Multi-SSB type-based energy saving method and device for energy saving in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present disclosure discloses a method and a device in which a base station performs different types of SSB transmission for energy saving of the base station in a communication system, and a terminal performs a request for transmission of an on-demand channel or signal to the base station through WUS transmission.

Description

Multi-SSB type-based energy saving method and device for energy saving of wireless communication systems

[0001] The present disclosure relates to the operation of a terminal and a base station in a wireless communication system. Specifically, the present disclosure relates to a method and apparatus for energy saving in a wireless communication system.

[0002] 5G mobile communication technology defines a wide frequency band to enable fast transmission speeds and new services, and can be implemented not only in frequency bands below 6 GHz ('Sub 6 GHz'), such as 3.5 gigahertz (3.5 GHz), but also in ultra-high frequency bands called millimeter waves (mmWave), such as 28 GHz and 39 GHz ('Above 6 GHz'). In addition, for 6G mobile communication technology, which is referred to as a system beyond 5G, implementation in the terahertz band (e.g., the 3 terahertz (3 THz) band at 95 GHz) is being considered to achieve transmission speeds 50 times faster and ultra-low latency reduced to one-tenth compared to 5G mobile communication technology.

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

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

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

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

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

[0008] With the recent development of 5G / 6G communication systems that take the environment into account, there is a growing need for methods to reduce energy consumption or save energy in communication systems (e.g., terminals, base stations, networks, etc.).

[0009] The present disclosure proposes a method and apparatus for performing different types of SSB transmission to reduce the energy consumption of a base station. It also proposes a signal transmission and reception procedure between a base station and a terminal according to different types of SSB. The technical problems to be solved by the present disclosure are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present disclosure pertains from the description below.

[0010] A method according to one embodiment of the present disclosure comprises the step of receiving a discovery reference signal (DRS) from a base station, wherein the DRS further comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) indicated by the PBCH, and wherein the DRS includes wake-up signal (WUS) setting information; and the step of transmitting a WUS requesting the transmission of an on-demand SSB (OD-SSB) or a normal SSB (normal SSB) to the base station based on the WUS setting information, wherein the WUS setting information includes a plurality of pre-set information.

[0011] In addition, a method performed by a base station of a communication system comprises the step of transmitting a discovery reference signal (DRS) to a terminal, wherein the DRS further comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) directed by the PBCH, and wherein the DRS includes wake-up signal (WUS) setting information; and the step of receiving a WUS corresponding to the WUS setting information from the terminal, wherein the WUS requests the transmission of an on-demand SSB (OD-SSB) or a normal SSB (normal SSB), and wherein the WUS setting information includes a plurality of pre-set information.

[0012] A method performed by a base station of a communication system comprises: at least one transceiver; at least one processor connected to communicate with the at least one transceiver; and a memory connected to communicate with the at least one processor and executable individually or in any combination thereof, wherein the base station transmits a discovery reference signal (DRS) to a terminal, the DRS further comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) indicated by the PBCH, the DRS includes wake-up signal (WUS) setting information, and stores a command to receive a WUS corresponding to the WUS setting information from the terminal; It includes, and the WUS requests the transmission of an OD-SSB (on-demand SSB) or a normal SSB (normal SSB), and the WUS configuration information is characterized by including a plurality of pre-configured information.

[0013] The various embodiments of the present disclosure described above are merely some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the various embodiments of the present disclosure can be derived and understood by those skilled in the art based on the detailed description to be described below.

[0014] According to one embodiment of the present disclosure, through different types of SSB transmission operations of a base station in a communication system, signals and channels (e.g., SSB or SIB1) that are conventionally transmitted periodically with a maximum number of antennas and high power are transmitted only when necessary, thereby reducing unnecessary energy consumption of the base station.

[0015] The effects obtainable from the present disclosure are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0016] FIG. 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0017] FIG. 2 is a drawing illustrating a slot structure considered in a wireless communication system according to one embodiment of the present disclosure.

[0018] FIG. 3 is a diagram illustrating an example of a time domain mapping structure of a synchronization signal and a beam sweeping operation according to one embodiment of the present disclosure.

[0019] FIG. 4 is a drawing illustrating an example of a synchronization signal block considered in a wireless communication system according to one embodiment of the present disclosure.

[0020] FIG. 5 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a wireless communication system according to one embodiment of the present disclosure.

[0021] FIG. 6 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system according to one embodiment of the present disclosure.

[0022] FIG. 7 is a diagram illustrating transmission cases of a synchronization signal block according to a subcarrier interval within 5ms in a wireless communication system according to one embodiment of the present disclosure.

[0023] FIG. 8 is a diagram illustrating an example of DMRS patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0024] FIG. 9 is a diagram illustrating an example of channel estimation using DMRS received from one PUSCH in the time band of a wireless communication system according to one embodiment of the present disclosure.

[0025] FIG. 10 is a diagram illustrating a method for resetting SSB transmission through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0026] FIG. 11 is a diagram illustrating a method for resetting BWP and BW through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0027] FIG. 12 is a diagram illustrating an example of a method for resetting DRX through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0028] FIG. 13 is a drawing illustrating an example of a DTx method for base station energy saving according to one embodiment of the present disclosure.

[0029] FIG. 14 is a diagram illustrating an example of the operation of a base station according to a gNB WUS according to one embodiment of the present disclosure.

[0030] FIG. 15 is a diagram illustrating an example of an antenna adaptation method for a base station for energy saving of a wireless communication system according to one embodiment of the present disclosure.

[0031] FIG. 16 is a drawing illustrating an example of different types of SSB designs of a base station and a terminal according to one embodiment of the present disclosure.

[0032] FIG. 17 is a diagram illustrating an example of a synchronization raster setting considering multiple SSB types according to one embodiment of the present disclosure.

[0033] FIG. 18 is a diagram illustrating an example of an energy saving operation considering a single cell of a base station and a terminal according to one embodiment of the present disclosure.

[0034] FIG. 19 is a diagram illustrating an example of a timeline of a UL WUS response during an energy saving operation of a base station according to one embodiment of the present disclosure.

[0035] FIG. 20 is a drawing illustrating another example of a timeline for receiving an on-demand channel and a signal during an energy saving operation of a base station according to one embodiment of the present disclosure.

[0036] FIG. 21 is a drawing illustrating an example of the operation of a terminal applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0037] FIG. 22 is a flowchart of the operation of a base station applying an energy saving method of a wireless communication system according to one embodiment of the present disclosure.

[0038] FIG. 23 is a block diagram of a terminal according to one embodiment of the present disclosure.

[0039] FIG. 24 is a block diagram of a base station according to one embodiment of the present disclosure.

[0040] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the attached drawings.

[0041] In describing the embodiments of the present disclosure below, technical details that are well known in the technical field to which the present disclosure pertains and are not directly related to the present disclosure are omitted. This is intended to convey the essence of the present disclosure more clearly without obscuring it by omitting unnecessary explanations.

[0042] For the same reason, some components in the attached drawings have been exaggerated, omitted, or schematically depicted. Additionally, the dimensions of each component do not entirely reflect their actual dimensions. Identical or corresponding components in each drawing have been assigned the same reference numbers.

[0043] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments described below but may be implemented in various different forms. These embodiments are provided merely to ensure that the present disclosure is complete and to fully inform those skilled in the art of the scope of the technical concept to which the present disclosure pertains, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. Furthermore, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout the present specification.

[0044] Hereinafter, the base station is an entity that performs resource allocation for terminals and may be at least one of gNode B, eNode B, Node B, BS (base station), wireless access unit, base station controller, or a node on a network. The terminal may include UE (user equipment), MS (mobile station), cellular phone, smartphone, computer, or a multimedia system capable of performing communication functions. In the present disclosure, the downlink (DL) refers to the wireless transmission path of a signal transmitted by the base station to the terminal, and the uplink (UL) refers to the wireless transmission path of a signal transmitted by the terminal to the base station.

[0045] In addition, while LTE or LTE-A systems may be described below as examples, embodiments of the present disclosure may also be applied to other communication systems having similar technical backgrounds or channel types. For example, 5th generation mobile communication technologies (5G, new radio, NR) developed after LTE-A may be included, and the 5G below may be a concept that includes existing LTE, LTE-A, and other similar services. Furthermore, the present disclosure may be applied to other communication systems with some modifications made at the discretion of a person with skilled technical knowledge, without significantly departing from the scope of the present disclosure.

[0046] At this time, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing the means of instruction to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0047] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0048] As used in this disclosure, the term “part” refers to a software or hardware component, such as a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC), and the “part” performs certain roles. However, the “part” is not limited to software or hardware. The “part” may be configured to reside in an addressable storage medium or configured to run on one or more processors. Thus, by example, the “part” includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and “parts” may be combined into a smaller number of components and “parts” or further separated into additional components and “parts.” In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0049] The methods and devices proposed in the embodiments of the present disclosure below are not limited to each embodiment and may be utilized as a combination of all or part of the embodiments proposed in the disclosure. Accordingly, the embodiments of the present disclosure may be applied with some modifications within the scope that does not deviate significantly from the scope of the present disclosure, at the judgment of a person skilled in the art.

[0050] Wireless communication systems are evolving from providing early voice-oriented services to broadband wireless communication systems that provide high-speed, high-quality packet data services, such as 3GPP’s HSPA (high speed packet access), LTE (long term evolution or E-UTRA (evolved universal terrestrial radio access)), LTE-Advanced (LTE-A), LTE-Pro, 3GPP2’s HRPD (high rate packet data), UMB (ultra mobile broadband), and IEEE’s 802.17e communication standards.

[0051] In LTE systems, a representative example of broadband wireless communication systems, the orthogonal frequency division multiplexing (OFDM) method is adopted for the downlink, and the single carrier frequency division multiple access (SC-FDMA) method is adopted for the uplink. The uplink refers to a wireless link through which a terminal transmits data or control signals to a base station, and the downlink refers to a wireless link through which a base station transmits data or control signals to a terminal. Furthermore, the aforementioned multiple access method typically ensures that the time-frequency resources to be used to transmit data or control information for each user do not overlap—that is, that orthogonality is established—by allocating and operating them in such a way that the data or control information of each user is distinguished.

[0052] 5G communication systems, which are communication systems following LTE, must support services that simultaneously satisfy various requirements so as to freely reflect the diverse needs of users and service providers. Services considered for 5G communication systems include enhanced mobile broadband (eMBB), massive machine type communication (mMTC), or ultra reliability low latency communication (URLC).

[0053] eMBB aims to provide data transmission speeds that are superior to those supported by existing LTE, LTE-A, or LTE-Pro. For example, in a 5G communication system, eMBB must be able to provide a peak data rate of 20 Gbps in the downlink and 10 Gbps in the uplink from the perspective of a single base station. Furthermore, while providing the peak data rates, the 5G communication system must also provide an increased user-perceived data rate. To satisfy these requirements, improvements in various transmission and reception technologies, including enhanced multi-input multi-output (MIMO) transmission technology, may be required. Additionally, while LTE systems transmit signals using a maximum transmission bandwidth of 20 MHz in the 2 GHz band, 5G communication systems can meet the data transmission speeds required by the 5G communication system by using a frequency bandwidth wider than 20 MHz in frequency bands of 3 to 6 GHz or above 6 GHz.

[0054] At the same time, mMTC is being considered to support application services such as the Internet of Things (IoT) in 5G communication systems. To efficiently provide IoT, mMTC requires support for the connection of a large number of terminals within a cell, improved terminal coverage, enhanced battery life, and reduced terminal costs. Since IoT provides communication functions by attaching various sensors and diverse devices, a large number of terminals (e.g., 1,000,000 terminals / km²) are required within a cell. 2 It must be able to support mMTC. In addition, terminals supporting mMTC require wider coverage compared to other services provided by the 5G communication system, as they are likely to be located in dead zones where cells cannot cover, such as building basements, due to the nature of the service. Terminals supporting mMTC must be low-cost devices, and because it is difficult to frequently replace the device's battery, they require a very long battery life of 10 to 16 years.

[0055] Finally, URLLC is a mission-critical cellular-based wireless communication service. For example, consider services used for remote control of robots or machinery, industrial automation, unmanned aerial vehicles, remote health care, or emergency alerts. Therefore, the communication provided by URLLC must offer very low latency and very high reliability. For example, services supporting URLLC must satisfy air interface latency of less than 0.5 milliseconds, and simultaneously 10 -5The following packet error rate requirements must be satisfied. Therefore, for services supporting URLLC, 5G systems must provide a transmit time interval (TTI) smaller than other services, and at the same time, allocate a wide resource in the frequency band to ensure the reliability of the communication link.

[0056] Three services of a 5G communication system (hereinafter interchangeable with 5G systems), namely eMBB, URLLC, and mMTC, can be multiplexed and transmitted within a single system. To satisfy the different requirements of each service, different transmission and reception techniques and transmission and reception parameters may be used between the services.

[0057] The frame structure of a 5G system will be described in more detail below with reference to the drawings. For convenience of explanation, the wireless communication system to which the present disclosure applies will be described below using the configuration of a 5G system as an example; however, the embodiments of the present disclosure may be applied in the same or similar manner to systems of 5G or higher or other communication systems to which the present disclosure is applicable.

[0058] FIG. 1 is a diagram illustrating the basic structure of the time-frequency domain, which is a wireless resource domain in a wireless communication system according to one embodiment of the present disclosure.

[0059] In FIG. 1, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. In the time and frequency domains, the basic unit of a resource is a resource element (RE, 101), which can be defined as one OFDM symbol (or DFT-s-OFDM (discrete Fourier transform spread OFDM) symbol) (102) on the time axis and one subcarrier (103) on the frequency axis. In the frequency domain, the number of subcarriers per resource block (RB) is indicated. (For example, 12) consecutive REs can form a single resource block (104). Additionally, representing the number of symbols per subframe according to a set value μ for subcarrier spacing (SCS) in the time domain. A number of consecutive OFDM symbols can form a subframe (110).

[0060] FIG. 2 is a drawing illustrating a slot structure considered in a wireless communication system according to one embodiment of the present disclosure.

[0061] FIG. 2 illustrates an example of a slot structure comprising a frame (200), a subframe (201), and slots (202, 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 consist of a total of 10 subframes (201). One slot (202, 203) may be defined as 14 OFDM symbols (i.e., the number of symbols per slot ( ))=14). One subframe (201) may be composed of one or more slots (202, 203), and the number of slots (202, 203) per one subframe (201) may vary depending on μ (204 or 205), which is a setting value for the subcarrier interval.

