Method and apparatus for saving energy in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a wireless communication system includes receiving configuration information associated with at least one first reference signal (RS) from a base station; receiving reconfiguration information associated with the at least one second RS from the base station; and identifying a path loss RS (PL-RS) for measuring a downlink path loss based on the configuration information and the reconfiguration information, wherein a first transmission density of the at least one first RS is greater than a second transmission density of the at least one second RS.

Description

Technical Field

[0001] The present disclosure relates generally to a wireless communication system, and more particularly, to a method and apparatus for saving energy in a wireless communication system. Background Art

[0002] 5G mobile communication technology defines a wide frequency band, making high transmission rates and new services possible, and can be implemented not only in "below 6 GHz" frequency bands such as 3.5 GHz, but also in "above 6 GHz" frequency bands (including 28 GHz and 39 GHz) called millimeter waves. In addition, implementation of 6G mobile communication technology (called a super 5G system) in terahertz (THz) frequency bands (e.g., 95 GHz to 3THz frequency bands) has been considered in order to achieve a transmission rate fifty times faster than 5G mobile communication technology and ultra-low latency that is one-tenth of that of 5G mobile communication technology.

[0003] At the beginning of the development of 5G mobile communication technology, in order to support services and meet performance requirements for enhanced mobile broadband (eMBB), ultra-reliable and 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 reducing radio wave path loss and increasing radio wave transmission distance in millimeter waves; supporting parameters for dynamic operation of efficient utilization of millimeter wave resources and time slot formats (for example, operating multiple subcarrier spacings); initial access technology for supporting multi-beam transmission and wide frequency bands; definition and operation of bandwidth part (BWP); new channel coding methods such as low-density parity check (LDPC) codes for large-volume data transmission and polar codes for highly reliable transmission of control information; L2 preprocessing; and network slicing for providing dedicated networks dedicated to specific services. .

[0004] Currently, with respect to services supported by 5G mobile communication technology, the industry is continuously discussing improvements and performance enhancements on initial 5G mobile communication technology, and has completed physical layer standardization on technologies such as: vehicle-to-everything (V2X) for assisting driving decisions based on information about the location and status of a vehicle sent by a vehicle and for improving user convenience, new radio unlicensed (NR-U) for system operations that comply with various regulatory-related requirements in unlicensed frequency bands, new radio (NR) user equipment (UE) power saving, non-terrestrial network (NTN) as UE satellite direct communication for ensuring coverage in areas where communication with terrestrial networks is not possible, and positioning.

[0005] In addition, the standardization of air interface architecture / protocols for technologies such as the Industrial Internet of Things (IIOT) for supporting new services through interworking and integration with other industries; Integrated Access and Backhaul (IAB) for providing nodes for network service area expansion by supporting wireless backhaul links and access links in an integrated manner; Mobility enhancements including conditional handover and dual active protocol stack (DAPS) handover; and two-step random access for simplifying the random access process (two-step random access channel (RACH) for NR). At the same time, the standardization of system architecture / services for technologies such as the 5G baseline architecture (e.g., service-based architecture or service-based interface) for combining network function virtualization (NFV) and software defined network (SDN) technologies); and mobile edge computing (MEC) for receiving services based on UE location.

[0006] With the commercialization of 5G mobile communication systems, an exponentially growing number of connected devices will be connected to the communication network, and it is therefore expected that enhanced functions and performance of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research on the following technologies is on the agenda: extended reality (XR) for efficient support of augmented reality (AR), virtual reality (VR), mixed reality (MR), etc.; 5G performance improvement and complexity reduction by utilizing artificial intelligence (AI) and machine learning (ML); AI service support; metaverse service support; and drone communication.

[0007] Furthermore, such developments in 5G mobile communication systems will lay the foundation not only for the development of new waveforms for providing coverage in the terahertz band of 6G mobile communication technology; multi-antenna transmission technologies such as full-dimensional MIMO (FD-MIMO), array antennas, and massive antennas; metamaterial-based lenses and antennas for improving coverage of terahertz band signals; high-dimensional spatial multiplexing technology using orbital angular momentum (OAM); and reconfigurable smart surfaces (RIS), but will also lay the foundation for the development of full-duplex technology for improving the frequency efficiency of 6G mobile communication technology and improving system networks; AI-based communication technology for achieving system optimization from the design stage by leveraging satellites and artificial intelligence (AI) and internalizing end-to-end AI support functions; and next-generation distributed computing technology for implementing services at a complexity level that exceeds the limits of UE operating capabilities by leveraging ultra-high performance communication and computing resources.

[0008] As wireless communication systems have been developed to provide various services, there is a need in the art for a method for smoothly providing services. In particular, there is a need in the art for a technology for controlling reference signals to reduce energy consumption of base stations in wireless communication systems. Summary of the invention

[0009] Problem Solution

[0010] The present disclosure relates to a wireless communication network, and more particularly, to a terminal and a communication method thereof in a wireless communication system.

[0011] According to an aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes: receiving configuration information associated with at least one first reference signal (RS) from a base station; receiving reconfiguration information associated with at least one second RS from the base station; and identifying a path loss RS (PL-RS) for measuring a downlink path loss based on the configuration information and the reconfiguration information, wherein a first transmission density of the at least one first RS is greater than a second transmission density of the at least one second RS.

[0012] Advantageous Effects of the Invention

[0013] Aspects of the present disclosure are to address at least the above problems and / or disadvantages and to provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide an efficient communication method in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other aspects, features and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the accompanying drawings, in which: Figure 1 The basic structure of the time-frequency domain as a wireless resource area in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 2 A time slot structure considered in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 3 An embodiment of a time domain mapping structure and a beam scanning operation of a synchronization signal according to the present disclosure is shown; Figure 4 A synchronization signal block (SSB) considered in a wireless communication system according to an embodiment of the present disclosure is shown; Figure 5 Various transmission situations of SSB in a frequency band below 6 GHz considered in a communication system according to an embodiment of the present disclosure are shown; Figure 6 shows a transmission situation of SSB in a frequency band of 6 GHz or higher considered in a wireless communication system according to an embodiment of the present disclosure; Figure 7 The transmission situation of SSB according to the subcarrier spacing of 5 milliseconds (ms) in the wireless communication system according to an embodiment of the present disclosure is shown; Figure 8A demodulation reference signal (DMRS) pattern used for communication between a base station and a terminal in a 5G system according to an embodiment of the present disclosure is shown; Fig. 9 Channel estimation using DMRS received in a physical UL shared channel (PUSCH) in a time band of a 5G system according to an embodiment of the present disclosure is shown; Fig.10 A method for reconfiguring SSB transmission through dynamic signaling of a 5G system according to an embodiment of the present disclosure is shown; Fig.11 is a flowchart of a terminal for determining RS resources for a path loss reference signal (PL-RS) according to reconfiguration of a reference signal for energy saving in a 5G system according to an embodiment of the present disclosure; Fig.12 is a flowchart of an operation of reconfiguring reference signals for energy saving in a 5G system according to an embodiment of the present disclosure; Fig.13 A terminal according to an embodiment is shown; and Fig.14 A base station according to an embodiment is shown. DETAILED DESCRIPTION

[0015] Aspects of the present disclosure are to solve at least the above problems and / or disadvantages and provide at least the advantages described below. Therefore, one aspect of the present disclosure is to provide a terminal in a wireless communication system and a communication method thereof.

[0016] The present disclosure is to address at least the above problems and disadvantages and to provide at least the advantages described below.

[0017] Accordingly, an aspect of the present disclosure is to provide an apparatus and method capable of effectively providing a service in a wireless communication system.

[0018] Another aspect of the present disclosure is to provide an operation of a BS and a terminal to determine a reference signal for measuring a downlink path loss during an operation for reducing energy consumption of the BS.

[0019] Another aspect of the present disclosure is to provide a BS which can determine a reference signal for measuring a downlink path loss to reduce energy consumption and perform channel status and beam management.

[0020] According to an aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system includes: receiving configuration information associated with at least one first reference signal (RS) from a base station; receiving reconfiguration information associated with at least one second RS from the base station; and identifying a path loss RS (PL-RS) for measuring a downlink path loss based on the configuration information and the reconfiguration information, wherein a first transmission density of the at least one first RS is greater than a second transmission density of the at least one second RS.

[0021] According to one aspect of the present disclosure, a method performed by a base station in a wireless communication system includes: transmitting configuration information associated with at least one first RS to a UE; and transmitting reconfiguration information associated with at least one second RS to the UE, wherein a PL-RS for measuring downlink path loss is identified based on the configuration information and the reconfiguration information, and wherein a first transmission density of the at least one first RS is greater than a second transmission density of the at least one second RS.

[0022] According to one aspect of the present disclosure, a UE includes: a transceiver; and at least one processor, which is connected to the transceiver and configured to: receive configuration information associated with at least one first RS from a base station; receive reconfiguration information associated with at least one second RS from the base station; and identify a PL-RS for measuring downlink path loss based on the configuration information and the reconfiguration information, wherein a first transmission density of at least one first RS is greater than a second transmission density of at least one second RS.

[0023] According to one aspect of the present disclosure, a base station includes: a transceiver; and at least one processor, which is connected to the transceiver and configured to: transmit configuration information associated with at least one first RS to a UE, and transmit reconfiguration information associated with at least one second RS to the UE, wherein a PL-RS for measuring downlink path loss is identified based on the configuration information and the reconfiguration information, and wherein a first transmission density of the at least one first RS is greater than a second transmission density of the at least one second RS.

[0024] Invention Mode

[0025] Hereinafter, embodiments of the present disclosure are described in detail with reference to the accompanying drawings.

[0026] When describing the embodiments, for the sake of clarity and conciseness, technical contents that are known in the technical field to which the present disclosure belongs and are not directly related to the present disclosure will be omitted.

[0027] Due to the same reason, some components in the drawings are exaggerated, omitted or schematically shown, and the size of each component does not completely reflect the actual size. In each of the drawings, the same reference numerals are given to the same or corresponding elements.

[0028] The advantages and features of the present disclosure and methods for achieving them will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but can be implemented in various different forms, which are provided not only to make the scope of the present disclosure comprehensive but also to allow those skilled in the art to fully understand the categories of the present disclosure. Throughout the specification, the same reference numerals refer to the same elements.

[0029] The components included in the present disclosure are expressed in singular or plural form. However, for ease of explanation, singular or plural expression is appropriately selected according to the specific situation, and the present disclosure is not limited to a single component or multiple components. A component expressed in plural form can be configured as a single component, and a component expressed in singular form can be configured as multiple components.

[0030] The term unit or a term including a suffix -machine, -user, etc. used hereinafter may indicate a unit that processes at least one function or operation and may be implemented by hardware, software, or a combination of hardware and software.

[0031] In the following description, a base station (BS) is an entity that allocates resources to a terminal, and may be at least one of a gNode B, a gNodeB, a Node B, a wireless access unit, a base station controller, and a node on a network. A terminal may include a user equipment (UE), a mobile station (MS), a cellular phone, a smart phone, a computer, or a multimedia system capable of performing a communication function. "DL (DL)" refers to a radio link through which a BS transmits a signal to a terminal, and "UL (UL)" refers to a radio link through which a terminal transmits a signal to a BS. This article may describe an LTE or LTE-A system by way of example, but the embodiments of the present disclosure may also be applied to other communication systems with similar technical backgrounds or channel types, such as the fifth generation mobile communication technology (5G, new radio, and NR) developed beyond LTE-A. The 5G herein may be a concept covering existing LTE, LTE-A, or other similar services. The embodiments of the present disclosure may also be applied to other communication systems with some modifications without significantly departing from the scope of the present disclosure.

[0032] As used herein, "unit" refers to a software element or hardware element that performs a predetermined function, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). However, a unit does not always have a meaning limited to software or hardware, and can be constructed to be stored in an addressable storage medium or to execute one or more processors. Therefore, a unit includes a software element, an object-oriented software element, a class element or a task element, a process, a function, an attribute, a procedure, a subroutine, a program code segment, a driver, a firmware, a microcode, a circuit, data, a database, a data structure, a table, an array, and a parameter. The elements and functions provided by the unit can be combined into fewer elements or units, or divided into more elements or units. In addition, elements and units can be implemented as one or more central processing units (CPUs) in a reproduction device or a secure multimedia card. The unit in the embodiment may include one or more processors.

[0033] Hereinafter, a method and apparatus for improving UL coverage when performing a random access procedure are disclosed, but the method and apparatus are not limited to each example. All one or more embodiments proposed in the present disclosure, or a combination of some embodiments, can be used in a frequency resource configuration method corresponding to different channels. Therefore, by determination by those skilled in the art, the embodiments of the present disclosure can be applied by partial modification without departing from the scope of the present disclosure.

[0034] The terms to be described below are defined in consideration of functions in the present disclosure and may differ depending on the user, the user's intention or habit. Therefore, the definition of the terms should be determined based on the contents throughout the entire specification.

[0035] The above three services (i.e., eMBB, URLLC, and mMTC) in a 5G communication system (hereinafter may be used interchangeably with a "5G system") may be multiplexed and transmitted in a single system. In order to meet the different needs of the corresponding services, different transmission / reception techniques and transmission / reception parameters may be used between the accompanying drawings. However, the above mMTC, URLLC, and eMBB are merely examples of different service types, and the service types according to the embodiments of the present disclosure are not limited to the above examples.

[0036] Hereinafter, the frame structure of the 5G system will be described in detail with reference to the accompanying drawings. For ease of explanation, the configuration of the 5G system will be used as an example to describe the wireless communication system according to the embodiment of the present disclosure, but the embodiment of the present disclosure can also be applied to 5G or higher systems or different communication systems to which the present disclosure is applicable.

[0037] Figure 1 The basic structure of the time-frequency domain as a wireless resource area in a wireless communication system according to an embodiment of the present disclosure is shown.

[0038] refer to Figure 1 , the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The basic unit of resources in the time-frequency domain is a resource element (RE) 101, and can be defined by one orthogonal frequency division multiplexing (OFDM) symbol 102 (or discrete Fourier transform-spread OFDM (DFT-s-OFDM) symbol) in the time domain and one subcarrier 103 in the frequency domain. In the frequency domain, the number of subcarriers per resource block (RB) is represented by (e.g., 12) consecutive REs can configure one resource block (RB) 104. In the time domain, the number of symbols per subframe is represented by One subframe 110 may be configured by 10 consecutive OFDM symbols.

[0039] Figure 2 A time slot structure considered in a wireless communication system according to an embodiment of the present disclosure is shown.

[0040] refer to Figure 2 , shows an example of a time slot structure including a frame 200, a subframe 201, and a time slot 202 or 203. One frame 200 may be defined as 10 ms. One subframe 201 may be defined as 1 ms, and thus one frame 200 may be configured by a total of 10 subframes 201. One time slot 202 or 203 may be defined as 14 OFDM symbols (i.e., the number of symbols per time slot ( )=14). One subframe 201 may be configured by one or more time slots 202 or 203, and the number of time slots 202 or 203 of each subframe 201 may vary according to a configured value µ 204 or 205 for a subcarrier spacing (SCS).

