 2-2] as a UE capability. In this case, if the UE reports to the base station that a combination of one or more specific methods is supported as a UE capability, it can be assumed that the UE has reported that it cannot support one or more other combinations of methods. For example, the UE can report to the base station whether it supports [Method 2-1] or [Method 2-2]. As another example, the UE can report to the base station that it supports [Method 2-1], and this UE capability report may imply that the UE cannot support [Method 2-2].

[0653] <Third Embodiment: Method for Updating Path Loss Offset Between UE and Base Station>

[0654] As one embodiment of this disclosure, a method for updating the path loss offset between a UE and a base station is described. This embodiment can be operated in conjunction with another embodiment.

[0655] In steps 2-3 and 2-6 of [Method 2-1] and step 3-3 of [Method 2-2], the UE can receive a d_P value from the base station. This d_P value is the difference between the path loss between the TRP and the UE that can perform both uplink and downlink operations and the path loss between the TRP and the UE that can only perform uplink reception operations. Furthermore, in step 3-6 of [Method 2-2], the UE can receive a d_P" value from the base station, i.e., the change in d_P. In this case, the d_P value or d_P" value can be any integer in dB. For example, the UE can assume that the distance between the TRP that can perform both uplink and downlink operations and the UE is shorter than the distance between the TRP that can only perform uplink reception operations and the UE, and based on this, the d_P value can only be a value less than or equal to 0, and the d_P" value can be an integer. The UE can consider at least one combination of the following as a method for receiving path loss offset or path loss change from the base station.

[0656] [Method 3-1]

[0657] The UE can configure the d_P value (path loss offset) or the d_P" value (change in d_P value) from the base station via upper-layer signaling. In this case, the UE can configure one or more d_P values ​​(path loss offset) or the d_P" value (change in d_P value for each bandwidth segment or cell) via upper-layer signaling. For example, the UE can be configured with either a d_P value or a d_P" value of 4, which represents the maximum number of path loss measurement reference signals that the UE can track within a specific cell via upper-layer signaling. Since the UE may only receive the d_P value as a path loss offset or the d_P" value as a change in d_P value from the base station via upper-layer signaling in the corresponding method, the configured values ​​cannot be changed unless an RRC reconfiguration is performed on the UE.

[0658] As shown in [Method 3-1], when the UE configures a d_P value as the path loss offset or a d_P" value as the amount of change of the d_P value via upper-layer signaling, the path loss offset between the UE and the base station can be configured semi-statically and cannot be changed dynamically. This may be inflexible, and if the UE is mobile, the time interval required to correct the path loss offset may be long. However, if the UE has a fixed location like a CPE or very low mobility, or if information exchange between TRPs is very slow, this may be an effective method for determining the transmission power when sending uplink to only ULTRPs by reflecting the path loss offset while retaining additional dynamic signaling.

[0659] [Method 3-2]

[0660] The UE can configure a d_P value as a path loss offset or a d_P" value as a change in the d_P value from the base station via upper-layer signaling, and then receive MAC-CE signaling from the base station to update the pre-configured value. In this case, the UE can configure one or more d_P values, i.e., path loss offset, or configure a d_P" value, i.e., the change in the d_P value for each bandwidth portion or cell, via upper-layer signaling. For example, the UE can be configured with a d_P value or a d_P" value of 4, which is the maximum number of path loss measurement reference signals that the UE can track within a specific cell via upper-layer signaling. The UE can consider at least one combination of the following items as information that can be included in the MAC-CE signaling.

[0661] -Serving cell ID field (e.g., 5 digits)

[0662] -Uplink bandwidth portion ID field (e.g., 2 digits)

[0663] - Path loss measurement reference signal ID field (e.g., 6 bits)

[0664] - Path loss measurement reference signal group field (e.g., 2 bits)

[0665] -Activated path loss measurement reference signal ID field (e.g., 2 bits)

[0666] - Path loss offset (d_P) field (e.g., 5 to 8 bits)

[0667] - Path loss offset change (d_P) field (e.g., 5 to 8 bits)

[0668] - Combine TCI status or UL TCI status fields (e.g., 7 or 6 bits respectively).