[0062] The slot structure for cases where the subcarrier spacing setting value is μ=0 (204) and μ=1 (205) is illustrated. When μ=0 (204), one subframe (201) may be composed of one slot (202), and when μ=1 (205), one subframe (201) may be composed of two slots (e.g., including slot (203)). That is, depending on the setting value μ for the subcarrier spacing, the number of slots per subframe ( )) may vary, and accordingly, the number of slots per frame ( ) may vary. For example, depending on the setting μ for each subcarrier interval. and It can be defined by Table 1 below.

[0063] μ 0141011142022144043148084141601651432032

[0064] In a 5G wireless communication system, a synchronization signal block (SSB, which may be used interchangeably with an SS block or an SS / PBCH block) may be transmitted for the initial connection of a terminal, and the synchronization signal block may include a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel).

[0065] In the initial access phase, when the terminal connects to the system, the terminal can first obtain downlink time and frequency domain synchronization from the synchronization signal through a cell search and acquire a cell ID. The synchronization signal may include PSS and SSS. The terminal can then receive a PBCH transmitting a Master Information Block (MIB) from the base station to obtain system information related to transmission and reception, such as system bandwidth or related control information, as well as basic parameter values. Based on this information, the terminal can obtain a System Information Block (SIB) by performing decoding on the Physical Downlink Control Channel (PDCCH) and Physical Downlink Shared Channel (PDSCH). Subsequently, the terminal can initially connect to the network by exchanging identification information with the base station through a random access phase and undergoing registration and authentication steps. Additionally, the terminal can obtain cell-common transmission and reception control information by receiving a System Information Block (SIB) transmitted by the base station. The above cell common transmission and reception control information may include random access control information, paging control information, and common control information for various physical channels.

[0066] The synchronization signal serves as a reference for cell search, and subcarrier spacing can be applied for each frequency band to suit channel environments such as phase noise. In the case of data channels or control channels, as described above, subcarrier spacing may be applied differently depending on the service type to support various services.

[0067] FIG. 3 is a diagram illustrating an example of a time domain mapping structure of a synchronization signal and a beam sweeping operation according to one embodiment of the present disclosure.

[0068] For the purpose of explanation, the following components may be defined.

[0069] - PSS: Provides some cell ID information as a reference signal for DL ​​time / frequency synchronization.

[0070] - SSS: Serves as the reference for DL ​​time / frequency synchronization and provides the cell ID and some other information. Additionally, it can serve as a reference signal (RS) for PBCH demodulation.

[0071] - PBCH: Provides MIB, which is essential system information required for the transmission and reception of the terminal's data and control channels. The said essential system information may include control information related to the search space representing wireless resource mapping information of the control channel, scheduling control information for a separate data channel transmitting system information, and information such as the SFN (system frame number), which is a frame-unit index serving as a timing reference.

[0072] - SS / PBCH Block: An SS / PBCH block consists of N OFDM symbols and is formed by a combination of PSS, SSS, PBCH, etc. In systems where beam sweeping technology is applied, the SS / PBCH block is the minimum unit to which beam sweeping is applied. In a 5G system, N can be 4. A base station can transmit up to L SS / PBCH blocks, and the L SS / PBCH blocks are mapped within a half frame (0.5ms). The L SS / PBCH blocks are repeated periodically in units of a predetermined period P. The base station can notify the terminal of the period P through signaling. If there is no separate signaling for the period P, the terminal applies a pre-agreed default value.

[0073] Referring to FIG. 3, beam sweeping can be applied in units of SS / PBCH blocks over time. In the case of Terminal 1 (305), at time t1 (301), it receives an SS / PBCH block using a beam radiated in the direction of #d0 (303) by beamforming applied to SS / PBCH block #0. Then, at time t2 (302), Terminal 2 (306) receives an SS / PBCH block using a beam radiated in the direction of #d4 (304) by beamforming applied to SS / PBCH block #4. The terminal can obtain an optimal synchronization signal through a beam radiated from the base station in the direction where the terminal is located. For example, it may be difficult for Terminal 1 (305) to obtain time / frequency synchronization and essential system information from an SS / PBCH block through a beam radiated in the direction of #d4, which is far from the location of Terminal 1.

[0074] In addition to the initial connection procedure, the terminal may also receive SS / PBCH blocks to determine whether the radio link quality of the current cell is maintained above a certain level. Furthermore, during the handover procedure in which the terminal moves the connection from the current cell to an adjacent cell, the terminal may receive SS / PBCH blocks from the adjacent cell to determine the radio link quality of the adjacent cell and to obtain time / frequency synchronization with the adjacent cell.

[0075] Below, the cell initial connection operation procedure of a 5G wireless communication system will be explained in more detail with reference to the drawings.

[0076] Synchronization signals serve as reference signals for cell search and can be transmitted with subcarrier spacing applied to suit the channel environment (e.g., phase noise) for each frequency band. 5G base stations can transmit multiple synchronization signal blocks depending on the number of analog beams to be operated. For example, PSS and SSS can be mapped and transmitted across 12 RBs, while PBCH can be mapped and transmitted across 24 RBs. The structure of synchronization signal and PBCH transmission in a 5G communication system is described below.

[0077] FIG. 4 is a drawing illustrating an example of a synchronization signal block considered in a wireless communication system according to one embodiment of the present disclosure.

[0078] Referring to FIG. 4, the synchronization signal block (400) may include PSS (401), SSS (403), and PBCH (402).

[0079] The synchronization signal block (400) can be mapped to four OFDM symbols (404) in the time axis. The PSS (401) and SSS (403) can be transmitted at 12 RB (405) in the frequency axis and at the first and third OFDM symbols in the time axis, respectively. In a 5G system, for example, a total of 1008 different cell IDs can be defined. Depending on the physical cell ID (PCI) of the cell, the PSS (401) can have three different values, and the SSS (403) can have 336 different values. The terminal can obtain one of the 1008 cell IDs (336 x 3 = 1008) as a combination through detection of the PSS (401) and SSS (403). This can be expressed by the following Equation 1.

[0080] [Mathematical Formula 1]

[0081]

[0082] Here can be estimated from SSS(403) and can have a value between 0 and 335. can be estimated from PSS (401) and can have a value between 0 and 2. The terminal class The cell ID is a combination of The value can be estimated.

[0083] The PBCH (402) can be transmitted from a resource containing 6 RBs (407, 408) on each side excluding the middle 12 RBs (405), with 24 RBs (406) in the frequency axis and SSS (403) in the 2nd to 4th OFDM symbols of the SS block in the time axis being transmitted. The PBCH (402) may include a PBCH payload and a PBCH DMRS (demodulation reference signal), and various system information called MIB may be transmitted in the PBCH payload. For example, the MIB may include information such as that shown in Table 2 below.

[0084] MIB ::= SEQUENCE {systemFrameNumber BIT STRING (SIZE (6)),subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},ssb-SubcarrierOffset INTEGER (0..15),dmrs-TypeA-Position ENUMERATED {pos2, pos3},pdcch-ConfigSIB1 PDCCH-ConfigSIB1,cellBarred ENUMERATED {barred, notBarred},intraFreqReselection ENUMERATED {allowed, notAllowed},spare BIT STRING (SIZE (1))}

[0085] - Synchronization signal block information: The frequency domain offset of the synchronization signal block can be indicated through the 4-bit ssb-SubcarrierOffset in the MIB. The index of the synchronization signal block containing the PBCH can be obtained indirectly through PBCH DMRS and PBCH decoding. In one embodiment, in a frequency band below 6 GHz, 3 bits obtained through PBCH DMRS decoding indicate the synchronization signal block index, and in a frequency band above 6 GHz, a total of 6 bits, including 3 bits obtained through PBCH DMRS decoding and 3 bits included in the PBCH payload obtained from PBCH decoding, can indicate the synchronization signal block index containing the PBCH.

[0086] - PDCCH configuration information: The subcarrier spacing of the common downlink control channel can be indicated through 1 bit (subCarrierSpacingCommon) in the MIB, and the time-frequency resource configuration information of the CORESET (control resource set) and seek space can be indicated through 8 bits (pdcch-ConfigSIB1).

[0087] - SFN: Within the MIB, 6 bits (systemFrameNumber) can be used to indicate part of the SFN. The 4 bits of the SFN's least significant bit (LSB) are included in the PBCH payload, and the terminal can obtain them indirectly through PBCH decoding.

[0088] - Timing information within a radio frame: With the synchronization signal block index described above and the 1 bit (half frame) obtained through PBCH decoding included in the PBCH payload, the terminal can indirectly check whether the synchronization signal block was transmitted in the first or second half frame of the radio frame.

[0089] Since the transmission bandwidth (12 RB (405)) of PSS (401) and SSS (403) and the transmission bandwidth (24 RB (406)) of PBCH (402) are different, in the first OFDM symbol where PSS (401) is transmitted within the transmission bandwidth of PBCH (402), there are 6 RBs (407, 408) on both sides excluding the 12 RB in the middle where PSS (401) is transmitted, and the area may be used to transmit other signals or be empty.

[0090] Synchronization signal blocks can be transmitted using the same analog beam. For example, PSS (401), SSS (403), and PBCH (402) can all be transmitted on the same beam. Since analog beams have the characteristic that they cannot be applied differently in the frequency axis, the same analog beam can be applied to all frequency axis RBs within a specific OFDM symbol to which a specific analog beam is applied. For example, four OFDM symbols in which PSS (401), SSS (403), and PBCH (402) are transmitted can all be transmitted on the same analog beam.

[0091] FIG. 5 is a diagram illustrating various transmission cases of a synchronization signal block in a frequency band below 6 GHz considered in a wireless communication system according to one embodiment of the present disclosure.

[0092] Referring to FIG. 5, in a 5G communication system, in a frequency band of 6 GHz or lower (or FR1 (frequency range 1), for example, 410 MHz to 7125 MHz), a subcarrier interval of 15 kHz (520) and a subcarrier interval of 30 kHz (530, 540) may be used for the transmission of a synchronization signal block. In the 15 kHz subcarrier interval (520), there is one transmission case for the synchronization signal block (e.g., Case #1 (501)), and in the 30 kHz subcarrier interval (530, 540), there may be two transmission cases for the synchronization signal block (e.g., Case #2 (502) and Case #3 (503)).

[0093] In case #1 (501) at a subcarrier interval of 15 kHz (520) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 1 ms (504) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols). In an example of FIG. 4, synchronization signal block #0 (507) and synchronization signal block #1 (508) are shown. For example, synchronization signal block #0 (507) can be mapped to four consecutive symbols starting from the 3rd OFDM symbol, and synchronization signal block #1 (508) can be mapped to four consecutive symbols starting from the 9th OFDM symbol.

[0094] Different analog beams may be applied to synchronization signal block #0 (507) and synchronization signal block #1 (508). Also, the same beam may be applied to all 3rd to 6th OFDM symbols mapped to synchronization signal block #0 (507), and the same beam may be applied to all 9th ​​to 12th OFDM symbols mapped to synchronization signal block #1 (508). For the 7th, 8th, 13th, and 14th OFDM symbols that are not mapped to synchronization signal blocks, the analog beam to be used may be freely determined at the discretion of the base station.

[0095] In case #2 (502) at a subcarrier interval of 30 kHz (530) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (505) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, up to four synchronization signal blocks can be transmitted within a time of 1 ms (or corresponding to the length of two slots if one slot consists of 14 OFDM symbols). In an example of FIG. 4, a case is illustrated in which synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512) are transmitted within a time of 1 ms (i.e., two slots). Synchronization signal block #0 (509) and synchronization signal block #1 (510) can be mapped starting from the 5th OFDM symbol and 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (511) and synchronization signal block #3 (512) can be mapped starting from the 3rd OFDM symbol and 7th OFDM symbol of the second slot, respectively.

[0096] Different analog beams may be applied to each of the synchronization signal block #0 (509), synchronization signal block #1 (510), synchronization signal block #2 (511), and synchronization signal block #3 (512). Additionally, the same analog beam may be applied to each of the 5th to 8th OFDM symbols in the first slot where synchronization signal block #0 (509) is transmitted, the 9th to 12th OFDM symbols in the first slot where synchronization signal block #1 (510) is transmitted, the 3rd to 6th symbols in the second slot where synchronization signal block #2 (511) is transmitted, and the 7th to 10th symbols in the second slot where synchronization signal block #3 (512) is transmitted. For OFDM symbols where the synchronization signal block is not mapped, the analog beam to be used may be freely determined at the discretion of the base station.

[0097] In case #3 (503) at a subcarrier interval of 30 kHz (540) in FIG. 5, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (506) (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, up to four synchronization signal blocks can be transmitted within a time of 1 ms (or corresponding to the length of two slots if one slot consists of 14 OFDM symbols). In an example of FIG. 4, synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516) are shown being transmitted within a time of 1 ms (i.e., two slots). Synchronization signal block #0 (513) and synchronization signal block #1 (514) can be mapped starting from the 3rd OFDM symbol and 9th OFDM symbol of the first slot, respectively, and synchronization signal block #2 (515) and synchronization signal block #3 (516) can be mapped starting from the 3rd OFDM symbol and 9th OFDM symbol of the second slot, respectively.

[0098] Different analog beams may be used for each of the synchronization signal block #0 (513), synchronization signal block #1 (514), synchronization signal block #2 (515), and synchronization signal block #3 (516). As described in the examples above, the same analog beam may be used for all four OFDM symbols in which each synchronization signal block is transmitted, and for OFDM symbols in which the synchronization signal block is not mapped, the choice of which beam to use may be freely determined by the base station.

[0099] FIG. 6 is a diagram illustrating transmission cases of a synchronization signal block in a frequency band of 6 GHz or higher considered in a wireless communication system according to one embodiment of the present disclosure.

[0100] Referring to FIG. 6, in a wireless communication system, in a frequency band of 6 GHz or higher (or FR2, for example, 24250 MHz-52600 MHz), a subcarrier spacing of 120 kHz (630), as in the example of Case #4 (610), and a subcarrier spacing of 240 kHz (640), as in the example of Case #5 (620), can be used for the transmission of synchronization signal blocks.

[0101] In case #4 (610) of a subcarrier interval of 120 kHz (630), up to four synchronization signal blocks can be transmitted within a time of 0.25 ms (601) (or, if one slot consists of 14 OFDM symbols, the length of two slots). In an example of FIG. 6, a case is illustrated in which synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606) are transmitted within 0.25 ms (i.e., two slots). Synchronization signal block #0 (603) and synchronization signal block #1 (604) can each be mapped to four consecutive symbols starting from the 5th OFDM symbol of the first slot and to four consecutive symbols starting from the 9th OFDM symbol, and synchronization signal block #2 (605) and synchronization signal block #3 (606) can each be mapped to four consecutive symbols starting from the 3rd OFDM symbol of the second slot and to four consecutive symbols starting from the 7th OFDM symbol.