[0041] The time slot structure with μ=0 204 and μ=1 205 as the subcarrier spacing configuration value is shown. When μ=0 204, one subframe 201 can be configured by one time slot 202, and when μ=1 205, one subframe 201 can be configured by two time slots (e.g., including time slot 203). That is, the number of time slots per subframe ( ) can vary according to the configured value μ of the subcarrier spacing, and the number of time slots per frame ( ) can be changed accordingly. For example, according to the configuration of µ per subcarrier spacing and It can be defined by the following Table 1.

[0042] Table 1

[0043] In a 5G communication system, the BS may transmit a synchronization signal block (SSB) (or SS block or SS / PBCH block) to the terminal for initial access of the terminal, and the SSB may include a primary synchronization signal (PSS), a secondary synchronization signal (SSS) and a physical broadcast channel (PBCH).

[0044] In the initial access phase of the terminal accessing the system, the terminal may first perform a cell search to obtain DL time domain / frequency domain synchronization and a cell identity (ID) from a synchronization signal. The synchronization signal may include a PSS and a SSS. The terminal may receive a PBCH transmitting a master information block (MIB) from the BS to obtain basic parameter values ​​and system information related to transmission and / or reception, such as system bandwidth or related control information. Based on the basic parameter values ​​and system information related to transmission and / or reception, the terminal may decode a control channel (e.g., a physical DL control channel (PDCCH)) and a data channel (e.g., a physical DL shared channel (PDSCH)) to obtain a system information block (SIB). In the following, a control channel may refer to a PDCCH or a physical UL control channel (PUCCH), a PDCCH may be referred to as a DL control channel, and a PUCCH may be referred to as a UL control channel. In addition, a data channel may refer to a PDSCH or a physical UL shared channel (PUSCH), a PDSCH may be referred to as a DL data channel, and a PUSCH may be referred to as a UL data channel. After obtaining the SIB, the terminal can exchange the terminal's identification related information (e.g., cell ID) with the BS through the random access phase, and can initially access the network through the registration and authentication phase. In addition, the terminal can receive the SIB from the BS to obtain cell public control information related to transmission and / or reception. For example, the cell public control information related to transmission and / or reception may include at least one of random access related control information, paging related control information, and public control information about various physical channels (e.g., PDCCH and PUCCH).

[0045] The synchronization signal is used as a cell search criterion, and a subcarrier spacing suitable for the channel environment (e.g., phase noise of each frequency band) can be applied to the synchronization signal. In a data channel (e.g., PDSCH or PUSCH) or a control channel (e.g., PDCCH or PUCCH), different subcarrier spacings can be applied according to the service type to support various services required in the 5G communication system.

[0046] Figure 3 The time domain mapping structure and beam scanning operation of the synchronization signal according to an embodiment of the present disclosure are shown.

[0047] For the purpose of description, the following elements may be defined.

[0048] PSS is used as a DL time / frequency synchronization standard and may provide partial information of a cell ID.

[0049] SSS is used as a DL time / frequency synchronization standard and can provide information of the cell ID in addition to the PSS. In addition, this signal can be used as a reference signal for PBCH demodulation.

[0050] The PBCH may provide necessary system information (e.g., MIB) required for transmitting and / or receiving data channels and control channels by the terminal. For example, the necessary system information may include at least one of the following: search space related control information (including radio resource mapping information of the control channel), scheduling control information for transmitting system information for a separate data channel, and a system frame number (SFN) as a frame unit index used as a timing standard.

[0051] The SS / PBCH block can be configured by N (for example, N is 4 in the 5G system) OFDM symbols and can include PSS, SSS and PBCH. In a system that applies beam scanning technology, the SS / PBCH block can be the smallest unit to which beam scanning is applied. The BS can send a maximum of L SS / PBCH blocks (for example, #0 to #L-1) to the terminal, and the L SS / PCH blocks can be transmitted (or mapped) within a half frame (0.5ms). The L SS / PBCH blocks can be repeated according to units of a predetermined period P. The BS can notify the terminal of the period P through specific signaling (for example, a radio resource control (RRC) message). If there is no separate signaling related to the period P from the BS, the terminal can apply a pre-promised (or configured) default value.

[0052] exist Figure 3 In the embodiment of the present invention, beam scanning is applied in units of SS / PBCH blocks over time. The terminal can obtain the best synchronization signal through the beam radiated from the BS to the terminal. For example, the first terminal (UE1) 305 can receive the SS / PCCH block by using the beam radiated in the #d0 direction 303 via the beam forming applied to SS / PBCH block #0 at t1 301. The second terminal (UE2) 306 can receive the SS / PCCH block by using the beam radiated in the #d4 direction 304 via the beam forming applied to SS / PBCH block #4 at t2 302. Therefore, it may be difficult for the first terminal 305 to obtain synchronization information and / or necessary system information from the SS / PBCH block transmitted by the beam radiated in the #d4 direction at a position far away from the first terminal. In this case, the beam radiated in the #d4 direction is radiated in a direction different from the beam that can be received by the first terminal, which may mean that the beam is difficult to be received by the first terminal.

[0053] Even in the process other than the initial access process, the terminal can receive the SS / PBCH block to determine whether the radio link quality of the current cell is maintained at a predetermined level or higher. In addition, the terminal can determine the radio link quality of the neighboring cell in the switching (or handover) process for the terminal to move from the current cell (or serving cell) to the neighboring cell (or target cell), and can receive the SS / PBCH block of the neighboring cell to obtain time / frequency synchronization with the neighboring cell.

[0054] Hereinafter, the initial cell access operation process of the 5G communication system will be described.

[0055] Synchronization is used as a cell search criterion, and a subcarrier spacing suitable for the channel environment (e.g., phase noise) of each frequency band is applied to the synchronization signal to be transmitted. The BS (e.g., gNB) can transmit multiple SSBs to the terminal according to the number of analog beams to be operated by the BS. For example, PSS and SSS can be mapped and transmitted in 12 RBs, and PBCH can be mapped and transmitted in 24 RBs. Hereinafter, the structure of transmitting the synchronization signal and PBCH in the 5G system will be described.

[0056] Figure 4 The SSB considered in the wireless communication system according to an embodiment of the present disclosure is shown.

[0057] refer to Figure 4 , SSB 400 may include PSS 401, SSS 403 and PBCH 402.

[0058] SSB 400 may be mapped to four OFDM symbols 404 in the time domain. PSS 401 and SSS 403 may have a length of 12 RBs 405 in the frequency domain and may be transmitted in the first OFDM symbol and the third OFDM symbol, respectively, in the time domain. For example, in a 5G system, a total of 1008 different cell IDs may be defined. Depending on the physical cell ID (PCI) of the cell, PSS 401 may have three different values ​​and SSS 403 may have 336 different values. The terminal may obtain one of 1008 (336×3) combined cell IDs by detecting PSS 401 and SSS 403. The method by which the terminal obtains one of the 1008 combined cell IDs may be represented by the following equation (1).

[0059] ... (1)

[0061] In equation (1), can be estimated from SSS 403 and can have a value from 0 to 335, and It can be estimated from PSS 401 and can have a value from 0 to 2. The terminal can and The combination of value.

[0062] The PBCH 402 may have a length of 24 RBs 406 in the frequency domain and may be transmitted in the second to fourth OFDM symbols of the SS block in the time domain. The PBCH 402 may have a length of 12 RBs 407 and 408 remaining by excluding the 12 RBs 405 in which the SSS 403 is transmitted from the third OFDM block. The PBCH 402 may include a PBCH payload and / or a PBCH demodulation reference signal (DMRS), and the PBCH payload may include various system information (e.g., MIB). For example, the MIB may include the pieces of information shown in Table 2 below.

[0063] Table 2

[0064] Regarding SSB information, the offset of the SSB in the frequency domain may be indicated by ssb-SubcarrierOffset, which is four bits in the MIB. The terminal may indirectly obtain the index of the SSB including the PBCH by decoding the PBCH DMRS and the PBCH. In an embodiment, in a frequency band below 6 GHz, three bits obtained by decoding the PBCH DMRS may indicate the SSB index, and in a frequency band of 6 GHz or higher, three bits obtained by decoding the PBCH DMDS and three bits included in the PBCH payload and obtained by decoding the PBCH may indicate the index of the SSB including the PBCH.

[0065] Regarding PDCCH configuration information, the subcarrier spacing of the common DL control channel can be indicated by one bit (subCarrierSpacingCommon) in the MIB, and the time-frequency resource information of the control resource set (CORESET) and the search space can be indicated by eight bits (pdcch-ConfigSIB1).

[0066] SFN may be indicated by six bits in MIB. The least significant bit (LSB) of SFN may have a size of four bits, and the LSB may be included in the PBCH payload. Therefore, the terminal may indirectly obtain the LSB through PBCH decoding.

[0067] The timing information in the radio frame may be included in the SSB index and the above-mentioned PBCH payload, may be obtained by PBCH decoding, and may have a size of one bit. The terminal may indirectly identify whether the SSB has been transmitted in the first half frame or the second half frame of the radio frame through the timing information in the radio frame.

[0068] The transmission bandwidth (12 RBs 405) of the PSS 401 and the SSS 403 and the transmission bandwidth (24 RBs 406) of the PBCH 402 are different from each other. Therefore, in the transmission bandwidth of the PBCH 402, the 12 RBs 407 and 408 remaining by excluding the 12 RBs 405 in which the PSS 401 is transmitted may exist in the first OFDM symbol in which the PSS 401 is transmitted. In the first OFDM symbol, the region of the 12 RBs 407 and 408 remaining by excluding the 12 RBs 405 in which the PSS 401 is transmitted may be used to transmit different signals, or may be empty.

[0069] The SSB may be transmitted using the same analog beam. For example, PSS 401, SSS 403, and PBCH 402 may all be transmitted using the same analog beam. Analog beams cannot be applied differently in the frequency domain, and thus the same analog beam may be applied to all RBs in the frequency domain in a specific OFDM symbol in which a specific analog beam is applied. For example, four OFDM symbols in which PSS 401, SSS 403, and PBCH 402 are transmitted may all be transmitted using the same analog beam.

[0070] Figure 5 Various transmission situations of SSB in a frequency band below 6 GHz considered in a communication system according to an embodiment of the present disclosure are shown.

[0071] refer to Figure 5 In a frequency band of 6 GHz or lower in a 5G communication system, a subcarrier spacing 520 of 15 kHz and a subcarrier spacing 530 or 540 of 30 kHz may be used for SSB transmission. Regarding the subcarrier spacing 520 of 15 kHz, there may be a case #1 501 related to SSB, and regarding the subcarrier spacing 530 or 540 of 30 kHz, there may be two transmission cases related to SSB (e.g., case #2 502 and case #3 503).

[0072] In case #1 501 of a subcarrier spacing 520 of 15 kHz, a maximum of two SSBs may be transmitted within a time of 1 ms 504, which corresponds to a time slot length when one time slot is configured by 14 OFDM symbols. In case #1 501, SSB #0 507 and SSB #1 508 are shown. For example, SSB #0 507 may be mapped to four consecutive symbols starting from the third OFDM symbol, and SSB #1 508 may be mapped to four consecutive symbols starting from the ninth OFDM symbol.

[0073] Different analog beams may be applied to SSB#0 507 and SSB#1 508. However, the same analog beam may be applied to the third to sixth OFDM symbols to which SSB#0 507 is mapped. In addition, the same analog beam may be applied to the ninth to twelfth OFDM symbols to which SSB#1 508 is mapped. The BS may determine which analog beam to use in the seventh, eighth, thirteenth, and fourteenth OFDM symbols to which the SSB is not mapped.

[0074] In case #2 502 of a subcarrier spacing 530 of 30 kHz, a maximum of two SSBs may be transmitted within a time of 0.5 ms 505, which corresponds to a length of one slot when one slot is configured by 14 OFDM symbols. Therefore, a maximum of four SSBs may be transmitted within a time of 1 ms, which corresponds to a length of two slots when one slot is configured by 14 OFDM symbols. For example, case #2 502 may indicate that SSB #0 509, SSB #1 510, SSB #2 511, and SSB #3 512 are transmitted within a time of 1 ms (e.g., two slots). SSB #0 509 may be mapped starting from the fifth OFDM symbol of the first slot, and SSB #1 510 may be mapped starting from the ninth OFDM symbol of the first slot. SSB #2 511 may be mapped starting from the third OFDM symbol of the second slot, and SSB #3 512 may be mapped starting from the seventh OFDM symbol of the third slot.

[0075] Different analog beams may be applied to SSB#0 509, SSB#1 510, SSB#2 511, and SSB#3 512. However, the same analog beam may be applied to the fifth to eighth OFDM symbols of the first slot in which SSB#0 509 is transmitted, and the same analog beam may be applied to the ninth to twelfth OFDM symbols in the first slot in which SSB#1 510 is transmitted. In addition, the same analog beam may be applied to the third to sixth symbols of the second slot in which SSB#2 511 is transmitted, and the same analog beam may be applied to the seventh to tenth symbols of the second slot in which SSB#3 512 is transmitted. The BS may determine which analog beam to use in an OFDM symbol to which an SSB is not mapped.

[0076] In case #3 503 of a subcarrier spacing 540 of 30 kHz, a maximum of two SSBs may be transmitted within a time of 0.5 ms 506, which corresponds to a length of one slot when one slot is configured by 14 OFDM symbols. Therefore, a maximum of four SSBs may be transmitted within a time of 1 ms, which corresponds to a length of two slots when one slot is configured by 14 OFDM symbols. For example, case #3 503 may indicate that SSB #0 513, SSB #1 514, SSB #2 515, and SSB #3 516 are transmitted within a time of 1 ms (i.e., two slots). SSB #0 513 may be mapped starting from the third OFDM symbol of the first slot, SSB #1 514 may be mapped starting from the ninth OFDM symbol of the first slot, SSB #2 515 may be mapped starting from the first OFDM symbol of the second slot, and SSB #3 516 may be mapped starting from the ninth OFDM symbol of the second slot.

[0077] Different analog beams may be used for SSB#0 513, SSB#1 514, SSB#2 515, and SSB#3 516. However, the same analog beam may be applied to the third to sixth OFDM symbols of the first slot in which SSB#0 513 is transmitted, and the same analog beam may be applied to the ninth to twelfth OFDM symbols of the first slot in which SSB#1 514 is transmitted. In addition, the same analog beam may be applied to the third to sixth symbols of the second slot in which SSB#2 515 is transmitted, and the same analog beam may be applied to the ninth to twelfth symbols of the second slot in which SSB#3 516 is transmitted. The BS may determine which analog beam to use in an OFDM symbol to which an SSB is not mapped.

[0078] Figure 6 A transmission situation of SSB in a frequency band of 6 GHz or higher considered in a wireless communication system according to an embodiment of the present disclosure is shown.

