Method and device for transmitting and receiving signals in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting higher data transmission rates. A method of a terminal in a wireless communication system, according to one embodiment of the present disclosure, may comprise the operations of: receiving a discovery signal from a base station; identifying that the base station exists in the vicinity of the terminal on the basis of the discovery signal, and transmitting, to the base station, a terminal request signal for requesting synchronization signal transmission; and receiving, from the base station, an on-demand synchronization signal block (SSB) that corresponds to the terminal request signal and is composed of a combination of at least some of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] The present disclosure relates to a communication method of a wireless communication system, and more specifically to a method and apparatus for defining efficient frequency usage and transmission and reception operations of a terminal.

[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 known as millimeter wave (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, measures are being considered to achieve even faster transmission speeds and even lower ultra-low latency 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 included beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands; support for various numerologies (such as operating 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; the 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] In addition, discussions are underway to improve and enhance the performance of the initial 5G mobile communication technology in consideration of the services that the 5G mobile communication technology was intended to support. Standardization has been carried out 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 was also carried out for technologies such as the Industrial Internet of Things (IIoT) to support new services through linkage and convergence with other industries, Integrated Access and Backhaul (IAB) which provides nodes to expand 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 RACH for NR which simplifies random access procedures.

[0006] In addition, standardization is underway for 5G baseline architectures (e.g., Service based Architecture, Service based Interface) for the integration of Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, as well as for Mobile Edge Computing (MEC), which provides services based on the location of the terminal.

[0007] With the commercialization of such 5G mobile communication systems, 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).

[0008] In addition, the advancement of these 5G mobile communication systems can serve as a foundation for the development of new waveforms for ensuring coverage of 6G mobile communication technology, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas, and large-scale antennas, metamaterial-based lenses and antennas, high-dimensional spatial multiplexing technology using Orbital Angular Momentum (OAM), and Reconfigurable Intelligent Surface (RIS) technology, as well as Full Duplex technology for improving frequency efficiency and system networks of 6G mobile communication technology, AI-based communication technology that realizes system optimization by utilizing satellites and AI from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology that realizes services of complexity exceeding the limits of terminal computing capabilities by utilizing ultra-high-performance communication and computing resources.

[0009] The disclosed embodiments aim to provide an apparatus and method capable of effectively providing mobile communication services. Specifically, they provide a procedure for energy saving of a base station and a terminal.

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

[0011] A method of a terminal in a wireless communication system according to one embodiment of the present disclosure may include: receiving a discovery signal from a base station; confirming that the base station is present in the vicinity of the terminal based on the discovery signal and transmitting a terminal request signal to the base station requesting the transmission of a synchronization signal; and receiving an on-demand synchronization signal block (SSB) from the base station corresponding to the terminal request signal, which is composed of at least some combination of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0012] A method of a base station in a wireless communication system according to one embodiment of the present disclosure may include: transmitting a discovery signal to a terminal indicating that the base station is present in the vicinity of a terminal; receiving a terminal request signal from the terminal requesting the transmission of a synchronization signal based on the discovery signal; and transmitting an on-demand synchronization signal block (SSB) to the terminal corresponding to the terminal request signal, the on-demand synchronization signal block being composed of at least some combination of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0013] According to one embodiment of the present disclosure, in a wireless communication system, a terminal comprises: a transceiver; and a control unit. The control unit receives a discovery signal from a base station, confirms that the base station is present in the vicinity of the terminal based on the discovery signal, controls the transmission of a terminal request signal requesting the transmission of a synchronization signal to the base station, and can receive an on-demand synchronization signal block (SSB) from the base station that corresponds to the terminal request signal and is composed of at least some combination of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0014] According to one embodiment of the present disclosure, a base station in a wireless communication system comprises: a transceiver; and a control unit. The control unit may: control the transmission of a discovery signal indicating that the base station is present in the vicinity of a terminal to the terminal; receive a terminal request signal from the terminal requesting the transmission of a synchronization signal based on the discovery signal; and control the transmission of an on-demand synchronization signal block (SSB) to the terminal, which corresponds to the terminal request signal and is composed of at least some combination of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH).

[0015] Embodiments of the present disclosure provide a transceiver device and method for a terminal and a base station that improve frequency usage efficiency in a mobile communication system. Specifically, according to at least one embodiment of the present disclosure, the base station and the terminal can effectively perform an initial connection procedure for energy saving between the base station and the terminal.

[0016] The effects obtainable from the disclosed embodiments are not limited to those mentioned above, and other unmentioned effects can be clearly derived and understood by a person skilled in the art based on the following detailed description.

[0017] FIG. 1 is a diagram showing the basic structure of the time-frequency resource domain of a 5G system according to one embodiment of the present disclosure.

[0018] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0019] FIG. 3 is a diagram illustrating a procedure in which a terminal reports terminal capability (UE capability) information to a base station according to one embodiment of the present disclosure.

[0020] FIG. 4 is a drawing showing an example of a bandwidth portion setting according to an embodiment of the present disclosure.

[0021] FIG. 5 is a diagram showing the interrelationship between frequency bands and coverage according to one embodiment of the present disclosure.

[0022] FIG. 6 is a diagram showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0023] FIG. 7 is a drawing showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0024] FIG. 8 is a drawing showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0025] FIG. 9 is a drawing showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0026] FIG. 10 is a diagram illustrating an initial connection procedure of a terminal utilizing a discovery signal according to one embodiment of the present disclosure.

[0027] FIG. 11 is a drawing showing an example of an SSB mapping pattern according to one embodiment of the present disclosure.

[0028] FIG. 12 is a diagram showing an example of controlling the transmission of an actual SSB among an SSB mapping pattern according to one embodiment of the present disclosure.

[0029] FIG. 13 is a diagram showing the superposition of SSB and PDCCH or PDSCH according to one embodiment of the present disclosure.

[0030] FIG. 14 is a diagram showing an example of base station operation for an SSB and a PDCCH according to one embodiment of the present disclosure.

[0031] FIG. 15 is a diagram showing an example of terminal operation for an SSB and a PDCCH according to one embodiment of the present disclosure.

[0032] FIG. 16 is a diagram showing an example of base station operation for SSB and PDSCH according to one embodiment of the present disclosure.

[0033] FIG. 17 is a diagram showing an example of terminal operation for SSB and PDSCH according to one embodiment of the present disclosure.

[0034] FIG. 18 is a diagram showing an example of a terminal initial connection procedure and operation according to terminal state according to an embodiment of the present disclosure.

[0035] FIG. 19 is a diagram showing an example of terminal operation during an initial connection procedure of a terminal according to one embodiment of the present disclosure.

[0036] FIG. 20 is a diagram showing an example of base station operation to support a terminal initial connection procedure according to one embodiment of the present disclosure.

[0037] FIG. 21 is a drawing showing a terminal transceiver device according to one embodiment of the present disclosure.

[0038] FIG. 22 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0039] FIG. 23 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0040] The implementation of the present disclosure will be described in detail below with reference to the accompanying drawings. Furthermore, in describing the present disclosure, if it is determined that a detailed description of related known functions or configurations would unnecessarily obscure the essence of the present disclosure, such detailed description will be omitted. Additionally, the terms described below are defined considering their functions in the present disclosure, and these may vary depending on the intentions or practices of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0041] The advantages and features of the present disclosure and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below but may be implemented in various different forms. The embodiments provided are merely to make the present disclosure complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0042] 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 may create means for performing the functions described in the flow diagram block(s). Since these computer program instructions may 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 may also be able to produce a manufactured item containing instruction means for performing 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).

[0043] Additionally, each block may represent a module, segment, and / or part of code containing one or more executable instructions for executing a specified logical function(s). Also, it should 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.

[0044] In this embodiment, the term "part" used may refer to software or hardware components such as FPGAs (Field Programmable Gate Arrays) or ASICs (Application Specific Integrated Circuits), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and / or 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.

[0045] In the present disclosure, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B or C,” “at least one of A, B and C,” and “at least one of A, B, or C” may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish a corresponding component from another corresponding component and do not limit the corresponding components in other aspects (e.g., importance or order).

[0046] In describing the present disclosure below, if it is determined that a detailed description of related known functions or configurations could unnecessarily obscure the essence of the present disclosure, such detailed description will be omitted. Embodiments of the present disclosure will be described below with reference to the attached drawings.

[0047] Terms used in the following description to identify connection nodes, terms referring to network entities, terms referring to messages, terms referring to interfaces between network entities, terms referring to various identification information, etc., are examples provided for the convenience of explanation. Accordingly, the present disclosure is not limited to the terms described below, and other terms referring to objects having equivalent technical meanings may be used.

[0048] In the following description, the terms "physical channel" and "physical signal" may be used interchangeably with "data" or "control signal." For example, PDSCH (physical downlink shared channel) is a term referring to a physical channel through which data is transmitted, but PDSCH may also be used to refer to data. That is, in this disclosure, the expression "transmits a physical channel" may be interpreted as equivalent to the expression "transmits data or a signal through a physical channel."

[0049] In the present disclosure, upper layer signaling may refer to a signal transmission method transmitted from a base station to a terminal using a physical layer downlink data channel, or from a terminal to a base station using a physical layer uplink data channel. Upper layer signaling may be understood as a Master Information Block (MIB), System Information Block (SIB), Radio Resource Control (RRC) signaling, or Media Access Control (MAC) control element (CE).

[0050] For the convenience of the following description, the present disclosure uses terms and names defined in the 3GPP NR (New Radio: 5th generation mobile communication standard) specifications. However, the present disclosure is not limited to the above terms and names and may be applied equally to systems conforming to other standards. For example, regarding 6G systems, which are still in the early stages of standardization discussion, terms and names defined in 5G systems may be generalized and used to describe the operation of 6G systems unless otherwise specifically noted.

[0051] Hereinafter, the base station is an entity that performs resource allocation for terminals and may be at least one of a gNodeB, gNB, eNodeB, eNB, NodeB, BS (Base Station), wireless access unit, base station controller, or a node on a network. The terminal may include a UE (User Equipment), MS (Mobile Station), cellular phone, smartphone, computer, IoT device, sensor, or multimedia system capable of performing communication functions. Of course, it is not limited to the examples described.

[0052] While existing mobile communication systems focused on conventional voice / data communication, 5G systems aim to satisfy various services and requirements, such as enhanced mobile broadband (eMBB) services to improve existing voice / data communication, ultra-reliable and low latency communication (URLLC) services, and massive machine type communication (MTC) services to support mass communication of the machine.

[0053] While the transmission bandwidth per carrier of existing mobile communication systems, such as LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access)) and LTE-A (LTE-Advanced or E-UTRA Evolution), is limited to a maximum of 20 MHz, 5G systems utilize significantly wider ultra-wide bandwidths to primarily aim for ultra-high-speed data services reaching several Gbps. Accordingly, 5G systems are considering ultra-high frequency bands ranging from several GHz to a maximum of 100 GHz as operating frequencies, where securing ultra-wide bandwidth frequencies is relatively easy. Additionally, it is possible to secure wide bandwidth frequencies for 5G systems through frequency reallocation or allocation from frequency bands ranging from hundreds of MHz to several GHz used by existing mobile communication systems.

[0054] Radio waves in the ultra-high frequency band have wavelengths of several millimeters and are also called millimeter waves (mmWave). However, in the ultra-high frequency band, path loss of radio waves increases in proportion to the frequency band, so the coverage of mobile communication systems can be reduced.

[0055] According to one embodiment, to overcome the disadvantage of reduced coverage in the ultra-high frequency band, beamforming technology can be applied by using multiple antennas to concentrate the radiated energy of radio waves toward a predetermined target point, thereby increasing the reach of the radio waves. That is, a signal to which beamforming technology is applied has a relatively narrower beam width, and since the radiated energy is concentrated within the narrowed beam width, the reach of the radio waves can be increased. Beamforming technology can be applied to both the transmitting end and the receiving end. In addition to the effect of increasing coverage, beamforming technology may have the effect of reducing interference in areas other than the beamforming direction. For beamforming technology to operate properly, accurate measurement and feedback methods of the transmitting and / or receiving beams may be required. Beamforming technology can be applied to a control channel or data channel that corresponds one-to-one between a predetermined terminal and a base station. In addition, beamforming technology can be applied to common signals transmitted by a base station to multiple terminals within the system, such as synchronization signals, physical broadcast channels (PBCH), control channels for transmitting system information, and data channels, to increase coverage. When applying beamforming technology to common signals, beam sweeping technology, which changes the beam direction to transmit the signal, is additionally applied to ensure that the common signal reaches terminals located at any position within the cell.