[0102] As described in the above embodiment, different analog beams may be used for each of the synchronization signal block #0 (603), synchronization signal block #1 (604), synchronization signal block #2 (605), and synchronization signal block #3 (606). In addition, the same analog beam may be used for all four OFDM symbols transmitted by each synchronization signal block, and for OFDM symbols that are not mapped to the synchronization signal block, the choice of which beam to use may be freely determined by the base station.

[0103] In case #5 (620) at a subcarrier interval of 240 kHz (640), up to 8 synchronization signal blocks can be transmitted within a time of 0.25 ms (602) (or corresponding to a length of 4 slots if 1 slot consists of 14 OFDM symbols). In an example of FIG. 6, a case is illustrated in which synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614) are transmitted within 0.25 ms (i.e., 4 slots).

[0104] Synchronization signal block #0 (607) and synchronization signal block #1 (608) can each be mapped to four consecutive symbols starting from the 9th OFDM symbol of the first slot and to four consecutive symbols starting from the 13th OFDM symbol, and synchronization signal block #2 (609) and synchronization signal block #3 (610) can each be mapped to four consecutive symbols starting from the 3rd OFDM symbol of the second slot and to four consecutive symbols starting from the 7th OFDM symbol, and synchronization signal block #4 (611), synchronization signal block #5 (612), and synchronization signal block #6 (613) can each be mapped to four consecutive symbols starting from the 5th OFDM symbol of the third slot, to four consecutive symbols starting from the 9th OFDM symbol and to four consecutive symbols starting from the 13th OFDM symbol, and synchronization signal block #7 (614) can be mapped to the 3rd OFDM symbol of the fourth slot It can be mapped to four consecutive symbols starting from the symbol.

[0105] As described in the above embodiment, different analog beams may be used for each of the synchronization signal block #0 (607), synchronization signal block #1 (608), synchronization signal block #2 (609), synchronization signal block #3 (610), synchronization signal block #4 (611), synchronization signal block #5 (612), synchronization signal block #6 (613), and synchronization signal block #7 (614). In addition, the same analog beam may be used for all four OFDM symbols transmitted by each synchronization signal block, and for OFDM symbols that are not mapped to the synchronization signal block, the choice of which beam to use may be freely determined by the base station.

[0106] FIG. 7 is a diagram illustrating transmission cases of a synchronization signal block according to a subcarrier interval within 5ms in a wireless communication system according to one embodiment of the present disclosure.

[0107] Referring to FIG. 7, in a 5G communication system, synchronization signal blocks can be transmitted periodically in units of, for example, a time interval of 5 ms (710, corresponding to 5 subframes or half frames).

[0108] In the frequency band below 3 GHz, up to 4 synchronization signal blocks can be transmitted within a time of 5 ms (710). In the frequency band between 3 GHz and 6 GHz, up to 8 synchronization signal blocks can be transmitted. In the frequency band above 6 GHz, up to 64 synchronization signal blocks can be transmitted. As described above, subcarrier spacings of 15 kHz and 30 kHz can be used in frequencies below 6 GHz.

[0109] In the example of FIG. 7, in case #1 (501) with a subcarrier interval of 15 kHz consisting of one slot of FIG. 5, a synchronization signal block can be mapped to the first and second slots in the frequency band below 3 GHz, allowing up to 4 (721) to be transmitted, and in the frequency band above 3 GHz and below 6 GHz, a synchronization signal block can be mapped to the first, second, third, and fourth slots, allowing up to 8 (722) to be transmitted. In case #2 (502) or case #3 (503) with a subcarrier interval of 30 kHz consisting of two slots of FIG. 5, a synchronization signal block can be mapped starting from the first slot in the frequency band below 3 GHz, allowing up to 4 (731, 741) to be transmitted, and in the frequency band above 3 GHz and below 6 GHz, a synchronization signal block can be mapped starting from the first and third slots, allowing up to 8 (732, 742) to be transmitted.

[0110] Subcarrier spacing of 120 kHz and 240 kHz can be used at frequencies above 6 GHz. In the example of FIG. 7, in case #4 (610) at a subcarrier spacing of 120 kHz consisting of two slots of FIG. 6, synchronization signal blocks in the frequency band above 6 GHz can be mapped starting from the 1st, 3rd, 5th, 7th, 11th, 13th, 15th, 17th, 21st, 23rd, 25th, 27th, 31st, 33rd, 35th, and 37th slots, so that up to 64 (751) can be transmitted. In the example of FIG. 7, in case #5 (620) at a subcarrier interval of 240 kHz consisting of 4 slots of FIG. 6, synchronization signal blocks in the over 6 GHz frequency band can be mapped starting from the 1st, 5th, 9th, 13th, 21st, 25th, 29th, and 33rd slots, so that up to 64 (761) can be transmitted.

[0111] The terminal can obtain a SIB after performing decoding of the PDCCH and PDSCH based on the system information contained in the received MIB. The SIB may include at least one of information related to uplink cell bandwidth, random access parameters, paging parameters, or parameters related to uplink power control.

[0112] Generally, a terminal can establish a wireless link with a network through a random access procedure based on network synchronization and system information acquired during the cell search process. Random access can utilize contention-based or contention-free methods. When a terminal performs cell selection and re-selection during the initial connection phase of a cell, a contention-based random access method may be used, for example, to transition from the RRC (radio resource control)_IDLE state to the RRC_CONNECTED state. Contention-free random access may be used to reset uplink synchronization when downlink data arrives, in the case of a handover, or for location measurement. Table 3 below illustrates the conditions (events) under which the random access procedure is triggered in a 5G system.

[0113] - Initial access from RRC_IDLE;- RRC Connection Re-establishment procedure;- DL or UL data arrival during RRC_CONNECTED when UL synchronization status is "non-synchronised";- UL data arrival during RRC_CONNECTED when there are no PUCCH resources for SR available;- SR failure;- Request by RRC upon synchronous reconfiguration (eg handover);- RRC Connection Resume procedure from RRC_INACTIVE;- To establish time alignment for a secondary TAG;- Request for Other SI;- Beam failure recovery;- Consistent UL LBT failure on SpCell.

[0114] The following describes a method for setting measurement times for RRM (radio resource management) based on synchronization signal blocks of a 5G wireless communication system.

[0115] The terminal receives the MeasObjectNR of MeasObjectToAddModList as a setting for SSB-based intra / inter-frequency measurements and CSI-RS (channel state information-reference signal)-based intra / inter-frequency measurements through upper layer signaling. For example, MeasObjectNR can be configured as shown in Table 4 below.

[0116] MeasObjectNR ::= SEQUENCE {ssbFrequency ARFCN-ValueNR OPTIONAL, -- Cond SSBorAssociatedSSBssbSubcarrierSpacing SubcarrierSpacing OPTIONAL, -- Cond SSBorAssociatedSSBsmtc1 SSB-MTC OPTIONAL, -- Cond SSBorAssociatedSSBsmtc2 SSB-MTC2 OPTIONAL, -- Cond IntraFreqConnectedrefFreqCSI-RS ARFCN-ValueNR OPTIONAL, -- Cond CSI-RSreferenceSignalConfig ReferenceSignalConfig,absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, -- Need RabsThreshCSI-RS-Consolidation ThresholdNR OPTIONAL, -- Need RnrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, -- Need RnrofCSI-RS-ResourcesToAverage INTEGER (2..maxNrofCSI-RS-ResourcesToAverage) OPTIONAL, -- Need RquantityConfigIndex INTEGER (1..maxNrofQuantityConfig),offsetMO Q-OffsetRangeList,cellsToRemoveList PCI-List OPTIONAL, -- Need NcellsToAddModList CellsToAddModList OPTIONAL, -- Need NblackCellsToRemoveList PCI-RangeIndexList OPTIONAL, -- Need NblackCellsToAddModList SEQUENCE (SIZE (1..maxNrofPCI-Ranges)) OF PCI-RangeElement OPTIONAL, -- Need NwhiteCellsToRemoveList PCI-RangeIndexList OPTIONAL, -- Need NwhiteCellsToAddModList SEQUENCE (SIZE (1..maxNrofPCI-Ranges)) OF PCI-RangeElement OPTIONAL, -- Need N...,[[freqBandIndicatorNR FreqBandIndicatorNR OPTIONAL, -- Need RmeasCycleSCell ENUMERATED {sf160, sf256, sf320, sf512, sf640, sf1024, sf1280} OPTIONAL -- Need R]],[[smtc3list-r16 SSB-MTC3List-r16 OPTIONAL, -- Need Rrmtc-Config-r16 SetupRelease {RMTC-Config-r16} OPTIONAL, -- Need Mt312-r16 SetupRelease { T312-r16} OPTIONAL -- Need M]]}.

[0117] The terms in Table 4 can perform the following functions, but are not limited thereto.

[0118] - ssbFrequency: Allows you to set the frequency of the synchronization signal associated with MeasObjectNR.

[0119] - ssbSubcarrierSpacing: Sets the subcarrier spacing of the SSB. FR1 can only be applied at 15 kHz or 30 kHz, and FR2 at 120 kHz or 240 kHz.

[0120] - smtc1: Represents the SS / PBCH block measurement timing configuration. It allows you to set the primary measurement timing configuration and configure the timing offset and duration for the SSB.

[0121] - smtc2: Allows setting secondary measurement timing configuration for SSBs associated with MeasObjectNRs having PCIs listed in pci-List.

[0122] In addition to this, it can be configured through other higher-level signaling, for example, SMTC can be configured to the terminal through SIB2 for intra-frequency, inter-frequency, and inter-RAT cell re-selection, or through reconfigurationWithSync for NR PSCell change and NR PCell change, and SMTC can also be configured to the terminal through SCellConfig for NR SCell addition.

[0123] The terminal can set the first SS / PBCH block measurement timing configuration (SMTC) by following periodicityAndOffset (providing periodicity and offset) through smtc1, which is set through upper layer signaling for SSB measurement. In one embodiment, the first subframe of each SMTC occasion can be started in a subframe of an SFN and SpCell satisfying the conditions of Table 5 below.

[0124] SFN mod T = (FLOOR (Offset / 10));if the Periodicity is larger than sf5: subframe = Offset mod 10;else: subframe = Offset or (Offset +5);with T = CEIL(Periodicity / 10).

[0125] If smtc2 is configured, for the cells indicated by the pci-List value of smtc2 within the same MeasObjectNR, the terminal may configure additional SMTCs according to the periodicity of the configured smtc2 and the offset and duration of smtc1. In addition, the terminal may configure smtcs and measure SSBs through smtc3list for smtc2-LP (with long periodicity) and IAB-MT (integrated access and backhaul - mobile termination) for the same frequency (e.g., frequencies for intra-frequency cell reselection) or different frequencies (e.g., frequencies for inter-frequency cell reselection). In one embodiment, the terminal may not consider SSBs transmitted in subframes other than the SMTC occasion for SSB-based RRM measurement at the configured ssbFrequency.

[0126] Base stations can utilize various multi-transmission and reception point (TRP) operation methods depending on serving cell and PCI settings. Among these, when two TRPs located at a physically separated distance have different PCIs, there are two possible methods for operating the two TRPs.

[0127] [Operation Method 1]

[0128] Two TRPs with different PCIs can be operated with two serving cell configurations.

[0129] The base station can configure channels and signals transmitted from different TRPs to be included within different serving cell configurations through operation method 1. That is, each TRP has an independent serving cell configuration, and the frequency band values ​​FrequencyInfoDL indicated by DownlinkConfigCommon within each serving cell configuration may indicate at least some overlapping bands. Since the multiple TRPs operate based on multiple ServCellIndexes (e.g., ServCellIndex #1 and ServCellIndex #2), it is possible for each TRP to use a separate PCI. That is, the base station can allocate one PCI per ServCellIndex.

[0130] In this case, if multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs have different PCIs (e.g., PCI #1 and PCI #2), and the base station can map a PCI suitable for each TRP by appropriately selecting the value of ServCellIndex indicated by the cell parameter in QCL-Info, and designate the SSB transmitted from either TRP 1 or TRP 2 as the source reference RS of the QCL configuration information. However, since this configuration applies a single serving cell configuration that can be used for the terminal's CA (carrier aggregation) to multiple TRPs, there is a problem of limiting the degree of freedom of the CA configuration or increasing the signaling burden.

[0131] [Operation Method 2]

[0132] Two TRPs with different PCIs can be operated in a single serving cell configuration.

[0133] Through Operation Method 2, the base station can configure channels and signals transmitted from different TRPs through a single serving cell configuration. Since the terminal operates based on a single ServCellIndex (e.g., ServCellIndex #1), it is impossible for it to recognize the PCI assigned to the second TRP (e.g., PCI #2). Although Operation Method 2 may offer greater freedom in CA configuration compared to the aforementioned Operation Method 1, if multiple SSBs are transmitted from TRP 1 and TRP 2, the SSBs will have different PCIs (e.g., PCI #1 and PCI #2), and the base station may be unable to map the PCI of the second TRP (e.g., PCI #2) through the ServCellIndex indicated by the cell parameter in QCL-Info. The base station may only be able to designate the SSB transmitted from TRP 1 as the source reference RS of the QCL configuration information, and it may be impossible to designate the SSB transmitted from TRP 2.

[0134] As described above, operation method 1 can perform multi-TRP operation for two TRPs with different PCIs through additional serving cell settings without additional specification support, but operation method 2 can operate based on the following additional terminal capability reports and base station configuration information.

[0135] The terminal capability report for operation method 2 may be as follows.

[0136] - The terminal may report to the base station via terminal capability that configuration for the serving cell's PCI and other additional PCIs is possible through upper-layer signaling from the base station. Such terminal capability may include two independent numbers, X1 and X2, or each X1 and X2 may be reported as an independent terminal capability.

[0137] - X1 represents the maximum number of additional PCIs that can be configured for the terminal, and the PCI may differ from the PCI of the serving cell; in this case, it refers to a case where the time domain position and periodicity of the SSB corresponding to the additional PCI are the same as the SSB of the serving cell.

[0138] - X2 represents the maximum number of additional PCIs that can be configured for the terminal, and in this case, the PCI may differ from the PCI of the serving cell. In this case, the time domain position and periodicity of the SSB corresponding to the additional PCI may differ from the SSB corresponding to the PCI reported as X1.

[0139] - By definition, PCIs corresponding to the values ​​reported as X1 and X2 cannot be set simultaneously.

[0140] - The values ​​reported as X1 and X2 through the terminal capability report can each have one integer value from 0 to 7.