[0079] refer to Figure 6 , in a frequency band of 6 GHz or higher in a 5G system, a subcarrier spacing 630 of 120 kilohertz (kHz) in case #4 610 and a subcarrier spacing 640 of 240 kHz in case #5 620 may be used for SSB transmission.

[0080] In case #4 610 of a subcarrier spacing 630 of 120 kHz, a maximum of four SSBs may be transmitted within a time of 0.25 ms 601, which corresponds to a length of two time slots when one time slot is configured by 14 OFDM symbols. Case #4 610 may indicate that SSB #0 603, SSB #1 604, SSB #2 605, and SSB #3 606 are transmitted within a time of 0.25 ms (e.g., two time slots). SSB #0 603 may be mapped to four consecutive symbols starting from the fifth OFDM symbol of the first time slot, and SSB #1 604 may be mapped to four consecutive symbols starting from the ninth OFDM symbol of the first time slot. In addition, SSB #2 605 may be mapped to four consecutive symbols starting from the third OFDM symbol of the second time slot, and SSB #3 606 may be mapped to four consecutive symbols starting from the seventh OFDM symbol of the second time slot.

[0081] Different analog beams may be used for SSB#0 603, SSB#1 604, SSB#2 605, and SSB#3 606. However, the same analog beam may be used for four OFDM symbols in which each SSB is transmitted. The BS may determine which beam to use in an OFDM symbol to which an SSB is not mapped.

[0082] In case #5 620 of a subcarrier spacing 640 of 240 kHz, a maximum of eight SSBs may be transmitted within a time of 0.25 ms 602, which corresponds to a length of four time slots when one time slot is configured by 14 OFDM symbols. This case may indicate that SSB #0 607, SSB #1 608, SSB #2 609, SSB #3 610, SSB #4 611, SSB #5 612, SSB #6 613, and SSB #7 614 are transmitted within a time of 0.25 ms (e.g., four time slots).

[0083] SSB#0 607 may be mapped to four consecutive symbols starting from the ninth OFDM symbol of the first slot, and SSB#1 608 may be mapped to four consecutive symbols starting from the thirteenth OFDM symbol of the first slot. SSB#2 609 may be mapped to four consecutive symbols starting from the third OFDM symbol of the second slot, and SSB#3 610 may be mapped to four consecutive symbols starting from the seventh OFDM symbol of the second slot. SSB#4 611 may be mapped to four consecutive symbols starting from the fifth OFDM symbol of the third slot, SSB#5 612 may be mapped to four consecutive symbols starting from the ninth OFDM symbol of the third slot, and SSB#6 613 may be mapped to four consecutive symbols starting from the thirteenth OFDM symbol of the third slot. SSB#7 614 may be mapped to four consecutive symbols starting from the third OFDM symbol of the fourth slot.

[0084] Different analog beams may be used for SSB#0 607, SSB#1 608, SSB#2 609, SSB#3 610, SSB#4 611, SSB#5 612, SSB#6 613, and SSB#7 614, respectively. The same analog beam may be used for four OFDM symbols in which each SSB is transmitted. The BS may determine which analog beam to use in an OFDM symbol to which an SSB is not mapped.

[0085] Figure 7 The transmission situation of SSB according to the subcarrier spacing of 5 ms in a wireless communication system according to an embodiment of the present disclosure is shown.

[0086] refer to Figure 7 , in a 5G system, the SSB may be periodically transmitted in units of a 5 ms time interval 710 (which corresponds to five subframes or one half frame).

[0087] In frequency bands at 3 GHz or lower, up to four SSBs may be transmitted in a 5 ms time 710. In frequency bands from 3 GHz (exclusive) to 6 GHz (inclusive), up to eight SSBs may be transmitted. In frequency bands above 6 GHz, up to 64 SSBs may be transmitted. Subcarrier spacings of 15 kHz and 30 kHz may be used at frequencies of 6 GHz or lower.

[0088] In reference Figure 5In the case #1 501 of configuring a subcarrier spacing of 15 kHz in one time slot, an SSB in a frequency band of 3 GHz or less can be mapped to the first time slot and the second time slot, and thus the maximum length (L) that can be transmitted is four SSBs 721. An SSB in a frequency band of 3 GHz (exclusive) to 6 GHz (inclusive) can be mapped to the first time slot, the second time slot, the third time slot, and the fourth time slot, and thus a maximum of eight SSBs 722 can be transmitted. In reference Figure 5 In the described case #2 502 or case #3 503 of configuring the subcarrier spacing of 30 kHz of two time slots, the SSB in the 3 GHz or lower band can be mapped starting from the first time slot, and thus a maximum of four SSBs 731 or 741 can be transmitted. The SSB in the frequency band of 3 GHz (exclusive) to 6 GHz (inclusive) can be mapped starting from the first time slot and the third time slot, and thus a maximum of eight SSBs 732 or 742 can be transmitted.

[0089] At frequencies above 6 GHz, subcarrier spacings of 120 kHz and 240 kHz may be used. Figure 6 In the described case #4 610 of configuring a subcarrier spacing of 120 kHz with two time slots, SSBs in a frequency band exceeding 6 GHz can be mapped starting from the 1st time slot, the 3rd time slot, the 5th time slot, the 7th time slot, the 11th time slot, the 13th time slot, the 15th time slot, the 17th time slot, the 21st time slot, the 23rd time slot, the 25th time slot, the 27th time slot, the 31st time slot, the 33rd time slot, the 35th time slot, and the 37th time slot, and thus a maximum of 64 SSBs 751 can be transmitted. In reference Figure 6 In the described case #5 620 of configuring four time slots with a subcarrier spacing of 240 kHz, SSBs in a frequency band exceeding 6 GHz can be mapped starting from the 1st time slot, the 5th time slot, the 9th time slot, the 13th time slot, the 21st time slot, the 25th time slot, the 29th time slot and the 33rd time slot, and thus a maximum of 64 SSBs 761 can be transmitted.

[0090] The terminal may decode the PDCCH and the PDSCH based on the system information included in the MIB received from the BS and then obtain the SIB. The SIB may include at least one of UL cell bandwidth related information, random access parameters, paging parameters, or parameters related to UL power control.

[0091] Typically, the terminal can establish a wireless link with the network through a random access process based on the system information obtained in the cell search process for the cell and synchronization with the network. A contention-based scheme or a contention-free scheme can be used for random access. For example, when the terminal performs cell selection and reselection in the initial cell access phase, a contention-based random access scheme can be used to transition from the RRC_IDLE state to the RRC_CONNECTED state. Contention-free random access can be used to reconfigure UL synchronization when DL data arrives, for switching or positioning. Table 3 below may include conditions (events) for triggering a random access process in a 5G system.

[0092]

[0093] Table 3

[0094] In the following, a measurement time configuration method for SSB-based radio resource management (RRM) in a 5G communication system is described. The MeasObjectNR of MeasObjectToAddModList can be configured for the terminal through high-level signaling (e.g., RRC message) as a configuration of intra-frequency / inter-frequency signal measurement based on SSB (intra-frequency / inter-frequency measurement) and intra-frequency / inter-frequency measurement based on channel state information reference signal (CSI-RS). For example, MeasObjectNR can be configured as shown in Table 4 below.

[0095] Table 4

[0096] ssbFrequency can configure the frequency of the synchronization signal associated with MeasObjectNR.

[0097] ssbSubcarrierSpacing can configure the subcarrier spacing of SSB. In FR1, only 15 kHz or 30 kHz is applicable, and in FR2, only 120 kHz or 240 kHz is applicable.

[0098] smtc1 indicates the SS / PBCH block measurement timing configuration, and can configure the main measurement timing configuration and configure the timing offset and duration of the SSB.

[0099] smtc2 configures the secondary measurement timing configuration for SSBs associated with MeasObjectNR with the PCI listed in pci-List.

[0100] SMTC can also be configured through different high-level signaling. For example, for intra-frequency, inter-frequency or inter-radio access technology (RAT) cell reselection or reconfigurationWithSync for NR Pcell change, SMTC can also be configured for the terminal through SIB2. Alternatively, for NR SCell addition, SMTC can be configured for the terminal through SCellConfig.

[0101] The BS may configure the first SS / PBCH block measurement timing configuration (SMTC) for the terminal for SSB measurement according to periodicityAndOffset (eg, providing period and offset) through smtc1 configured via higher layer signaling. The first subframe of each SMTC opportunity may start at a subframe of the SPCell and SFN that satisfies the conditions shown in Table 5 below.

[0102] Table 5

[0103] If smtc2 is configured, the terminal can configure additional SMTCs for the cell indicated by the pci-List value of smtc2 in the same MeasObjectNR according to the offset and duration of smtc1 and the period (periodicity) of the configured smtc2. Alternatively, the base station can configure smtc to smtc2-LP and smtc3list for the terminal for integrated access and backhaul-mobile terminal (IAB-MT), and the terminal can measure SSB through smtc. smtc2-LP is used for the same frequency (e.g., the frequency used for intra-frequency cell reselection) or different frequencies (e.g., the frequency used for inter-frequency cell reselection) and can have a periodicity. Depending on the ssbFrequency configured by the base station, the terminal may not consider SSBs transmitted in subframes other than SMTC opportunities for SSB-based RRM measurements.

[0104] The base station can use various multiple transmission / reception point (TRP) operation methods according to the serving cell configuration and PCI configuration. When two TRPs located physically far from each other have different PCIs, there may be two methods to operate the two TRPs.

[0105] Method 1

[0106] Two TRPs with different PCIs can be operated through two serving cell configurations.

[0107] The base station can configure channels and signals transmitted from different TRPs to be included in different service cell configurations through method 1. That is, each TRP can have an independent service cell configuration, and the value of FrequencyInfoDL indicating the frequency band value indicated by DLConfigCommon in each service cell configuration can indicate frequency bands that at least partially overlap with each other. Multiple TRPs operate based on multiple values ​​of ServCellIndex (for example, ServCellIndex #1 and ServCellIndex #2), and thus each TRP can use a separate PCI. That is, the base station can assign a PCI for each ServCellIndex.

[0108] In the case where one PCI is assigned to each ServCellIndex, when multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs may have different PCIs (e.g., PCI #1 and PCI #2), and the base station may correctly select the ServCellIndex value indicated as a cell parameter in Quasi Co-location (QCL)-Info and map the PCI suitable for each TRP to the value, and may designate the SSB transmitted from one of TRP 1 or TRP 2 as the source RS of the QCL configuration information. However, the above configuration indicates that one serving cell configuration of carrier aggregation (CA) available for a terminal is applied to multiple TRPs, and thus the degree of freedom of CA configuration may be limited or the signaling burden may increase.

[0109] Method 2

[0110] Two TRPs with different PCIs can be operated through one service cell configuration.

[0111] The base station can configure channels and signals transmitted from different TRPs via one serving cell configuration through method 2. The terminal operates based on one ServCellIndex value (e.g., ServCellIndex #1), and therefore may not be able to identify the PCI assigned to the second TRP (e.g., PCI #2). Compared with the above-mentioned method 1, method 2 may have the freedom of CA configuration. However, when multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs may have different PCIs (e.g., PCI #1 and PCI #2), and the base station may not be able to map PCI #2 of the second TRP through ServCellIndex indicated as a cell parameter in QCL-Info. The base station may only be able to specify the SSB transmitted from TRP 1 as the source RS of the QCL configuration information, and may not be able to specify the SSB transmitted from TRP 2.

[0112] Method 1 can perform multi-TRP operation for two TRPs with different PCIs through additional service cell configuration without additional specification support. However, Method 2 can operate based on the additional terminal capability report and base station configuration information described below.

[0113] Related to terminal capability reporting for Method 2: The terminal may transmit a terminal capability report to the base station, the terminal capability report indicating that configuration of an additional PCI other than the PCI of the serving cell configured by higher layer signaling (e.g., RRC message) received from the base station is possible. The two independent numbers X1 and X2 may be included in one terminal capability report, or may be transmitted to the base station by an independent terminal capability report.

[0114] X1 may represent the maximum number of additional PCIs that can be configured for the terminal, and the additional PCI may be different from the PCI of the serving cell. The time domain position and period of the SSB corresponding to the additional PCI may be the same as the time domain position and period of the SSB of the serving cell.

[0115] X2 may represent the maximum number of additional PCIs that may be configured for the terminal, and the additional PCI may be different from the PCI of the serving cell. The time domain position and period of the SSB corresponding to the additional PCI may be different from the time domain position and period of the SSB corresponding to the PCI reported as X1.

[0116] Based on the above definitions of X1 and X2, it may be difficult to simultaneously configure the PCIs corresponding to the values ​​reported as X1 and X2.

[0117] X1 and X2 included in the terminal capability report may be integers between 0 and 7, and may have different values ​​in FR1 and FR2.

[0118] Related to the higher layer signaling configuration for method 2: SSB-MTCAdditionalPCI-r17 may be configured for the terminal through high-layer signaling (e.g., RRC message) based on the above-mentioned terminal capability report. - High-layer signaling (e.g., RRC message) may include multiple additional PCIs different from the PCI of at least one serving cell, SSB transmit power corresponding to each additional PCI, and ssb-PositionInBurst corresponding to each additional PCI, and up to seven additional PCIs may be configured.

[0119] The terminal may assume that the SSB corresponding to the additional PCI different from the PCI of the same serving cell has the same center frequency, subcarrier spacing and subframe number offset as the SSB of the serving cell.

[0120] The terminal may assume that the RS (e.g., SSB or CSI-RS) corresponding to the PCI of the serving cell is always associated with the activated TCI state, and when an additional PCI different from the PCI of the serving cell is configured, only one PCI among the one or more additional PCIs is associated with the activated TCI state.

[0121] When two different coresetPoolIndex are configured for the terminal, the RS corresponding to the PCI of the serving cell is associated with one or more activated TCI states and the RS corresponding to the additionally configured PCI different from the PCI of the same serving cell is associated with one or more activated TCI states, the terminal may expect that the activated TCI state associated with the PCI of the serving cell can be associated with one of the two different coresetPoolIndex, and the activated TCI state associated with the additionally configured PCI different from the PCI of the same serving cell is associated with the remaining coresetPoolIndex.

[0122] The terminal capability report and high-layer signaling (e.g., RRC message) of the base station used for the above-mentioned method 2 may include the configuration of an additional PCI that is different from the PCI of the serving cell. When there is no configuration for the additional PCI, an SSB corresponding to the additional PCI that is different from the PCI of the same serving cell (which cannot be designated as the source RS) may be used to be designated as the source RS of the QCL configuration information. In addition, unlike the SSB that may be configured for RRM, mobility, or switching, the SSB corresponding to the additional PCI may be used to serve as a QCL source RS to support the operation of multiple TRPs with different PCIs, similar to the configuration information on the SSB in smtc1 and smtc2 that may be included in high-layer signaling (e.g., RRC message).

[0123] DMRS can be configured by multiple DMRS ports, and each port can maintain orthogonality by using code division multiplexing (CDM) or frequency division multiplexing (FDM) to avoid mutual interference. However, depending on the user's intention and the purpose of using the reference signal, the term DMRS can be replaced with different terms. The term DMRS corresponds to a specific example in order to easily describe the technical content of the present disclosure, and is not intended to limit the scope of the present disclosure.