[0056] Another requirement for 5G systems is ultra-low latency services, where the transmission delay between the transmitter and receiver is approximately 1ms. As a measure to reduce transmission delay, it is necessary to design a frame structure based on a short TTI (transmission time interval) that is shorter than that of LTE and LTE-A. TTI is the basic time unit for performing scheduling, and the TTI of existing LTE and LTE-A systems is 1ms, which corresponds to the length of one subframe. For example, in 5G systems, short TTIs such as 0.5ms, 0.25ms, and 0.125ms are possible, which are shorter than those of existing LTE and LTE-A systems, to satisfy the requirements for ultra-low latency services.

[0057] FIG. 1 is a diagram showing the basic structure of a time-frequency resource area, which is a wireless resource area where data or control channels of a 5G system according to one embodiment of the present disclosure are transmitted.

[0058] Referring to FIG. 1, the horizontal axis represents the time domain and the vertical axis represents the frequency domain. The minimum transmission unit of a 5G system in the time domain is an OFDM (orthogonal frequency division multiplexing) symbol, A number of symbols (102) are combined to form a slot (106), and A number of slots can be combined to form a single subframe (105). The length of a single subframe (105) is 1.0 ms, and 10 subframes can be combined to form a single frame (114), and the length of the frame (114) is 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth is a total of N BW It can be composed of several subcarriers (104).

[0059] According to one embodiment, the basic unit of a resource in the time-frequency domain can be represented as a resource element (RE) (112) with an OFDM symbol index and a subcarrier index. A resource block (RB or Physical Resource Block, PRB) in the frequency domain It can be defined as a series of consecutive subcarriers (110). In a 5G system = 12, and the data rate can increase in proportion to the number of RBs scheduled to the terminal.

[0060] According to one embodiment, in a 5G system, a base station maps data in RB units and can generally perform scheduling on RBs that constitute one slot for a given terminal. That is, in a 5G system, the basic time unit for which scheduling is performed is a slot, and the basic frequency unit for which scheduling is performed may be an RB.

[0061] According to one embodiment, the number of OFDM symbols It can be determined by the length of the cyclic prefix (CP) added to each symbol to prevent interference between symbols. For example, if a normal CP is applied = 14, if Extended CP is applied = 12. Extended CP is applied to systems with relatively longer transmission distances than standard CP, enabling the maintenance of orthogonality between symbols. In the case of standard CP, the ratio of CP length to symbol length is maintained at a constant value, allowing the overhead caused by CP to remain constant regardless of the subcarrier spacing. That is, if the subcarrier spacing is small, the symbol length increases, and consequently, the CP length can also increase. Conversely, if the subcarrier spacing is large, the symbol length decreases, and consequently, the CP length can be reduced. The symbol length and CP length can be inversely proportional to the subcarrier spacing.

[0062] In 5G systems, various frame structures can be supported by adjusting the subcarrier spacing to satisfy various services and requirements. For example, the characteristics according to the subcarrier spacing are as follows.

[0063] From the perspective of the operating frequency band, a larger subcarrier spacing can be advantageous for recovering phase noise in the high-frequency band.

[0064] - From the perspective of transmission time, a large subcarrier spacing shortens the symbol length in the time domain, and consequently shortens the slot length, which can be advantageous for supporting ultra-low latency services such as URLLC.

[0065] - From the perspective of cell size, a longer CP length allows for the support of larger cells, so a smaller subcarrier spacing allows for the support of relatively larger cells. In mobile communication, a cell can be a concept referring to an area covered by a single base station.

[0066] Subcarrier spacing and / or CP length are essential information for OFDM transmission and reception; therefore, the base station and the terminal must recognize the subcarrier spacing and CP length as common values ​​to enable smooth transmission and reception. shows the subcarrier spacing configuration (μ) and subcarrier spacing ( f), an example of the relationship between CP lengths can be shown.

[0067]

[0068] [Table 2] shows the number of symbols per slot for each subcarrier spacing setting (μ) in the case of general type CP ( ), number of slots per frame( ), and number of slots per subframe( Represents an example of ).

[0069]

[0070] [Table 3] shows the number of symbols per slot for each subcarrier spacing setting (μ) in the case of extended CP ( ), number of slots per frame( ), number of slots per subframe( Represents an example of ).

[0071]

[0072] A 5G system can satisfy various user requirements through coexistence or dual-mode operation with existing LTE or / and LTE-A (hereinafter LTE / LTE-A) systems. For example, the existing LTE / LTE-A system can provide stable system operation to the terminal, and the 5G system can perform the role of providing enhanced services to the terminal. Therefore, the frame structure of the 5G system needs to include at least the frame structure of LTE / LTE-A or a set of essential parameters (subcarrier spacing = 15 kHz).

[0073] For example, when comparing a frame structure with a subcarrier spacing setting μ=0 (hereinafter frame structure A) and a frame structure with a subcarrier spacing setting μ=1 (hereinafter frame structure B), it can be shown that compared to frame structure A, frame structure B has a subcarrier spacing and RB size that are twice as large, and a slot length and symbol length that are twice as small. In the case of frame structure B, two slots can form one subframe, and 20 subframes can form one frame.

[0074] By generalizing the frame structure of a 5G system, high scalability can be provided by ensuring that the essential parameter sets, such as subcarrier spacing, CP length, and / or slot length, have an integer multiple relationship with each other for each frame structure. Additionally, a subframe of a fixed length of 1ms can be defined to represent a reference time unit independent of the frame structure.

[0075] The frame structure of a 5G system can be applied to various scenarios. From the perspective of cell size, since a longer CP length enables support for larger cells, Frame Structure A can support relatively larger cells compared to Frame Structure B. From the perspective of operating frequency band, since a larger subcarrier spacing is advantageous for recovering phase noise in the high-frequency band, Frame Structure B can support relatively higher operating frequencies compared to Frame Structure A. From the perspective of service, since a shorter slot length—the basic time unit of scheduling—is advantageous for supporting ultra-low latency services such as URLLC, Frame Structure B may be relatively more suitable for URLLC services compared to Frame Structure A.

[0076] In a manner similar to the coexistence of 5G and LTE / LTE-A mentioned above, it may be necessary to design a system for the coexistence of 6G, which will arrive with the evolution of future communication systems, and existing systems such as 5G or LTE / LTE-A.

[0077] In the following description of the present disclosure, an uplink (UL) refers to a wireless link through which a terminal transmits data or control signals to a base station, and a downlink (DL) may refer to a wireless link through which a base station transmits data or control signals to a terminal.

[0078] According to one embodiment, in the initial access stage where a terminal first connects to the system, the terminal can synchronize downlink time and frequency from a synchronization signal transmitted by a base station through a cell search and obtain a cell ID. Then, the terminal can receive a physical broadcast channel (PBCH) using the obtained cell ID and obtain a master information block (MIB), which is essential system information, from the PBCH. The MIB may include at least some of the following information.

[0079] MIB ::= SEQUENCE {

[0080] systemFrameNumber BIT STRING (SIZE (6));

[0081] subCarrierSpacingCommon ENUMERATED {scs15or60, scs30or120},

[0082] ssb-SubcarrierOffset INTEGER (0..15);

[0083] dmrs-TypeA-Position ENUMERATED {pos2, pos3},

[0084] pdcch-ConfigSIB1 PDCCH-ConfigSIB1,

[0085] cellBarred ENUMERATED {barred, notBarred},

[0086] intraFreqReselection ENUMERATED {allowed, notAllowed},

[0087] spare BIT STRING (SIZE (1))

[0088] }

[0089] For example, the above essential system information may include at least one of the following: information regarding the location of a synchronization signal received by the terminal in the time domain and / or frequency domain; control information for the terminal to receive at least one of system information (or system information block, SIB) transmitted by the base station (which may be information for scheduling a data channel for receiving system information); information regarding whether the cell is connectable; and information regarding the SCS of the cell. The above essential system information may be referred to as system information.

[0090] Additionally, the terminal can receive system information transmitted by the base station to obtain cell-common transmission and reception control information. Cell-common transmission and reception control information may include random access control information, paging control information, and at least one of common control information for various physical channels and signals (at least one of channels and signals, such as an uplink control channel, an uplink data channel, a downlink control channel and a downlink data channel, a physical signal for obtaining uplink channel status information, a physical signal for obtaining downlink channel status information, and a physical signal for demodulating a physical channel). For example, the control information may be configuration information for each channel or signal. For example, the system information may be referred to as SIB1 or RMSI (remaining minimum system information).

[0091] According to one embodiment, the synchronization signal is a signal that serves as a reference for cell search, and a subcarrier spacing may be applied for each frequency band to suit channel environments such as phase noise. In the case of a data channel or control channel, as described above, the subcarrier spacing may be applied differently depending on the service type to support various services. In a 5G system, a combination consisting of a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and a PBCH (Physical broadcast channel) may be referred to as an SS / PBCH block or an SSB. For example, an SSB may consist of N1 PSS symbols, N2 SSS symbols, and N3 PBCH symbols.

[0092] In addition to the initial connection procedure, the terminal may also receive the SSB to determine whether the radio link quality of the current cell is maintained above a certain level. Furthermore, during the procedure for the terminal to perform a handover from the current cell to an adjacent cell, the terminal may receive the SSB of the adjacent cell to determine the radio link quality of the adjacent cell and to obtain time / frequency synchronization with the adjacent cell.

[0093] According to one embodiment, after the terminal obtains MIB and system information from the base station through an initial access procedure, the terminal may perform a random access procedure to transition the link with the base station from an idle state (or RRC_IDLE state) to a connected state (or RRC_CONNECTED state). Upon completion of the random access procedure, the terminal transitions to a connected state, and one-to-one communication between the base station and the terminal may become possible. The random access procedure will be described in detail below with reference to FIG. 2.

[0094] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0095] Referring to FIG. 2, as a first step (210) of the random access procedure, the terminal can transmit a random access preamble to the base station. The random access preamble, which is the initial transmission message of the terminal in the random access procedure, may be referred to as message 1. The base station can measure the transmission delay value between the terminal and the base station from the random access preamble and synchronize the uplink. At this time, the terminal can arbitrarily select which random access preamble to use from a set of random access preambles given in advance by system information. The initial transmission power of the random access preamble can be determined according to the path loss between the base station and the terminal measured by the terminal. Additionally, the terminal can determine the transmission beam direction of the random access preamble from the synchronization signal received from the base station and transmit the random access preamble.

[0096] According to one embodiment, in the second step (220), the base station may transmit a message to the terminal containing an uplink transmission timing control command based on a transmission delay value measured from the random access preamble received in the first step (210). The terminal may receive control information for scheduling the message over a downlink control channel and receive the message over a downlink data channel based on the control information. The message transmitted in the second step may be referred to as message 2, a response to the random access preamble, or a random access response. Additionally, the base station may transmit the message by including, as scheduling information, uplink resources to be used by the terminal to transmit a response message (message 3) to message 2 and power control commands to be applied to the response message. The scheduling information may include control information regarding the terminal's uplink transmission beam. Additionally, the message may further include a temporary identifier of the terminal to be used during the random access procedure. The information included in the message is merely an example, and one or more of the information described above may be included in message 2.

[0097] If the terminal does not receive message 2, which is scheduling information for message 3, from the base station within a predetermined time in the second step (220), the terminal may perform the first step (210) again. If the first step (210) is performed again, the terminal may increase the probability of receiving the random access preamble at the base station by increasing the transmission power of the random access preamble by a predetermined step (power ramping).

[0098] According to one embodiment, in the third step (230), the terminal can transmit uplink data (message 3) including its terminal ID to the base station via the uplink data channel (physical uplink shared channel, PUSCH) based on the uplink resources allocated in the second step (220). The transmission timing of the uplink data channel for transmitting Message 3 may follow the uplink transmission timing control command received from the base station in the second step (220). The transmission power of the uplink data channel for transmitting Message 3 may be determined by considering the power control command received from the base station in the second step (220) and the power ramping value of the random access preamble. The uplink data channel for transmitting Message 3 may refer to the first uplink data signal transmitted by the terminal to the base station after the transmission of the random access preamble. For example, the message 3 may include an upper layer message for the terminal to connect to the network.

[0099] According to one embodiment, if the base station determines in step 4 (240) that the terminal has performed random access without collision with other terminals, it may transmit data (message 4) containing the ID of the terminal that transmitted uplink data in step 3 (230) to the terminal. If the terminal receives the signal transmitted by the base station in step 4 (240) from the base station, it may determine that the random access was successful. The terminal may transmit HARQ-ACK information indicating successful reception of message 4 to the base station through the Physical Uplink Control Channel (PUCCH).

[0100] If the data transmitted by the terminal in the third step (230) collides with the data of another terminal and the base station fails to receive the data signal from the terminal, the base station may not transmit any further data to the terminal. Accordingly, if the terminal fails to receive the data transmitted from the base station in the fourth step (240) within a certain period of time, it is determined that the random access procedure has failed, and the process may be restarted from the first step (210).