[0141] - The values ​​reported as X1 and X2 may differ from the values ​​reported in FR1 and FR2.

[0142] The upper layer signaling settings for operation method 2 may be as follows.

[0143] - Based on the terminal capability report described above, the terminal may receive an upper layer signaling, SSB-MTCAdditionalPCI-r17, from the base station, and the upper layer signaling may include at least a plurality of additional PCIs having values ​​different from the serving cell, an SSB transmission power corresponding to each additional PCI, and an ssb-PositionInBurst corresponding to each additional PCI, and the maximum number of additional PCIs that can be set may be 7.

[0144] - The terminal can assume that the SSB corresponding to the additional PCI has the same center frequency, subcarrier spacing, and subframe number offset as the SSB of the serving cell, as an assumption regarding an additional PCI with a value different from that of the serving cell.

[0145] - The terminal may assume that the reference RS (e.g., SSB or CSI-RS) corresponding to the PCI of the serving cell is always connected to an active TCI state, and in the case of additionally configured PCIs having values ​​different from the serving cell, when there is one or more PCIs, it may assume that only one of those PCIs is connected to an active TCI state.

[0146] - If a terminal is configured with two different coresetPoolIndexes, and a reference RS corresponding to a serving cell PCI is connected to one or more active TCI states, and a reference RS corresponding to an additionally configured PCI having a different value from the serving cell is connected to one or more active TCI states, the terminal can expect that the active TCI state(s) connected to the serving cell PCI are connected to one of the two coresetPoolIndexes, and the active TCI state(s) connected to the additionally configured PCI having a different value from the serving cell are connected to the other coresetPoolIndexes.

[0147] The terminal capability reporting and upper layer signaling of the base station for the above-described operation method 2 can set an additional PCI with a value different from the PCI of the serving cell. If the above setting does not exist, the SSB corresponding to the additional PCI with a value different from the PCI of the serving cell, which cannot be designated as a source reference RS, can be used to designate it as the source reference RS of the QCL setting information. Furthermore, unlike the SSB that can be set for use in purposes such as RRM, mobility, or handover, such as the setting information for the SSB that can be set within the upper layer signaling smtc1 and smtc2, it can be used to serve as a QCL source RS to support multiple TRP operations having different PCIs.

[0148] Next, we will explain DMRS, one of the reference signals in the 5G system, in detail.

[0149] A DMRS may consist of multiple DMRS ports, and each port maintains orthogonality using CDM (code division multiplexing) or FDM (frequency division multiplexing) to prevent interference with one another. However, the term DMRS may be expressed using other terms depending on the user's intent and the purpose of use of the reference signal. The term DMRS is provided merely as a specific example to facilitate the explanation of the technical content of this disclosure and to aid in understanding the disclosure, and is not intended to limit the scope of this disclosure. In other words, it is obvious to those skilled in the art that the technical concept of this disclosure can be implemented with any reference signal.

[0150] FIG. 8 is a diagram illustrating an example of DMRS patterns (type 1 and type 2) used for communication between a base station and a terminal in a wireless communication system according to one embodiment of the present disclosure.

[0151] Two DMRS patterns can be supported in 5G systems.

[0152] Referring to FIG. 8, DMRS type 1 (801, 802) is illustrated, specifically 1 symbol pattern (801) and 2 symbol pattern (802). DMRS type 1 (801, 802) is a DMRS pattern with a comb 2 structure and can be composed of two CDM groups, and different CDM groups can be FDM.

[0153] In the 1 symbol pattern (801), frequency-phase CDM is applied to the same CDM group to distinguish two DMRS ports, and thus a total of four orthogonal DMRS ports can be configured. The 1 symbol pattern (801) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated by the illustrated number + 1000). In the 2 symbol pattern (802), time / frequency-phase CDM is applied to the same CDM group to distinguish four DMRS ports, and thus a total of eight orthogonal DMRS ports can be configured. The 2 symbol pattern (802) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated by the illustrated number + 1000).

[0154] Referring to Fig. 8, DMRS type 2 (803, 804) is illustrated and is a DMRS pattern structure in which FD-OCC (frequency domain orthogonal cover codes) are applied to frequency-adjacent subcarriers, and can be composed of three CDM groups, and different CDM groups can be FDM.

[0155] In the 1 symbol pattern (803), frequency-phase CDM is applied to the same CDM group to distinguish two DMRS ports, and thus a total of six orthogonal DMRS ports can be configured. The 1 symbol pattern (803) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated as the illustrated number + 1000). In the 2 symbol pattern (704), time / frequency-phase CDM is applied to the same CDM group to distinguish four DMRS ports, and thus a total of twelve orthogonal DMRS ports can be configured. The 2 symbol pattern (804) may include DMRS port IDs mapped to each CDM group (DMRS port IDs for the downlink may be indicated as the illustrated number + 1000).

[0156] As described above, in an NR system, two different DMRS patterns (e.g., DMRS type 1 (801, 802) or DMRS type 2 (803, 804)) can be configured, and each DMRS pattern can be configured to be either a one-symbol pattern (801, 803) or an adjacent two-symbol pattern (802, 804). Additionally, in an NR system, not only are DMRS port numbers scheduled, but the number of CDM groups scheduled together for PDSCH rate matching can also be configured and signaled. Furthermore, in the case of CP-OFDM (cyclic prefix based orthogonal frequency division multiplex), both of the two DMRS patterns described above may be supported in DL and UL, while in the case of DFT-S-OFDM (discrete Fourier transform spread OFDM), only DMRS type 1 (801, 802) among the DMRS patterns described above may be supported in UL.

[0157] Additionally, support may be provided to configure additional DMRS. Front-loaded DMRS refers to the first DMRS transmitted and received at the earliest symbol in the time domain among the DMRS, and additional DMRS refers to the DMRS transmitted and received at a symbol later than the front-loaded DMRS in the time domain. In an NR system, the number of additional DMRS can be configured from a minimum of 0 to a maximum of 3. Additionally, when additional DMRS is configured, the same pattern as the front-loaded DMRS may be assumed. In one embodiment, for the front-loaded DMRS, if information regarding whether the aforementioned DMRS pattern type is type 1 or type 2, information regarding whether the DMRS pattern is a one-symbol pattern or an adjacent two-symbol pattern, and information regarding the number of DMRS ports and CDM groups used are provided, then when additional DMRS is configured, it may be assumed that the additional DMRS has the same DMRS information as the front-loaded DMRS.

[0158] In one embodiment, the aforementioned downlink DMRS setting can be set through RRC signaling as shown in Table 6 below.

[0159] DMRS-DownlinkConfig ::= SEQUENCE {dmrs-Type ENUMERATED {type2} OPTIONAL, -- Need Sdmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} OPTIONAL, -- Need SmaxLength ENUMERATED {len2} OPTIONAL, -- Need SscramblingID0 INTEGER (0..65535) OPTIONAL, -- Need SscramblingID1 INTEGER (0..65535) OPTIONAL, -- Need SphaseTrackingRS SetupRelease {PTRS-DownlinkConfig} OPTIONAL, -- Need M...}

[0160] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition can set additional DMRS OFDM symbols, maxLength can set a 1-symbol DMRS pattern or a 2-symbol DMRS pattern, scramblingID0 and scramblingID1 can set scrambling IDs, and phaseTrackingRS can set the PTRS (phase tracking reference signal).

[0161] In addition, the aforementioned uplink DMRS settings can be configured through RRC signaling as shown in Table 7 below.

[0162] DMRS-UplinkConfig ::= SEQUENCE {dmrs-Type ENUMERATED {type2} OPTIONAL, -- Need Sdmrs-AdditionalPosition ENUMERATED {pos0, pos1, pos3} OPTIONAL, -- Need RphaseTrackingRS SetupRelease { PTRS-UplinkConfig} OPTIONAL, -- Need MmaxLength ENUMERATED {len2} OPTIONAL, -- Need StransformPrecodingDisabled SEQUENCE {scramblingID0 INTEGER (0..65535) OPTIONAL, -- Need SscramblingID1 INTEGER (0..65535) OPTIONAL, -- Need S...} OPTIONAL, -- Need RtransformPrecodingEnabled SEQUENCE {nPUSCH-Identity INTEGER (0..1007) OPTIONAL, -- Need SsequenceGroupHopping ENUMERATED {disabled} OPTIONAL, -- Need SsequenceHopping ENUMERATED {enabled} OPTIONAL, -- Need S...} OPTIONAL, -- Need R...}

[0163] Here, dmrs-Type can set the DMRS type, dmrs-AdditionalPosition can set additional DMRS OFDM symbols, phaseTrackingRS can set PTRS, and maxLength can set a 1-symbol DMRS pattern or a 2-symbol DMRS pattern. scramblingID0 and scramblingID1 can set scrambling IDs, nPUSCH-Identity can set the cell ID for DFT-s-OFDM, sequenceGroupHopping can disable sequence group hopping, and sequenceHopping can enable sequence hopping.

[0164] FIG. 9 is a diagram illustrating an example of channel estimation using DMRS received from a single PUSCH (physical uplink shared channel) in the time band of a wireless communication system according to one embodiment of the present disclosure.

[0165] Referring to Fig. 9, when performing channel estimation for data decoding using DMRS, in the frequency band, channel estimation can be performed within the precoding resource block group (PRG), which is the bundling unit, by using physical resource blocks (PRB) bundling linked to the system band. In addition, in the time unit, the channel can be estimated by assuming that only DMRS received from a single PUSCH has the same precoding.

[0166] The following describes the time domain resource allocation (TDRA) method for data channels in a 5G communication system. A base station can set a time domain resource allocation information table for downlink data channels (PDSCH) and uplink data channels (PUSCH) for a terminal using upper layer signaling (e.g., RRC signaling).

[0167] The base station may set up a table for PDSCH consisting of a maximum of maxNrofDL-Allocations = 17 entries, and for PUSCH, a table consisting of a maximum of maxNrofUL-Allocations = 17 entries. Time domain resource allocation information may include, for example, at least one of PDCCH-to-PDSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PDSCH scheduled by the received PDCCH is transmitted, denoted as K0) or PDCCH-to-PUSCH slot timing (corresponding to a slot-unit time interval between the time when the PDCCH is received and the time when the PUSCH scheduled by the received PDCCH is transmitted, denoted as K2), information on the position and length of the starting symbol for which the PDSCH or PUSCH is scheduled within the slot, and the mapping type of the PDSCH or PUSCH.

[0168] In one embodiment, time domain resource allocation information for PDSCH can be set to the terminal through RRC signaling as shown in Table 8 below.

[0169] PDSCH-TimeDomainResourceAllocationList information elementPDSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofDL-Allocations)) OF PDSCH-TimeDomainResourceAllocationPDSCH-TimeDomainResourceAllocation ::= SEQUENCE {k0 INTEGER(0..32) OPTIONAL, -- Need SmappingType ENUMERATED {typeA, typeB},startSymbolAndLength INTEGER (0..127)repetitionNumber ENUMERATED {n2, n3, n4, n5, n6, n7, n8, n16} OPTIONAL, -- Cond Formats1-0and1-1}

[0170] Here, k0 represents the PDCCH-to-PDSCH timing (i.e., the slot offset between DCI (downlink control information) and the scheduled PDSCH) in slot units, mappingType represents the PDSCH mapping type, startSymbolAndLength represents the starting symbol and length of the PDSCH, and repetitionNumber represents the number of PDSCH transmission occasions according to the slot-based repetition method.

[0171] In one embodiment, time domain resource allocation information for PUSCH can be set to the terminal through RRC signaling as shown in Table 9 below.

[0172] PUSCH-TimeDomainResourceAllocation information elementPUSCH-TimeDomainResourceAllocationList ::= SEQUENCE (SIZE(1..maxNrofUL-Allocations)) OF PUSCH-TimeDomainResourceAllocationPUSCH-TimeDomainResourceAllocation ::= SEQUENCE {k2 INTEGER(0..32) OPTIONAL, -- Need SmappingType ENUMERATED {typeA, typeB},startSymbolAndLength INTEGER (0..127)}PUSCH-Allocation-r16 ::= SEQUENCE {mappingType-r16 ENUMERATED {typeA, typeB} OPTIONAL, -- Cond NotFormat01-02-Or-TypeAstartSymbolAndLength-r16 INTEGER (0..127) OPTIONAL, -- Cond NotFormat01-02-Or-TypeAstartSymbol-r16 INTEGER (0..13) OPTIONAL, -- Cond RepTypeBlength-r16 INTEGER (1..14) OPTIONAL, -- Cond RepTypeBnumberOfRepetitions-r16 ENUMERATED {n1, n2, n3, n4, n7, n8, n12, n16} OPTIONAL, -- Cond Format01-02...}

[0173] Here, k2 represents the PDCCH-to-PUSCH timing (i.e., the slot offset between the DCI and the scheduled PUSCH) in slots, mappingType represents the PUSCH mapping type, startSymbolAndLength or StartSymbol and length represents the starting symbol and length of the PUSCH, and numberOfRepetitions represents the number of repetitions applied to the PUSCH transmission.

[0174] The base station may indicate to the terminal at least one of the entries in the table for time domain resource allocation information via L1 signaling (e.g., downlink control information (DCI)) (e.g., to the 'time domain resource allocation' field within the DCI). The terminal may obtain time domain resource allocation information for PDSCH or PUSCH based on the DCI received from the base station.

[0175] The following describes a method to reduce SSB density through dynamic signaling for base station energy saving in 5G systems.

[0176] FIG. 10 is a diagram illustrating a method for resetting SSB transmission through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure. FIG. 10 illustrates a method (1001) for resetting SSB transmission through bitmap-based group / cell common DCI.

[0177] Referring to FIG. 10, the terminal can receive ssb-PositionsInBurst = '11110000' (1002) from the base station through upper layer signaling (SIB1 or ServingCellConfigCommon). At a subcarrier interval of 30 kHz, up to two synchronization signal blocks can be transmitted within a time of 0.5 ms (or corresponding to the length of one slot if one slot consists of 14 OFDM symbols), and accordingly, the terminal can receive four synchronization signal blocks (SSB) within a time of 1 ms (or corresponding to the length of two slots if one slot consists of 14 OFDM symbols). At this time, the base station can reset the SSB transmission setting information by broadcasting the bitmap '1010xxxx' (1004) through the Group / Cell common DCI (1003) having nwes-RNTI (network energy saving-radio network temporary identifier, or es-RNTI) to reduce the density of SSB transmission for energy saving. At this time, the transmission of SS block #1 (1005) and SS block #3 (1006) can be canceled based on the bitmap (1004) set by the Group / Cell common DCI.