[0124] Figure 8 The DMRS pattern used for communication between a base station and a terminal in a 5G system according to an embodiment of the present disclosure is shown. Two DMRS patterns (eg, type 1 and type 2) may be supported in a 5G system.

[0125] refer to Figure 8, reference numerals 801 and 802 may correspond to DMRS type 1, reference numeral 801 indicates a 1-symbol mode, and reference numeral 802 may indicate a 2-symbol mode. DMRS type 1 of reference numerals 801 and 802 corresponds to a DMRS pattern having a comb-2 structure, and may be configured by two CDM groups, and different CDM groups may perform FDM. Comb indicates a method of mapping DMRS to a resource block, and indicates that DMRS configured by the same DMRS port is mapped to a subcarrier with a predetermined gap. For example, comb 2 may mean configuring 2 as a subcarrier index difference in DMRS configured by the same DMRS port (for example, a DMR configured by DMRS port 0 is located in subcarrier indices 0, 2, 4, 6, 8, and 10).

[0126] In 1-symbol mode 801, CDM can be applied to the same CDM group in the frequency domain so that two DMRS ports can be distinguished and a total of four orthogonal DMRS ports can be configured. 1-symbol mode 801 may include a DMRS port ID mapped to each CDM group. For example, the DMRS port ID for DL ​​can be represented by the number +1000 shown. In 2-symbol mode 802, CDM can be applied to the same CDM group in the time domain / frequency domain so that four DMRS ports can be distinguished and a total of eight orthogonal DMRS ports can be configured. 2-symbol mode 802 may include a DMRS port ID mapped to each CDM group. For example, the DMRS port ID for DL ​​can be represented by the number +1000 shown.

[0127] DMRS type 2 indicated by reference numerals 803 and 804 corresponds to a DMRS pattern having a structure in which a frequency domain orthogonal cover code (FD-OCC) is applied to adjacent subcarriers in the frequency domain, and may be configured by three CDM groups. Different CDM groups may perform FDM.

[0128] In 1-symbol mode 803, CDM can be applied to the same CDM group in the frequency domain so that two DMRS ports can be distinguished and a total of six orthogonal DMRS ports can be configured. 1-symbol mode 803 may include a DMRS port ID mapped to each CDM group. For example, the DMRS port ID for DL ​​can be represented by the number +1000 shown. In 2-symbol mode 804, CDM can be applied to the same CDM group in the time domain / frequency domain so that four DMRS ports can be distinguished and a total of 12 orthogonal DMRS ports can be configured. 2-symbol mode 804 may include a DMRS port ID mapped to each CDM group. For example, the DMRS port ID for DL ​​can be represented by the number +1000 shown.

[0129] As described above, in the 5G system, DMRS patterns 801 and 802 or DMRS patterns 803 and 804 may be configured, and each DMRS pattern may also be configured to be a 1 (one)-symbol pattern 801 or 803 or an adjacent 2 (two)-symbol pattern 802 or 804. In addition, in the 5G system, a DMRS port number is scheduled, and the number of CDM groups scheduled together for PDSCH rate matching may be configured (or signaled). In cyclic prefix-based orthogonal frequency division multiplexing (CP-OFDM), the above two DMRS patterns may be supported in DL and UL, while in discrete Fourier transform spread OFDM (DFT-S-OFDM), only DMRS type 1 in the above DMRS pattern may be supported in UL.

[0130] The 5G system may support configurable additional DMRS. The frontload DMRS may indicate the first DMRS transmitted or received in the frontmost symbol in the time domain in the DMRS, and the additional DMRS may indicate the DMRS transmitted and / or received in the symbol after the frontload DMRS in the time domain. In the 5G system, the number of additional DMRS may be configured to be one of 0 to 3. When the additional DMRS is configured, the additional DMRS may have the same pattern as the frontload DMRS. When information related to whether the described DMRS pattern type is type 1 or type 2, information related to whether the DMRS pattern is a 1-symbol mode or an adjacent 2-symbol mode, and information about the number of CDM groups used with the DMRS port is indicated for the frontload DMRS, when the additional DMRS is configured, the same DMRS information as the frontload DMRS can be configured for the additional DMRS.

[0131] The DL DMRS configuration as described above may be configured through higher layer signaling (eg, RRC message), as shown in Table 6 below.

[0132] Table 6

[0133] In Table 6, dmrs-Type may include configuration information about the DMRS type, dmrs-AdditionalPosition may include configuration information about the additional DMRS OFDM symbol, maxLength may include configuration information about the 1-symbol DRMS ​​mode or the 2-symbol DMRS mode, scramblingID0 and scramblingID1 may include configuration information about the scrambling ID, and phaseTrackingRS may include configuration information about the phase tracking reference signal (PTRS).

[0134] In addition, the UL DMRS configuration described above may be configured through higher layer signaling (eg, RRC message), as shown in Table 7 below.

[0135] Table 7

[0136] In Table 7, dmrs-Type may include configuration information about the DMRS type, dmrs-AdditionalPosition may include configuration information about additional DMRS OFDM symbols, phaseTrackingRS may include configuration information about PTRS, and maxLength may include configuration information about 1-symbol DRMS ​​mode or 2-symbol DMRS mode. scramblingID0 and scramblingID1 may include configuration information about scrambling ID0, nPUSCH-Identity may include configuration information about a cell ID for DFT-s-OFDM, sequenceGroupHopping may disable sequence group hopping, and sequenceHopping may enable sequence hopping.

[0137] Fig. 9 An example of performing channel estimation using a DMRS received in a PUSCH in a time band of a 5G system according to an embodiment of the present disclosure is shown.

[0138] refer to Fig. 9 , when performing channel estimation for data decoding using DMRS, channel estimation can be performed in a precoding resource block group (PRG) as a bundling unit by using bundling of physical resource blocks (PRBs) linked to the system band in the frequency domain. In the time domain, channel estimation can be performed only for DMRS received in one PUSCH assuming that precoding is the same.

[0139] Hereinafter, a time domain resource allocation (TDRA) method for a data channel in a 5G system will be described. The BS may configure a table related to time domain resource allocation information for a downlink data channel (eg, PDSCH) and an uplink data channel (eg, PUSCH) for the UE through high-layer signaling (eg, RRC message).

[0140] The BS may configure a table configured with a maximum of 17 (e.g., maxNrofDL-Allocations is equal to 17) entries for the PDSCH, and may configure a table configured with a maximum of 17 (e.g., maxNrofUL-Allocations is equal to 17) entries for the PUSCH. For example, the time domain resource allocation information may include at least one of: PDCCH-to-PDSCH slot timing (corresponding to the time interval expressed in time slots between the reception time point of the PDCCH and the transmission time point of the PDSCH scheduled by the received PDCCH, the timing being indicated by K0); or PDCCH-to-PUSCH slot timing (corresponding to the time interval expressed in time slots between the reception time point of the PDCCH and the transmission time point of the PUSCH scheduled by the received PDCCH, the timing being indicated by K2); information about the length and starting symbol position of the PDSCH or PUSCH scheduled in the slot; and a mapping type of the PDSCH or PUSCH. The PDCCH-to-PDSCH slot timing may be expressed in units of a time slot between a reception time point of the PDCCH and a transmission time point of the PDSCH scheduled by the received PDCCH, and may be represented by K0. The PDCCH-to-PUSCH slot timing may be expressed in units of a time slot between a reception time point of the PDCCH and a transmission time point of the PUSCH scheduled by the received PDCCH, and may be represented by K2.

[0141] The time domain resource allocation information for PDSCH may be configured for the terminal through high-layer signaling (eg, RRC message), as shown in Table 8 below.

[0142] Table 8

[0143] In Table 8, k0 may represent PDCCH-to-PDSCH timing in slots (e.g., the slot offset between the DCI and the scheduled PDSCH), mappingType may represent the PDSCH mapping type, startSymbolAndLength may represent the starting symbol and length of the PDSCH, and repetitionNumber may represent the number of PDSCH transmission opportunities according to a slot-based repetition scheme.

[0144] The time domain resource allocation information for PUSCH may be configured for the terminal through high-layer signaling (eg, RRC message), as shown in Table 9 below.

[0145] Table 9

[0146] In Table 9, k2 may represent the PDCCH-to-PUSCH timing in slots (e.g., the slot offset between the DCI and the scheduled PUSCH), mappingType may represent the PUSCH mapping type, startSymbolAndLength or StartSymbol and length may represent the starting symbol and length of the PUSH, and numberOfRepetitions may represent the number of repetitions applied to the PUSCH transmission.

[0147] The BS may indicate at least one of the entries of the table related to the time domain resource allocation information to the terminal through L1 signaling (e.g., downlink control information (DCI)). For example, the BS may indicate at least one of the entries of the table related to the time domain resource allocation information to the terminal by using the time domain resource allocation field in the DCI. The terminal may obtain the time domain resource allocation information for the PDSCH or PUSCH based on the L1 signaling (e.g., DCI) received from the BS.

[0148] PUSCH transmission may be dynamically scheduled by a UL grant in the DCI (e.g., dynamic grant (DG)-PUSCH), or may be scheduled by a configuration grant type 1 or a configuration grant type 2 (e.g., configuration grant (CG)-PUSCH). For example, dynamic scheduling of PUSCH transmission may be indicated by DCI format 0_0 or 0_1.

[0149] PUSCH transmission configured with grant type 1 can be semi-persistently scheduled by configuredGrantConfig (including rrc-ConfiguredUplinkGrant shown in Table 10 below) included in higher layer signaling (e.g., RRC message) without receiving UL grant in DCI. PUSCH transmission configured with grant type 2 can be semi-persistently scheduled by UL grant in DCI after the terminal receives configuredGrantConfig not including rrc-ConfiguredUplinkGrant in Table 10 from the BS through higher layer signaling (e.g., RRC message).

[0150] When PUSCH transmission is scheduled by configuring a grant, parameters applied to PUSCH transmission may be configured by configuredGrantConfig in higher layer signaling (e.g., RRC message) of Table 10, except for specific parameters (e.g., dataScramblingIdentityPUSCH, txConfig, codebookSubset, maxRank, and scaling of UCI-OnPUSCH) provided as pusch-Config in Table 11 in higher layer signaling (e.g., RRC message). For example, when transformPrecoder in configuredGrantConfig as higher layer signaling (e.g., RRC message) of Table 10 is provided to the terminal, the terminal may apply tp-pi2BPSK in pusch-Config of the following Table 11 to PUSCH transmission operated by configuring a grant.

[0151] Table 10

[0152] The DRMS ​​antenna port used for PUSCH transmission may be the same as the antenna port used for SRS transmission. The PUSCH transmission method may be classified as a codebook-based transmission method or a non-codebook-based transmission method according to whether the value of txConfig in pusch-Config as high-layer signaling (e.g., RRC message) of Table 7 is "codebook" or "nonCodebook". As described above, PUSCH transmission may be dynamically scheduled by DCI format 0_0 or 0_1, or may be semi-statically scheduled by configuring a grant.

[0153] If the BS indicates to the terminal through DCI format 0_0 that PUSCH transmission is scheduled, the terminal can perform beam configuration for PUSCH transmission by using the pucch-spatialRelationInfoID corresponding to the terminal (UE)-specific (dedicated) PUCCH resource with the lowest ID in the UL bandwidth part (BWP) activated in the serving cell. PUSCH transmission can be performed based on a single antenna port and may not be scheduled for the terminal through DCI format 0_0 within a BWP in which PUCCH resources including pucch-spatialRelationInfo are not configured. When txConfig in pusch-Config of the following Table 11 is not configured for the terminal, PUSCH transmission may not be scheduled for the terminal through DCI format 0_1.

[0154] Table 11

[0155] Codebook-based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, or can be semi-statically scheduled by configuring a grant. If dynamic scheduling is performed through codebook-based PUSCH DCI format 0_1, or semi-static scheduling is performed by configuring a grant, the terminal can determine the precoder for PUSCH transmission based on the SRS resource indicator (SRI), the transmit precoding matrix indicator (TPMI), and the transmission level (e.g., the number of PUSCH transmission layers).

[0156] SRI can be indicated by an SRS resource indicator as a field in DCI, or can be configured by srs-ResourceIndicator as high-level signaling (e.g., RRC message). When the terminal performs codebook-based PUSCH transmission, at least one SRS resource can be configured for the terminal. For example, up to two SRS resources can be configured for the terminal. When the BS indicates SRI to the terminal through DCI, the SRS resource indicated by the indicated SRI can indicate the SRS resource corresponding to the SRI in the SRS resource transmitted before the PDCCH including the indicated SR. TPMI and transmission level can be indicated by precoding information and the number of layers as fields in DCI, can be configured by precodingAndNumberOfLayers of high-level signaling (e.g., RRC message), and can be used to indicate the precoder applied to PUSCH transmission.

[0157] A precoder to be used for PUSCH transmission may be selected in a UL codebook having a number of antenna ports corresponding to a value of nrofSRS-Ports in SRS-Config of a higher-layer signaling (e.g., an RRC message). In codebook-based PUSCH transmission, the terminal may determine the codebook subset based on TPMI and codebookSubset in pusch-Config of a higher-layer signaling (e.g., an RRC message). The codebookSubset in pusch-Config of the higher-layer signaling (e.g., an RRC message) may be configured as one of the following based on a UE capability report transmitted by the terminal to the BS: fullyAndPartialAndNonCoherent, partialAndNonCoherent or nonCoherent.

[0158] If the terminal has reported partialAndNonCoherent through the terminal capability report, the value of codebookSubset of the higher-layer signaling (e.g., RRC message) may not be configured as fullyAndPartialAndNonCoherent. In addition, if the terminal has reported nonCoherent as a terminal capability report, the value of codebookSubset of the higher-layer signaling (e.g., RRC message) may not be configured as fullyAndPartialAndNonCoherent or partialAndNonCoherent. If nrofSRS-Ports in the SRS-ResourceSet of the higher-layer signaling (e.g., RRC message) indicates two SRS antenna ports, the value of codebookSubset of the higher-layer signaling (e.g., RRC message) may not be configured as partialAndNonCoherent.

[0159] An SRS resource set in which the codebook is configured as a used value in the SRS-ResourceSet of the higher-level signaling (e.g., RRC message) may be configured for the terminal, and an SRS source in the SRS resource set configured for the terminal may be indicated by SRI. If multiple SRS resources are configured in the SRS resource set in which the codebook is configured as a used value in the SRS-ResourceSet of the higher-level signaling (e.g., RRC message), the value of nrofSRS-Ports in the SRS-Resource of the higher-level signaling (e.g., RRC message) may be configured to be the same for all SRS resources.