[0669] As an example of MAC-CE signaling configuration information combination, if the UE configures a d_P value as a path loss offset or a d_P" value as the change in d_P value for each bandwidth portion via upper-layer signaling, then the UE can expect the MAC-CE signaling to include the serving cell ID field, the uplink bandwidth portion ID field, the path loss offset (d_P) field, and / or the change in path loss offset (d_P") field from the aforementioned information. The UE can receive the corresponding MAC-CE signaling and update either a d_P value configured in the bandwidth portion, i.e., the path loss offset, or update a d_P" value, i.e., the change in d_P value.

[0670] As another example of MAC-CE signaling configuration information combination, if the UE configures a d_P value as a path loss offset or a d_P" value as a change in the d_P value for each active path loss measurement reference signal within the cell via upper-layer signaling, the UE can expect the MAC-CE signaling to include the serving cell ID field, uplink bandwidth portion ID field, active path loss measurement reference signal ID field, path loss offset (d_P) field, and / or change in path loss offset (d_P") field from the aforementioned information. The UE can receive the corresponding MAC-CE signaling and update it to either a d_P value configured for the specific active path loss measurement reference signal within the cell, i.e., the path loss offset, or a d_P" value, i.e., the change in the d_P value.

[0671] The UE and the base station also define a field indicating the d_P value or d_P" value in the MAC-CE signaling that changes the path loss measurement reference signal. If the UE receives the MAC-CE, the UE can change the path loss measurement reference signal and can indicate it with the corresponding d_P value or d_P" value.

[0672] After receiving the corresponding MAC-CE from the base station, the UE can update the d_P value configured to the UE as a path loss offset via upper-layer signaling, or update the d_P" value received via MAC-CE signaling as a change in the d_P value, after three time slots including the transmission of the PUCCH for the PDSCH containing the corresponding MAC-CE, and apply this value when determining the uplink transmission power.

[0673] As shown in [Method 3-2], when the UE updates the d_P value as the path loss offset or the d_P" value as the change between the d_P value and the value received via MAC-CE signaling, since the UE can also update the path loss offset relatively dynamically in addition to the semi-static configuration method, this may help compensate for the amount of path loss when determining the UE's transmit power when the UE is mobile. However, as mentioned above, the UE and the base station may need to define new MAC-CE signaling, and the base station should be able to periodically measure the d_P value as the path loss offset or the d_P" value as the change between the d_P values, and the delay time should not be too long when exchanging information between TRPs.

[0674] [Method 3-3]

[0675] The UE can configure a d_P value as a path loss offset or a d_P" value as a change in the d_P value from the base station via upper-layer signaling, and then indicate this via DCI. In this case, the UE can configure one or more d_P values, i.e., path loss offsets, or configure d_P" values, i.e., the change in the d_P value for each bandwidth segment or cell, via upper-layer signaling. For example, the UE can be configured with a d_P value or a d_P" value of 4, which is the maximum number of path loss measurement reference signals that the UE can track within a specific cell via upper-layer signaling, and can update one of the four d_P values ​​or d_P" values ​​with the value received via DCI.

[0676] The UE can define a new UE group common DCI, define and configure RNTI applicable to the DCI, and receive update information about the d_P value as the path loss offset or the d_P" value as the change in the d_P value through the UE group common DCI.

[0677] The UE can indicate this using updated information about the d_P value as a path loss offset or the d_P" value as a change in the d_P value, as a new field in a regular UE-specific DCI (e.g., DCI formats 0_1, 0_2, 0_3, 1_1, 1_2, or 1_3).

[0678] When updating the d_P value as a path loss offset or the d_P" value as a change in the d_P value via DCI, the UE can use methods similar to the TPC accumulation or absolute TPC described above. If the UE uses a method like TPC accumulation when updating the d_P value as a path loss offset or the d_P" value as a change in the d_P value via DCI, the UE can update d_P (i.e., the path loss offset configured via upper-layer signaling) by adding the d_P" value (i.e., the change in the d_P value) via DCI. If the UE uses a method like absolute TPC when updating the d_P value as a path loss offset or the d_P" value as a change in the d_P value via DCI, the UE can replace the d_P configured via upper-layer signaling with the d_P received via DCI.