[0178] Additionally, the base station can reset the SSB-periodicity set via upper-layer signaling through the Group / Cell common DCI. Furthermore, by additionally setting timer information to indicate the application time of the Group / Cell common DCI, the base station can transmit SSBs using the SSB transmission information reset via the Group / Cell common DCI during the set timer. Subsequently, when the timer expires, the base station can operate with the SSB transmission information set via the existing upper-layer signaling. In this way, the setting can be changed from normal mode to energy-saving mode via the timer, and the SSB configuration information can be reset accordingly. Alternatively, the base station can set the application time and duration of the SSB configuration information reset via the Group / Cell common DCI to the terminal using Offset and Duration information. In this case, the terminal may not monitor SSBs for the Duration period from the moment it receives the Group / Cell common DCI or from the moment the Offset is applied.

[0179] The following describes BWP or BW adaptation methods through dynamic signaling for base station energy saving in 5G systems.

[0180] FIG. 11 is a diagram illustrating a method for resetting BWP and BW through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0181] Referring to FIG. 11, the terminal can operate as an activated BWP or BW through upper layer signaling and L1 signaling from the base station (1101). For example, a fixed power PSD B It can operate via a full 100MHz bandwidth. In this case, the base station uses the same power PSD for energy saving. BWith this, the BW and BWP can be adjusted to enable a narrower BW of 40 MHz for the terminal (1102). At this time, the adjustment operation of the BW or BWP for energy saving of the base station can be set to match the BWP and BW settings specifically set for the UE through the Group common DCI and Cell specific DCI (1103). For example, UE#0 and UE#1 may have different BWP configurations and locations. At this time, the BW and BWP of all terminals can be set to one identically to save energy by reducing the BW used by the base station. At this time, the BWP or BW in the operation for energy saving can be set to one or more, and this can be used to set the BWP per UE Group.

[0182] In describing the present disclosure, the term "upper layer signaling" may be a signaling corresponding to at least one or a combination of at least one of the following signalings.

[0183] - MIB

[0184] - SIB or SIB

[0185] - RRC

[0186] - MAC (medium access control) CE (control element)

[0187] In addition, L1 signaling may be a signaling corresponding to at least one or a combination of at least one of the following physical layer channels or signaling methods using signaling.

[0188] - PDCCH

[0189] - DCI

[0190] - Terminal-specific (UE-specific) DCI

[0191] - Group common DCI

[0192] - Common DCI

[0193] - Scheduling DCI (e.g., DCI used for the purpose of scheduling downlink or uplink data)

[0194] - Non-scheduling DCI (e.g., DCI not intended for scheduling downlink or uplink data)

[0195] - PUCCH (physical uplink control channel)

[0196] - UCI (uplink control information)

[0197] In the following disclosure, the examples are described through a plurality of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination.

[0198] In the following disclosure, the examples are described through a plurality of embodiments, but these are not independent, and one or more embodiments may be applied simultaneously or in combination. Additionally, A / B below may be understood as at least one of A or / and B, or A or B.

[0199] The following describes a discontinuous reception (DRX) alignment method using dynamic signaling for base station energy saving in 5G systems.

[0200] FIG. 12 is a diagram illustrating an example of a method for resetting DRX through dynamic signaling of a wireless communication system according to one embodiment of the present disclosure.

[0201] Referring to FIG. 12, the base station can set the DRX specifically for the UE through upper layer signaling. For example, different drx-LongCycle (1202) or drx-ShortCycle, drx-onDurationTimer (1203), and drx-InactivityTimer (1204) can be set for each terminal. Subsequently, for energy saving, the base station can set the UE-specific DRX settings specifically for the UE group or cell through L1 signaling (1201). Through this, the base station can obtain the same effect for energy saving as the terminal saves power through the DRX.

[0202] The following describes discontinuous transmission (DTx) operations to reduce energy consumption of base stations in 5G systems.

[0203] FIG. 13 is a drawing illustrating an example of a DTx method for base station energy saving according to one embodiment of the present disclosure.

[0204] Referring to FIG. 13, the base station can set up DTx for energy saving through upper layer signaling (e.g., SIB for DTx for new DTx or RRC signaling) and L1 signaling (e.g., DCI). At this time, the base station may set at least one of a dtx-onDurationTimer (1305) for transmitting a reference signal for measuring, beam management, path loss, etc., for PDCCH or RRM measurement, scheduling a DL SCH (downlink shared channel) for DTx operation; a dtx-InactivityTimer (1306) for receiving a PDSCH after the terminal receives a PDCCH scheduling a DL SCH; setting information for a synchronization signal (SS) (1303) for synchronization before the dtx-onDurationTimer; a dtx-offset (1304) for setting an offset between the SS and the dtx-onDurationTimer; and a dtx-(Long)Cycle (1302) for the DTx to operate periodically based on the setting information. At this time, the dtx-cycle may be set to multiple long cycles and short cycles.

[0205] During the operation of DTx, the base station considers the transmitter to be in an off (or inactive) state and therefore may not transmit the DL CCH (downlink control channel), DL SCH, and DL RS. That is, during the operation of DTx, the base station may transmit downlink signals and channels (e.g., PDCCH, PDSCH, RS, etc.) only during the SS, dtx-onDurationTimer, and dtx-InactivityTimer. At this time, additional information for the configured SS may be configured, such as the SS-gapbetweenBurst (the gap between SS bursts in the time domain) or the number of SS bursts.

[0206] The following describes a method for activating a base station via a gNB WUS (wake-up signal) during the base station's inactive mode to reduce energy consumption in a 5G system.

[0207] FIG. 14 is a diagram illustrating an example of the operation of a base station according to a gNB WUS according to one embodiment of the present disclosure.

[0208] Referring to FIG. 14, the base station may keep the transmitter in an Off (or inactive) state during the base station's inactive state (or sleep mode) for energy saving. Subsequently, the base station may receive a gNB WUS (1402) from the terminal to activate the base station's sleep mode. Subsequently, when the base station receives a WUS from the terminal via the Rx terminal, it may change the Tx terminal to an On (or active) state (1403). Subsequently, the base station may perform downlink transmission to the terminal. At this time, the base station may perform synchronization after Tx is turned on and perform control information and data transmission. At this time, various uplink signals, such as PRACH, scheduling request (SR PUCCH), and PUCCH including acknowledgment (ACK), may be considered as gNB WUS. Through the above method, the base station can perform energy saving, and at the same time, the terminal can improve latency.

[0209] At this time, the base station may set a WUS occasion for receiving the gNB WUS and a Sync RS for synchronization before the terminal transmits the gNB WUS. At this time, as the Sync RS, an SSB, TRS, Light SSB (PSS and SSS), consecutive SSBs, or new RS (continuous PSS and SSS) may be considered, and as the WUS, a PRACH, PUCCH with SR, or a sequence-based signal may be considered. The transmission of the Sync RS (1404) for the terminal to activate the base station's energy-saving disable mode and the WUS occasion for receiving the WUS may be repeated with WUS-RS periodicity (1405). In the case of FIG. 14, one embodiment is described by exemplifying a 1-to-1 mapping of the Sync RS and the WUS occasion, but the present disclosure is not limited thereto. For example, Sync and WUS occasion can be mapped N-to-1, 1-to-N, or N-to-M.

[0210] The following describes a method for dynamically turning on / off spatial domain elements (i.e., antennas, power amplifiers (PAs), or TxRUs (transceiver units or transmission radio units)) of a base station to save base station energy in a 5G system.

[0211] FIG. 15 is a diagram illustrating an example of an antenna adaptation method for a base station for energy saving of a wireless communication system according to one embodiment of the present disclosure.

[0212] Referring to FIG. 15, the base station can adjust the Tx antenna port per RU for network energy savings (NWES) (1501). For example, since the base station's PA accounts for most of the base station's energy consumption, the base station can turn off the Tx antenna to save energy. At this time, the base station may refer to / use the terminal's RSRP (reference signal received power), CQI (channel quality indicator), and RSRQ (reference signal received quality) to determine whether the Tx antenna can be turned off. The base station can transmit Tx by adjusting the number of activated Tx antennas per UE group or per UE. At this time, the base station may set information including one or more of beam information or reference signal information (e.g., one or more of CSI resource, CSI resource set, or CSI report) based on antenna on / off to the terminal through upper layer signaling (e.g., RRC signaling) or DCI signaling. In addition, the base station can set different antenna information for each BWP and reset the antenna information in response to changes in the BWP. Furthermore, the base station can receive CSI feedback from the terminal to determine the feasibility of spatial domain (SD) adaptation. The base station can determine SD adaptation (based on the CSI feedback). The base station can receive multiple feedback from the terminal through antenna structure hypotheses of various antenna patterns for SD adaptation.

[0213] More specifically, the base station may apply multiple types of SD adaptation (e.g., two types) for energy saving (1502). For example, the multiple types may include Type 1 SD adaptation (1503) and Type 2 SD adaptation (1504).

[0214] When Type 1 SD adaptation (1503) is applied, the base station can adapt the number of antenna ports while maintaining the number of physical antenna elements per antenna port (i.e., logical port). This

[0215] At this time, RF characteristics per port (e.g., tx power, beam) may be identical. Therefore, the terminal can perform a combined measurement of CSI-RS of the same port during CSI measurement (e.g., L1-RSRP (layer 1-RSRP), L3-RSRP (layer 3-RSRP), etc.).

[0216] In another way, when Type 2 SD adaptation (1504) is applied, the base station can have the same number of antenna ports (i.e., logical ports) and turn on / off physical antenna elements per port (1504). In this case, the RF characteristics per port may differ. During CSI measurement, the terminal can distinguish the CSI-RS of the same port and perform measurements for each. The base station can save energy through one or more of a plurality of types of SD adaptation methods, including the two types of SD adaptation methods mentioned above.

[0217] The following describes a method for configuring an On-demand SSB and SIB1 for applying an On-demand SSB and SIB for energy saving in a base station in a 5G system. In this disclosure, the term "on-demand operation" may include an On-demand SSB and an On-demand SIB (e.g., an On-demand SIB1). Furthermore, while the following embodiments focus on the On-demand SIB1, it is understood that this disclosure can also be applied to On-demand SSBs and other SIBs (On-demand SIBs). Unless otherwise specifically stated, the SIB1 request described below may be made through or by a WUS, and the said WUS may be understood as a WUS for the SIB1 request.

[0218] FIG. 16 is a drawing illustrating an example of different types of SSB designs of a base station and a terminal according to one embodiment of the present disclosure.

[0219] The base station may transmit a discovery reference signal (DRS, or Light-SSB) during the energy saving mode. The DRS may correspond to an SSB, or may further include at least one of an SIB, CSI-RS, or other reference signal included in a PDSCH scheduled by a PDCCH directed by a PBCH within the SSB. Referring to FIG. 16, the base station may transmit DRS#0 and DRS#1 with a widebeam using only a small number of antennas during the energy saving mode (1601). At this time, the base station may transmit an SSB (1603) with a smaller bandwidth (than a normal SSB) or an SSB (1603) with power boosting applied so that the DRS provides the same coverage as an SSB (1602) transmission utilizing the entire antenna. Using the above DRS, cell search and cell research of the terminal may be possible during the base station's energy saving mode (or base station's idle mode).

[0220] Subsequently, the base station's energy saving mode may be switched to the base station's normal operating mode (or the base station's active mode) through signaling of the base station or / and the terminal. At this time, the mode change from the base station's energy saving mode to the normal operating mode may be performed by the base station's implementation, or the mode may be changed via the terminal's signaling (e.g., WUS) and the base station may notify the terminal that the mode has changed via signaling (e.g., PBCH, SIB, paging message, or DCI of the DRS), or the base station may notify the terminal of the mode change via signaling (e.g., PBCH, SIB, paging message, or DCI of the DRS). The mode change from the base station's energy saving mode to the normal operating mode may be applied via the base station's signaling (e.g., PBCH, SIB, paging message, or DCI of the DRS), the base station's implementation, or the terminal's signaling (e.g., WUS). Such mode change may be applied beam-specifically to the DRS or normal SSB being transmitted by the base station.

[0221] At this time, the base station or terminal may request or instruct on-demand SSB transmission or normal SSB transmission according to the base station's energy saving mode. More specifically, the on-demand SSB (1604) and normal SSB (1605) have the same RS structure, and the same QCL assumption may be applied to SSBs that have the same RS index and other configuration information. Additionally, in the case of the on-demand SSB, transmission may be performed for a specific period or a specific number of times from the time of instruction, and then deactivated. At this time, deactivation may be performed at the point where the specific period or number of times ends, or according to the instructions of the base station.

[0222] Additionally, the base station may define a QCL relationship between the DRS and the on-demand / normal SSB for the operation of two different DRSs and on-demand / normal SSBs. The base station may map one or more SSBs with a narrow beam structure to a DRS with a wide beam structure. For example, FIG. 16 illustrates an example where SSB#0 and SSB#1 are mapped to DRS#0, and SSB#2 and SSB#3 are mapped to DRS#1. Based on the above structure, for example, a terminal may detect a cell through DRS#0 and then request an on-demand SSB (1604) or a normal SSB (1605) through the WUS for connection and paging operations with the base station. At this time, the QCL assumption is applied to DRS#0, and the WUS may request the transmission of SSB#0 and / or SSB#1 connected to DRS#0. In the above, it was assumed that the structure of the SSB for DRS and on-demand / normal SSB includes PSS, SSS, and PBCH, but is not limited thereto, and a CSI-RS structure such as TRS or a new RS structure such as PSS or PSS and SSS may be considered.

[0223] The following describes the relationships in the time, frequency, and space domains based on the synchronization raster of DRS and on-demand / normal SSB resulting from the transmission of two different types of DRS and on-demand / normal SSB by a base station. A base station may transmit DRS and on-demand / normal SSB by one or a combination of the following methods.

[0224] [Method 1]

[0225] Method 1 proposes a frequency domain relationship between SSB transmissions and a DRS / SSB transmission and reception method, considering multiple SSB types for energy saving and normal operation at a base station. More specifically, the relationship considering the synchronization raster between DRS and on-demand / normal SSB is described.

[0226] Depending on the operating mode, the base station may transmit DRS or on-demand / normal SSB. In this case, the corresponding DRS or on-demand / normal SSB may be used for the terminal's initial access and cell search operations. The base station may transmit DRS or on-demand / normal SSB in a sync raster for the terminal's initial access and cell search operations. In this case, to distinguish between DRS or on-demand / normal SSB that support different functions and are transmitted at different intervals, the base station may perform the transmission of DRS and on-demand / normal SSB in different sync rasters.