[0160] The terminal may transmit one or more SRS resources included in an SRS resource set of values ​​in which the codebook is configured to be used according to high-level signaling (e.g., an RRC message) to the BS. The BS may select one of the SRS resources transmitted by the terminal, and may instruct the terminal to perform PUSCH transmission by using the transmission beam information of the selected SRS resource. In codebook-based PUSCH transmission, SRI may be used as information for selecting an index of an SRS resource, and may be included in the DCI. Additionally, the BS may include information indicating the TPMI and rank to be used by the terminal for PUSCH transmission in the DCI, and transmit the DCI and the information to the terminal. The terminal may use the SRS resource indicated by the SRI, and apply the precoder indicated by the TPMI and the rank indicated by the DCI based on the transmission beam of the indicated SRS resource, so as to perform PUSCH transmission.

[0161] Non-codebook based PUSCH transmission can be dynamically scheduled through DCI format 0_0 or 0_1, or can be semi-statically scheduled by configuring the grant. When at least one SRS resource is configured in the SRS resource set in which nonCodebook is configured as the used value in the SRS-ResourceSet of the higher layer signaling (e.g., RRC message), the BS can schedule non-codebook based PUSCH transmission for the terminal through DCI format 0_1.

[0162] For an SRS resource set in which nonCodebook is configured as the used value in the SRS-ResourceSet of the higher layer signaling (e.g., RRC message), the BS may configure a non-zero power (NZP) CSI-RS resource associated with one SRS resource set for the terminal. The terminal may perform calculation of the precoder for SRS transmission by measuring the NZP CSI-RS resource configured in association with the SRS resource set. When the difference between the first symbol of the aperiodic SRS transmission performed by the terminal and the last received symbol of the aperiodic NZP CSI-RS resource associated with the SRS resource set is less than a specific symbol (e.g., 42 symbols), the information about the precoder for SRS transmission may not be updated.

[0163] If aperiodicity is configured as the value of resourceType in SRS-ResourceSet of higher layer signaling (e.g., RRC message), the NZP CSI-RS associated with the SRS-ResourceSet may be indicated by an SRS request as a field in DCI format 0_1 ​​or 1_1. When the NZP CSI-RS resource associated with the SRS-ResourceSet is an aperiodic NZP CSI resource, and the value of the SRS request as a field in DCI format 0_1 ​​or 1_1 is not 00, the numerical value of the SRS request may indicate the presence of NSP CSI-RS associated with the SRS-ResourceSet. The DCI may not indicate cross-carrier or cross-BWP scheduling. When the value of the SRS request indicates the presence of NZP CSI-RS, the NZP CSI-RS may be located in the time slot in which the PDCCH including the SRS request field is transmitted. The TCI state configured for the scheduled subcarriers may not be configured as QCL-TypeD.

[0164] When configuring a periodic or semi-persistent SRS resource set, the NZP CSI-RS associated with the SRS resource set can be configured for the terminal through the associatedCSI-RS in the SRS-ResourceSet of the higher layer signaling (e.g., RRC message). In non-codebook based transmission, the associatedCSI-RS in the SRS-ResourceSet of the higher layer signaling (e.g., RRC message) for the SRS resources and spatialRelationInfo may not be configured together.

[0165] When multiple SRS resources are configured for the terminal, the terminal can determine the precoder and transmission level to be applied to the PUSCH transmission based on the SRI indicated by the BS. The SRI can be indicated by the SRS resource indicator as a field in the DCI, or can be configured by the srs-ResourceIndicator of the higher-level signaling (e.g., RRC message). Similar to the above-mentioned codebook-based PUSCH transmission, when the SRI is indicated to the terminal through the DCI, the SRS resource indicated by the SRI can indicate the SRS resource corresponding to the SRI in the SRS resource transmitted before the PDCCH including the indicated SR. The terminal can use one or more SRS resources for SRS transmission, and the maximum number of SRS resources that can be jointly transmitted in the same symbol in one SRS resource set can be determined by the terminal capability report transmitted by the terminal to the BS. The SRS resources that the terminal can jointly transmit can include the same RB. The terminal can configure an SRS port for each SRS resource. Only one SRS resource set may be configured as an SRS resource set in which nonCodebook is configured as the used value in SRS-ResourceSet of higher layer signaling (eg, RRC message), and a maximum of four SRS resources for non-codebook based PUSCH transmission may be configured.

[0166] The BS may transmit an NZP CSI-RS associated with an SRS resource set to the terminal, and the terminal may calculate a precoder to be used when sending one or more SRS resources in the SRS resource set based on a measurement result performed when receiving the NZP CSI-RS. The terminal may apply the calculated precoder when transmitting one or more SRS resources in the SRS resource set in which nonCodebook is configured to be used to the BS, and the BS may select one or more SRS resources from one or more SRS sources received from the terminal. In non-codebook-based PUSCH transmission, SRI may indicate an index that can represent an SRS resource or a combination of multiple SRS resources, and the SRI may be included in the DCI. The number of SRS resources indicated by the SRI transmitted by the BS may be the number of PUSCH transmission layers, and the terminal may apply the precoder applied to the SRS resource transmission to each layer to transmit the PUSCH.

[0167] The 5G system may support PUSCH repetition transmission type A and PUSCH repetition transmission type B for UL data channels, and TB processing (TBoMS) on multi-slot PUSCH for transmitting TBs through multiple PUSCHs on multiple slots. In addition, the BS may configure one of PUSCH repetition transmission types A or B for the terminal through high-layer signaling (e.g., RRC message), and may configure numberOfSlotsTBoMS through a resource allocation table. The terminal may transmit TBoMS through the configured resource allocation table.

[0168] PUSCH repetitive transmission type A

[0169] The starting symbol and length of the UL data channel can be determined by a time domain resource allocation method in one time slot, and the BS can transmit the number of repeated transmissions to the terminal through high-layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The number of time slots N configured by numberOfSlotsTBoMS determined for TBS can be 1.

[0170] The terminal may repeatedly transmit a UL data channel having the same starting symbol and the same length as the UL data channel configured by the BS in consecutive time slots based on the number of repeated transmissions received from the BS. When at least one of the symbols of the time slot configured by the BS as DL for the terminal or the time slot for repeated transmission of the UL data channel is configured as DL, the terminal may omit the UL data channel transmission in the time slot configured by the BS as DL for the terminal or the time slot for repeated transmission of the UL data channel. For example, the terminal may not transmit the UL data channel within the number of repeated transmissions of the UL data channel. However, a terminal supporting 3GPP Release 17 (Rel-17) UL data repeated transmission may determine the time slot in which the UL data repeated transmission may be performed as an available time slot, and when the UL data channel is repeatedly transmitted in the time slot determined as the available time slot, the number of transmissions may be counted. When the repeated transmission of the UL data channel is omitted in the time slot determined as the available time slot, the repeated transmission of the UL data channel may be postponed, and then the UL data channel may be repeatedly transmitted in the time slot in which the transmission may be performed. In the following Table 12, a redundancy version may be applied according to a redundancy version mode configured at every n PUSCH transmission opportunities.

[0171] PUSCH repetitive transmission type B

[0172] The starting symbol and length of the UL data channel can be determined by a time domain resource allocation method in one time slot, and the BS can transmit numberofrepetitions, i.e., the number of repeated transmissions, to the terminal through high-layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The number of time slots N configured by numberOfSlotsTBoMS determined for TBS can be 1.

[0173] The nominal repetition of the UL data channel can be determined based on the starting symbol and length of the UL data channel configured by the BS as follows. The nominal repetition can indicate the resources of the symbols configured by the BS for PUSCH repetition transmission, and the terminal can determine the resources available for UL in the configured nominal repetition. In this case, the time slot where the nth nominal repetition starts can be determined by is given by, and the symbol whose nominal repetition starts in the start slot can be given by The time slot where the nth nominal repetition ends can be given by is given by , and the symbol whose nominal repetition ends in the starting slot can be given by Here, n=0, ..., numberofrepetitions-1, S may represent a start symbol of a UL data channel configured by the BS, and L may represent a symbol length of a UL data channel configured by the BS. may indicate the time slot in which PUSCH transmission starts, and The number of symbols per slot may be indicated.

[0174] - The terminal may determine an invalid symbol for PUSCH repetition transmission type B. Symbols configured as DL by tdd-UL-DL-ConfigurationCommon or tdd-UL-DL-ConfigurationDedicated may be determined as invalid symbols for PUSCH repetition transmission type B. Additionally, invalid symbols may be configured based on a higher layer parameter (e.g., InvalidSymbolPattern) that provides a symbol-level bitmap on one slot or two slots. In an embodiment, a 1 in the bitmap may indicate an invalid symbol, and the periodicity and pattern of the bitmap may be configured by a higher layer parameter (e.g., periodicityAndPattern). If a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 is 1, the terminal may apply an invalid symbol pattern. If a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 indicates 0, the terminal may not apply the invalid symbol mode. Alternatively, if a higher layer parameter (e.g., InvalidSymbolPattern) is configured and the parameter InvalidSymbolPatternIndicator-ForDCIFormat0_1 or InvalidSymbolPatternIndicator-ForDCIFormat0_2 is not configured, the terminal may apply the invalid symbol mode.

[0175] After determining the invalid symbols in each nominal repetition, the terminal may regard the symbols other than the determined invalid symbols as valid symbols. If one or more valid symbols are included in each nominal repetition, the nominal repetition may include one or more actual repetitions. Each actual repetition may indicate the symbols actually used for PUSCH repetition transmission in the symbols configured as nominal repetitions, and may include a group of consecutive valid symbols of PUSCH repetition type B that can be used in one time slot. Except when the symbol length L of the UL data channel configured by the BS is equal to 1, when the actual repetition with one symbol is configured as valid, the terminal may omit the actual repetition transmission. In the following Table 12, the redundancy version may be applied according to the redundant version mode configured for repetition every n times.

[0176] TB Processing over Multiple Timeslots (TBoMS)

[0177] The starting symbol and length of the UL data channel can be determined by the time domain resource allocation method in one time slot, and the BS can transmit the number of repeated transmissions to the terminal through high-layer signaling (e.g., RRC signaling) or L1 signaling (e.g., DCI). The TBS can be determined using an N value (e.g., N is greater than or equal to 1), and the N value is the number of time slots configured by numberOfSlotsTBoMS.

[0178] The terminal may transmit a UL data channel having the same starting symbol and the same length as the UL data channel configured by the BS in consecutive time slots based on the number of repeated transmissions received from the BS and the number of time slots determined for the TBS. When at least one of the symbols of the time slot configured as DL by the BS for the terminal or the time slot configured by the BS for repeated transmission of the UL data channel is configured as DL, the terminal may omit the UL data channel transmission in the time slot configured as DL by the BS for the terminal or the time slot configured by the BS for repeated transmission of the UL data channel. For example, the terminal may not transmit the UL data channel included in the number of repeated transmissions of the UL data channel to the BS.

[0179] A terminal supporting Rel-17 UL data repetition transmission may determine a time slot in which UL data repetition transmission may be performed as an available time slot, and when a UL data channel is repeatedly transmitted in a time slot determined as an available time slot, the number of transmissions may be counted. When repeated transmission of the UL data channel is omitted in a time slot determined as an available time slot, the terminal may postpone repeated transmission of the UL data channel, and then repeatedly transmit the UL data channel to the BS in a time slot in which transmission may be performed. In the following Table 12, a redundancy version may be applied according to a redundancy version mode configured at every n PUSCH transmission opportunities.

[0180] Table 12

[0181] When the terminal is configured with enabling AvailableSlotCounting, the terminal can determine the available time slots for type A PUSCH repetition transmission and TBoMSPUSCH transmission based on tdd-UL-DL-ConfigurationCommon, tdd-UL-DL-ConfigurationDedicated, ssb-PositionsInBurst, and time domain resource allocation (TDRA) information field values. When at least one symbol configured for PUSCH by TDRA in a time slot for PUSCH transmission overlaps with at least one symbol used for purposes other than UL transmission, the time slot for PUSCH transmission can be determined as an unavailable time slot.

[0182] Fig.10 A method for reconfiguring SSB transmission through dynamic signaling of a 5G system according to an embodiment of the present disclosure is shown.

[0183] refer to Fig.10 , the BS can configure ssb-PositionsInBurst=11110000 1002 for the terminal through high-layer signaling (e.g., SIB1 or ServingCellConfigCommon), and can transmit up to two SSBs with a subcarrier spacing of 30 kHz within 0.5 ms, which corresponds to one slot length when one slot is configured by 14 OFDM symbols. Therefore, the terminal can receive four SSBs within 1 ms (or when one slot is configured by 14 OFDM symbols, this corresponds to two slot lengths). The BS can reduce the density of SSB transmission to save energy. In order to reduce the density of SSB transmission, the BS can reconfigure the SSB transmission configuration information by broadcasting a bitmap 1010xxxx 1004 via a group common DCI1003 with a network energy-saving radio network temporary identifier (nwes-RNTI) (or es-RNTI). The terminal may cancel transmission of SS block #1 1005 and SS block #3 1006 based on the bitmap 1004 configured through the group common DCI. Fig.10 A method 1001 of reconfiguring SSB transmission based on a bitmap through a group common DCI is shown.

[0184] In addition, the BS can reconfigure the ssb-periodicity configured by high-level signaling (e.g., RRC message) through a group-common DCI. The BS can additionally configure timer information for indicating the time point of applying the group-common DCI, and can transmit the SSB based on the SSB transmission information reconfigured by the group-common DCI for the time of the configured timer. After the timer ends, the BS can transmit the SSB based on the SSB transmission information configured by the previous high-level signaling (e.g., RRC message). The BS can change the configuration from normal mode to energy-saving mode by using a timer, and reconfigure the SSB configuration information according to the configuration change. The BS can configure the time point and period of application of the SSB configuration information reconfigured using the group-common DCI for the terminal by using the offset and interval information. From the moment the group-common DCI is received (e.g., the time point of applying the offset), the terminal may not detect the SSB within the configured interval.

[0185] The BS may reconfigure the reference signal configuration information through high layer signaling and dynamic signaling to reduce energy consumption. In this case, a method for determining a reference signal for measuring a downlink path loss by a terminal when the reference signal for measuring a downlink path loss is cancelled is disclosed.

[0186] First embodiment: PUSCH power control method

[0187] In this method, when the terminal transmits UL data through the UL data channel in response to a power control command received from the BS, the terminal configures the transmission power of the UL data channel and transmits the UL data. The UL data channel transmission power of the terminal can be determined as shown in the following equation (2), where the PUSCH power control adjustment state corresponds to the i-th transmission unit, the parameter set configuration index j and the closed loop index l. In equation (2), when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined by the cell c, the carrier frequency f and the BWP b, and can be distinguished by the indexes b, f and c.

[0188] ... (2)

[0190] In equation (2), It is the maximum transmission power that the terminal can use in the i-th transmission unit and can be determined by the power class of the terminal and the parameters activated by the BS and various parameters embedded in the terminal.

[0191] Can be and and configuration. The terminal can be configured via cell-specific higher-layer signaling, and It can be configured through terminal-specific higher-layer signaling. It can indicate the PUSCH used to send msg3 when j=0, indicate the configuration authorization PUSCH when j=1, and indicate the authorization PUSCH when j is a value among j={2,...,J-1}.