[0679] When updating the d_P value or d_P" value via DCI, there may be situations where the UE cannot receive the DCI. Therefore, a HARQ-ACK transmission operation for DCI can be defined to report to the base station whether the DCI for updating the d_P or d_P" value has been received. The UE can update the d_P value configured to the UE as a path loss offset via upper-layer signaling, or update the d_P" value received via MAC-CE signaling as a change in the d_P value, three time slots after the PUCCH transmission including HARQ-ACK information for the corresponding DCI including the corresponding MAC-CE, and apply this value when determining the uplink transmit power. Alternatively, the UE can update the d_P value configured to the UE as a path loss offset via upper-layer signaling, or update the d_P" value received via MAC-CE signaling as a change in the d_P value, after a specific time starting from the HARQ-ACK information including HARQ-ACK information for the PDSCH including the corresponding MAC-CE, and apply this value when determining the uplink transmit power; this specific time can be reported as a UE capability.

[0680] As shown in [Method 3-3], when the UE updates the d_P value as the path loss offset or the d_P” value as the change in the d_P value obtained through DCI signaling, since the UE can dynamically update the path loss offset based on DCI in addition to the semi-static configuration method, this may help compensate for the path loss between the UL TRP and the UE when the UE is mobile and determining the UE's transmit power. However, as mentioned above, the UE and the base station may need to define an additional field in the DCI that may increase DCI overhead, and the base station should be able to periodically measure the d_P value as the path loss offset or the d_P” value as the change in the d_P value, and the delay time should not be too long when exchanging information between TRPs.

[0681] [Methods 3-4]

[0682] The UE can configure a d_P value as a path loss offset or a d_P" value as a change in the d_P value from the base station via upper-layer signaling. It then receives two or more CSI-RS from the base station and implicitly receives the d_P or d_P" value through the received power difference of the corresponding CSI-RS. In this case, the UE can configure one or more d_P values, i.e., path loss offset, or configure a d_P" value, i.e., the change in the d_P value for each bandwidth segment or cell, via upper-layer signaling. For example, the UE can be configured with a d_P value or a d_P" value of 4, which is the maximum number of path loss measurement reference signals that the UE can track within a specific cell via upper-layer signaling. The UE can receive CSI-RS with assumed different transmit powers from the base station to receive an updated value of one of the four d_P values ​​or d_P" values, and can implicitly identify the d_P or d_P" value by using the difference in received power. To this end, the UE can configure CSI-RS resources to update the corresponding values ​​based on the d_P value as the path loss offset or the number of d_P" values ​​configured via upper-layer signaling as the change in d_P value.

[0683] As shown in [Methods 3-4], when the UE updates the d_P value as the path loss offset or the d_P" value as the change in d_P value by configuring different receive power values ​​using the transmit power of different CSI-RS resources, the UE can also dynamically update the path loss offset based on DCI, in addition to the semi-static configuration method. This may help compensate for the path loss between only UL TRP and UE when determining the UE's transmit power while the UE is mobile, and in the absence of interference signals, the unquantized d_P or d_P" value can be sent to the UE through the transmit power difference of CSI-RS resources, thereby improving the accuracy of the information. However, since the UE must define CSI-RS resources, which assume different transmit powers to update the d_P or d_P" value, and the difference between the transmit powers of the corresponding CSI-RS resources may also vary depending on the d_P or d_P" value calculated by the base station, the overhead of the base station may increase.

[0684] [Methods 3-5]

[0685] The UE can receive the d_P or d_P" value from the base station via at least one combination of [Method 3-1] to [Method 3-4] and update the pre-configured value. In this case, when a specific event defined within the base station occurs, the base station can notify the UE to update the pre-configured or activated value by sending the d_P or d_P" value. A specific event that may occur at the base station is, for example, if the d_P or d_P" value calculated via [Method 2-1] and / or [Method 2-2] changes by a certain percentage or more compared to a previously calculated d_P or d_P" value (e.g., if it decreases or increases by 10% or more), the base station can notify the UE to update the newly calculated d_P or d_P" value. The UE can be configured using a timer from the base station. If the base station does not update the d_P value (i.e., path loss offset) or the d_P" value (i.e., the amount of change in the d_P value within the time defined by the timer), the UE can perform at least one combination of the following.