[0101] The above-described four-step random access procedure is merely an example, and the information between the terminal and the base station described above may also be transmitted through messages other than the four-step message described above. For example, the terminal may transmit one or more messages containing at least one of the information of message 1 and message 3 to the base station simultaneously or sequentially, and the base station may transmit one or more messages containing at least one of the information of message 2 and message 4 to the terminal simultaneously or sequentially.

[0102] Upon successful completion of the random access procedure, the terminal transitions to a connected state, enabling one-to-one communication between the base station and the terminal. The base station can receive UE capability information from the terminal in the connected state. The base station can adjust scheduling by referring to the UE capability information of the terminal. Through the UE capability information, the terminal can inform the base station whether it supports certain functions and / or the maximum allowable value of the functions supported by the terminal. Therefore, the UE capability information reported by each terminal to the base station may be different for each terminal.

[0103] For example, the terminal may report UE capability information to the base station as UE capability information, including at least a portion of the following control information.

[0104] - Control information related to frequency bands supported by the terminal

[0105] - Control information related to channel bandwidth supported by the terminal

[0106] - Control information regarding the maximum modulation scheme supported by the terminal

[0107] - Control information regarding the maximum number of beams supported by the terminal

[0108] - Control information regarding the maximum number of layers supported by the terminal

[0109] - Control information related to CSI reporting supported by the terminal

[0110] - Control information on whether the terminal supports frequency hopping

[0111] - Bandwidth-related control information when Carrier Aggregation (CA) is supported

[0112] - Control information on whether cross-carrier scheduling is supported when carrier bundling is supported

[0113] FIG. 3 is a diagram illustrating a procedure in which a terminal reports terminal capability (UE capability) information to a base station according to one embodiment of the present disclosure.

[0114] Referring to FIG. 3, in step 310, the base station (302) can send a UE capability information request message to the terminal (301). In response to the base station's UE capability information request, the terminal can send UE capability information to the base station in step 320.

[0115] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0116] Figure 4 is a diagram illustrating an example of a bandwidth portion setting in a 5G communication system.

[0117] FIG. 4 shows an example in which the terminal bandwidth (UE bandwidth) (400) is configured into two bandwidth portions, namely bandwidth portion #1 (BWP#1) (401) and bandwidth portion #2 (BWP#2) (402). The base station may configure one or more bandwidth portions for the terminal and may configure the information in [Table 4] below for each bandwidth portion.

[0118] BWP ::= SEQUENCE {bwp-Id BWP-Id,(Bandwidth Identifier)locationAndBandwidth INTEGER (1..65536),(Bandwidth Location)subcarrierSpacing ENUMERATED {n0, n1, n2, n3, n4, n5},(Subcarrier Spacing)cyclicPrefix ENUMERATED { extended}(Cyclical Prefix)}

[0119] Of course, the above examples are not limited, and various parameters related to bandwidth portions may be configured for the terminal in addition to the above configuration information. The above information may be transmitted by the base station to the terminal via higher-layer signaling, for example, RRC (Radio Resource Control) signaling. At least one of the configured bandwidth portions may be activated. Whether a configured bandwidth portion is activated may be transmitted semi-statically from the base station to the terminal via RRC signaling or dynamically via DCI (downlink control information).

[0120] According to one embodiment, prior to the RRC connection, a terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from a base station via a Master Information Block (MIB). For example, during the initial connection phase, the terminal may receive configuration information regarding a Control Resource Set (CORESET) and a Search Space via the MIB, through which a Physical Downlink Control Channel (PDCCH) can be transmitted to receive System Information Blocks required for initial connection. The Control Resource Set and Search Space configured via the MIB may each be considered as Identity (ID) 0 (CORESET 0, Search Space 0). The base station may notify the terminal via the MIB of configuration information, such as frequency allocation information, time allocation information, and / or subcarrier interval settings, for Control Resource Set #0. Additionally, the base station may notify the terminal via the MIB of configuration information regarding the monitoring period and monitoring occasion for Control Resource Set #0, i.e., configuration information for Search Space #0. The terminal may consider the frequency region set as control region #0 obtained from the MIB as the initial bandwidth portion for initial access. In this case, the identifier (ID) of the initial bandwidth portion may be considered as 0.

[0121] The settings for the bandwidth portion supported by 5G can be used for various purposes.

[0122] According to one embodiment, if the bandwidth supported by the terminal is smaller than the system bandwidth, this can be supported through the bandwidth portion setting. For example, by setting the frequency position of the bandwidth portion (setting information 2) to the terminal, the terminal can transmit and / or receive data at a specific frequency position within the system bandwidth.

[0123] According to one embodiment, a base station may set multiple bandwidth portions for a terminal for the purpose of supporting different subcarrier spacing settings. For example, to support data transmission and reception using both a 15 kHz subcarrier spacing and a 30 kHz subcarrier spacing for a terminal, two bandwidth portions may be set to subcarrier spacings of 15 kHz and 30 kHz, respectively. Different bandwidth portions may be frequency division multiplexed (FDM), and when data is to be transmitted and received at a specific subcarrier spacing, the bandwidth portion set to that subcarrier spacing may be activated.

[0124] According to one embodiment, for the purpose of reducing the power consumption of the terminal, a base station may set a bandwidth portion having a bandwidth of different sizes for the terminal. For example, if the terminal supports a very large bandwidth, such as 100 MHz, and always transmits and receives data using that bandwidth, very large power consumption may occur. For example, in a situation where there is no traffic, monitoring an unnecessary downlink control channel using a large bandwidth of 100 MHz may be very inefficient in terms of power consumption. For the purpose of reducing the power consumption of the terminal, the base station may set a bandwidth portion of a relatively small bandwidth, such as 20 MHz, for the terminal. In a situation where there is no traffic, the terminal can perform monitoring operations in the 20 MHz bandwidth portion, and when data is generated, it can transmit and / or receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0125] Regarding the method of configuring the bandwidth portion, terminals prior to RRC connection (Connected) can receive configuration information for the Initial Bandwidth Part (Initial BWP) via the MIB during the initial connection phase. For example, a terminal can receive a configuration of a control area (i.e., CORESET) for a downlink control channel through which a DCI scheduling a System Information Block (SIB) can be transmitted from the MIB of the Physical Broadcast Channel (PBCH). The bandwidth of the control area configured based on the MIB can be considered as the Initial Bandwidth Part, and through this configured Initial Bandwidth Part, the terminal can receive the Physical Downlink Shared Channel (PDSCH) through which the SIB is transmitted. In addition to receiving the SIB, the Initial Bandwidth Part may also be utilized for paging or random access.

[0126] Next, downlink control information (DCI) in 5G systems will be explained in detail.

[0127] In a 5G system, scheduling information for uplink data (or physical uplink shared channel (PUSCH)) or scheduling information for downlink data (or physical downlink shared channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor the fallback DCI format and the non-fallback DCI format for PUSCH or PDSCH. The fallback DCI format may consist of fixed fields predefined between the base station and the terminal, and the non-fallback DCI format may include configurable fields.

[0128] According to one embodiment, the DCI can be transmitted through a physical downlink control channel (PDCCH) after undergoing channel coding and modulation processes. A cyclic redundancy check (CRC) is attached to the DCI message payload, and the CRC can be scrambled with the terminal's identity identifier (e.g., radio network temporary identifier, RNTI). Different RNTIs may be used depending on the purpose of the DCI message, e.g., terminal-specific (UE-specific) data transmission, power control commands, or random access responses. That is, the RNTI may not be explicitly transmitted but may be included in the CRC calculation process. Upon receiving a DCI message transmitted through the PDCCH, the terminal checks the CRC using the assigned RNTI, and if the result of the CRC check is correct, the terminal knows that the message has been transmitted to the terminal.

[0129] For example, a DCI scheduling a PDSCH for system information can be scrambled to SI-RNTI. For example, a DCI scheduling a PDSCH for a RAR message can be scrambled to RA-RNTI. For example, a DCI scheduling a PDSCH for a paging message can be scrambled to P-RNTI. A DCI notifying a SFI (slot format indicator) can be scrambled to SFI-RNTI. A DCI notifying a TPC (transmit power control) can be scrambled to TPC-RNTI. For example, a DCI scheduling a terminal-specific PDSCH or PUSCH can be scrambled to C-RNTI (cell RNTI).

[0130] According to one embodiment, a base station may operate by applying a predetermined DCI format to a terminal to be scheduled, depending on whether the DCI is for scheduling information for downlink data (downlink assignment), scheduling information for uplink data (uplink grant), and / or for DCI for purposes other than data scheduling, such as power control.

[0131] The base station can transmit downlink data to the terminal via the Physical Downlink Shared Channel (PDSCH), which is a physical channel for downlink data transmission. Scheduling information, such as specific mapping locations in the time and frequency domains of the PDSCH, modulation schemes, HARQ-related control information, and power control information, can be provided by the base station to the terminal through the DCI related to downlink data scheduling information among the DCIs transmitted via the PDSCH.

[0132] According to one embodiment, the terminal can transmit uplink data to a base station via a physical uplink shared channel (PUSCH), which is a physical channel for transmitting uplink data. Scheduling information, such as specific mapping locations in the time and frequency domains of the PUSCH, modulation schemes, HARQ-related control information, and power control information, can be provided by the base station to the terminal through a DCI related to uplink data scheduling information among the DCIs transmitted via the PDCCH.

[0133] According to one embodiment, the time-frequency resource to which the PDCCH is mapped is called a control resource set (CORESET). In the frequency domain, the CORESET can be set to all or part of the frequency resources of the bandwidth supported by the terminal. In the time domain, it can be set to one or more OFDM symbols, which can be defined as the CORESET duration. A base station can set one or more CORESETs to the terminal through upper-layer signaling (e.g., System Information, Master Information Block (MIB), Radio Resource Control (RRC) signaling). Setting a CORESET to the terminal may mean providing information such as the CORESET identity, the frequency location of the CORESET, and the symbol length of the CORESET. The information provided by the base station to the terminal to set the CORESET may include at least some of the information included in [Table 5].

[0134] ControlResourceSet ::= SEQUENCE {controlResourceSetId ControlResourceSetId,(CORESET Identifier)frequencyDomainResources BIT STRING (SIZE (45)),(Frequency Domain Resource)duration INTEGER (1..maxCoReSetDuration),(CORESET Length)cce-REG-MappingType CHOICE {(CCE-to-REG Mapping Type)interleaved SEQUENCE {reg-BundleSize ENUMERATED {n2, n3, n6},(REG Bundle Size)interleaverSize ENUMERATED {n2, n3, n6},(Interleaver Size)shiftIndex INTEGER(0..maxNrofPhysicalResourceBlocks-1) OPTIONAL -- Need S(Interleaver Shift)},nonInterleaved NULL},precoderGranularity ENUMERATED {sameAsREG-bundle, allContiguousRBs},(Precoding Unit)tci-StatesPDCCH-ToAddList SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP(QCL Configuration Info)tci-StatesPDCCH-ToReleaseList SEQUENCE(SIZE (1..maxNrofTCI-StatesPDCCH)) OF TCI-StateId OPTIONAL, -- Cond NotSIB1-initialBWP(QCL Configuration Info)tci-PresentInDCI ENUMERATED {enabled} OPTIONAL, -- Need S(QCL Directive Configuration Info within DCI)pdcch-DMRS-ScramblingID INTEGER (0..65535) OPTIONAL, -- Need S(PDCCH DMRS Scrambling Identifier)}

[0135] According to one embodiment, the CORESET is in the frequency domain It can be composed of RBs, and in the time domain It can be composed of ∈{1,2,3} symbols. A PDCCH can be composed of one or more CCEs (Control Channel Elements). One CCE can be composed of six REGs (Resource Element Groups), and a REG can be defined as one RB during one OFDM symbol. Within a CORESET, REGs can be indexed in time-first order starting with REG index 0, beginning with the first OFDM symbol of the CORESET, the lowest RB.

[0136] According to one embodiment, interleaved and non-interleaved methods may be supported as transmission methods for PDCCH. The base station may set whether to perform interleaved or non-interleaved transmission for each CORESET to the terminal through upper-layer signaling. Interleaving may be performed on a REG bundle basis. A REG bundle may be defined as a set of one or more REGs. Based on whether to perform interleaved or non-interleaved transmission set by the base station, the terminal may determine the CCE-to-REG mapping method in the CORESET in the manner shown in [Table 6] below.

[0137]

[0138] According to one embodiment, the base station can notify the terminal of configuration information, such as which symbol the PDCCH is mapped to within the slot and the transmission period, through signaling.