[0192] : Subcarrier spacing configuration value The amount of resources used in the i-th PUSCH transmission unit (eg, the number of RBs used for PUSCH transmission in the frequency domain) may be indicated.

[0193] is a value used to compensate for path loss and may indicate a value that may be determined by a higher layer configuration and an SRS Resource Indicator (SRI) (in a dynamic grant PUSCH).

[0194] is the path loss between the BS and the terminal, and the terminal can use the reference signal resource signaled by the BS The path loss is calculated by the difference between the transmit power of the reference signal and the terminal received signal level of the reference signal. It can be indicated by the terminal through the reference signal index The DL path loss estimate of the reference signal estimate, and the reference signal index It may be determined by the terminal through higher layer configuration and SRI (eg, in a dynamically granted PUSCH or in a configured granted PUSCH based on ConfiguredGrantConfig not including the higher layer configuration rrc-ConfiguredUplinkGrant (Type 2 configured granted PUSCH)) or higher layer configuration.

[0195] A value determined according to a modulation and coding scheme (MCS) and a format (transmission format (TF)) of information transmitted through a PUSCH (eg, whether UL-SCH is included or whether CSI is included) may be indicated.

[0196] is a closed-loop power control adjustment value, and may indicate a value of a closed-loop index l that may be determined for PUSCH by a higher-layer configuration and SRI. Closed-loop power adjustment for PUSCH transmission may be supported by an accumulation method that accumulates and applies a value indicated by a TPC command or an absolute method that directly applies a value indicated by a TPC command, and may be determined based on whether a higher-layer parameter tpc-Accumulation is configured. When the higher-layer parameter tpc-Accumulation is configured to be disabled, closed-loop power adjustment may be performed on PUSCH transmission by an absolute method, and when tpc-Accumulation is not configured, closed-loop power adjustment may be performed on PUSCH transmission by an accumulation method.

[0197] More specifically, the terminal may determine based on the following conditions: Reference signal index .

[0198] When PUSCH-PathlossReferenceRS and enabledDefaultBeamPL-ForSRS are not configured for the terminal, or before dedicated high-layer parameters are configured for the terminal, the terminal can calculate the RS resource by using the SS / PBCH block with the same SS / PBCH block index as the SS / PBCH block used to receive the MIB. .

[0199] When the number of RS resource indexes configured for the terminal reaches the value of maxNrofPUSCH-PathlossReferenceRSs, and each RS configuration set is configured by PUSCH-PathlossReferenceRS according to the number of RS resource indexes, the terminal can identify the RS resource index in the RS resource index set corresponding to the SS / PBCH block index. , or a CSI-RS resource index provided by the pusch-PathlossReferenceRS-Id of the PUSCH-PathlossReferenceRS. In this case, when the PUSCH-PathlossReferenceRS-Id value is mapped to the SS / PBCH block index, the RS resource set may include one or two SS / PBCH block index sets, and when the pusch-PathlossReferenceRS-Id value is mapped to the CSI-RS resource index, it includes a CSI-RS resource index set.

[0200] When the PUSCH is scheduled via a Random Access Response (RAR) UL grant or a Type-2 random access procedure, the terminal may use the same RS resource index as that used for the Physical Random Access Channel (PRACH) transmission. .

[0201] When SRI-PUSCH-PowerControl and one or more values ​​of PUSCH-PathlossReferenceRS-Id are configured for the terminal, the terminal can receive mapping information between the SRI field value and the PUSCH-PathlossReferenceRS-Id from the BS by scheduling the sri-PUSCH-PowerControlId of the SRI-PUSCH-PowerControl between a set of values ​​of the SRI field in the DCI format transmitted by the PUSCH and the PUSCH-PathlossReferenceRS-Id value, and determine the RS resource index according to the PUSCH-PathlossReferenceRS-Id mapped to the SRI field value .

[0202] When PUSCH transmission is scheduled by DCI format 0_0 and spatial configuration is performed on the terminal by PUCCH-SpatialRelationInfo, the terminal may use the same RS resource index as that of PUCCH transmission using the PUCCH resource with the lowest index. .

[0203] When PUSCH transmission is not scheduled by DCI format 0_0, enableDefaultBeamPL-ForSRS is configured for the terminal, and PUSCH-PathlossReferenceRS and PUSCH-PathlossReferenceRS-r16 are not configured, the terminal can use the same RS resource index as the SRS resource set including the SRS resources related to PUSCH transmission .

[0204] When PUSCH transmission is scheduled by DCI format 0_0 and no spatial configuration for PUCCH transmission is provided to the terminal, PUSCH is scheduled by DCI format 0_1 ​​or DCI format 0_2 that does not include the SRI field, or SRI-PUSCH-PowerControl is not configured for the terminal, the terminal can determine the RS resource index with a PUSCH-PathlossReferenceRS-Id value of 0 .

[0205] When PUSCH transmission is scheduled by DCI format 0_0, no PUCCH resources are configured for the terminal, and enableDefaultBeamPL-ForPUSCH0-0 is configured for the terminal, the terminal can use the periodic RS resource configured by qcl-Type of typeD in the TCI state or the QCL assumption of the control resource set (CORESET) with the lowest index as the RS resource index .

[0206] When PUSCH transmission is scheduled by DCI format 0_0, no spatial configuration for PUCCH resources is provided to the terminal, and enabledDefaultBeamPL-ForPUSCH0_0 is configured for the terminal, the terminal can use the periodic RS resource configured by qcl-Type of typeD in the TCI state or the QCL assumption of the CORESET with the lowest index as the RS resource index .

[0207] For PUSCH transmissions configured by ConfiguredGrantConfig, when rrc-ConfiguredUplinkGrant is included in ConfiguredGrantConfig, RS resource index It can be determined by the pathlossReferenceIndex value included in rrc-ConfiguredUplinkGrant.

[0208] For PUSCH transmission configured by ConfiguredGrantConfig that does not include rrc-ConfiguredUplinkGrant, the terminal can determine the RS resource index by mapping the PUSCH-PathlossReferenceRS-Id of the SRI field in the DCI format that activates the PUSCH transmission. If the DCI transmitting the activation PUSCH does not include the SRI field, the terminal can index the RS resource The RS resource index whose PUSCH-PathlossReferenceRS-Id value is 0 is determined.

[0209] When enablePL-RS-UpdateForPUSCH-SRS is configured for the terminal and the mapping between sri-PUCCH-PowerControlId and PUSCH-PathlossReferenceRS-Id is updated by the MAC CE, for PUSCH transmissions scheduled by a DCI format that does not include the SRI field, PUSCH transmissions configured by ConfiguredGrantConfig, or PUSCH activated by a DCI format described in the standard and that does not include the SRI field, the RS resource index It can be determined by PUSCH-PathlossReferenceRS-Id mapped to sri-PUSCH-PowerControlId = 0.

[0210] Through the above method, the terminal can determine RS resources for measuring path loss (PL) based on high layer signaling and L1 signaling or spatial configuration for PUCCH, so as to determine power for PUSCH transmission.

[0211] The first embodiment of the present disclosure provides a method for determining the RS resource of the terminal according to the change of the RS resource transmission configuration information for energy saving. In addition, the restriction on the change of the RS resource transmission configuration information for energy saving is disclosed. The RS resource determination method for measuring the downlink PL can be one or a combination of the following methods.

[0212] Method 1-1

[0213] In method 1-1, a method is proposed in which the BS can change the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving and determine the RS resource of the PL-RS of the terminal. The pre-configured SSB and CSI-RS configuration information can be reconfigured for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving from the BS, and the terminal can determine the RS resource according to whether the new RS resource for the PL-RS is configured, as in the following method.

[0214] Method 1-2

[0215] The BS can reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and can configure new RS resources for PL-RS. The terminal does not apply the conventional method for determining PL-RS, and can apply the new RS resources configured by the BS to measure the DL path loss and determine the PUSCH transmit power. As a method for configuring new RS resources for PL-RS, the SSB index and the CSI-RS index can be preconfigured through high-layer signaling (e.g., RRC message), or can be configured through L1 signaling (e.g., DCI format for energy saving). Thereafter, the BS can perform beam management based on the SSB index and CSI-RS index reconfigured according to the embodiment. The method can also be applied to measure the DL path loss value of the PUSCH configured by ConfiguredGrantConfig, and the RS resources for PUSCH configured by ConfiguredGrantConfig for energy saving can be configured in rrc-ConfiguredUplinkGrant or ConfiguredGrantConfig.

[0216] Method 1-3

[0217] The BS may reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and may not configure new RS resources for PL-RS. The terminal may determine PL-RS as follows according to whether there are preconfigured RS resources for energy saving.

[0218] Methods 1-4

[0219] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. When RS resources for energy saving are configured for the terminal in advance through high-layer signaling (e.g., RRC message), the terminal can identify the RS resource index that overlaps (or maps) between the RS resources configured for energy saving and PUSCH-PathlossReferenceRS, SRI-PUSCH-PowerControl, PUCCH-spatialRelationInfo, or rrc-ConfiguredUplinkGrant in the previously configured ConfiguredGrantConfig, and the identified RS resource index can be used as PL-RS.

[0220] Methods 1-5

[0221] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. When RS resources for energy saving are configured for the terminal in advance through high-layer signaling (e.g., RRC signaling), and there is no overlapping (or mapped) RS resource index between the RS resources configured for energy saving and PUSCH-PathlossReferenceRS, SRI-PUSCH-PowerControl, PUCCH-spatialRelationInfo, or rrc-ConfiguredUplinkGrant in the previously configured ConfiguredGrantConfig, the terminal can determine one of the RS resources configured in advance for energy saving or the RS resources with the lowest index as PL-RS.

[0222] Methods 1-6

[0223] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be cancelled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are not configured for the terminal in advance through high-layer signaling (e.g., RRC message), the terminal can determine the PL-RS based on the RS resource with the lowest index among the RS resources that have not been cancelled among the candidate RS resources previously configured according to PUSCH-PathlossReferenceRS, SRI-PUSCH-PowerControl, PUCCH-spatialRelationInfo or rrc-ConfiguredUplinkGrant in ConfiguredGrantConfig.

[0224] Methods 1-7

[0225] When the BS reconfigures the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. When RS resources for energy saving are not configured for the terminal in advance through high-layer signaling (e.g., RRC message) and all previously configured RS resources are canceled, the terminal can use the SSB that has been used to receive the MIB as PL-RS, or can continue to apply the DL path loss measured using the existing PL-RS until the operation is reconfigured from the operation for energy saving to the normal operation. If the DL path loss measurement is not performed within a predetermined period of time, the terminal can perform switching.

[0226] By the above method, when the RS resource used as PL-RS is canceled by RS resource reconfiguration for energy saving, the terminal can determine the RS resource used for PL-RS and determine the power for PUSCH transmission. The configuration performed by the BS can be applied to and limited to the energy saving mode. In addition, when the BS changes the mode from the energy saving mode or configures it to the normal mode, the terminal can reuse the existing configuration to determine the RS resource used for PL-RS. By the above method, the terminal can determine the PL-RS when the BS does not transmit RS resources or transmits reduced RS resources for energy saving.

[0227] Method 2-1

[0228] In method 2-1, it is proposed that the BS performs cell operation restrictions when the BS changes the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving. The BS can reconfigure the reference signal by considering the restrictions through one or a combination of the following methods.

[0229] Method 2-2

[0230] The BS may determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, the BS may cancel the SSBs other than the SSBs used by the terminal in the initial access. Therefore, the terminal may not think that the SSB used in the initial access is canceled.

[0231] Method 2-3

[0232] The BS can determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, in order to cancel the SSB, if there is a CSI-RS whose qcl-type is configured as TypeD, the SSB can be replaced with the CSI-RS, and thus the BS can cancel the SSB.

[0233] Method 2-4

[0234] The BS can determine the CSI-RS that can be canceled to reduce the number of CSI-RS transmissions, or cancel the transmission and adjust the period. More specifically, in order to cancel the CSI-RS, if there is an SSB with qcl-type configured as TypeD, the CSI-RS can be replaced with the SSB, and thus the BS can cancel the CSI-RS. In addition, the BS can only cancel the CSI-RS with at least one port, which is used to measure the L1 reference signal received power (RSRP) and the L1 reference signal received quality (RSRQ) for DL ​​path loss and beam management.

[0235] Based on the above method, the BS can determine the reference signal that can be cancelled. The above method can be used by the terminal to determine the reference signal that is not always cancelled. Through the above method, the minimum function for cell operation can be provided and the complexity can be reduced. However, too much energy may be consumed.

[0236] Second embodiment: PUCCH power control method

[0237] In this method, when the terminal transmits UL control information through the UL control channel in response to a power control command received from the BS, the terminal configures the transmission power of the UL control channel and transmits the control information. The UL control channel transmission power (PPUCCH) of the terminal can be determined as the following equation (3), which is expressed in dBm and together with the PUCCH power control adjustment state corresponding to the i-th transmission unit and the closed loop index l. In the following equation 3, when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined by the main cell c, the carrier frequency f, and the bandwidth part b, and can be distinguished by the indexes b, f, and c.

[0238] ... (3)

[0240] In equation (3), It is the maximum transmission power that the terminal can use in the i-th transmission unit and can be determined by the power class of the terminal and the parameters activated by the BS and various parameters embedded in the terminal.

[0241] Can be and and configuration. is a cell-specific value and can be configured via p0-nominal as a higher layer signaling, and if there is no corresponding configuration, then Can be 0 decibel milliwatt (dBm). is a cell-specific value and can be configured by p0-PUCCH-Value in p0-PUCCH as higher layer signaling, in bandwidth part b, carrier frequency f and primary cell c, Can be greater than or equal to 0 and less than ,and Can indicate a group The value may be configured by maxNrofPUCCH-P0-PerSet which is a higher layer signaling. The set of values ​​can be configured via p0-Set as a higher layer signaling, and if there is no corresponding configuration, the set can be considered as .

[0242] : Subcarrier spacing configuration value The amount of resources used in the ith PUCCH transmission unit (eg, the number of RBs used for PUCCH transmission in the frequency domain) with bandwidth part b, carrier frequency f, and primary cell c may be indicated.

[0243] is the path loss between the BS and the terminal, and the terminal can use the reference signal resources configured by the BS The path loss is calculated by the difference between the transmit power of the reference signal and the terminal received signal level of the reference signal.

[0244] about , if high-level signaling deltaF-PUCCH-f0 is configured for PUCCH format 0, the terminal may use the corresponding value; if high-level signaling deltaF-PUCCH-f1 is configured for PUCCH format 1, the corresponding value is used; if high-level signaling deltaF-PUCCH-f2 is configured for PUSCH format 2, the corresponding value is used; if high-level signaling deltaF-PUCCH-f3 is configured for PUCCH format 3, the corresponding value is used; if high-level signaling deltaF-PUCCH-f4 is configured for PUCCH format 4, the corresponding value is used; and if high-level signaling is configured for all PUCCH formats, 0 is used.