[0686] - The UE can request the base station to update the d_P or d_P" value.

[0687] - The UE can perform uplink transmission to the base station without applying the d_P or d_P" value.

[0688] - The UE can perform uplink transmission to the base station by applying the d_P value or d_P" value initially received from the base station.

[0689] - The UE can determine that a radio link failure has occurred and request the base station to reset the upper-layer signaling.

[0690] The UE may expect to be notified by the base station of at least one combination of [Method 3-1]-[Method 3-5] via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling, or at least one combination of [Method 3-1] to [Method 3-5] may be fixedly defined in the standard. Furthermore, if the base station notifies the UE of at least one combination of a particular method via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling, this may mean that the UE cannot support at least one other combination of that particular method. For example, the UE may expect [Method 3-2] to be fixedly defined in the standard for methods used to update path loss offsets. As another example, [Method 3-1] may be notified to the UE by the base station via at least one combination of upper-layer signaling, MAC-CE signaling, and L1 signaling; in this case, the UE may consider that the base station has notified it that it does not support [Method 3-2].

[0691] The UE can report to the base station whether it supports at least one combination of [Method 3-1] to [Method 3-5] as a UE capability. In this case, if the UE reports to the base station that a combination of one or more specific methods is supported as a UE capability, it can be assumed that the UE has reported that it cannot support one or more other combinations of methods. For example, the UE can report to the base station whether it supports [Method 3-1] or [Method 3-2]. As another example, the UE can report to the base station that it can support [Method 3-1], and this UE capability report may imply that the UE cannot support [Method 3-2].

[0692] Figure 16 This is a diagram illustrating the operation of a UE for uplink transmit power control according to an embodiment of this disclosure.

[0693] Reference Figure 16 In operation 16-00, the UE can send UE capabilities to the base station. In this case, the UE capability signaling that can be reported may be a combination of PUSCH, PUCCH, UE capabilities related to SRS transmission and transmission power parameters, UE performance related to unified TCI state operation, and at least one of the UE capabilities corresponding to [Method 1-1] and [Method 1-2], [Method 2-1] and [Method 2-2], and [Method 3-1] to [Method 3-5]. Operation 16-00 may also be omitted.

[0694] In Operation 16-05, the UE can receive upper-layer signaling from the base station based on the reported UE capabilities. In this case, the UE can receive and use upper-layer parameters for PUSCH, PUCCH, upper-layer signaling related to SRS transmission and transmission power parameters, upper-layer signaling related to unified TCI state operation, and upper-layer parameters supporting at least one combination of [Method 1-1] and [Method 1-2], [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-5]. For example, the UE can receive configuration for uplink power control via higher-layer signaling. The uplink power control configuration may include a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index.

[0695] In operation 16-10, the UE may transmit an uplink signal to the base station. In this case, the UE may perform the method of transmitting the uplink signal by a combination of at least one of [method 2-1] and [method 2-2]. For example, the UE may receive information about the path loss offset (e.g., d_P). The UE may determine the transmission power based on DL PL RS and the path loss offset, and perform uplink transmission based on the determined transmission power.

[0696] In operations 16-15, the UE can be instructed by signaling to receive an update of path loss information from the base station. In this case, the UE can indicate the update of path loss information from the base station by using a combination of at least one of [methods 3-1] to [methods 3-5].

[0697] In operations 16-20, the UE can perform uplink transmission for UL TRP only based on the updated path loss information.

[0698] The flowcharts above illustrate methods that can be implemented according to the principles of this disclosure, and various modifications can be made to the methods shown in the flowcharts of this specification. For example, although shown as a series of steps, the individual steps in each diagram may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps may be omitted or replaced with other steps.

[0699] Figure 17 This is a diagram illustrating the operation of a base station for uplink transmit power control according to an embodiment of the present disclosure.