[0139] According to one embodiment, the search space of a PDCCH may be described as follows. The number of CCEs required to transmit a PDCCH may be 1, 2, 4, 8, or 16 depending on the Aggregation Level (AL), and different numbers of CCEs may be used for link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel may be transmitted through L CCEs. The terminal performs blind decoding to detect a signal without knowing information about the downlink control channel, and for this purpose, a search space representing a set of CCEs may be defined. The search space is a set of downlink control channel candidates consisting of CCEs that the terminal must attempt to decode at a given aggregation level, and since there are various aggregation levels that form a bundle of 1, 2, 4, 8, or 16 CCEs, the terminal may have multiple search spaces. A Search Space Set can be defined as a set of search spaces at all established aggregation levels.

[0140] Search spaces can be classified into Common Search Spaces (CSS) and UE-specific Search Spaces (USS). A certain group of terminals or all terminals may monitor the Common Search Space of the PDCCH to receive cell-common control information, such as dynamic scheduling or paging messages for System Information Blocks (SIBs). For example, a terminal may receive scheduling allocation information for the PDSCH for receiving system information by monitoring the Common Search Space of the PDCCH. In the case of the Common Search Space, since a certain group of terminals or all terminals must receive the PDCCH, it may be defined as a set of pre-agreed CCEs. Scheduling allocation information for the UE-specific PDSCH or PUSCH may be received by the terminal by examining the UE-specific Search Space of the PDCCH. The UE-specific Search Space may be defined specifically as a function of the terminal's ID (Identity) and various system parameters.

[0141] According to one embodiment, a base station may set configuration information for the search space of a PDCCH to a terminal through upper layer signaling (e.g., SIB, MIB, RRC signaling). For example, the base station may set to the terminal the number of PDCCH candidates at each aggregation level L, the monitoring period for the search space, the occasion for monitoring in slot-symbol units for the search space, the search space type (common search space or terminal-specific search space), the combination of DCI format and RNTI to be monitored in the search space, and the CORESET index to be monitored in the search space. For example, parameters for the search space of a PDCCH may include at least one of the information shown in [Table 7] below.

[0142] SearchSpace ::= SEQUENCE {searchSpaceId SearchSpaceId,(searchspace identifier)controlResourceSetId ControlResourceSetId OPTIONAL, -- Cond SetupOnly(CORESET identifier)monitoringSlotPeriodicityAndOffset CHOICE {(monitoring slot level period and offset)sl1 NULL,sl2 INTEGER (0..1),sl4 INTEGER (0..3),sl5 INTEGER (0..4),sl8 INTEGER (0..7),sl10 INTEGER (0..9),sl16 INTEGER (0..15),sl20 INTEGER (0..19),sl40 INTEGER (0..39),sl80 INTEGER (0..79),sl160 INTEGER (0..159),sl320 INTEGER (0..319),sl640 INTEGER (0..639),sl1280 INTEGER (0..1279),sl2560 INTEGER (0..2559)} OPTIONAL, -- Cond Setupduration INTEGER (2..2559) OPTIONAL, -- Need R(모니터링 가라)monitoringSymbolsWithinSlot BIT STRING (SIZE (14)) OPTIONAL, -- Cond Setup(슬롘 내 모리스 심보운지)nrofCandidates SEQUENCE {(집성 별별 PDCCH 이리군 수) aggregationLevel1 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel2 ENUMERATED {n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel4 ENUMERATED { n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel8 ENUMERATED { n0, n1, n2, n3, n4, n5, n6, n8}, aggregationLevel16 ENUMERATED { n0, n1, n2, n3, n4,n5,n6,n8}} OPTIONAL. Need RaggregationLevel4 ENUMERATED {n1, n2} OPTIONAL, -- Need RaggregationLevel8 ENUMERATED {n1, n2} OPTIONAL, -- Need RaggregationLevel16 ENUMERATED {n1, n2} OPTIONAL -- Need R},...} OPTIONAL, -- Need Rdci-Format2-1 SEQUENCE {...} OPTIONAL, -- Need Rdci-Format2-2 SEQUENCE {...} OPTIONAL, -- Need Rdci-Format2-3 SEQUENCE {dummy1 ENUMERATED {sl1, sl2, sl4, sl5, sl8, sl10, sl16, sl20} OPTIONAL, -- Cond Setupdummy2 ENUMERATED {n1, n2},...} OPTIONAL -- Need R},ue-Specific SEQUENCE {(Terminal-Specific Search Space)dci-Formats ENUMERATED {formats0-0-And-1-0, formats0-1-And-1-1},...,}} OPTIONAL -- Cond Setup2}.

[0143] According to one embodiment, based on configuration information, a base station may set one or more sets of search spaces for a terminal. According to one embodiment, a base station may set search space set 1 and search space set 2 for a terminal. In search space set 1, the terminal may be configured to monitor DCI format A scrambled with X-RNTI in a common search space, and in search space set 2, the terminal may be configured to monitor DCI format B scrambled with Y-RNTI in a terminal-specific search space.

[0144] According to one embodiment, based on configuration information, one or more sets of search spaces may exist in a common search space or a terminal-specific search space. For example, search space set #1 and search space set #2 may be configured as a common search space, and search space set #3 and search space set #4 may be configured as a terminal-specific search space.

[0145] According to one embodiment, in a common search space, a terminal can monitor at least one of the following combinations of DCI format and RNTI. However, the scope of the present invention is not limited to the following examples.

[0146] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, SP-CSI-RNTI, RA-RNTI, TC-RNTI, P-RNTI, SI-RNTI

[0147] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0148] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0149] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0150] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0151]

[0152] In a terminal-specific search space, the terminal may monitor at least one of the following combinations of DCI format and RNTI. However, the scope of the present invention is not limited to the following examples.

[0153] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0154] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0155] RNTIs may follow at least one of the following definitions and uses.

[0156] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH or PUSCH scheduling

[0157] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0158] CS-RNTI (Configured Scheduling RNTI): Used for semi-static terminal-specific PDSCH scheduling.

[0159] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling in the random access phase

[0160] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0161] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0162] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH has been punctured.

[0163] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0164] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0165] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0166] The DCI formats described above may follow the definitions in [Table 8] below.

[0167]

[0168] In CORESET p and search space set s, the search space of aggregation level L can be expressed as Equation 1 below.

[0169] [Mathematical Formula 1]

[0170]

[0171] The value may be 0 for the common search space.

[0172] In the case of a terminal-specific search space, the value may correspond to a value that changes according to the terminal's ID (C-RNTI or the ID set by the base station for the terminal) and the time index.

[0173] The following describes in detail how a terminal measures channel conditions in a 5G communication system and reports them to a base station.

[0174] Channel state information (CSI) may include at least one of the following information.

[0175] - Channel Quality Indicator (CQI): CQI index indication information consisting of a modulation scheme and coding rate that satisfy the predefined minimum receive error rate of PDSCH.

[0176] - Precoding Matrix Indicator (PMI): Precoding matrix indicator information selected by the terminal

[0177] - CRI (CSI-RS resource indicator): CSI-RS information measured by the terminal

[0178] - RI (Rank Indicator): Rank indicator information selected by the terminal

[0179] - LI (Layer indicator): Indicator information for the best layer among the precoding matrices reported by the terminal

[0180] - SSBRI (SS / PBCH block resource indicator): SSB information measured by the terminal

[0181] - L1-RSRP (Reference Signal Received Power): L1 RSRP information measured by the terminal

[0182] The base station can control at least one of the time and frequency resources for the aforementioned CSI measurement and reporting of the terminal.

[0183] According to one embodiment, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods may be supported for CSI measurement and reporting operations, and the base station may set which method to use for the terminal through signaling. For example, the semi-persistent CSI reporting method may support 'PUCCH-based semi-persistent (semi-PersistentOnPUCCH)' and 'PUSCH-based semi-persistent (semi-PersistentOnPUSCH)'. In the case of the periodic or semi-persistent CSI reporting method, the terminal may receive a PUCCH or PUSCH resource to transmit the CSI from the base station through upper-layer signaling. The period and slot offset of the PUCCH or PUSCH resource to transmit the CSI may be provided by the subcarrier interval setting of the uplink (UL) bandwidth part configured for CSI reporting transmission. In the case of a non-periodic CSI reporting method, the terminal can receive a PUSCH resource to transmit the CSI from the base station via L1 signaling (the aforementioned DCI format 0_1) through scheduling.

[0184] According to one embodiment, non-periodic CSI reporting of the terminal may use PUSCH, and periodic CSI reporting may use PUCCH. Additionally, semi-permanent CSI reporting may be performed using PUSCH when triggered or activated by DCI, and using PUCCH after being activated by a MAC control element (MAC CE).

[0185] According to one embodiment, a non-periodic CSI report can be triggered by the "CSI request" field of the aforementioned DCI format 0_1, which corresponds to the scheduling DCI for PUSCH.

[0186] As a measure to support ultra-high-speed data services, 5G systems can support signal transmission and reception with ultra-wide bandwidths of tens to hundreds of MHz or several GHz. The above ultra-wide bandwidth signal transmission and reception can be supported through a single component carrier (CC) or through Carrier Aggregation (CA) technology that combines multiple component carriers. For example, if a mobile operator has not secured a frequency bandwidth sufficient for providing ultra-high-speed data services using a single component carrier, Carrier Aggregation technology can combine individual component carriers with relatively small bandwidths to increase the total frequency bandwidth and consequently enable ultra-high-speed data services.

[0187] According to one embodiment, the frequency band utilized by the 5G system can be extensive, ranging from hundreds of MHz to tens of GHz.

[0188] FIG. 5 illustrates the interrelationship between frequency bands, coverage, and bandwidth. FIG. 5 shows the frequency bands of the low band (501), mid band (502), high band (503), and ultra-high band (504). Generally, the lower the frequency band, the greater the coverage due to relatively less path loss, while the higher the frequency band, the smaller the coverage due to relatively higher path loss. In low frequency bands, frequencies available for mobile communication are fragmented, resulting in small bandwidth, whereas in high frequency bands, it is relatively easy to secure wide bandwidth frequencies, making them suitable for ultra-high-speed data services. As mobile communication systems evolve, efforts are being made to discover and utilize new frequency bands. For example, the next-generation mobile communication system, 6G (6 th In generation mobile communication systems, the 7 to 15 GHz band, called the upper midband, is being considered as one of the candidate frequencies.

[0189] Mobile operators can secure multiple frequency bands to provide mobile communication services to users. For example, a mobile operator can combine existing frequency bands for LTE systems with newly secured frequency bands for 5G systems to operate a combined LTE and 5G system (e.g., EN(EUTRAN-NR)-DC(dual connectivity)). As another example, a mobile operator can secure frequency bands for 5G systems across multiple bands and then combine the frequencies from those bands to provide mobile communication services through 5G CA. Similarly, a 6G mobile communication system can provide mobile communication services through 6G CA by combining 6G frequencies with existing 4G or 5G frequencies, or by combining 6G frequencies with each other.

[0190] As mentioned above, since characteristics such as coverage and bandwidth vary depending on the frequency band, there is a growing trend toward mobile communication services that combine multiple frequency bands rather than those relying on a single frequency band.

[0191] According to one embodiment, as another method for supporting ultra-high-speed data services, there may be a method of increasing the data rate through a spatial multiplexing method using multiple transmitting and receiving antennas. The number of power amplifiers (PAs) required may also increase in proportion to the number of transmitting antennas equipped in the base station or terminal. The maximum output of the base station and terminal depends on the characteristics of the power amplifiers, and generally, the maximum output of the base station varies depending on the cell size covered by the base station. Typically, the maximum output can be expressed in dBm units. The maximum output of the terminal may typically be 23 dBm or 26 dBm.

[0192] According to one embodiment, as an example of a commercial 5G base station, the base station may be equipped with 64 transmitting antennas and corresponding 64 power amplifiers in the 3.5 GHz frequency band and operate at a bandwidth of 100 MHz. Consequently, the energy consumption of the base station increases in proportion to the output of the power amplifiers and the operating time of the power amplifiers. Compared to LTE base stations, 5G base stations have a relatively higher operating frequency band, so they may be characterized by having a wide bandwidth and many transmitting antennas. While this characteristic has the effect of increasing the data rate, it may result in costs associated with increased energy consumption of the base station. Therefore, the more base stations constituting a mobile communication network there are, the greater the energy consumption of the entire mobile communication network may become in proportion to that number.

[0193] According to one embodiment, the energy consumption of a base station may be largely determined by the operation of a power amplifier. Since the power amplifier is involved in the base station transmission operation, the base station's downlink (DL) transmission operation is highly related to the base station's energy consumption. Relatively speaking, the base station's uplink (UL) reception operation does not account for a large proportion of the base station's energy consumption. The physical channel and physical signal transmitted by the base station via the downlink may be as follows.

[0194] - PDSCH (Physical Downlink Shared Channel): A downlink data channel containing data to be transmitted to one or more terminals.