[0227] FIG. 17 is a diagram illustrating an example of a synchronization raster setting considering multiple SSB types according to one embodiment of the present disclosure.

[0228] Referring to FIG. 17, the base station may transmit DRS and on-demand / normal SSB with different information and periods depending on the base station's mode or the terminal's request. Specifically, for energy saving of the base station, the base station may operate in energy saving mode (i.e., idle mode) in Cell #1. The base station may not transmit normal SSB (N-SSB), and in the case of on-demand SSB (OD-SSB), it may not transmit if there is no demand from the base station or the terminal. At this time, the base station may transmit DRS at long intervals (e.g., 160 ms) to support terminal camping, initial connection, and cell search / research (1708).

[0229] At this time, the base station may transmit each DRS, OD-SSB, and N-SSB from different sync rasters to distinguish them. Specifically, the base station may define a hyper-synchronization raster (HGSCN) with a larger spacing in the frequency domain and transmit DRS from that raster. This may be a DRS transmission that considers the complexity of detecting the terminal's DRS during the base station's energy-saving mode and the terminal's energy saving. At this time, for a terminal checking the HGSCN to detect DRS, it may receive DRS by assuming that the transmission period in that raster is longer, such as 160 ms (compared to conventional SSB, on-demand SSB, or normal SSB). Additionally, resources such as SIB1, paging, RACH occasion, and WUS occasion may be determined according to that period (1708).

[0230] Additionally, when a base station performs normal SSB transmission during normal operation or performs on-demand SSB or normal SSB transmission in response to a request from a base station or terminal (e.g., Cell #1, 1701), it may transmit through a GSCN having a smaller frequency gap granularity (compared to an HGSCN) in the frequency domain (1703). That is, a GSCN may exist more frequently (or more often) than an HGSCN in the frequency domain; for example, if a GSCN exists at intervals of 1.44 MHz, an HGSCN may exist at intervals of 5.76 MHz. In this case, for on-demand SSB, transmission may be performed from an HGSCN for energy saving or a GSCN for normal operation depending on the configuration of the base station.

[0231] Additionally, the terminal may detect DRS or SSB by searching for one of HGSCN for energy saving or GSCN for normal operation, or a combination thereof, according to the terminal's implementation or capability or predefined rules. For example, considering a time when the user's traffic load is low, such as early morning, the terminal may determine that the base station will support energy saving operation and perform an initial cell search operation through DRS in HGSCN to receive DRS first (1706). On the other hand, considering a time when the user's traffic load is high, such as daytime, the terminal may determine that the base station will support normal operation and perform an initial cell search operation through GSCN for receiving SSB (1705).

[0232] Alternatively, the base station may transmit DRS, on-demand SSB, and normal SSB through the same sync raster (GSCN), taking into account the complexity of the terminal and energy saving. Specifically, the base station may transmit DRS on the same sync raster as OD-SSB and N-SSB during energy saving mode (e.g., idle mode) (1709, 1710). In this case, the frequency centers of the respective DRS, OD-SSB, and N-SSB may be aligned and transmitted with different periods. For example, the period of the DRS may be 160 ms, and the period of the OD-SSB / N-SSB may be 20 ms. In this case, the terminal requires a method of distinction to determine whether the detected signal is DRS, OD-SSB, or N-SSB. To this end, the base station may set and transmit the PCIs of the respective DRS, OD-SSB, and N-SSB differently from one another, or distinguish them through the PBCH transmission of the DRS, OD-SSB, and N-SSB. In this case, whether it is a DRS / OD-SSB / N-SSB may be indicated through the MIB or payload transmitted via the PBCH. Such methods may be described in more detail in the following examples.

[0233] The operation illustrated in FIG. 17 is merely an example, and the content of the present disclosure is not limited by the specific example of FIG. 17.

[0234] Through the above method 1, the frequency domain relationship between the transmitted DRS, OD-SSB, and N-SSB can be determined according to the base station mode. Through this, the terminal can distinguish each signal, determine the period of the corresponding signal, and apply reception or combining. In addition, by applying a new sync raster for each base station mode, the terminal can distinguish the base station mode and obtain additional terminal complexity improvements and energy saving effects.

[0235] [Method 2]

[0236] Method 2 proposes the relationship in the time domain between DRS, OD-SSB, and N-SSB transmitted according to the base station mode, and a DRS / SSB transmission and reception method.

[0237] A base station may transmit DRS or N-SSB for energy saving mode or normal mode, respectively. Additionally, it may transmit on-demand SSB in energy saving mode or normal mode upon request from a base station or terminal. In this case, the DRS transmission using fewer antennas for the base station's energy saving and the OD-SSB / N-SSB transmitted using more antennas in normal mode or upon request from a base station / terminal cannot overlap in the time domain, and only one signal can be transmitted according to priority. That is, the transmission using fewer antennas and the transmission using more antennas cannot overlap.

[0238] On the other hand, OD-SSB and N-SSB, having the same QCL assumption and identical information, can fully overlap in the time domain, and OD-SSB and N-SSB, having the same QCL assumption but different information, can be FDMed in the frequency domain if they fully overlap in the time domain. However, the base station can only transmit one of the two signals in the case of OD-SSB and N-SSB with different QCL assumptions, and either N-SSB or OD-SSB may be transmitted according to priority rules. Additionally, DRS / OD-SSB / N-SSB may overlap and be transmitted to terminals, limited to cases where RS is transmitted from different panels.

[0239] Through the above method 2, the base station can determine the relationship in the time domain between the DRS, OD-SSB, and N-SSB transmitted according to the mode and transmit a single signal. Through the above method, the possibility of time domain overlap is determined based on whether the same QCL assumption or the same information is included, and one of the DRS, OD-SSB, and N-SSB can be transmitted according to priority.

[0240] [Method 3]

[0241] Method 3 proposes the relationship in the spatial domain between DRS, OD-SSB, and N-SSB transmitted according to the base station mode, and a DRS / SSB transmission and reception method.

[0242] A base station may transmit DRS or N-SSB for energy saving mode or normal mode, respectively. Additionally, on-demand SSB may be transmitted in energy saving mode or normal mode upon request from a base station or terminal. In this case, DRS utilizing fewer antennas may be transmitted for the base station's energy saving, and OD-SSB / N-SSB utilizing more antennas may be transmitted in normal mode or upon request from a base station / terminal. In this case, a QCL relationship between DRS and OD-SSB / N-SSB may be established according to the upper layer signaling and L1 signaling settings of the base station. As explained through FIG. 16, the above relationship may apply a 1-to-N QCL assumption in which multiple OD-SSB / N-SSBs are mapped to a single DRS, but the present disclosure is not limited to such an example.

[0243] Through the above method 3, the base station can determine the relationship in the spatial domain between the DRS, OD-SSB, and N-SSB transmitted according to the mode and transmit a single signal.

[0244] The following provides procedures and scenarios for the operation of a base station between energy-saving mode (e.g., Idle mode) and normal mode (e.g., connected mode). According to the following embodiments, configuration information for DRS, WUS, WUS response, OD-SSB / SIB1, N-SSB, etc., and the functions included in each channel or signal are described.

[0245] FIG. 18 is a diagram illustrating an example of an energy saving operation considering a single cell of a base station and a terminal according to one embodiment of the present disclosure.

[0246] Referring to FIG. 18, the base station can consider energy saving operations for a single cell. In this case, the base station can support the initial connection, camping, paging, and cell search / research of the terminal by transmitting DRS / OD-SSB / N-SSB with different antenna assumptions and different periods. More specifically, one or more of the three representative scenarios below may be applied depending on the configuration of the base station.

[0247] [Scenario 0]

[0248] Scenario 0 (1801) describes operations considering that DRS, WUS, response to WUS, and OD-SSB are transmitted and received during the base station's energy saving mode.

[0249] The base station can distinguish between an energy saving mode for energy saving, i.e., an Idle BS operation (1802), and a normal mode for data transmission, i.e., a connected BS operation (1803). During the idle BS operation mode (1802) for energy saving of the base station, the base station can transmit a DRS to the terminal for cell search / research and camping of the terminal (1804). At this time, the DRS may include at least one of information for distinguishing from OD-SSB / N-SSB, DRS configuration information, configuration information for transmitting the terminal's WUS, configuration information for receiving the base station's response to the UL WUS, and basic cell information. Specifically, at least one of the following information may be included in the DRB (DRS block), and the present disclosure is not limited by such an example. The above DRB may also include at least one of an SIB, CSI-RS, or other reference signal included in a PDSCH scheduled by a PDCCH directed by an SSB (or synchronization signal and broadcast channel) or a PBCH (or broadcast channel) within the SSB.

[0250] Information of DRB:

[0251] - SSB-Type: Configuration information for distinguishing DRS, OD-SSB, and N-SSB. Depending on this information, the interpretation of internal information for DRS / OD-SSB / N-SSB may change.

[0252] - SSB-periodicity: Transmission period of DRS / OD-SSB / N-SSB

[0253] - SSBTransNumber: Number of OD-SSB transmissions to date when SSB-Type is set to OD-SSB

[0254] - RSRP-Threshold: RSRP condition for determining the accessibility of the cell

[0255] - WUS-Config: WUS configuration information for requesting OD-SSB / N-SSB transmission upon receiving DRS

[0256] - SystemFrameNumber

[0257] - SubCarrierSpacingCommon: Subcarrier spacing setting information for receiving SIB0, OD-SIB1, and the response to WUS (hereinafter interchangeably referred to as WUS response).

[0258] - ssb-SubCarrierOffset: Offset for aligning the grid of the SSB's subcarrier level.

[0259] - pdcch-Config: CORESET configuration information for receiving SIB0, OD-SIB1, WUS response, etc.

[0260] - WUS-response-window: A window through which the terminal monitors the WUS response after transmitting a WUS; for example, it may be configuration information regarding the window size.

[0261] - cellBarred: Whether camp on is possible for the cell

[0262] - dmrs-TypeA-Position: Information about the location of the first DMRS for the data channel

[0263] - Paging settings

[0264] The configuration information in the above example can be included in the DRB of the DRS and transmitted. In this case, since WUS-config requires more configuration information for WUS transmission, Lookup tables containing the following information are pre-configured, and the terminal can transmit WUS by referring to the configuration information of the Lookup table indicated by WUS-Config. Table 10 below is an example of a lookup table for WUS configuration.

[0265] PurposeParametersWUS transmissionAct-RequestConfig DRS-DSB-BlockPowerDRS-positionInBursttdd-UL-DL-ConfigurationCommonrach-OccasionsSIB1Prach-ConfigurationIndexmsg1-FDMmsg1-FrequencyStartzeroCorrelationZoneConfigpreambleReceivedT argetPowerpreambleTransMaxpowerRampingStepra-ResponseWindowprach-RootSequenceIndexDRS-perRACH-Occasionsib1-RequestPeriodfrequencyInfoULp-MaxabsoluteFrequencyPointAoffsetToCarrier

[0266] Similar to the method of using a pre-configured lookup table to reduce the payload size during the above WUS configuration, a lookup table can be applied to reduce the payload of all other configuration information.

[0267] After receiving the DRS, the terminal may transmit a UE request via the UL WUS to request an OD-SSB / OD-RS or an OD-SIB or an N-SSB (1805). At this time, the base station sets the type of preamble and the WUS occasion for transmitting the preamble to the terminal to support requests for different purposes for UL WUS transmission, and the terminal may request one or more OD-SSB, OD-RS, OD-SIB, and N-SSB according to the settings. Subsequently, the terminal may receive a DCI or PDSCH (RA response or SIB0) or a DCI and a PDSCH as a response to the WUS (1806). The response signal of the WUS may include one of the following setting information or a combination thereof depending on the function requested by the terminal, and the present disclosure is not limited by such an example.

[0268] Information of response to WUS:

[0269] - OD-RS configuration, e.g., OD-SSB: Configuration information for receiving OD-RS or OD-SSB

[0270] ■ OD-RS-Type: The RS type of OD-RS, e.g., CSI-RS or SSB

[0271] ■ OD-RS-resourceconfig: Time / frequency resource configuration information for OD-RS or OD-SSB reception, for example, the bandwidth of the OD-RS or OD-SSB, the number of active indices (OD-ssb-positionInburst), and the starting time and offset.

[0272] ■ OD-RS-TransPower: OD-RS or OD-SSB transmission power

[0273] ■ Number of Transmissions: OD-RS or OD-SSB transmission count

[0274] ■ Duration of Transmission: The period during which OD-RS or OD-SSB transmission is active

[0275] ■ OD-RS-QCL: QCL relationship between OD-RS or OD-SSB and DRS

[0276] ■ OD-RS-periodicity: OD-RS or OD-SSB transmission period

[0277] - OD-SIB configuration, e.g., SIB0, OD-SIB1, OD-SIBX: time / frequency setting information for receiving SIBs. More specifically, different resource settings are required because the payload size varies depending on the SIB type, such as SIB0, OD-SIB1, and OD-SIBX.

[0278] - Paging configuration:

[0279] - N-SSB configuration:

[0280] ■ N-SSB-resourceconfig: Time / frequency resource configuration information for N-SSB reception, such as the N-SSB bandwidth, the number of active indices (ssb-positionInburst), and the starting time and offset.

[0281] ■ N-SSB-TransPower: N-SSB Transmission Power

[0282] ■ N-SSB-QCL: QCL assumption between DRS and N-SSB

[0283] ■ N-SSB-periodicity: N-SSB transmission period

[0284] - RACH configuration for initial access: Configuration for RACH occasions for initial access based on OD-SSB or N-SSB. Through this configuration, whether to replace additional RACH with WUS can be configured.

[0285] - Cell DTX / DRX configuration: Cell DTX / DRX configuration information

[0286] - CSI-report configuration: Configuration information for DRS, OD-SSB, or N-SSB-based CSI reports

[0287] Subsequently, based on the above configuration information, the terminal may receive paging, OD-RS or OD-SIB (1807), or N-SSB according to the normal operation of the base station (1808). Additionally, in the case of OD-SSB and N-SSB, SIB1 and CORESET configuration information for normal operation and / or configuration information indicating the type of SSB may be included. At this time, the bit mapping position of the configuration information indicating the type of SSB may be the same for DRS, OD-SSB, and N-SSB. Therefore, the type of SSB can be quickly distinguished. At this time, the OD-SSB may be a QCL signal assuming the same antenna configuration as DRS, or an OD-SSB assuming a specific antenna configuration (e.g., assuming a maximum number of antennas) like N-SSB. This may be selected and transmitted by the base station or the terminal.