[0245] It is the PUCCH transmit power adjustment element in bandwidth part b, carrier frequency f and primary cell c, and different calculation methods can be used according to the PUCCH format.

[0246] The PUCCH power control adjustment state value of the i-th PUCCH transmission unit corresponding to the bandwidth part b, the carrier frequency f and the closed-loop index l in the primary cell c may be indicated. The closed-loop power adjustment for PUCCH transmission may adopt an accumulation method of accumulating and applying the value indicated by the TPC command.

[0247] More specifically, the terminal may determine based on the following conditions: Reference signal index .

[0248] Can instruct the terminal to index RS resources Calculate the downlink path loss estimate.

[0249] If no pathlossReferenceRSs or terminal-specific higher-layer parameters are configured for the terminal, the terminal can calculate the pathlossReferenceRSs by using the SS / PBCH block for receiving the MIB. .

[0250] If the number of RS resource indexes is configured for the terminal, the terminal can use of to calculate RS resources. In this case, the RS resource set may be provided by pathlossReferenceRSs. When the corresponding pucch-PathLossReferenceRS-Id is mapped to the SS / PBCH block index, the RS resource set may include one or two sets in the SS / PBCH block index set provided by ssb-Index in PUCCH-PathlossReferenceRS, and when the corresponding pucch-PathLossReferenceRS-Id is mapped to the CSI-RS resource index, it includes a CSI-RS resource index set provided by csi-RS-Index. The UE may identify RS resources in the RS resource set corresponding to the SS / PBCH block index or CSI-RS resource index provided by the pucch-PathlossReferenceRS-Id in PUCCH-PathlossReferenceRS.

[0251] If the RS resource index is configured for the terminal , the terminal can be accessed by using RS resources to calculate In this case, the RS resource set may be configured by pathlossReferenceRSs, and the RS resource set may include an SS / PBCH block index indicated by ssb-Index or a CSI-RS resource index indicated by csi-RS-Index. If the high-level parameters pathlossReferenceRSs and PUCCH-SpatialRelationInfo are configured for the terminal, the terminal may determine the referenceSignal of the PUCCH-PathlossReferenceRS corresponding to the pucch-PathlossReferenceRS-Id configured in the PUCCH-SpatialRelationInfo. In this case, if two or more values ​​of PUCCH-SpatialRelationInfo can be configured, and a PUCCH including hybrid automatic repeat request acknowledgement (HARQ-ACK) information for a PDSCH providing an activation command for PUCCH-SpatialRelationInfo can be transmitted in the kth time slot, the terminal can apply the activation command from the first time slot after the (k+3)th time slot. If PUCCH-SpatialRelationInfo includes servingCellId, the terminal can receive a resource index in an activated downlink BWP corresponding to a supported cell. Rs.

[0252] If PUCCH-SpatialRelationInfo includes servingCellId, the terminal can receive RS resource index .

[0253] If pathlossReferenceRSs is configured for the terminal but PUCCH-SpatialRelationInfo is not configured, the terminal can determine the pathlossReferenceRS based on the referenceSignal of PUCCH-PathlossReferenceRS. , the index of pucch-PathlossReferenceRS-Id is 0 in the RS resources for the primary cell or (if configured) the supported cells indicated by the higher layer parameter pathlossReferenceLinking.

[0254] If the terminal is configured with higher-layer parameters as described below, pathlossReferenceRSs is not configured, PUCCH-SpatialRelationInfo is not configured, and the higher-layer parameter enableDefualtBeamPL-ForPUCCH-r16 is configured, none of the CORESETs is configured with CORESETPoolIndex as 1, or all CORESETs are configured with CORESETPoolIndex as 1, and no code point in the DCI format is mapped to two TCI states, the terminal may determine the RS resource index for the periodic RS resources including QCL-TypeD in the TCI state or for the QCL assumption of the CORESET with the lowest index in the activated downlink BWP of the primary cell. If PUCCH transmission in multiple time slots is possible, the terminal can transmit the same Applied to each time slot to transmit PUCCH.

[0255] Through the above method, the terminal can determine the RS resources for measuring the PL based on the higher layer signaling (eg, RRC message) and the L1 signaling (eg, DCI) so as to determine the power for PUCCH transmission.

[0256] A second embodiment of the present disclosure provides a method for determining the RS resource of a terminal according to a change in RS resource transmission configuration information for energy saving. In addition, a restriction on the change of RS resource transmission configuration information for energy saving is disclosed. The RS resource determination method for measuring PL (ie, downlink path loss) may be one or a combination of the following methods.

[0257] Method 3-1

[0258] In method 3-1, a method for determining RS resources for PL-RS of a terminal according to changing pre-configured SSB and CSI-RS configuration information by a BS for a terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving is disclosed. Pre-configured SSB and CSI-RS configuration information may be reconfigured for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving from the BS, and RS resources may be determined according to whether new RS resources for PL-RS are configured, as in the following method.

[0259] Method 3-2

[0260] The BS can reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and can configure new RS resources for PL-RS. The terminal does not apply the conventional method for determining PL-RS, and can apply the configured new RS resources to measure DL path loss and determine PUCCH transmit power. As a method of configuring new RS resources for PL-RS, the SSB index and CSI-RS index can be preconfigured through high-layer signaling (e.g., RRC message), or can be configured through L1 signaling (e.g., DCI format for energy saving). Thereafter, the BS can perform beam management based on the SSB index and CSI-RS index reconfigured according to the embodiment.

[0261] Method 3-3

[0262] The BS may reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and may not configure new RS resources for PL-RS. The terminal may determine PL-RS as follows according to whether there are preconfigured RS resources for energy saving.

[0263] Method 3-4

[0264] When the BS reconfigures the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are configured for the terminal in advance through high-layer signaling (e.g., RRC message), the terminal can identify the RS resource index that overlaps or maps between the RS resources configured for energy saving and the previously configured pathlossReferenceRSs, PUCCH-PathlossReferenceRS, or pucch-SpatialRelationInfoId, and the identified RS resource index can be used as PL-RS.

[0265] Method 3-5

[0266] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are configured for the terminal in advance through high-layer signaling (e.g., RRC message), and there is no overlapping or mapped RS resource index between the RS resources configured for energy saving and the previously configured pathlossReferenceRSs, PUCCH-PathlossReferenceRS, or pucch-SpatialRelationInfoId, the terminal can determine one of the RS resources configured in advance for energy saving or the RS resource with the lowest index as the PL-RS.

[0267] Methods 3-6

[0268] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be cancelled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are not configured for the terminal in advance through high-layer signaling, the terminal can determine the PL-RS based on the RS resource with the lowest index that has not been cancelled among the candidate RS resources previously configured according to pathlossReferenceRSs, PUCCH-PathlossReferenceRS, or pucch-SpatialRelationInfoId.

[0269] Methods 3-7

[0270] When the BS reconfigures the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. When RS resources for energy saving are not configured for the terminal in advance through high-layer signaling and all RS resources previously configured for the terminal are canceled, the terminal can use the SSB that has been used to receive the MIB as PL-RS, or can continue to apply the DL path loss measured using the existing PL-RS until the operation is reconfigured from the operation for energy saving to the normal operation. If the DL path loss measurement is not performed within a predetermined period of time, the terminal can perform switching.

[0271] Through the above method, when the RS resource used as PL-RS is canceled by the RS resource reconfiguration for energy saving configured by the BS, the terminal can determine the RS resource for the PL-RS of the terminal and determine the power for PUCCH transmission. The configuration from the BS can be applied to and limited to the energy saving mode. In addition, when the BS changes the mode from the energy saving mode or configures it to the normal mode, the terminal can reuse the existing configuration to determine the resources for the PL-RS. Therefore, the terminal can determine the PL-RS when the BS does not transmit RS resources or transmits a reduced RS signal for energy saving.

[0272] Method 4-1

[0273] In method 4-1, it is proposed to restrict the BS from performing cell operation when the BS changes the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving. The BS can reconfigure the reference signal by considering the restriction via one or a combination of the following methods.

[0274] Method 4-2

[0275] The BS may determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, the BS may cancel the SSBs other than the SSBs used by the terminal in the initial access. Therefore, the terminal may not think that the SSB used in the initial access is canceled.

[0276] Method 4-3

[0277] The BS can determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, in order to cancel the SSB, if there is a CSI-RS whose qcl-type is configured as TypeD, the SSB can be replaced with the CSI-RS, and thus the BS can cancel the SSB.

[0278] Method 4-4

[0279] The BS may determine the CSI-RS that can be canceled to reduce the number of CSI-RS transmissions, or cancel the transmission and adjust the period. More specifically, in order to cancel the CSI-RS, if there is an SSB with qcl-type configured as TypeD, the CSI-RS may be replaced with an SSB, and thus the BS may cancel the CSI-RS. In addition, the BS may only cancel the CSI-RS with one or two ports or more ports, which are used to measure L1-RSRP and L1-RSRQ for DL ​​path loss and beam management.

[0280] Based on the above method, the BS can determine the reference signal that can be cancelled. The above method can be used for the terminal to determine the reference signal that is not always cancelled. Therefore, the minimum function for cell operation can be provided and the complexity can be reduced. However, too much energy may be consumed.

[0281] Third embodiment: SRS power control method

[0282] In this method, when the terminal performs transmission through a UL reference signal (sounding reference signal (SRS)) in response to a power control command received from a BS, the terminal configures the transmission power of the UL reference signal and transmits the signal. The UL reference signal transmission power (PSRS) of the terminal can be determined in the following equation (4), which is expressed in dBm and together with the SRS power control adjustment state corresponding to the i-th transmission unit and the closed loop index l. In equation (4), when the terminal supports multiple carrier frequencies in multiple cells, each parameter can be determined by the cell c, the carrier frequency f, and the bandwidth part b, and can be distinguished by the indexes b, f, and c.

[0283] ... (4)

[0285] In equation (4), It is the maximum transmission power that the terminal can use in the i-th transmission unit and can be determined by the power class of the terminal and the parameters activated by the BS and various parameters embedded in the terminal.

[0286] It can be configured by p0 as a high-layer signaling for bandwidth part b, carrier frequency f and cell c, and the SRS resource set It can be configured by SRS-ResourceSet and SRS-ResourceSetId which are higher layer signaling.

[0287] : Subcarrier spacing configuration value The amount of resources used in the ith SRS transmission unit (eg, the number of RBs used for SRS transmission on the frequency axis) may be indicated.

[0288] It can be configured by α as a higher layer signaling for bandwidth part b, carrier frequency f and cell c, and the SRS resource set It can be configured by SRS-ResourceSet and SRS-ResourceSetId which are higher layer signaling.

[0289] is the path loss between the BS and the terminal, and the terminal can use the reference signal resource signaled by the BS The path loss is calculated by the difference between the transmit power of the reference signal and the terminal received signal level of the reference signal.

[0290] The SRS power control adjustment state value of the i-th SRS transmission unit corresponding to the bandwidth part b, the carrier frequency f, and the closed-loop index l in the cell c may be indicated.

[0291] More specifically, the terminal may determine based on the following conditions: Reference signal index .

[0292] If pathlossReferenceRSs or SRS-PathlossReferenceRS-Id is not configured for the terminal, or terminal-specific high-layer parameters are not configured for it, the terminal can calculate it by using the SS / PBCH block for receiving MIB .

[0293] If pathlossReferenceRS or SRS-PathlossReferenceRS-Id is not configured for the terminal, spatialRelationInfo is not configured, enableDefaultBeamPL-ForSRS is configured, coresetPollIndex value 1 is not configured for any CORESET in ControlResourceSet or coresetPoolIndex value of all CORESETs is 1, and there is no code point of TCI field in the DCI format mapped to the search space set of two TCI states, then the terminal can determine the periodic RS resource as RS resource index , the periodic RS resource can be configured by the qcl-Type of typeD in the TCI state or the QCL assumption of the CORESET with the lowest index, and if the CORESET is not configured, then in the active PDSCH TCI state with the lowest index.

[0294] Through the above method, the terminal can determine the RS resources for measuring the PL based on the higher layer signaling (eg, RRC message) and the L1 signaling (eg, DCI) so as to determine the power for SRS transmission.

[0295] A third embodiment of the present disclosure provides a method for determining the RS resource of a terminal according to a change in RS resource transmission configuration information for energy saving. In addition, a restriction on the change of RS resource transmission configuration information for energy saving is disclosed. The RS resource determination method for measuring PL (ie, downlink path loss) may be used as one of the following methods or a combination thereof.

[0296] Method 5-1

[0297] In method 5-1, a method for determining RS resources for PL-RS of a terminal according to changing pre-configured SSB and CSI-RS configuration information by a BS for a terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving is disclosed. Pre-configured SSB and CSI-RS configuration information may be reconfigured for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving from the BS, and the terminal may determine RS resources according to whether new RS resources for PL-RS are configured, as in the following method.

[0298] Method 5-2

[0299] The BS can reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and can configure new RS resources for PL-RS. The terminal does not apply the conventional method for determining PL-RS, and can apply the configured new RS resources to measure DL path loss and determine SRS transmit power. As a method of configuring new RS resources for PL-RS, the SSB index and CSI-RS index can be preconfigured through high-layer signaling (e.g., RRC message), or can be configured through L1 signaling (e.g., DCI format for energy saving). Thereafter, the BS can perform beam management based on the SSB index and CSI-RS index reconfigured according to the embodiment.

[0300] Method 5-3

[0301] The BS may reconfigure the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, and may not configure new RS resources for PL-RS. The terminal may determine PL-RS as follows according to whether there are preconfigured RS resources for energy saving.

[0302] Method 5-4

[0303] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are configured for the terminal in advance through high-layer signaling, the terminal can identify the RS resource index that overlaps or maps between the RS resources configured for energy saving and the previously configured pathlossReferenceRS or SRS-PathlossReferenceRS, and the identified RS resource index can be used as PL-RS.

[0304] Method 5-5

[0305] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be cancelled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are configured for the terminal in advance through high-layer signaling, and there is no overlapping or mapped RS resource index between the RS resources configured for energy saving and the previously configured pathlossReferenceRS or SRS-PathlossReferenceRS, the terminal can determine one of the RS resources configured in advance for energy saving or the RS resource with the lowest index as the PL-RS.

[0306] Method 5-6

[0307] When the BS reconfigures the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be cancelled based on the reconfigured SSB and CSI-RS transmission information. If RS resources for energy saving are not configured for the terminal in advance through high-layer signaling, the terminal can determine the PL-RS based on the RS resource with the lowest index among the RS resources that have not been cancelled among the candidate RS resources previously configured according to pathlossReferenceRS or SRS-PathlossReferenceRS.