[0195] - PDCCH (Physical Downlink Control Channel): A downlink control channel containing scheduling information for PDSCH and PUSCH (Physical Uplink Control Channel). Alternatively, PDCCH alone can transmit control information such as slot formats and power control commands without the PDSCH or PUSCH to be scheduled. The scheduling information includes resource information mapped to the PDSCH or PUSCH, HARQ (hybrid automatic repeat request) related information, power control information, etc.

[0196] - PBCH (Physical Broadcast Channel): A downlink broadcast channel that provides the MIB (Master Information Block), which is essential system information required for the transmission and reception of the terminal's data and control channels.

[0197] - PSS (Primary Synchronization Signal): A signal that serves as the reference for DL ​​time / frequency synchronization and provides some cell ID information.

[0198] - SSS (Secondary Synchronization Signal): A signal that serves as the reference for DL ​​time and / or frequency (hereinafter time / frequency) synchronization and provides the cell ID and some other information.

[0199] - DM-RS (Demodulation Reference Signal): A reference signal for terminal channel estimation for each of PDSCH, PDCCH, and PBCH.

[0200] - CSI-RS (Channel-state Information Reference Signal): A downlink signal that serves as a reference for measuring the downlink channel state of a terminal.

[0201] - PT-RS (Phase-tracking Reference Signal): Downlink signal for phase tracking

[0202] According to one embodiment, from the perspective of base station energy saving, if the base station stops downlink transmission operation, the resulting cessation of power amplifier operation can enhance the base station energy saving effect. Additional energy savings may be possible by reducing the operation of other base station devices, such as baseband devices, in addition to the power amplifier. Similarly, even if uplink reception operation accounts for a relatively small proportion of the base station's total energy consumption, additional energy savings can be obtained if the uplink reception operation can be stopped.

[0203] Various methods for saving base station energy are described below with reference to FIGS. 6, FIGS. 7, FIGS. 8, and / or FIGS. 9.

[0204] - Base Station Energy Saving Method 1: The downlink transmission operation of a base station may depend on the amount of downlink traffic. For example, if there is no data to be transmitted to a terminal via the downlink, the base station does not need to transmit PDSCH and PDCCH for scheduling PDSCH. Or, if data transmission can be temporarily suspended for reasons such as the data not being sensitive to transmission delay, the base station may not transmit PDSCH or / and PDCCH. For example, this is illustrated with reference to FIG. 6. FIG. 6 is a diagram illustrating an example of a base station energy saving method according to an embodiment of the present disclosure. Referring to FIG. 6, the amount of traffic that the base station intends to transmit may be maintained at a high level above a threshold during the T1 period (610) and the T3 period (630), and the amount of traffic that the base station intends to transmit may be maintained at a low level below a threshold during the T2 period (620). At this time, the base station may stop or minimize the operation of the base station power amplifier, the operation of the base station RF (radio frequency) device, and / or the operation of the base band device by not transmitting the PDSCH for data transmission and the PDCCH for scheduling the PDSCH during the T2 period. In this case, the energy of the base station may be saved. Additionally, if the traffic intended to be processed during the T2 period is not sensitive to transmission delay, the base station may defer transmission during the T2 period and perform delayed transmission during the T3 period. On the other hand, the base station may transmit the PDSCH (602) for data transmission and the PDCCH (601) for scheduling the PDSCH without restriction during the T1 and T3 periods so that there is no hindrance to the provision of communication services by the base station. For example, the state of the base station during the T1 and T3 periods is referred to as the base station normal state, and the state of the base station during the T2 period is referred to as the base station energy saving state (ES state).The threshold for the above traffic amount may be communicated to the base station by an entity governing base station operations (e.g., AMF (access and mobility management function), SMF (session management function), PCF (policy control function)) through signaling, or the base station may determine it on its own.

[0205] - Base Station Energy Saving Method 2: Physical channels and physical signals such as PSS, SSS, PBCH, and / or CSI-RS can be transmitted repeatedly at a predetermined period regardless of data transmission to the terminal. Therefore, even if the terminal does not receive data, it can continuously update downlink time / frequency synchronization, downlink channel status, and / or radio link quality. That is, PSS, SSS, PBCH, and / or CSI-RS are essentially transmitted over the downlink regardless of downlink data traffic, and this can cause base station energy consumption. Therefore, the energy consumption of the base station can be reduced by controlling the transmission of signals unrelated to (or less relevant to) data traffic to occur less frequently. This is illustrated with an example through FIG. 7. FIG. 7 is a diagram illustrating an example of a base station energy saving method according to an embodiment of the present disclosure. Referring to FIG. 7, in the T1 (710) and T3 (730) sections, which are the base station normal state, the base station can transmit periodic signals (703), such as PSS, SSS, PBCH, and / or CSI-RS, with a predefined transmission period 1 (701). On the other hand, in the T2 (720) section, which is the base station power saving state, the base station can save base station energy by transmitting periodic signals (704) with a transmission period 2 (702), which is relatively longer than the transmission period 1 (701), thereby intermittently performing or minimizing the operation of the base station power amplifier, base station RF device, baseband device, etc.

[0206] - Base Station Energy Saving Method 3: The base station can reduce energy consumption by switching off at least a part of the base station's antenna or power amplifier. This is illustrated, for example, through Fig. 8.

[0207] - FIG. 8 is a diagram illustrating an example of a base station energy saving method according to an embodiment of the present disclosure. Referring to FIG. 8, in the base station normal state, in the T1 section (810) and the T3 section (830), the base station can transmit a downlink signal based on a predefined transmission power 1 or M1 transmission antennas (801). On the other hand, in the base station power saving state, in the T2 section (820), the base station can transmit a downlink signal based on a transmission power 2 that is smaller than the transmission power 1 or M2 transmission antennas (802) that are relatively smaller than the M1 transmission antennas (801), thereby stopping or minimizing the operation of the base station power amplifier, base station RF device, and / or baseband device, and saving base station energy.

[0208] - Base Station Energy Saving Method 4: In an environment where carrier bundles are applied, when the amount of traffic to be transmitted by the base station is maintained below a threshold, the base station can transmit the traffic through a predetermined configuration carrier and switch off the remaining configuration carriers. This allows the operation of the power amplifier, RF devices, baseband devices, etc., of the switched-off configuration carriers to be stopped or minimized, thereby saving base station energy. For example, this is explained through Fig. 9.

[0209] - FIG. 9 is a diagram illustrating an example of a base station energy saving method according to an embodiment of the present disclosure. Referring to FIG. 9, configuration carrier 1 (901) and configuration carrier 2 (902) are operated as a carrier bundle. In the example of FIG. 9, the amount of traffic that the base station intends to transmit during the T1 period (910) and the T3 period (930) may be maintained at a level higher than a threshold, and the amount of traffic that the base station intends to transmit during the T2 period (920) may be maintained at a level lower than a threshold. In this case, to save energy, the base station may operate the T2 period in a base station power saving state, switch off configuration carrier 2 (902), and have configuration carrier 1 (901) handle the traffic processing during the T2 period. On the other hand, in the base station normal state T1 (910) and T3 (930) sections, both configuration carrier 1 (901) and configuration carrier 2 (902) are activated to process a relatively large amount of traffic quickly.

[0210] According to one embodiment, base station energy saving methods 1, 2, 3, and 4 can be applied and operated individually, or combined and operated together.

[0211] According to one embodiment, the base station state is represented in two stages: a base station general state and a base station power saving state, but this is merely an example, and the base station power saving state can be distinguished in more detail. For example, in conjunction with the base station energy saving method, the base station power saving state 1 may represent the base station power saving state according to the base station energy saving method 1, the base station power saving state 2 may represent the base station power saving state according to the base station energy saving method 2, the base station power saving state 3 may represent the base station power saving state according to the base station energy saving method 3, and the base station power saving state 4 may represent the base station power saving state according to the base station energy saving method 4.

[0212] Hereinafter, with reference to FIG. 10, the operation of the system proposed in the present disclosure will be described.

[0213] The main point of the present invention is that, even if the base station (1030) is in a base station power saving state, the base station (1030) can transmit a discovery signal (1001) to facilitate base station identification by the terminal (1040). The discovery signal can be transmitted by the base station (1030) to the terminal (1040) to inform it of the presence of a base station or cell. The discovery signal can be a sequence-based signal similar to a synchronization signal and can be composed of a combination of one or more sequences. The discovery signal can be transmitted periodically, and by transmitting it with a relatively long transmission periodicity, a base station power saving effect can be expected during the period when the discovery signal is not transmitted. A terminal that detects the discovery signal can recognize that a cell transmitting the discovery signal exists in the vicinity of the terminal. Accordingly, the terminal (1040) can transmit a terminal request signal (1002) requesting the base station (1030) to transmit a synchronization signal, and the base station can transmit a synchronization signal to the terminal in response to the terminal request. The present invention refers to the synchronization signal that responds to such a terminal request as an on-demand SSB (1003). Through the on-demand SSB, the terminal (1040) can quickly obtain time and frequency synchronization. The on-demand SSB can be composed of a combination of at least some of the PSS, SSS, and PBCH. Based on the transmission of the on-demand SSB, the base station (1030) can switch the base station state from the base station power saving state (1010) to the base station general state (1020) to provide smooth communication services to terminals within the cell. In the base station general state, the base station (1030) can transmit an SSB (1004) in accordance with a predefined transmission cycle, separately from the transmission of the on-demand SSB.That is, since a separate terminal request for SSB transmission is not required, it can be free from errors in the transmission and reception of the terminal request signal. The terminal (1040) can perform downlink time and frequency synchronization from the SSB received from the base station (1030) and obtain a cell identifier (cell ID). The terminal (1040) can obtain PDCCH configuration information through the control information of the PBCH constituting the SSB and receive a PDCCH (1005) for scheduling a PDSCH for SIB transmission using this information. Then, the terminal (1040) can obtain a SIB from the PDSCH (1006) scheduled by the PDCCH. The SIB includes cell-common transmission and reception related control information. The terminal (1040) can transmit a random access preamble (1007) to initiate a random access procedure by referring to the control information of the SIB.

[0214] Regarding the discovery signal, on-demand SSB, SSB, etc., that the base station (1030) transmits to the terminal (1040), the base station (1030) may apply beamforming technology to increase the reach of the radio waves by concentrating the radiated energy of the transmission signal in a predetermined direction in order to secure sufficient coverage with limited base station transmission power. When beamforming technology is applied to a signal, the beam width of the signal becomes relatively narrow, and the radiated energy is concentrated within the narrowed beam width, thereby increasing the reach of the radio waves. Therefore, in order to transmit the signal in all directions from the center of the base station, a beam sweeping operation may be required to transmit the signal to be transmitted by changing the beam direction multiple times. For example, the base station (1030) may transmit the signal to be transmitted in one beam direction at a time of transmission and then apply beam sweeping to transmit it in a total of L beam directions. The base station (1030) may determine whether to actually transmit (on) or not transmit (off) a transmission signal to which beam sweeping is applied with up to L beams as needed. For example, to save base station power, signal transmission in some beam directions may be stopped, or sufficient coverage may be secured by transmitting signals through some of the up to L beams according to the network configuration based on the frequency band. In this situation, it is necessary to clearly define the multiplexing method of physical channels such as PDCCH and PDSCH that the base station (1030) transmits to the terminal (1040). Below, through the description of each specific embodiment, the mapping and multiplexing method of PDCCH and PDSCH transmitted by the base station according to the on / off state of the signal to which beam sweeping is applied will be explained.

[0215] The following initial access procedure may be understood to include at least one of the following: a discovery signal between the terminal (1040) and the base station (1030), a terminal request signal, an on-demand SSB, the transmission and reception of SSB and system information, and a random access procedure between the terminal (1040) and the base station (1030). Subsequently, the terminal (1040) may request an attach to the network, and after the attach procedure is completed, may transmit and receive packets (or data) through the network.

[0216] The present invention may include a plurality of embodiments, each of which may be implemented independently as it is distinguished for convenience to explain the implementation according to the present disclosure; however, as long as they are not mutually exclusive, all or part of the plurality of embodiments may be selectively combined and implemented. Such combinations include various variations and modifications of the present invention and may be made in various ways depending on technical needs or application environments. Even if the plurality of embodiments use different approaches to achieve the purpose of the invention, they may be used simultaneously or complementarily as long as the embodiments of the present invention are not technically mutually exclusive. Such combinations may be varied depending on technical requirements or specific application cases, and the present invention may encompass various embodiments including such variations and combinations. Although the name of a 5G system is used to describe the embodiments of the present disclosure, this is merely an example and can be understood as a message that includes information or performs the same role as described below.

[0217] <1st Embodiment>

[0218] The first embodiment describes a method for mapping and multiplexing a downlink data channel or a downlink control channel when applying on / off to a signal to which the beam sweeping described above is applied.