[0288] Through the operation of the above scenario 0, the base station can maximize energy saving effects and idle BS operation utilizing OD-SSB / SIB, and the terminal can obtain delay gain by requesting signals or channels as needed, and the terminal can obtain energy saving effects by managing unnecessary WUS transmissions according to the WUS response.

[0289] [Scenario 1]

[0290] Scenario 1 (1811) describes operations considering that DRS, WUS, and response to WUS are transmitted and received during the base station's energy saving mode.

[0291] The base station can distinguish between an energy saving mode for energy saving, i.e., Idle BS operation (1812), and a normal mode for data transmission, i.e., connected BS operation (1813). During the idle BS operation mode (1812) for energy saving of the base station, the base station can transmit a DRS to the terminal for cell search / research and camping (1814). At this time, the DRS may include information for distinguishing from N-SSB, configuration information for transmitting the terminal's WUS, and basic cell information. At least one of the following information may be included in the DRS, and the content of the present disclosure is not limited by such examples.

[0292] Information of DRB:

[0293] - SSB-Type: Configuration information for distinguishing between DRS and N-SSB. The interpretation of internal information for each DRS / N-SSB may change depending on this information.

[0294] - SSB-periodicity: Transmission period of DRS / N-SSB

[0295] - RSRP-Threshold: RSRP condition to determine the connectivity of the cell

[0296] - WUS-Config: WUS configuration information for requesting N-SSB transmission upon receiving DRS

[0297] - SystemFrameNumber

[0298] - SubCarrierSpacingCommon: Subcarrier configuration information for receiving SIB0, WUS response, etc.

[0299] - ssb-SubCarrierOffset: Offset for aligning the grid of the SSB's subcarrier level.

[0300] - pdcch-Config: CORESET configuration information for receiving SIB0, WUS response, etc.

[0301] - WUS-response-window: A window where the terminal monitors the WUS response after transmitting a WUS.

[0302] - cellBarred: Whether camp on is possible for the cell

[0303] - dmrs-TypeA-Position

[0304] - Paging settings

[0305] The configuration information in the above example can be included in the DRB of the DRS and transmitted. In this case, since WUS-config requires more configuration information for WUS transmission, lookup tables containing the following information are pre-configured, and the terminal can transmit WUS by referring to the configuration information in the lookup table indicated by WUS-Config. Table 11 is an example of a lookup table for WUS configuration.

[0306] PurposeParametersWUS transmissionAct-RequestConfig DRS-DSB-BlockPowerDRS-positionInBursttdd-UL-DL-ConfigurationCommonrach-OccasionsSIB1Prach-ConfigurationIndexmsg1-FDMmsg1-FrequencyStartzeroCorrelationZoneConfigpreambleReceivedT argetPowerpreambleTransMaxpowerRampingStepra-ResponseWindowprach-RootSequenceIndexDRS-perRACH-Occasionsib1-RequestPeriodfrequencyInfoULp-MaxabsoluteFrequencyPointAoffsetToCarrier

[0307] Just as a pre-configured lookup table is used to reduce the payload size when configuring the WUS as described above, a lookup table may be applied to reduce the payload size of all other configuration information. After receiving the DRS, the terminal may transmit a UE request through the UL WUS to request an N-SSB (1815). At this time, the base station may configure the type of preamble and the WUS occasion for transmitting the preamble to support requests for different purposes for the terminal's UL WUS transmission, and the terminal may request one or more N-SSBs according to the configuration. Subsequently, the terminal may receive a DCI or PDSCH (RA response or SIB0) or a DCI and a PDSCH as a response to the WUS (1816). The response signal of the WUS may include one of the following configuration information or a combination thereof depending on the function requested by the terminal, and the present disclosure is not limited by such an example.

[0308] Information of response to WUS:

[0309] - Paging configuration:

[0310] - N-SSB configuration:

[0311] ■ N-SSB-resourceconfig: Time / frequency resource configuration information for N-SSB reception, such as bandwidth, the index number at which N-SSB is activated (ssb-positionInburst), and the starting time and offset.

[0312] ■ N-SSB-TransPower: N-SSB Transmission Power

[0313] ■ N-SSB-QCL: QCL assumption between DRS and N-SSB

[0314] ■ N-SSB-periodicity: N-SSB transmission period

[0315] - RACH configuration for initial access: Configuration for the RACH occasion for initial access based on N-SSB. Through this configuration, it is possible to configure whether to replace additional RACH with WUS.

[0316] - Cell DTX / DRX configuration: Cell DTX / DRX configuration information

[0317] - CSI-report configuration: Configuration information for DRS or N-SSB-based CSI reports

[0318] Subsequently, based on the above configuration information, the terminal can receive paging and N-SSB according to the normal operation of the base station (1817). In addition, the N-SSB may include SIB1 and CORESET configuration information for normal operation and / or configuration information indicating the type of SSB. At this time, the bit mapping position of the configuration information indicating the type of SSB may be the same in both the DRS and the N-SSB PBCH. Through the operation of the above scenario 1, the base station can obtain a greater energy saving effect, and the terminal can obtain a delay gain by requesting a signal or channel as needed, and the terminal can obtain an energy saving effect by managing unnecessary WUS transmission according to the WUS response.

[0319] [Scenario 2]

[0320] Scenario 2 (1821) describes operations considering that DRS and WUS are transmitted and received during the base station's energy saving mode. The base station can distinguish between an energy saving mode for energy saving, i.e., Idle BS operation (1822), and a normal mode for data transmission, i.e., connected BS operation (1823). During the base station's energy saving idle BS operation mode (1812), the base station can transmit DRS to the terminal for cell search / research and camping (1824). At this time, the DRS may include information for distinguishing from N-SSB, configuration information for transmitting the terminal's WUS, and basic cell information. At least one of the following information may be included in the DRS, and the content of the present disclosure is not limited by such examples.

[0321] Information of DRB:

[0322] - SSB-Type: Configuration information for distinguishing between DRS and N-SSB. The interpretation of internal information for each DRS / N-SSB may change depending on this information.

[0323] - SSB-periodicity: Transmission period of DRS / N-SSB

[0324] - RSRP-Threshold: RSRP condition for determining the accessibility of the cell

[0325] - WUS-Config: WUS configuration information for requesting N-SSB transmission upon receiving DRS

[0326] - SystemFrameNumber

[0327] - SubCarrierSpacingCommon: Subcarrier spacing setting information for receiving SIB0, WUS response, etc.

[0328] - ssb-SubCarrierOffset: Offset for aligning the grid of the SSB's subcarrier level.

[0329] - pdcch-Config: CORESET configuration information for receiving SIB0

[0330] - WUS-response-window: A window where the terminal monitors the WUS response after transmitting a WUS.

[0331] - cellBarred: Whether camp on is possible for the cell

[0332] - dmrs-TypeA-Position

[0333] - Paging settings

[0334] The configuration information in the above example can be included in the DRB of the DRS and transmitted. In this case, since WUS-config requires more configuration information for WUS transmission, Lookup tables containing the following information are pre-configured, and the terminal can transmit WUS by referring to the configuration information of the Lookup table indicated by WUS-Config. Table 12 is an example of a lookup table for WUS configuration.

[0335] PurposeParametersWUS transmissionAct-RequestConfig DRS-DSB-BlockPowerDRS-positionInBursttdd-UL-DL-ConfigurationCommonrach-OccasionsSIB1Prach-ConfigurationIndexmsg1-FDMmsg1-FrequencyStartzeroCorrelationZoneConfigpreambleReceivedT argetPowerpreambleTransMaxpowerRampingStepra-ResponseWindowprach-RootSequenceIndexDRS-perRACH-Occasionsib1-RequestPeriodfrequencyInfoULp-MaxabsoluteFrequencyPointAoffsetToCarrier

[0336] Just as a pre-configured lookup table is used to reduce the payload size when configuring the WUS above, a lookup table may be applied to reduce the payload of all other configuration information. After receiving the DRS above, the terminal may transmit a UE request through the UL WUS to request an N-SSB (1825). At this time, the base station may configure the type of preamble and the WUS occasion for transmitting the preamble to support requests for different purposes for the terminal's UL WUS transmission, and the terminal may request one or more N-SSBs according to the above configuration.

[0337] Subsequently, based on the above configuration information, the terminal can receive paging or N-SSB according to the normal operation of the base station (1826). In addition, in the case of N-SSB, it may include SIB1 and CORESET configuration information for normal operation and / or configuration information indicating the type of SSB. At this time, the bit mapping position of the configuration information indicating the type of SSB may be the same in both the DRS and the N-SSB PBCH. Through the operation of the above scenario 2, the base station can obtain a greater energy saving effect, and the terminal can obtain delay gain by requesting a signal or channel as needed.

[0338] The operation illustrated in FIG. 18 is merely an example, and the content of the present disclosure is not limited by the specific example of FIG. 18.

[0339] In the following, a timeline of the normal mode operation of a base station is described, taking into account a response signal to UL WUS transmission (e.g., UL WUS response) and a transition to an on-demand channel / signal or normal mode during the energy saving operation of the base station according to an embodiment of the present disclosure.

[0340] FIG. 19 is a diagram illustrating an example of a timeline of a UL WUS response during an energy saving operation of a base station according to one embodiment of the present disclosure.

[0341] Referring to FIG. 19, the base station may transmit four light SSBs based on long periods for energy saving. At this time, the base station may set resources for WUS transmission to the terminal and set UL WUS response occasions to receive a response for the corresponding WUS. Additionally, the base station may set resources for the base station to transmit on-demand channels and signals to the terminal, and / or according to the terminal's request, for transmitting on-demand channels and signals. More specifically, in the case of on-demand channel / signal transmission and normal operation change, the base station may perform on-demand channel / signal transmission and normal operation change after directly instructing the terminal that on-demand channel / signal transmission and normal operation change are to be performed. Additionally, the base station may request on-demand channel / signal transmission and normal operation change from an adjacent base station via a backhaul signal.

[0342] More specifically, based on the above configuration information, the terminal may transmit a WUS (1901, 1903) in slot #4 of subframe #N to request an on-demand channel and signal or a base station's normal mode transmission. At this time, before transmitting the WUS to the base station, the terminal may determine whether to transmit the WUS after checking whether an on-demand channel / signal is being transmitted based on the configuration information received from the base station. The terminal may monitor UL WUS responses during a WUS response window configured by the base station to receive a response to the WUS from the base station. At this time, the starting point of the WUS response window may be based on the nearest WUS response occasion after the WUS transmission (1902). Alternatively, the starting point of the WUS response window may start from the last point in time of the slot where the WUS transmission ended (1904). The terminal may monitor UL WUS responses configured by the base station during the corresponding WUS response window.

[0343] In addition, for on-demand channels / signals requested by the terminal, the terminal can continuously buffer and monitor the on-demand channels / signals based on the time of transmitting the WUS, the time of receiving the WUS response, or the start / end time of the WUS response window.

[0344] The operation illustrated in FIG. 19 is merely an example, and the content of the present disclosure is not limited by the specific example of FIG. 19.

[0345] FIG. 20 is a drawing illustrating another example of a timeline for receiving an on-demand channel and a signal during an energy saving operation of a base station according to one embodiment of the present disclosure.

[0346] Referring to FIG. 20, the base station may transmit four light SSBs based on long periods for energy saving. At this time, the base station may set resources for WUS transmission to the terminal and set UL WUS response occasions to receive a response for the corresponding WUS. Additionally, the base station may set resources for the base station to transmit on-demand channels and signals to the terminal and / or, upon the terminal's request, to transmit on-demand channels and signals. More specifically, in the case of on-demand channel / signal transmission and normal operation change, the base station may perform on-demand channel / signal transmission and normal operation change after directly instructing the terminal that on-demand channel / signal transmission and normal operation change are to be performed. Additionally, the base station may request on-demand channel / signal transmission and normal operation change from an adjacent base station via a backhaul signal.

[0347] More specifically, based on the above configuration information, the terminal may transmit WUS (2001, 2004, 2007, 2010, 2014) in slot #4 of subframe #N to request an on-demand channel and signal or a normal mode transmission from the base station. Subsequently, the terminal may receive a WUS response from the base station in slot #11 (2002, 2005, 2008, 2011, 2015). Subsequently, the terminal may monitor the on-demand channel and signal during a configured monitoring window via upper layer signaling or / and L1 signaling (e.g., the WUS response) from the base station. At this time, the monitoring window may be applied according to the configuration via the base station's upper layer signaling and L1 signaling or the terminal's capability according to one or a combination of the following methods.

[0348] [Method 1]

[0349] In Method 1, the starting point of the monitoring window can be determined based on the time of WUS transmission. Referring to FIG. 20, the terminal determines the time after WUS transmission as the starting point of the monitoring window and can monitor the on-demand channel and signal during the monitoring window period (2003).

[0350] [Method 2]

[0351] In Method 2, the starting point of the monitoring window can be determined based on the time of receiving the WUS response. Referring to FIG. 20, the terminal determines the time after receiving the WUS response as the starting point of the monitoring window and can monitor the on-demand channel and signal during the monitoring window period (2006).

[0352] [Method 3]

[0353] In Method 3, the starting point of the monitoring window can be determined based on the monitoring occasion of the nearest on-demand channel / signal after receiving the WUS response. Referring to FIG. 20, the terminal can determine the starting point of the monitoring window based on the monitoring occasion of the nearest on-demand channel / signal after receiving the WUS response and monitor the on-demand channel and signal during the monitoring window period (2009).

[0354] [Method 4]

[0355] In Method 4, the starting point of the monitoring window may be determined based on a specific time offset after receiving the WUS response or based on the nearest on-demand channel / signal monitoring occasion. Referring to FIG. 20, the terminal may determine the starting point of the monitoring window based on the monitoring occasion of the on-demand channel / signal after a specific time offset (2013) after receiving the WUS response, and monitor the on-demand channel and signal during the monitoring window period (2012). At this time, the time offset may be set from the base station via the DRB, SIB, or WUS response, or determined by the terminal's UE capability. The time offset may be a value that takes into account the processing time required to receive and decode the WUS response.

[0356] [Method 5]

[0357] In Method 5, the starting point of the monitoring window may be determined based on a specific time offset after the WUS response window or the nearest on-demand channel / signal monitoring occasion. Referring to FIG. 20, the terminal may determine the starting point of the monitoring window based on the monitoring occasion of the on-demand channel / signal after a specific time offset (2018) following the time when the WUS response window (2016) ends, and monitor the on-demand channel and signal during the monitoring window period (2017). At this time, the time offset may be set from the base station via a DRB, SIB, or WUS response, or determined by the terminal's UE capability. The time offset may be a value that takes into account the processing time required to receive and decode the WUS response. The terminal may receive the WUS response within the WUS response window to start the monitoring window.