[0308] Methods 5-7

[0309] When the BS reconfigures the preconfigured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the RS resources that have been used as PL-RS can be canceled based on the reconfigured SSB and CSI-RS transmission information. When RS resources for energy saving are not configured for the terminal in advance through high-layer signaling and all RS resources previously configured for the terminal are canceled, the terminal can use the SSB that has been used to receive the MIB as PL-RS, or can continue to apply the DL path loss measured using the existing PL-RS until the operation is reconfigured from the operation for energy saving to the normal operation. If the DL path loss measurement is not performed within a predetermined period of time, the terminal can perform switching.

[0310] By the above method, when the RS resource used as PL-RS is cancelled by the RS resource reconfiguration for energy saving of the BS, the terminal can determine the RS resource used for the PL-RS of the terminal and determine the power used for SRS transmission. The configuration from the BS can be applied to and limited to the energy saving mode. When the BS changes the mode from the energy saving mode or configures it to the normal mode, the terminal can reuse the existing configuration to determine the resources used for PL-RS. By the above method, the terminal can determine the PL-RS when the BS does not transmit RS resources or transmits a reduced RS signal for energy saving.

[0311] Method 6-1

[0312] In method 6-1, when the BS changes the pre-configured SSB and CSI-RS configuration information for the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI) for energy saving, the restriction of the BS on the cell operation is disclosed. The BS can reconfigure the reference signal by considering the restriction via one or a combination of the following methods.

[0313] Method 6-2

[0314] The BS may determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, the BS may cancel the SSBs other than the SSBs used by the terminal in the initial access. Therefore, the terminal may not think that the SSB used in the initial access is canceled.

[0315] Method 6-3

[0316] The BS can determine the cancelable SSB to reduce the number of SSB transmissions, or cancel the transmission and adjust the cycle. More specifically, in order to cancel the SSB, if there is a CSI-RS whose qcl-type is configured as TypeD, the SSB can be replaced with the CSI-RS, and thus the BS can cancel the SSB.

[0317] Method 6-4

[0318] The BS may determine the CSI-RS that can be canceled to reduce the number of CSI-RS transmissions, or cancel the transmission and adjust the period. More specifically, in order to cancel the CSI-RS, if there is an SSB with qcl-type configured as TypeD, the CSI-RS may be replaced with an SSB, and thus the BS may cancel the CSI-RS. In addition, the BS may only cancel the CSI-RS with at least one or port, which is used to measure L1-RSRP and L1-RSRQ for DL ​​path loss and beam management.

[0319] Based on the above method, the BS can determine the reference signal that can be cancelled. The above method can be used for the terminal to determine the reference signal that is not always cancelled, and can provide the minimum function for cell operation and reduce complexity. However, it may consume too much energy.

[0320] Fourth embodiment

[0321] Fig.11 It is a flowchart of a terminal that determines RS resources for PL-RS according to the reconfiguration of reference signals for energy saving in a 5G system according to an embodiment of the present disclosure.

[0322] In step 1101, the terminal may receive SSB CSI-RS configuration information and configuration information for PL-RS from the BS through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI). In step 1102, the terminal may measure DL path loss based on the PL-RS determined through the SSB CSI-RS configuration information and the configuration information for PL-RS received from the BS, and control UL (e.g., PUSCH, PUCCH and / or SRS) transmit power. In step 1103, the terminal may receive reconfiguration information of a reference signal (e.g., SSB or CSI-RS) for energy saving through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI). In step 1104, the terminal may determine whether to reconfigure the PL-RS based on the reconfigured configuration information. In step 1105, if the existing PL-RS is not cancelled by the reconfigured reference signal configuration information, the terminal may use the existing PL-RS. In step 1106, if the PL-RS is cancelled by the reconfigured reference signal configuration information, the terminal can determine the PL-RS according to whether the new RS resource is reconfigured from the reconfigured reference signal configuration information to achieve energy saving. In step 1107, if the terminal receives a new PL-RS from the BS through signaling for energy saving, the terminal can determine the configured RS resource as the PL-RS and measure the DL path loss by using the determined PL-RS. In step 1108, if the BS does not configure the information of the PL-RS for the terminal through the signaling for energy saving, the terminal can determine the PL-RS by using the existing candidate RS resources. In step 1109, if the RS resources for all candidate PL-RS are cancelled, the terminal can determine the PL-RS and measure the DL path loss by using the SSB for obtaining the MIB. If the method for determining the PL-RS can be branched according to the reconfiguration information received from the BS, the order of the flowchart can be changed or combined. Regarding the number of cases of the PL-RS determination method, the methods described in the first embodiment, the second embodiment, and the third embodiment above can be applied.

[0323] Fig.12 is a flowchart of the operation of reconfiguring reference signals for energy saving in a 5G system according to an embodiment of the present disclosure.

[0324] refer to Fig.12In step 1201, the BS may transmit SSB and CSI-RS configuration information and configuration information for PL-RS to the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI). Thereafter, in step 1202, the BS may determine that it transmits a cancelable reference signal (e.g., SSB or CSI-RS) to achieve energy saving. The method for determining whether the reference signal is cancelable may be determined as previously described. In step 1203, the BS may transmit SSB and CSI-RS reconfiguration information for energy saving to the terminal through high-layer signaling (e.g., RRC message) and L1 signaling (e.g., DCI).

[0325] Fig.13 is a block diagram of a terminal according to an embodiment.

[0326] refer to Fig.13 , the terminal 1300 may include a communication unit 1301, a controller (e.g., a processor) 1302, and a storage unit (e.g., a memory) 1303. According to at least one of the above methods, the communication unit 1301, the controller 1302, and the storage unit 1303 of the terminal 1300 may operate. However, the elements of the terminal 1300 are not limited to the examples shown, and the terminal 1300 may also include elements of a different number than the above elements. In addition, in certain cases, the communication unit 1301, the controller 1302, and the storage unit 1303 may be implemented in a single chip type.

[0327] According to an embodiment, the communication unit 1301 may also be configured by a transmitter and a receiver. The communication unit 1301 may transmit a signal to a BS or receive a signal from a BS. The signal may include control information and data. The communication unit 1301 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency. The communication unit 1301 may receive a signal through a wireless channel and output the signal to the controller 1302, and may transmit a signal output from the controller 1302 through a wireless channel.

[0328] The controller 1302 may control a series of processes, wherein the terminal 1300 may operate according to the above-mentioned embodiments of the present disclosure. For example, the controller 1302 may execute or control the operation of the terminal to execute at least one or a combination of the methods according to the embodiments of the present disclosure. The controller 1302 may include at least one processor, a communication processor (CP) that performs communication control, and an application processor (AP) that controls a high layer (e.g., an application).

[0329] The storage unit 1303 may store control information (e.g., information related to channel estimation using a DMRS transmitted via a PUSCH included in a signal obtained by the terminal 1300) or data, and may have an area for storing data required for the control of the controller 1302 and data generated by the control of the controller 1302.

[0330] Fig.14 is a block diagram of a BS according to an embodiment.

[0331] refer to Fig.14 , BS 1400 may include a communication unit (e.g., a wireless communication unit) 1401, a backhaul communication unit 1402, a storage unit (e.g., a memory) 1403, and a controller (e.g., a processor) 1404. According to at least one of the methods corresponding to the above embodiments or a combination thereof, the communication unit 1401, the backhaul communication unit 1402, the storage unit 1403, and the controller 1404 of BS 1400 may operate. However, the elements of BS 1400 are not limited to the examples shown. According to another embodiment, BS 1400 may also include more or fewer elements than the above elements. In addition, in certain cases, the communication unit 1401, the controller 1404, and the storage unit 1403 may be implemented in a single chip type.

[0332] According to an embodiment, the communication unit 1401 may also be configured by a transmitter and a receiver. The communication unit 1401 may transmit a signal to a terminal or receive a signal from a terminal. The signal may include control information and data. The communication unit 1401 may include an RF transmitter that up-converts and amplifies the frequency of the transmitted signal, and an RF receiver that performs low-noise amplification on the received signal and down-converts the frequency. The communication unit 1401 may receive a signal through a wireless channel and output the signal to the controller 1404, and may transmit a signal output from the controller 1404 through a wireless channel.

[0333] The backhaul communication unit 1402 provides an interface for performing communication with other nodes within the network. That is, the backhaul communication unit 1402 converts a bit stream transmitted from the BS to another node, another access node, another base station, a higher node, a core network, etc. into a physical signal, and converts a physical signal received from another node into a bit stream.

[0334] The storage unit 1403 may store control information (e.g., information related to channel estimation generated using DMRS transmitted by PUSCH determined by the BS 1400) or data, or control information or data received from a terminal, and may have an area for storing data required for the control of the controller 1404 and data generated by the control of the controller 1404. The controller 1404 may control a series of processes so that the BS 1400 may operate according to the above-mentioned embodiments of the present disclosure. For example, the controller 1404 may execute or control the operation of the BS to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. The controller 1404 may include at least one processor, a communication processor (CP) that performs communication control, and an application processor (AP) that controls a high layer (e.g., an application).

[0335] The methods according to the embodiments described in the claims or the specification of the present disclosure may be implemented in hardware, software, or a combination of hardware and software.

[0336] In terms of software, a computer-readable storage medium storing one or more programs (software modules) may be provided. One or more programs stored in the computer-readable storage medium may be configured to be executed by one or more processors of an electronic device. One or more programs may include instructions for controlling an electronic device to perform the method of the present disclosure.

[0337] Such a program (software module, software) may be stored in a random access memory, a non-volatile memory including a flash memory, a read-only memory (ROM), an electrically erasable programmable ROM (EEPROM), a magnetic disk storage device, a compact disc (CD)-ROM, a digital versatile disk (DVD) or other optical storage device, and a cassette tape. Alternatively, the program may be stored in a memory combining some or all of these recording media. A plurality of memories may be included.

[0338] The program may be stored in an attachable storage device that is accessible via a communication network such as the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), or a storage area network (SAN), or a communication network that combines these networks. Such a storage device may be accessed through an external port to the device that performs the embodiments of the present disclosure. In addition, an independent storage device on a communication network may be accessed to the device that performs the embodiments of the present disclosure.

[0339] In this article, each box of the flowchart diagram and the combination of boxes in the flowchart diagram can be implemented by computer program instructions, which can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device create a device for implementing the functions specified in one or more flowchart boxes. These computer program instructions can also be stored in a computer-usable or computer-readable memory, which can instruct the computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-usable or computer-readable memory produce an article including an instruction device, which implements the functions specified in the one or more flowchart boxes. The computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are performed on the computer or other programmable device, thereby generating a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flowchart boxes.

[0340] Each frame of the flowchart diagram can represent module, code segment or code portion, and it comprises one or more executable instructions for realizing the specified logical function.In some alternative implementations, the function of marking in the frame can not occur in order.For example, two frames shown continuously can in fact be performed substantially simultaneously, or frame can sometimes be performed in reverse order, specifically depending on the functionality involved.

[0341] A part of an embodiment of the present disclosure may be combined with a part of another embodiment to operate a BS and a terminal. Although the above embodiments have been presented based on a frequency division duplex (FDD) LTE system, other variations based on the technical ideas of the above embodiments may also be implemented in other systems such as time division duplex (TDD) LTE and 5G or NR systems.

[0342] While the present disclosure has been described with reference to various embodiments, various changes may be made without departing from the spirit and scope of the present disclosure, which is defined not by the detailed description and embodiments but 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: receiving configuration information associated with at least one first reference signal RS from a base station; receiving, from the base station, reconfiguration information associated with at least one second RS; as well as Based on the configuration information and the reconfiguration information, identifying a path loss reference signal PL-RS for measuring a downlink path loss, The first transmission density of the at least one first RS is greater than the second transmission density of the at least one second RS.

2. The method according to claim 1, in, The PL-RS is identified based on whether at least two transmission resources of the at least one first RS and the at least one second RS overlap, and Wherein, when the at least two transmission resources do not overlap, the downlink path loss is measured based on the at least one first RS.

3. The method according to claim 2, in, In case a portion of the at least two transmission resources overlap, the downlink path loss is measured based on RSs corresponding to non-overlapping transmissions.

4. The method according to claim 2, in, In the case where the at least two transmission resources completely overlap, the downlink path loss is measured based on a synchronization signal block SSB used for initial access.

5. A method performed by a base station in a wireless communication system, the method comprising: Transmitting configuration information associated with at least one first reference signal RS to a user equipment UE; as well as transmitting reconfiguration information associated with at least one second RS to the UE, wherein a path loss reference signal PL-RS for measuring a downlink path loss is identified based on the configuration information and the reconfiguration information, and The first transmission density of the at least one first RS is greater than the second transmission density of the at least one second RS.

6. The method according to claim 5, in, The PL-RS is identified based on whether at least two transmission resources of the at least one first RS and the at least one second RS overlap, and Wherein, when the at least two transmission resources do not overlap, the downlink path loss is measured based on the at least one first RS.

7. The method according to claim 6, in, In case a portion of the at least two transmission resources overlap, the downlink path loss is measured based on RSs corresponding to non-overlapping transmissions.

8. The method according to claim 6, in, In the case where the at least two transmission resources completely overlap, the downlink path loss is measured based on a synchronization signal block SSB used for initial access.

9. A user equipment UE in a wireless communication system, the UE comprising: Transceiver; as well as At least one processor connected to the transceiver and configured to: receiving configuration information associated with at least one first reference signal RS from a base station, receiving reconfiguration information associated with at least one second RS from the base station, and Based on the configuration information and the reconfiguration information, identifying a path loss reference signal PL-RS for measuring a downlink path loss, The first transmission density of the at least one first RS is greater than the second transmission density of the at least one second RS.

10. The UE according to claim 9, in, The PL-RS is identified based on whether at least two transmission resources of the at least one first RS and the at least one second RS overlap, and Wherein, when the at least two transmission resources do not overlap, the downlink path loss is measured based on the at least one first RS.

11. The UE according to claim 10, in, In case a portion of the at least two transmission resources overlap, the downlink path loss is measured based on RSs corresponding to non-overlapping transmissions.

12. The UE according to claim 10, in, In the case where the at least two transmission resources completely overlap, the downlink path loss is measured based on a synchronization signal block SSB used for initial access.

13. A base station in a wireless communication system, the base station comprising: Transceiver; as well as At least one processor connected to the transceiver and configured to: transmitting configuration information associated with at least one first reference signal RS to a user equipment UE, and transmitting reconfiguration information associated with at least one second RS to the UE, wherein a path loss reference signal PL-RS for measuring a downlink path loss is identified based on the configuration information and the reconfiguration information, and The first transmission density of the at least one first RS is greater than the second transmission density of the at least one second RS.

14. The base station according to claim 13, in, The PL-RS is identified based on whether at least two transmission resources of the at least one first RS and the at least one second RS overlap, and Wherein, when the at least two transmission resources do not overlap, the downlink path loss is measured based on the at least one first RS.

15. The base station according to claim 14, in, In case a portion of the at least two transmission resources overlap, the downlink path loss is measured based on RSs corresponding to non-overlapping transmissions, and Wherein, in the case where the at least two transmission resources completely overlap, the downlink path loss is measured based on the synchronization signal block SSB used for initial access.

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