[0219] FIG. 11 illustrates an example of a mapping pattern for SSBs to which beam sweeping is applied. In the example of FIG. 11, one frame (1110) is composed of two half-frames (1120, 1130), and each half-frame is composed of 10 slots (1140). FIG. 11 illustrates the transmission of a total of L = 8 SSBs by beam sweeping by mapping them within the half-frames. The SSBs are mapped to designated slot and symbol positions within the half-frames. In the example of FIG. 11, SSB#0 (1100) and SSB#1 (1101) are mapped to the first slot within the half-frame, SSB#2 (1102) and SSB#3 (1103) are mapped to the second slot within the half-frame, SSB#4 (1104) and SSB#5 (1105) are mapped to the third slot within the half-frame, and SSB#6 (1106) and SSB#7 (1107) are mapped to the fourth slot within the half-frame. In the notation of SSB#k, the index k represents the beam direction, and k ∈ {0, 1, ..., L-1}, and it is assumed that if the index is different, the beam direction is different. The SSB mapping pattern of FIG. 11 is merely one possible example, and various configurations are possible depending on the subcarrier spacing settings, frequency bands, etc. of the communication system.

[0220] In a system operating with the SSB mapping pattern described above, the base station may determine whether to actually transmit the SSB as needed and either transmit it (on) or not transmit it (off). For example, to save base station power, signal transmission in some beam directions may be stopped, or sufficient coverage may be secured by transmitting signals through some beams out of up to L beams according to the network configuration based on the frequency band. The base station may inform the terminal of the transmission status (on / off) of the SSB through signaling. For example, the signaling may be configured in the form of an L-bit bitmap, where a bit value of '1' indicates that the SSB is being transmitted, and a bit value of '0' indicates that the SSB is not being transmitted. Additionally, it may indicate a one-to-one correspondence between each bit of the bitmap signaling and SSB#k. FIG. 12 illustrates an example of the on / off of SSB transmission.

[0221] - Example 1 (1201): As an example where bitmap signaling is [1 1 1 1 0 0 0 0], it indicates that the base station transmits SSB#0 (1210), SSB#1 (1211), SSB#2 (1212), SSB#3 (1213), and does not transmit SSB#4 (1214), SSB#5 (1215), SSB#6 (1216), SSB#7 (1217).

[0222] - Example 2 (1202): As an example where bitmap signaling is [0 0 1 1 0 0 0 0], it indicates that the base station transmits SSB#2 (1222) and SSB#3 (1223) and does not transmit SSB#0 (1220), SSB#1 (1221), SSB#4 (1224), SSB#5 (1225), SSB#6 (1226), and SSB#7 (1227).

[0223] - Example 3 (1203): As an example where bitmap signaling is [1 1 1 1 1 1 1 0], the base station transmits SSB#0 (1230), SSB#1 (1231), SSB#2 (1232), SSB#3 (1233), SSB#4 (1234), SSB#5 (1235), SSB#6 (1236), and does not transmit SSB#7 (1237).

[0224] Since the transmission status of SSB applies commonly to all terminals within the cell, it may be effective for the base station to transmit a signaling indicating whether SSB is transmitted to the terminals via SIB.

[0225] Hereinafter, with reference to FIG. 13, the operation in the case where the PDCCH and SSB mapping patterns overlap at least partially will be described. FIG. 13 illustrates a situation in which the radio resources of the PDCCH (1320) that the base station intends to transmit to the terminal partially (1330) overlap with the radio resources of SSB#k (1310) that constitute the SSB mapping pattern. In this case, the base station may perform at least one of the following operations. In FIG. 13, the x-axis represents the time domain and the y-axis represents the frequency domain.

[0226] - Operation 1: The base station transmits SSB#k and stops transmitting PDCCH.

[0227] - Operation 2: The base station transmits PDCCH and stops transmitting SSB#k.

[0228] - Operation 3: The base station transmits SSB#k, and the PDCCH maps and transmits to radio resources excluding the area overlapping with SSB#k.

[0229] - Operation 4: The base station transmits PDCCH, and SSB#k is mapped to and transmitted to radio resources excluding the area overlapping with PDCCH.

[0230] - Operation 5: The base station selects one method from operations 1 to 4 above and transmits.

[0231] The above operations may be applied with limitations to some operations depending on whether the base station actually transmits SSB#k. For example, if the base station actually transmits SSB#k, the base station may select Operation 1, Operation 3, or Operation 4 among the above operations. On the other hand, if the base station does not actually transmit SSB#k, the base station may select Operation 2 among the above operations.

[0232] In the case of Operation 3 above, the PDCCH is mapped and transmitted over fewer wireless resources than the original PDCCH intended for transmission, which may result in a deterioration of the terminal's PDCCH reception performance. Accordingly, this may not be a desirable operation in situations where PDCCH reception performance is considered important.

[0233] In the case of Operation 4 above, SSB#k is mapped and transmitted over fewer wireless resources than the original intended wireless resources for SSB#k, which may result in a deterioration of the terminal's SSB#k reception performance. Accordingly, this may not be a desirable operation in situations where SSB#k reception performance is considered important.

[0234] In the case of the above operation 5, the base station can inform the terminal of which operation to apply through signaling.

[0235] The terminal can receive PDCCH and / or SSB#k through terminal receiving operations corresponding to the above operations 1 to 5.

[0236] Additionally, the base station can resolve uncertain terminal behavior by informing the terminal through signaling whether SSB#k is actually transmitted. For example, if the base station decides not to transmit SSB#k and signals the relevant fact to the terminal, the terminal can expect the base station to perform the above-mentioned operation 2.

[0237] As a case similar to the above situation, it is necessary to define the operation in the case where the PDSCH and SSB mapping patterns overlap at least partially. This will be explained below with reference to FIG. 13. FIG. 13 illustrates a situation where the radio resources of PDSCH (1320) that the base station intends to transmit to the terminal partially (1330) overlap with the radio resources of SSB#k (1310) that constitute the SSB mapping pattern. In this case, the base station may perform at least one of the following operations. In FIG. 13, the x-axis represents the time domain and the y-axis represents the frequency domain.

[0238] - Operation A: The base station transmits SSB#k and stops transmitting PDSCH.

[0239] - Operation B: The base station transmits PDSCH and stops transmitting SSB#k.

[0240] - Operation C: The base station transmits SSB#k, and PDSCH transmits by mapping to radio resources excluding the area overlapping with SSB#k.

[0241] - Operation D: The base station transmits PDSCH, and SSB#k is mapped to and transmitted to radio resources excluding the area overlapping with PDSCH.

[0242] - Operation E: The base station selects one method from Operations A to D above and transmits.

[0243] The above operations may be applied by limiting them to some operations depending on whether the base station actually transmits SSB#k. For example, if the base station actually transmits SSB#k, the base station may select operation A, operation C, or operation D among the above operations. On the other hand, if the base station does not actually transmit SSB#k, the base station may select operation B among the above operations.

[0244] In the case of the above operation C, the PDSCH is transmitted by mapping it over fewer wireless resources than the original PDSCH intended to be transmitted, which may result in a deterioration of the terminal's PDSCH reception performance. However, unlike the above PDCCH, the PDSCH can be restored through HARQ retransmission, so it may be a relatively acceptable operation.

[0245] In the case of the above operation D, SSB#k is mapped and transmitted over fewer wireless resources than the original intended wireless resources for SSB#k, which may result in a deterioration of the terminal's SSB#k reception performance. Accordingly, this may not be a desirable operation in situations where SSB#k reception performance is considered important.

[0246] In the case of the above operation E, the base station can inform the terminal of which operation to apply through signaling.

[0247] The terminal can receive PDSCH and / or SSB#k through terminal receiving operations corresponding to the above operations A to E.

[0248] Additionally, the base station can resolve uncertain terminal behavior by informing the terminal through signaling whether SSB#k is actually transmitted. For example, if the base station decides not to transmit SSB#k and signals the relevant fact to the terminal, the terminal can expect the base station to perform the above-mentioned operation B.

[0249] Although the above description was given based on an SSB to which beam sweeping is applied, the operation of the first embodiment is not limited thereto. For example, when beam sweeping is applied to a discovery signal or an on-demand SSB, the operation described above can be applied.

[0250] <Second Embodiment>

[0251] A second embodiment describes another mapping and multiplexing method for a downlink data channel or a downlink control channel when applying on / off to a signal to which the beam sweeping described above is applied.

[0252] With reference to Fig. 14 below, the operation of the base station when the base station transmits PDCCH and SSB will be explained.

[0253] In the example of FIG. 14, when the time for monitoring the terminal's PDCCH arrives at step 1400, the base station may determine at step 1410 whether it has signaled to the terminal whether the aforementioned SSB#k has been actually transmitted. If the base station has not signaled to the terminal whether the SSB#k has been actually transmitted, the base station determines that this is the start stage of the initial connection procedure (e.g., a stage where even SIB transmission has not occurred), and may transmit the PDCCH to the terminal. In this case, the base station assumes that no overlap with the SSB occurs at the time of transmitting the PDCCH. If, at step 1410, the base station determines that it has signaled to the terminal whether the aforementioned SSB#k has been actually transmitted, the base station may determine at step 1430 whether the PDCCH to be transmitted and the SSB#k overlap at least partially. If the PDCCH to be transmitted and the SSB#k overlap at least partially, the base station may stop transmitting the PDCCH at step 1450. In this case, the base station can execute the transmission of SSB#k. That is, the base station can set a high priority for the transmission of SSB#k. If, at step 1430, the PDCCH that the base station intends to transmit does not overlap with SSB#k, then at step 1440, the base station can execute the transmission of PDCCH. In this case, since the radio resources do not overlap with each other, the base station can also execute the transmission of SSB#k.

[0254] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0255] FIG. 15 shows a terminal operation corresponding to the base station operation of FIG. 14.

[0256] In the example of FIG. 15, when the time for PDCCH monitoring arrives at step 1500, the terminal can determine at step 1510 whether it has received a signal from the base station regarding the actual transmission of the aforementioned SSB#k. If the terminal has not received a signal from the base station regarding the actual transmission of SSB#k, the terminal determines that it is the beginning stage of the initial connection procedure (e.g., a stage where even SIB transmission has not occurred), and at step 1520, the terminal can perform PDCCH monitoring. In this case, the terminal assumes that no overlap with the SSB occurs at the time of PDCCH monitoring. If the terminal determines at step 1510 that it has received a signal from the base station regarding the actual transmission of the aforementioned SSB#k, the terminal can determine at step 1530 whether the PDCCH to be received and SSB#k overlap at least partially. If the PDCCH to be received and SSB#k overlap at least partially, the terminal does not need to perform PDCCH monitoring at step 1550. In this case, the terminal can receive SSB#k. That is, the terminal can set a high priority for receiving SSB#k. If, in step 1530, the PDCCH that the terminal wants to receive does not overlap with SSB#k, then in step 1540, the terminal can monitor the PDCCH. In this case, since the wireless resources do not overlap, the terminal can also receive SSB#k.

[0257] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0258] Next, with reference to Fig. 16, the operation of the base station when the base station transmits PDSCH and SSB will be explained.

[0259] In the example of FIG. 16, when the time for PDSCH transmission arrives at step 1600, the base station can determine at step 1610 whether it has signaled to the terminal whether the aforementioned SSB#k has been actually transmitted. If the base station has not signaled to the terminal whether the SSB#k has been actually transmitted, the base station determines that this is the start stage of the initial connection procedure (e.g., a stage where even SIB transmission has not occurred) and can transmit PDSCH to the terminal. In this case, the base station assumes that no overlap with the SSB occurs at the time of PDSCH transmission. If, at step 1610, the base station determines that it has signaled to the terminal whether the aforementioned SSB#k has been actually transmitted, the base station can determine at step 1630 whether the PDSCH to be transmitted and the SSB#k overlap at least partially. If the PDSCH that the base station intends to transmit and SSB#k overlap at least partially, in step 1650 the base station may transmit the PDSCH to the terminal after performing rate matching on the resources that overlap with SSB#k. The PDSCH rate matching refers to the operation of mapping the PDSCH across the remaining radio resources, excluding the resources that overlap with SSB#k from the radio resources scheduled by the base station for PDSCH transmission. In this case, the base station may transmit SSB#k as is. In step 1630 if the PDSCH that the base station intends to transmit and SSB#k do not overlap, the base station may transmit the PDSCH in step 1640. In this case, since the radio resources do not overlap with each other, the base station may also transmit SSB#k.

[0260] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0261] FIG. 17 shows a terminal operation corresponding to the base station operation of FIG. 16.