[0700] Reference Figure 17 In operation 17-00, the base station can receive UE capabilities from the UE. In this case, the UE capability signaling that the base station can receive may be a combination of at least one of [Method 1-1] and [Method 1-2], [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-5]. Operation 17-00 may also be omitted.

[0701] In Operation 17-05, the base station can send upper-layer signaling to the UE based on the UE capabilities reported by the UE. In this case, the base station can define upper-layer parameters for PUSCH, PUCCH, upper-layer signaling related to SRS transmission and transmission power parameters, upper-layer signals related to unified TCI state operation, and combinations thereof supporting at least one of [Method 1-1] and [Method 1-2], [Method 2-1] and [Method 2-2], [Method 3-1] to [Method 3-5], and send one of these parameters to the UE. For example, the base station can send a configuration for uplink power control to the UE via higher-layer signaling. The uplink power control configuration may include a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index.

[0702] In operation 17-10, the base station can receive uplink signals from the UE. In this case, the base station may expect the UE to perform a method of transmitting uplink signals by a combination of at least one of [method 2-1] and [method 2-2]. For example, the base station may send information about the path loss offset (e.g., d_P) to the UE. The base station may receive uplink transmissions based on the transmission power from the UE. The transmission power is based on DL PL RS and the path loss offset.

[0703] In operations 17-15, the base station may send signaling to the UE indicating an update of path loss-related information. In this case, the base station may send the signaling indicating an update of path loss-related information to the UE by using a combination of at least one of [method 3-1] to [method 3-5].

[0704] In operations 17-20, the base station may expect the UE to perform uplink transmission for UL TRP only and receive uplink signals based on the updated path loss related information.

[0705] The flowcharts above illustrate methods that can be implemented according to the principles of this disclosure, and various modifications can be made to the methods shown in the flowcharts of this specification. For example, although shown as a series of steps, the individual steps in each diagram may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps may be omitted or replaced with other steps.

[0706] Figure 18 The structure of a UE in a wireless communication system according to an embodiment of the present disclosure is shown.

[0707] Reference Figure 18 The UE may include a transceiver comprising a UE receiver 18-00 and a UE transmitter 18-10, a memory (not shown), and a UE processor 18-05 (or a UE controller or processor). The transceivers 18-00 and 18-10, the memory, and the UE processor 18-05 of the UE can operate according to the communication method described above. However, the components of the UE are not limited to the examples described above. For example, the UE may include more or fewer components than those described above. Furthermore, the transceivers 18-00 and 18-10, the memory, and the processor 18-05 may be implemented as a single chip.

[0708] Transceivers 18-00 and 18-10 can transmit signals to and receive signals from the BS. These signals may include control information and data. For this purpose, transceivers 18-00 and 18-10 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal and an RF receiver for low-noise amplification of the received signal and down-converting its frequency. However, this is only one example of transceivers 18-00 and 18-10, and the components of the transceivers are not limited to RF transmitters and RF receivers.

[0709] Transceivers 18-00 and 18-10 can receive signals via a radio channel, output signals to a processor, and transmit signals output from the processor via a radio channel.

[0710] The memory can store the programs and data required for UE operation. In addition, the memory can store control information or data included in signals sent and received by the UE. The memory can be configured with storage media such as read-only memory (ROM), random access memory (RAM), hard disk, optical disc (CD)-ROM, and digital versatile disc (DVD), or a combination of storage media. There can be multiple memories.

[0711] Processor 18-05 can control a series of processes to allow the UE to operate according to the above embodiments. For example, processor 18-05 can control the UE's elements to receive DCI including two layers and simultaneously receive multiple PDSCHs. There can be multiple processors 18-05, and processor 1905 can perform operations controlling the UE's elements by executing programs stored in memory.

[0712] Figure 19 The structure of a BS in a wireless communication system according to an embodiment of the present disclosure is shown.