[0358] Through the above methods, the terminal can monitor and receive on-demand channels or signals according to the base station's settings. In this case, when the terminal requests an on-demand channel (e.g., SIBX) and an on-demand signal (e.g., SSB or CSI-RS) separately or together through one or multiple WUSs, windows of different methods or different setting values ​​may be applied. Additionally, the terminal may consider only the occasion for the requested channel and signal as the valid occasion for the on-demand channel or signal. Alternatively, the terminal may consider all candidate occasions configured by the base station, rather than the requested channel and signal. For example, when the base station has configured eight on-demand SSBs as SSBs capable of on-demand requests, if the terminal requests only two specific SSBs on-demand, only the occasion of the SSBs requested on-demand may be considered validly, or the occasions of all SSBs configured by the base station may be considered validly and monitored. If only the requested signal is determined and used as a valid occasion, more optimized energy saving effects for the base station or terminal can be achieved. On the other hand, if the entire configured resource is determined and operated as a valid occasion, more reliable operation can be supported.

[0359] The operation illustrated in FIG. 20 is merely an example, and the content of the present disclosure is not limited by the specific example of FIG. 20.

[0360] FIG. 21 is a diagram illustrating an example of the operation of a terminal applying an energy-saving method of a wireless communication system according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of FIG. 21. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0361] Based on Fig. 21, the operation of a terminal during base station energy saving operation considering multiple SSB types for energy saving is described.

[0362] Referring to FIG. 21, in step 2101, the terminal may detect an SSB through an HGSCN or GSCN for initial cell search from a base station. The method for verifying the HGSCN or GSCN may be referred to above. In step 2102, the terminal may receive SSB configuration information through the PBCH or PCI of the detected SSB and / or determine the type of the SSB. The type of the SSB may be, for example, a DRS, OD-SSB, or N-SSB. In step 2103, the terminal may receive and obtain at least one of UL WUS configuration information or paging information through the PBCH of the detected SSB. Steps 2102 and 2103 may also be performed simultaneously. Additionally, the information in steps 2102 and 2103 may be included in the DRS block as well as the SSB.

[0363] In step 2104, the terminal may transmit an UL WUS for on-demand channel / signal or Normal SSB transmission based on the configuration information. In step 2105, after transmitting the UL WUS, the terminal may perform WUR (WUS response) monitoring in a configured WUS response resource (or WUS response window). Additionally, the terminal may perform on-demand channel / signal monitoring in the WUS response resource. The WUR may include the information of response to WUS described above. Alternatively, on-demand channel / signal monitoring may be performed in a monitoring window for the on-demand channel / signal. The WUS response resource and / or the monitoring window for the on-demand channel / signal may be configured in the manner described above. In step 2106, the terminal may receive the activated on-demand channel / signal or Normal SSB transmitted in the normal mode of the base station.

[0364] Specific details of the terminal operation according to one embodiment of the present disclosure described above may be referenced to the description of one embodiment of the present disclosure described above.

[0365] FIG. 22 is a flowchart of the operation of a base station applying an energy-saving method of a wireless communication system according to one embodiment of the present disclosure. Various modifications may be made to the method illustrated in the flowchart of FIG. 22. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0366] Referring to FIG. 22, in step 2201, the base station may transmit an SSB through an HGSCN or GSCN for initial cell search depending on the base station mode. The method for configuring the HGSCN or GSCN may be referred to above. At this time, the base station may transmit SSB configuration information or / and SSB type information to the terminal through the PBCH or PCI of the SSB. The type of the SSB may be, for example, DRS, OD-SSB, or N-SSB. In addition, at this time, the base station may transmit at least one of UL WUS configuration information or paging information through the PBCH of the transmitted SSB.

[0367] In step 2202, the base station may monitor the UL WUS transmission of a terminal to request an on-demand channel / signal or Normal SSB transmission according to the configuration information. The terminal may perform a WUS transmission according to the information configured by the base station. In step 2203, the base station may perform a WUR transmission in a configured WUS response resource (or WUS response window) after receiving the UL WUS. Additionally, the base station may transmit the on-demand channel / signal from the WUS response resource. The WUR may include the information of response to WUS described above. Alternatively, on-demand channel / signal monitoring may be transmitted in a monitoring window for the on-demand channel / signal. The WUS response resource or / and the monitoring window for the on-demand channel / signal may be configured in the manner described above. In step 2204, the base station may transmit the activated on-demand channel / signal or a Normal SSB transmitted in the base station's normal mode.

[0368] Specific details of the base station operation according to one embodiment of the present disclosure described above may be referenced to the description of one embodiment of the present disclosure described above.

[0369] The above-described flowchart illustrates an exemplary method that may be implemented in accordance with the principles of the present disclosure, and various modifications may be made to the method illustrated in the flowchart in this specification. For example, although illustrated as a series of steps, the various steps in each figure may overlap, occur in parallel, occur in a different order, or occur multiple times. In other examples, steps may be omitted or replaced with other steps.

[0370] According to various embodiments of the present disclosure, a base station in a communication system may perform different types of SSB transmission to reduce energy consumption. The base station may transmit a light SSB (or DRS) by utilizing a long period and fewer antennas during an energy-saving mode. Subsequently, based on the signaling of the base station or terminal, it may transmit a heavy (or normal) SSB in a normal mode.

[0371] According to various embodiments of the present disclosure, a terminal can receive different SSBs and determine the type of the SSB (i.e., the mode of the base station) based on information obtained through the SSBs. Subsequently, the terminal can request a normal SSB and SIB1 to connect to or camp at a base station.

[0372] According to various embodiments of the present disclosure, a base station may configure the WUS configuration information and the corresponding SSB configuration information for a terminal request by including them in the response / DCI / SIB, etc., for the PBCH / WUS transmission of the SSB or DRS.

[0373] According to various embodiments of the present disclosure, a timeline is defined for an on-demand operation request by a terminal to a base station via WUS transmission, a WUS response transmission after receiving a WUS signal for the terminal's on-demand request, and an on-demand channel or signal transmission.

[0374] FIG. 23 is a block diagram of a terminal according to one embodiment of the present disclosure. Referring to FIG. 23, the terminal (2300) may include a transceiver (2301), a control unit (e.g., a processor) (2302), and a storage unit (e.g., a memory, 2303). The transceiver (2301), the control unit (2302), and the storage unit (2303) of the terminal (2300) may operate according to at least one or a combination thereof of the methods corresponding to the above-described embodiments. However, the components of the terminal (2300) are not limited to the illustrated examples. According to other embodiments, the terminal (2300) may include more components or fewer components than the above-described components. In addition, in certain cases, the transceiver (2301), the control unit (2302), and the storage unit (2303) may be implemented in the form of a single chip.

[0375] According to one embodiment, the transceiver (2301) may be composed of a transmitter and a receiver. The transceiver (2301) may transmit and receive signals with a base station. The signals may include control information and data. The transceiver (2301) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. The transceiver (2301) may receive a signal through a wireless channel and output it to a control unit (2302), and transmit the signal output from the control unit (2302) through a wireless channel.

[0376] The control unit (2302) can control a series of procedures that allow the terminal (2300) to operate according to the embodiments of the present disclosure described above. For example, the control unit (2302) can perform or control the operation of the terminal to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. The control unit (2302) may include at least one processor. For example, the control unit (2302) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0377] The storage unit (2303) can store control information (e.g., information related to channel estimation using DMRSs transmitted from a PUSCH included in a signal obtained from a terminal (2300)) or data, and may have an area for storing data required for control of the control unit (2302) and data generated during control by the control unit (2302).

[0378] FIG. 24 is a block diagram of a base station according to one embodiment. Referring to FIG. 24, the base station (2400) may include a transceiver (2401), a control unit (e.g., a processor) (2402), and a storage unit (e.g., a memory) (2403). The transceiver (2401), control unit (2402), and storage unit (2403) of the base station (2400) may operate according to at least one or a combination thereof of the methods corresponding to the above-described embodiments. However, the components of the base station (2400) are not limited to the illustrated examples. According to other embodiments, the base station (2400) may include more components or fewer components than the above-described components. In addition, in certain cases, the transceiver (2401), control unit (2402), and storage unit (2403) may be implemented in the form of a single chip.

[0379] According to one embodiment, the transceiver (2401) may be composed of a transmitter and a receiver. The transceiver (2401) may transmit and receive signals with a terminal. The signals may include control information and data. The transceiver (2401) may be configured to include an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. The transceiver (2401) may receive a signal through a wireless channel and output it to a control unit (2402), and transmit the signal output from the control unit (2402) through a wireless channel.

[0380] The control unit (2402) can control a series of procedures to enable the base station (2400) to operate according to the embodiments of the present disclosure described above. For example, the control unit (2402) can perform or control the operation of the base station to perform at least one of the methods according to the embodiments of the present disclosure or a combination thereof. The control unit (2402) may include at least one processor. For example, the control unit (2402) may include a communication processor (CP) that performs control for communication and an application processor (AP) that controls an upper layer (e.g., an application).

[0381] The storage unit (2403) can store control information (e.g., information related to channel estimation generated using DMRSs transmitted in a PUSCH determined by the base station (2400)), data, control information received from a terminal, or data, and may have an area for storing data required for control of the control unit (2402) and data generated during control by the control unit (2402).

[0382] The drawings illustrate different examples of user devices / base stations, but various modifications to the drawings may be made. For example, a user device / base station may include any number of individual components in any suitable arrangement. In general, the drawings do not limit the scope of the disclosure to any specific configuration. Furthermore, while the drawings illustrate operating environments in which various user device / base station features disclosed in this patent document may be used, these features may be used in any other suitable system.

[0383] Although the present disclosure has been described by exemplary embodiments, various changes and modifications may be presented to those skilled in the art. The present disclosure is intended to include such changes and modifications that fall within the scope of the appended claims. The description in this application should not be interpreted as implying that any specific element, step, or function is an essential element to be included in the claims. The scope of the patented subject matter is defined by the claims.

Claims

1. In a method performed by a terminal of a communication system, A step of receiving a discovery reference signal (DRS) from a base station, wherein the DRS further comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) directed by the PBCH, and wherein the DRS includes wake-up signal (WUS) setting information; and Based on the above WUS configuration information, the method includes the step of transmitting a WUS requesting the transmission of an OD-SSB (on-demand SSB) or a normal SSB (normal SSB) to the base station. A method characterized by the above WUS configuration information including a plurality of pre-configured information.

2. In Paragraph 1, A step of receiving the general SSB from the base station; and A method characterized by further including the step of transmitting a PRACH (physical random access channel) preamble to the base station based on a SIB (system information block) corresponding to the above general SSB.

3. In Paragraph 1, The method further includes the step of receiving a response message for the WUS from the base station, A method characterized in that the above response message includes setting information for the general SSB or setting information for the OD-SSB.

4. In Paragraph 3, A method characterized in that the location of the window in the time domain for receiving the above response message is based on the slot in which the WUS was transmitted or on the occasion for receiving the nearest response message after the transmission of the WUS.

5. In the method performed by a base station of a communication system, A step of transmitting a DRS (discovery reference signal) to a terminal, wherein the DRS further comprises an SSB (synchronization signal block) including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel), and a PDSCH (physical downlink shared channel) scheduled by a PDCCH (physical downlink control channel) directed by the PBCH, and wherein the DRS includes WUS (wake-up signal) setting information; and The step of receiving a WUS corresponding to the WUS configuration information from the terminal, wherein the WUS requests the transmission of an OD-SSB (on-demand SSB) or a normal SSB (normal SSB), and A method characterized by the above WUS configuration information including a plurality of pre-configured information.

6. In Paragraph 5, A step of transmitting the general SSB to the above terminal; and A method characterized by the step of receiving a PRACH (physical random access channel) preamble from the terminal, wherein the PRACH preamble is based on a SIB (system information block) corresponding to the general SSB.

7. In Paragraph 5, The method further includes the step of transmitting a response message for the WUS to the terminal, A method characterized in that the above response message includes setting information for the general SSB or setting information for the OD-SSB.

8. In Paragraph 7, A method characterized in that the location in the time domain for transmitting the above response message is based on the slot in which the WUS is received or on the occasion for receiving the nearest response message after the reception of the WUS.

9. In a terminal of a communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the terminal: A discovery reference signal (DRS) is received from a base station, and the DRS further comprises a synchronization signal block (SSB) including a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH), and a physical downlink shared channel (PDSCH) scheduled by a physical downlink control channel (PDCCH) directed by the PBCH, and the DRS includes wake-up signal (WUS) setting information. It includes a memory that stores a command to transmit a WUS requesting the transmission of an OD-SSB (on-demand SSB) or a normal SSB (normal SSB) to the base station based on the above WUS configuration information, A terminal characterized by the above WUS configuration information including a plurality of pre-configured information.

10. In paragraph 9, the above command is that the terminal: Receive the general SSB from the above base station, and A terminal characterized by further transmitting a PRACH (physical random access channel) preamble to the base station based on a SIB (system information block) corresponding to the above general SSB.

11. In paragraph 9, the above command causes the terminal to further receive a response message for the WUS from the base station, and A terminal characterized in that the above response message includes configuration information for the general SSB or configuration information for the OD-SSB.

12. In Paragraph 11, A terminal characterized in that the location in the time domain of the window for receiving the above response message is based on the slot in which the WUS was transmitted or on the occasion for receiving the nearest response message after the transmission of the WUS.

13. In a method performed by a base station of a communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and Connected to communicate with at least one processor and capable of executing individually or in any combination of the at least one processor, the base station: Transmitting a DRS (discovery reference signal) to a terminal, wherein the DRS further comprises an SSB (synchronization signal block) including a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (physical broadcast channel), and a PDSCH (physical downlink shared channel) scheduled by a PDCCH (physical downlink control channel) directed by the PBCH, and wherein the DRS includes WUS (wake-up signal) setting information, and A memory storing a command to receive a WUS corresponding to the WUS configuration information from the terminal; The above WUS requests the transmission of an OD-SSB (on-demand SSB) or a normal SSB, and A base station characterized by the above WUS configuration information including a plurality of pre-configured information.

14. In Paragraph 13, the above command is that the base station: Transmit the above general SSB to the above terminal, and Further receive a PRACH (physical random access channel) preamble from the above terminal, and A base station characterized by the above-mentioned PRACH preamble being based on a SIB (system information block) corresponding to the above-mentioned general SSB.

15. In paragraph 13, the above command causes the base station to further transmit a response message to the WUS to the terminal, and A base station characterized by the above response message including configuration information for the general SSB or configuration information for the OD-SSB.

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