[0262] In the example of FIG. 17, when the time for PDSCH monitoring arrives at step 1700, the terminal can determine at step 1710 whether it has received a signal from the base station regarding the actual transmission of the aforementioned SSB#k. If the terminal has not received a signal from the base station regarding the actual transmission of SSB#k, the terminal determines that it is the start stage of the initial connection procedure (for example, it can determine that it is a stage where even SIB transmission has not occurred), and can receive the PDSCH at step 1720. In this case, the terminal assumes that no overlap with the SSB occurs at the time of receiving the PDSCH. If the terminal determines at step 1710 that it has received a signal from the base station regarding the actual transmission of the aforementioned SSB#k, the terminal can determine at step 1730 whether the PDSCH to be received and the SSB#k overlap at least partially. If the PDSCH that the terminal intends to receive and SSB#k overlap at least partially, in step 1750 the terminal determines that the PDSCH was transmitted with rate matching and accordingly can execute the PDSCH reception operation. In this case, the terminal can execute the reception of SSB#k as is. In step 1730 if the PDSCH that the terminal intends to receive and SSB#k do not overlap, in step 1740 the terminal can receive the PDSCH. In this case, since the radio resources do not overlap with each other, the terminal can also execute the reception of SSB#k.

[0263] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0264] Although the above description was given based on an SSB to which beam sweeping is applied, the operation of the second embodiment is not limited thereto. For example, when beam sweeping is applied to a discovery signal or an on-demand SSB, the operation described above can be applied.

[0265] <Third Embodiment>

[0266] A third embodiment describes a method for mapping and multiplexing a downlink data channel or a downlink control channel depending on whether the state of the terminal is an idle state or a connected state when applying on / off to a signal to which beam sweeping is applied.

[0267] A specific method of the third embodiment is described below with reference to FIG. 18. In FIG. 18, a base station (1830) transmits a discovery signal (1801). The discovery signal is a cell-common signal and has the characteristic of being transmitted with a relatively long transmission period. Even if the base station (1830) is in a power-saving state, the base station (1830) can notify terminals within the cell coverage of the presence of the base station (1830) by transmitting the discovery signal. A terminal (1840) that has successfully detected the discovery signal can transmit a terminal request signal (1802) to the base station (1830) to request the transmission of an on-demand SSB. The base station (1830) can transmit a response signal (1803) corresponding to the terminal request signal to the terminal (1840) in the form of a PDCCH or PDSCH. The above response signal (1803) indicates that the base station (1830) has successfully received the terminal request signal (1802) and may additionally provide control information related to the on-demand SSB (1804). The terminal that has obtained the above response signal (1803) may perform the operation of receiving the on-demand SSB (1804). In the example of FIG. 18, the step of the base station (1830) and the terminal (1840) transmitting and receiving the discovery signal, terminal request signal, response signal, and on-demand SSB is represented as phase 1 (1810). Subsequently, in phase 2 (1820), the base station (1830) may enable the terminal (1840) to synchronize time and frequency and obtain a cell identifier through the transmission of the SSB (1805). And the terminal (1840) can obtain control information related to the PDCCH (e.g., time and frequency resource information of the PDCCH) for scheduling the SIB to be received in the next step from the MIB obtained through the SSB. Afterwards, the terminal (1840) can obtain the SIB by receiving the PDCCH (1806) and PDSCH (1807).The SIB contains cell-common transmission and reception control information. The terminal (1840) can transmit a random access preamble (1808) by referring to the control information of the SIB. When the terminal (1840) completes the random access procedure, the terminal (1840) switches from an idle state to a connected state, and one-to-one communication can be made between the base station (1830) and the terminal (1840).

[0268] As with the first and second embodiments above, beam sweeping may be applied to the SSB transmission (1805) of FIG. 18. In this case, signaling regarding whether SSB#k is actually transmitted may be included as control information of the SIB and transmitted to the terminal (1840) via PDSCH (1807).

[0269] According to the example of FIG. 18, when the terminal power is turned on, the procedure of receiving the discovery signal (1801) is performed sequentially. And until the PDSCH (1807) carrying the SIB is received, the terminal (1840) is in a state where it cannot know whether SSB#k among the SSB mapping patterns is actually transmitted, so the following operations are performed for the reception of the PDCCH and PDSCH.

[0270] - PDCCH reception operation until SIB reception by idle terminal (1850) (D1, 1851): When monitoring the PDCCH, the terminal proceeds with PDCCH monitoring even if an overlap with the SSB mapping pattern occurs, and assumes that no overlap with the actual transmission of SSB#k occurs (this corresponds to step 1520 of FIG. 15). The response signal (1803) corresponding to the terminal request signal may be the PDCCH that the terminal receives during the D1 (1851) period.

[0271] - PDSCH reception operation until SIB reception by the idle terminal (1850) (D1, 1851): When the terminal receives the PDSCH, it is assumed that the terminal proceeds with PDSCH reception even if an overlap with the SSB mapping pattern occurs, and that no overlap with the actual transmission of SSB#k occurs (this corresponds to step 1720 of FIG. 17). The response signal (1803) corresponding to the terminal request signal may be the PDSCH that the terminal receives during the D1 (1851) period.

[0272] After receiving the PDSCH (1807) carrying the above SIB, the terminal becomes aware of whether SSB#k is actually transmitted among the SSB mapping patterns, so it performs the following operations upon receiving the PDCCH and PDSCH.

[0273] - PDCCH reception operation from the time the idle terminal (1850) receives the SIB until it switches to the connected state (D2, 1852): When the terminal monitors the PDCCH, if an overlap with SSB#k occurs, the terminal does not need to monitor the PDCCH and executes the reception of SSB#k (this corresponds to step 1550 of FIG. 15). When the terminal monitors the PDCCH, if no overlap with SSB#k occurs, the terminal executes the PDCCH monitoring. In this case, since the wireless resources do not overlap with each other, the terminal also executes the reception of SSB#k (this corresponds to step 1540 of FIG. 15). A PDCCH for scheduling message 2 in the random access procedure, or a PDCCH for scheduling message 4, may be the PDCCH that the terminal monitors during the D2 (1852) period.

[0274] - PDSCH reception operation from the time the idle terminal (1850) receives the SIB until it switches to the connected state (D2, 1852): When the terminal receives the PDSCH, if an overlap with SSB#k occurs, the terminal determines that the PDSCH was transmitted with rate matching and executes the PDSCH reception operation accordingly. In this case, the terminal continues to receive SSB#k (this corresponds to step 1750 of FIG. 17). When the terminal receives the PDSCH, if no overlap with SSB#k occurs, the terminal receives the PDSCH. In this case, since the wireless resources do not overlap with each other, the terminal also executes the reception of SSB#k (this corresponds to step 1740 of FIG. 17). A PDSCH carrying message 2 in the random access procedure, or a PDSCH carrying message 4, may be the PDSCH that the terminal receives during the D2 (1852) period.

[0275] Since the connected terminal (1860) can maintain control information regarding whether the SSB#k of the SIB received through the initial connection procedure is actually transmitted, the mapping and multiplexing method of the PDCCH or PDSCH received in the connected state and the SSB#k may be the same as the operation during the D2 (1852) period of the idle terminal described above.

[0276] The connected terminal (1860) obtains cell-common transmission and reception control information from the SIB received through the initial connection procedure. The cell-common transmission and reception control information may include transmission and reception control information for the discovery signal. Beam sweeping may be applied to the discovery signal as well as to the SSB, and accordingly, the mapping pattern of the discovery signal and the signaling for the discovery signal actually transmitted may be included as control information for the SIB. Therefore, it can be assumed that the connected terminal has obtained configuration information for the discovery signal. Although the need to detect the discovery signal is small from the perspective of the connected terminal, the base station needs to periodically transmit the discovery signal to inform other idle terminals within the cell of the existence of the cell. In this case, the mapping or multiplexing method between the PDCCH or PDSCH transmitted to the connected terminal and the discovery signal can be defined as follows.

[0277] - PDCCH reception operation of the connected terminal (1860) (D3, 1861): When the terminal monitors the PDCCH, if an overlap with the discovery signal occurs, there is no need to monitor the PDCCH, and the terminal performs the reception of the discovery signal. When the terminal monitors the PDCCH, if no overlap with the discovery signal occurs, the terminal performs the PDCCH monitoring. In this case, since the wireless resources do not overlap with each other, the terminal also performs the reception of the discovery signal.

[0278] - PDSCH reception operation of the connected terminal (1860) (D3, 1861): When the terminal receives the PDSCH, if overlap occurs with the discovery signal, it determines that the PDSCH has been transmitted with rate matching and executes the PDSCH reception operation accordingly. In this case, the terminal continues to receive the discovery signal. When the terminal receives the PDSCH, if overlap does not occur with the discovery signal, the terminal receives the PDSCH. In this case, since the wireless resources do not overlap with each other, the terminal also executes the reception of the discovery signal.

[0279] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names described above, such as discovery signal, on-demand SSB, SSB, PSS, SSS, PBCH, PDCCH, PDSCH, etc., are merely examples and can be understood as messages that include information or perform the same role as described above.

[0280] <Fourth Embodiment>

[0281] The fourth embodiment describes a specific method for signaling indicating whether the above-described SSB or discovery signal is actually transmitted.

[0282] In the description of the embodiments described above, it was explained that signaling indicating whether an SSB or discovery signal is actually transmitted (hereinafter referred to as rate matching signaling for convenience of explanation) can be included as control information within the SIB. Below, a method is described in which a base station provides rate matching signaling to a terminal at a time earlier than the time of SIB transmission. Through this, the terminal rate mapping operation can be determined early, and the efficiency of wireless resource usage can be increased.

[0283] - Signaling method 1: A base station may transmit a discovery signal to a terminal that includes a rate matching signaling. After the terminal acquires the rate mapping signaling, it may apply the operation during the D2 (1852) period described above.

[0284] - Signaling method 2: The base station may transmit to the terminal a response signal corresponding to the terminal request signal, including rate matching signaling. After the terminal acquires the rate mapping signaling, it may apply the operation during the D2 (1852) period described above.

[0285] Additionally, the base station can support the terminal's neighbor cell measurement operation by notifying the terminal of the rate matching information of the neighbor cell through signaling. For example, a terminal that is notified that the discovery signal for some beam direction of a neighbor cell is not actually transmitted can obtain a terminal power saving effect by not performing discovery signal detection for the beam direction of the neighbor cell.

[0286] Likewise, by enabling base stations to exchange rate matching information of each cell with each other through base station signaling, the rate matching information of neighboring cells can be utilized for base station scheduling operations or setting measurement operations for terminals.

[0287] <5th Embodiment>

[0288] The fifth embodiment describes the operation of a terminal and a base station according to the initial connection procedure of the terminal described above.

[0289] FIG. 19 illustrates an example of terminal operation during an initial connection procedure of a terminal according to an embodiment of the present disclosure. In step 1901, the terminal may attempt to detect a discovery signal transmitted by a base station. If the terminal successfully detects the discovery signal, the terminal recognizes that a cell exists around the terminal, and in step 1902, the terminal may transmit a terminal request signal to request the base station to transmit an on-demand SSB. After transmitting the terminal request signal, the terminal may attempt to receive a response signal corresponding to the terminal request signal in step 1903. Subsequently, in step 1904, the terminal may attempt to receive an on-demand SSB. After receiving the on-demand SSB, the terminal may attempt to receive an SSB in step 1905. The terminal may perform downlink time and frequency synchronization from the SSB received from the base station and obtain a cell identifier (cell ID). In one embodiment, the SSB includes at least one of a synchronization signal and a PBCH. In one embodiment, the terminal may obtain MIB, which is essential system information, in step 1905. In one embodiment, the terminal may receive a PBCH using a cell ID obtained from a synchronization signal and obtain MIB, which is essential system information, from the PBCH. In one embodiment, the MIB may include at least one of CORESET information or PDCCH configuration information, which are time-frequency resources to which the PDCCH is mapped. In step 1906, the terminal may monitor a PDCCH that schedules a SIB by referring to the obtained PDCCH configuration information. The terminal may obtain system information (e.g., SIB) by receiving a PDSCH from the scheduling information of the PDCCH that schedules the SIB.The SIB includes cell-common transmission and reception control information, for example, random access control information, paging control information, common control information for various physical channels, and control information indicating whether an SSB or discovery signal is actually transmitted. In step 1907, the terminal may proceed with a random access procedure. The specific terminal operation in the case where the PDCCH or PDSCH that the terminal intends to receive overlaps with the SSB or discovery signal during the initial connection procedure of the terminal follows the description of the embodiments described above.

[0290] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0291] FIG. 20 is a diagram illustrating an example of base station operation to support a terminal initial connection procedure according to an embodiment of the present disclosure. In step 2001, the base station may transmit a discovery signal to notify terminals within cell coverage of the presence of the base station. In step 2002, the base station may attempt to receive a terminal request signal transmitted by a terminal. In step 2003, the base station that has received the terminal request signal may transmit a response signal corresponding to the terminal request signal. In step 2004, the base station may transmit an on-demand SSB. The base station that has transmitted the on-demand SSB may transmit an SSB in step 2005. In one embodiment, the SSB includes at least one of a synchronization signal and a PBCH. In step 2006, the base station transmits a PDCCH and a PDSCH to transmit an SIB. The SIB includes cell-common transmission and reception control information, for example, random access control information, paging control information, common control information for various physical channels, and control information indicating whether an SSB or discovery signal is actually transmitted. In step 2007, the base station may proceed with a random access procedure based on a terminal request. The specific operation of the base station in the case where the PDCCH or PDSCH that the base station intends to transmit to the terminal overlaps with the SSB or discovery signal during the initial connection procedure of the terminal follows the description of the embodiments described above.