[0713] Reference Figure 19 The BS may include a transceiver comprising a BS receiver 19-00 and a BS transmitter 19-10, a memory (not shown), and a BS processor 19-05 (or a BS controller or processor). The transceivers 19-00 and 19-10, the memory, and the BS processor 19-05 of the BS may operate according to the communication method of the BS. However, the components of the BS are not limited to the examples described above. For example, the BS may include more or fewer components than those described above. Furthermore, the transceivers 19-00 and 19-10, the memory, and the processor 19-05 may be implemented as a single chip.

[0714] Transceivers 19-00 and 19-10 can transmit signals to and receive signals from the UE. These signals may include control information and data. For this purpose, transceivers 19-00 and 19-10 may include an RF transmitter for up-converting and amplifying the frequency of the transmitted signal and an RF receiver for low-noise amplification of the received signal and down-converting its frequency. However, this is only one example of transceivers 19-00 and 19-10, and the components of the transceivers are not limited to RF transmitters and RF receivers.

[0715] Transceivers 19-00 and 19-10 can receive signals via a radio channel, output signals to processor 19-05, and transmit signals output from the processor via a radio channel.

[0716] The memory can store the programs and data required for BS operation. It can also store control information or data included in the signals sent and received by the BS. The memory can be configured using storage media such as ROM, RAM, hard disks, CD-ROMs, and DVDs, or combinations thereof. There can be multiple memories.

[0717] Processor 19-05 can control a series of processes to allow the BS to operate according to embodiments of this disclosure. For example, processor 19-05 can configure a two-layer DCI including allocation information for multiple PDSCHs and control each element of the BS to send DCIs. There can be multiple processors 19-05, and processor 19-05 can perform operations controlling the elements of the BS by executing programs stored in memory.

[0718] The methods of the various embodiments described in the claims or this disclosure can be implemented in hardware, software, or a combination of hardware and software.

[0719] When these methods are 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 may be configured to be executed by one or more processors within an electronic device. At least one program may include instructions to cause the electronic device to perform methods as defined in the appended claims and / or as disclosed herein according to various embodiments of this disclosure.

[0720] These programs (software modules or software) can be stored in non-volatile memory, including random access memory and flash memory, read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), disk storage devices, optical disc-ROM (CD-ROM), digital versatile disc (DVD) or other types of optical storage devices, or magnetic tape. Alternatively, any combination of some or all of these can form a memory storing programs. Furthermore, multiple such memories can be included in an electronic device.

[0721] Furthermore, the program can be stored in an attachable storage device that can be accessed by electronic devices via communication networks such as the Internet, intranets, local area networks (LANs), wide area networks (WLANs), and storage area networks (SANs), or combinations thereof. Such storage devices can be accessed by electronic devices via external ports. Additionally, separate storage devices on communication networks can be accessed by portable electronic devices.

[0722] In the detailed embodiments described above, elements included in this disclosure are represented in a singular or plural form according to the presented embodiments. However, for ease of description, the singular or plural form may be appropriately chosen depending on the presented context, and this disclosure is not limited to elements represented in a singular or plural form. Thus, an element represented in a plural form may also include a single element, or an element represented in a singular form may also include multiple elements.

[0723] The embodiments of this disclosure described and illustrated in the specification and accompanying drawings are provided to facilitate the explanation of the technical content of this disclosure and to aid in understanding it, and are not intended to limit the scope of this disclosure. That is, for matters obvious to those skilled in the art, other modifications and changes can be made based on the technical concepts of this disclosure. Furthermore, the various embodiments described above can be combined as needed. For example, one embodiment of this disclosure can be partially combined with other embodiments to operate a base station and a terminal. For example, embodiments 1 and 2 of this disclosure can be combined with each other to operate a base station and a terminal. Moreover, although the above embodiments are described based on an FDD LTE system, other variations based on the technical concepts of the embodiments can also be implemented in other communication systems such as TDD LTE, 5G, or NR systems.

[0724] In the accompanying drawings describing the methods of this disclosure, the order described does not always correspond to the order in which the steps of each method are performed, and the order of the steps may be changed, or the steps may be performed in parallel.

[0725] Alternatively, in the accompanying drawings describing the methods of this disclosure, some elements may be omitted and only some elements may be included without departing from the basic spirit and scope of this disclosure.