[0292] The steps described above may be modified, omitted, changed in order, or undesired steps may be added to carry out the present invention.

[0293] FIG. 21 is a drawing showing an example of a terminal transceiver in a wireless communication system according to an embodiment of the present disclosure. For convenience of explanation, devices not directly related to the present disclosure may be omitted from illustration and description.

[0294] Referring to FIG. 21, the terminal may be configured to include at least one of a transmitter (2104) composed of an uplink transmission processing block (2101), a multiplexer (2102), and a transmission RF block (2103), a receiver (2108) composed of a downlink reception processing block (2105), a demultiplexer (2106), and a reception RF block (2107), and a control unit (2109). The control unit (2109) can control each of the configuration blocks of the receiver (2108) for receiving a data channel or control channel transmitted by the base station as described above, and each of the configuration blocks of the transmitter (2104) for transmitting an uplink signal.

[0295] In the transmission unit (2104) of the terminal, the uplink transmission processing block (2101) can generate a signal to be transmitted by performing processes such as channel coding and modulation. The signal generated by the uplink transmission processing block (2101) can be multiplexed with other uplink signals by a multiplexer (2102), then processed by a transmission RF block (2103), and then transmitted to a base station.

[0296] The receiving unit (2108) of the terminal can demultiplex a signal received from a base station and distribute it to each downlink receiving processing block. The downlink receiving processing block (2105) can obtain control information or data transmitted by the base station by performing processes such as demodulation and channel decoding on the downlink signal of the base station. The receiving unit (2108) of the terminal can apply the output result of the downlink receiving processing block to the control unit (2109) to support the operation of the control unit (2109).

[0297] FIG. 22 is a block diagram showing an example of the configuration of a terminal according to one embodiment of the present disclosure.

[0298] As illustrated in FIG. 22, the terminal of the present disclosure may include at least one of a processor (2230), a transceiver (2210), or a memory (2220). However, the components of the terminal are not limited to the examples described above. For example, the terminal may include more components or fewer components than the components described above. Furthermore, the processor (2230), the transceiver (2210), and the memory (2220) may be implemented in the form of a single chip. According to one embodiment, the transceiver (2210) of FIG. 22 may include the transceiver (2104) and the receiver (2108) of FIG. 21. Additionally, the processor (2230) of FIG. 22 may include the control unit (2109) of FIG. 21.

[0299] According to one embodiment, the processor (2230) can control a series of processes that allow the terminal to operate according to the embodiments of the present disclosure described above. For example, according to the embodiments of the present disclosure, the components of the terminal can be controlled to perform a transmission and reception method of the terminal depending on whether the discovery signal of the base station or the SSB is actually transmitted. The processor (2230) may include at least one processor, and the processor (2230) can perform a transmission and reception operation of the terminal in a wireless communication system applying the operation of the present disclosure described above by executing a program stored in memory (2220).

[0300] The transceiver (2210) can transmit and receive signals with a base station. The signals transmitted and received with the base station may include control information and data. The transceiver (2210) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely an example of the transceiver (2210), and the components of the transceiver (2210) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (2210) can receive a signal through a wireless channel and output it to a processor (2230), and transmit the signal output from the processor (2230) through a wireless channel.

[0301] According to one embodiment, the memory (2220) may store programs and data necessary for the operation of the terminal. Additionally, the memory (2220) may store control information or data included in signals transmitted and received by the terminal. The memory (2220) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memory (2220). According to one embodiment, the memory (2220) may store a program for performing the transmission and reception operation of the terminal depending on whether the discovery signal or SSB of the base station, which is an embodiment of the present disclosure described above, is actually transmitted.

[0302] FIG. 23 is a block diagram showing an example of the configuration of a base station according to one embodiment of the present disclosure.

[0303] As illustrated in FIG. 23, the base station of the present disclosure may include at least one of a processor (2330), a transceiver (2310), or a memory (2320). However, the components of the base station are not limited to the examples described above. For example, the base station may include more components or fewer components than the components described above. In addition, the processor (2330), the transceiver (2310), and the memory (2320) may be implemented in the form of a single chip.

[0304] The processor (2330) can control a series of processes to enable the base station to operate according to the embodiments of the present disclosure described above. For example, according to the embodiments of the present disclosure, the components of the base station can be controlled to perform a method of scheduling a terminal based on whether the discovery signal or SSB of the base station is actually transmitted. The processor (2330) may include at least one processor, and the processor (2330) can perform a method of scheduling a terminal based on the frequency instruction of the base station of the present disclosure described above by executing a program stored in memory (2320).

[0305] The transceiver (2310) can transmit and receive signals with a terminal. The signals transmitted and received with the terminal may include control information and data. The transceiver (2310) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely an example of the transceiver (2310), and the components of the transceiver (2310) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (2310) can receive a signal through a wireless channel and output it to a processor (2330), and transmit the signal output from the processor (2330) through a wireless channel.

[0306] According to one embodiment, the memory (2320) may store programs and data necessary for the operation of the base station. Additionally, the memory (2320) may store control information or data included in signals transmitted and received by the base station. The memory (2320) may be composed of a storage medium or a combination of storage media such as ROM, RAM, hard disk, CD-ROM, and DVD. Additionally, there may be multiple memory (2320). According to one embodiment, the memory (2320) may store a program for performing a method of scheduling a terminal based on whether the discovery signal or SSB of the base station, which is an embodiment of the present disclosure described above, is actually transmitted.

[0307] In the specific embodiments of the present disclosure described above, the components included in the present disclosure are expressed in a singular or plural form according to the specific embodiments presented. However, the singular or plural expression is selected to suit the situation presented for convenience of explanation, and the present disclosure is not limited to singular or plural components; even if a component is expressed in the plural form, it may be composed of a singular form, and even if a component is expressed in the singular form, it may be composed of a plural form.

[0308] Meanwhile, the present specification and drawings disclose preferred embodiments of the present disclosure. Although specific terms have been used, they are used merely in a general sense to facilitate the explanation of the technical content of the present disclosure and to aid in understanding the invention, and are not intended to limit the scope of the present disclosure. It is obvious to those skilled in the art that, in addition to the embodiments disclosed herein, other variations based on the technical concept of the present disclosure are possible. Furthermore, each of the above embodiments may be combined and operated as needed. For example, the first, second, and third embodiments may be implemented independently, or at least one of the embodiments may be combined and implemented.

[0309] Meanwhile, although specific embodiments have been described in the detailed description of the present disclosure, it is understood that various modifications are possible within the scope of the present disclosure. Therefore, the scope of the present disclosure should not be limited to the described embodiments, but should be defined by the claims set forth below as well as equivalents thereof.

Claims

1. In a method of a terminal in a wireless communication system, The operation of receiving a discovery signal from a base station; An operation of confirming that the base station is present in the vicinity of the terminal based on the discovery signal, and transmitting a terminal request signal to the base station requesting the transmission of a synchronization signal; The operation of receiving an on-demand SSB (synchronization signal block) from the base station corresponding to the above terminal request signal and composed of at least some combination of PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (physical broadcast channel); and The operation includes receiving a plurality of SSBs based on a mapping pattern to which beam sweeping is applied from the base station that has switched from an energy saving state to a normal state based on the transmission of the above-mentioned on-demand SSB, and The above mapping pattern is a method in which a first SSB among the plurality of SSBs is mapped to a first slot in the time domain, and a second SSB among the plurality of SSBs is mapped to a second slot.

2. In Paragraph 1, A method further comprising the operation of performing downlink time and frequency synchronization based on at least one of the plurality of SSBs and obtaining a cell identifier (cell ID).

3. In Paragraph 1, A method further comprising the operation of receiving bitmap information from the base station indicating whether to transmit for each of the plurality of SSBs.

4. In Paragraph 3, An operation to determine whether at least some of the plurality of SSBs based on the above mapping pattern overlap with the PDCCH (physical downlink control channel); An operation to stop monitoring the PDCCH when at least some of the plurality of SSBs overlap with the PDCCH; and A method further comprising an operation to perform monitoring of the PDCCH if at least some of the plurality of SSBs above do not overlap with the PDCCH.

5. In the method of a base station in a wireless communication system, The operation of transmitting a discovery signal to the terminal indicating that the base station is present in the vicinity of the terminal; The operation of receiving a terminal request signal from the terminal requesting the transmission of a synchronization signal based on the above discovery signal; The operation of transmitting an on-demand SSB (synchronization signal block) to the terminal corresponding to the above terminal request signal, the on-demand SSB being composed of at least a combination of PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (physical broadcast channel); and Based on the transmission of the above-mentioned on-demand SSB, the operation includes switching from an energy-saving state to a normal state and transmitting a plurality of SSBs based on a mapping pattern to which beam sweeping is applied to the terminal. The above mapping pattern is a method in which a first SSB among the plurality of SSBs is mapped to a first slot in the time domain, and a second SSB among the plurality of SSBs is mapped to a second slot.

6. In Paragraph 5, A method further comprising the operation of transmitting bitmap information indicating whether to transmit each of the plurality of SSBs to the terminal.

7. In Paragraph 6, A method further comprising the operation of confirming that at least some of the plurality of SSBs based on the above mapping pattern overlap with the PDCCH (physical downlink control channel).

8. In Paragraph 7, The operation of transmitting at least some of the plurality of SSBs above and stopping the transmission of the PDCCH; or An operation to stop transmission for at least some of the plurality of SSBs and perform transmission of the PDCCH; or The operation of transmitting at least some of the plurality of SSBs and transmitting the PDCCH in a wireless resource excluding an area that overlaps with at least some of the plurality of SSBs; or A method comprising the operation of transmitting at least some of the plurality of SSBs in a wireless resource excluding the area overlapping with the above PDCCH, and performing the transmission of the above PDCCH.

9. In a terminal of a wireless communication system, Transmitter / receiver; and It includes a control unit, and the control unit is: Receive a discovery signal from the base station, Based on the discovery signal, confirm that the base station is present in the vicinity of the terminal, and control the transmission of a terminal request signal requesting the transmission of a synchronization signal to the base station. Receiving an on-demand SSB (synchronization signal block) from the base station that corresponds to the above terminal request signal and is composed of at least some combination of PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (physical broadcast channel), and From the base station that has switched from an energy saving state to a normal state based on the transmission of the above-mentioned on-demand SSB, a plurality of SSBs based on a mapping pattern to which beam sweeping is applied are received, The above mapping pattern is a terminal in which a first SSB among the plurality of SSBs is mapped to a first slot in the time domain, and a second SSB among the plurality of SSBs is mapped to a second slot.

10. In paragraph 9, the control unit is, A terminal that performs downlink time and frequency synchronization based on at least one of the plurality of SSBs and obtains a cell identifier (cell ID).

11. In paragraph 9, the control unit is, A terminal receiving bitmap information from the base station indicating whether to transmit for each of the plurality of SSBs.

12. In Clause 11, the control unit is, Check whether at least some of the plurality of SSBs based on the above mapping pattern overlap with the PDCCH (physical downlink control channel), and If at least some of the plurality of SSBs overlap with the PDCCH, monitoring of the PDCCH is stopped, and A terminal that performs monitoring of the PDCCH if at least some of the plurality of SSBs above do not overlap with the PDCCH.

13. In a base station of a wireless communication system, Transmitter / receiver; and It includes a control unit, and the control unit is: Controls the transmission of a discovery signal to the terminal indicating that the base station is present in the vicinity of the terminal, and A terminal request signal requesting the transmission of a synchronization signal based on the above discovery signal is received from the terminal, and Control to transmit an on-demand SSB (synchronization signal block), corresponding to the above terminal request signal and composed of at least some combination of PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (physical broadcast channel), to the terminal. Based on the transmission of the above-mentioned on-demand SSB, the system switches from an energy-saving state to a normal state and controls the transmission of multiple SSBs based on a mapping pattern to which beam sweeping is applied to the terminal. The above mapping pattern is a base station in which a first SSB among the plurality of SSBs is mapped to a first slot in the time domain, and a second SSB among the plurality of SSBs is mapped to a second slot.

14. In Clause 13, the control unit is, A base station that transmits bitmap information indicating whether to transmit each of the plurality of SSBs to the terminal.

15. In paragraph 14, the control unit above, A base station that confirms that at least some of the plurality of SSBs based on the above mapping pattern overlap with the PDCCH (physical downlink control channel).

Images