[0726] Furthermore, in the methods of this disclosure, some or all of the elements of each embodiment may be combined without departing from the basic spirit and scope of this disclosure.

[0727] While this disclosure has been shown and described with reference to various embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: Information about path loss offset is received via a first transmitting and receiving point (TRP), the path loss offset being the difference between (i) the first path loss between the UE and the first TRP and (ii) the second path loss between the UE and the second TRP; The transmit power for uplink transmission for the second TRP is determined based on the downlink reference signal for the first path loss and path loss offset. as well as Uplink transmission is performed via the second TRP based on the transmission power.

2. The method according to claim 1, wherein, Information about path loss offset is included in the downlink control information (DCI).

3. The method according to claim 1, further comprising: The configuration for uplink power control is received via the first TRP. This configuration includes a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index. The transmission power is also determined based on p0, α, and the closed-loop index used for the uplink transmission of the first TRP.

4. The method according to claim 1, wherein, The UE does not support receiving downlink signals via the second TRP.

5. The method according to claim 1, wherein, The execution of uplink transmission based on transmission power includes: Based on the transmission power, at least one of the Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sound Reference Signal (SRS) is transmitted via the second TRP.

6. A method performed by a base station in a wireless communication system, the method comprising: Identify the path loss offset, which is the difference between (i) the first path loss between the user equipment (UE) and the first transmit and receive point (TRP) and (ii) the second path loss between the UE and the second TRP; Information about path loss offset is sent to the UE via the first TRP; as well as Receive uplink transmissions based on transmit power from the UE via the second TRP. The uplink transmission power for the second TRP is based on the downlink reference signal for the first path loss and path loss offset.

7. The method according to claim 6, wherein, Information about path loss offset is included in the downlink control information (DCI).

8. The method according to claim 6, further comprising: The configuration for uplink power control is sent to the UE via the first TRP. The configuration includes a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index. The transmission power is also based on p0, α, and the closed-loop index used for the uplink transmission of the first TRP.

9. The method according to claim 6, wherein, The second TRP only supports receiving uplink signals from the UE.

10. The method according to claim 6, wherein, Uplink transmission based on transmit power reception includes: Based on the transmit power, at least one of the Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), and Sound Reference Signal (SRS) is received from the UE via the second TRP.

11. A user equipment (UE) in a wireless communication system, the UE comprising: transceiver; as well as The processor, coupled to the transceiver, is configured to: Information about path loss offset is received via a first transmitting and receiving point (TRP), whereby the path loss offset is the difference between (i) the first path loss between the UE and the first TRP and (ii) the second path loss between the UE and the second TRP. The uplink transmission power for the second TRP is determined based on the downlink reference signal for the first path loss and path loss offset. Uplink transmission is performed via the second TRP based on the transmission power.

12. The UE according to claim 11, wherein, Information about path loss offset is included in the downlink control information (DCI), and The UE does not support receiving downlink signals via the second TRP.

13. The UE according to claim 11, in, The processor is also configured to: The configuration for uplink power control is received via the first TRP. The configuration includes a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index. The transmission power is also determined based on p0, α, and the closed-loop index used for the uplink transmission of the first TRP.

14. A base station in a wireless communication system, the base station comprising: transceiver; as well as The processor, coupled to the transceiver, is configured to: Identify the path loss offset, which is the difference between (i) the first path loss between the user equipment (UE) and the first transmit and receive point (TRP) and (ii) the second path loss between the UE and the second TRP; Information about path loss offset is sent to the UE via the first TRP; as well as Receive uplink transmissions based on transmit power from the UE via the second TRP. The uplink transmission power for the second TRP is based on the downlink reference signal for the first path loss and path loss offset.

15. The base station according to claim 14, in, The processor is also configured to: The configuration for uplink power control is sent to the UE via the first TRP. The configuration includes a first parameter indicating p0, a second parameter indicating α, and a third parameter indicating the closed-loop index. The transmit power is also based on p0, α, and the closed-loop index for uplink transmission in the first TRP, and Information about path loss offset is included in the downlink control information (DCI).

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