Method and device for controlling energy state and measuring radio resources in wireless communication system

Abstract

This method performed by a terminal in a wireless communication system may comprise the steps of: receiving, from a base station, first measurement configuration information related to a first measurement state and second measurement configuration information related to a second measurement state; identifying a base station state on the basis of information received from the base station; identifying a terminal measurement state on the basis of the base station state and a terminal state; performing a measurement on the basis of the measurement configuration information corresponding to the terminal measurement state of the first measurement configuration information or the second measurement configuration information; and transmitting, to the base station, a measurement result determined on the basis of the measurement.

Description

Method and device for energy state control and wireless resource measurement of 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 such as beamforming and Massive MIMO to mitigate path loss and increase transmission distance in ultra-high frequency bands, support for various numerologies (such as 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, 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 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 between a base station and a terminal, and a measurement operation of the 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] The present disclosure, for solving the above-mentioned problems, comprises a method performed by a terminal in a wireless communication system, the method comprising: receiving from a base station, first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state; checking the base station state based on the information received from the base station; checking the terminal measurement state based on the base station state and the terminal state; performing a measurement based on the measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information; and transmitting a measurement result determined based on the measurement to the base station.

[0012] In addition, the present disclosure for solving the above-mentioned problems comprises a method performed by a base station in a wireless communication system, the method comprising: transmitting information related to a base station state to a terminal; transmitting first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state to the terminal; and receiving from the terminal a result measured based on measurement setting information corresponding to a terminal measurement state among the first measurement setting information or the second measurement setting information, wherein the terminal measurement state is determined based on the base station state and the terminal state.

[0013] In addition, the present disclosure for solving the above-mentioned problems comprises, in a terminal of a wireless communication system, at least one transceiver; at least one processor connected to the at least one transceiver so as to be able to communicate with the at least one transceiver; and a memory that stores an instruction which is connected to the at least one processor so as to be able to communicate with the at least one processor and is executable individually or in any combination thereof, wherein the terminal receives from a base station first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state, checks the base station state based on the information received from the base station, checks the terminal measurement state based on the base station state and the terminal state, performs a measurement based on the measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information, and transmits the measurement result determined based on the measurement to the base station.

[0014] In addition, the present disclosure for solving the above-mentioned problems relates to a base station in a wireless communication system, comprising: at least one transceiver; at least one processor connected to the at least one transceiver so as to be able to communicate; and

[0015] The system includes a memory that is connected to communicate with at least one processor and is executable individually or in any combination of the at least one processor, wherein the base station transmits information related to a base station state to a terminal, transmits first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state to the terminal, and receives from the terminal a result measured based on measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information, wherein the terminal measurement state is determined based on the base station state and the terminal state.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0020] 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.

[0021] FIG. 4 is a drawing showing an example of a bandwidth portion setting according to one embodiment of the present disclosure.

[0022] FIG. 5 is a diagram showing the interrelationship between frequency bands and coverage according to one embodiment of the present disclosure.

[0023] FIG. 6 is a diagram showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0024] FIG. 7 is a diagram showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0025] FIG. 8 is a diagram showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0026] FIG. 9 is a diagram showing an example of a base station energy saving method according to one embodiment of the present disclosure.

[0027] FIG. 10 is a diagram illustrating a signaling method and a terminal procedure according to one embodiment of the present disclosure.

[0028] FIG. 11 is a diagram illustrating a signaling method and a terminal procedure according to one embodiment of the present disclosure.

[0029] FIG. 12 is a diagram illustrating a terminal measurement method according to one embodiment of the present disclosure.

[0030] FIG. 13 is a drawing showing a terminal transceiver device according to one embodiment of the present disclosure.

[0031] FIG. 14 is a block diagram illustrating the structure of a terminal according to one embodiment of the present disclosure.

[0032] FIG. 15 is a block diagram illustrating the structure of a base station according to one embodiment of the present disclosure.

[0033] Hereinafter, embodiments of the present disclosure will be described in detail 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 might 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 conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0034] 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.

[0035] At this point, it will be understood that each block of the process flow diagrams and combinations of the flow diagrams can be executed by computer program instructions. Since these computer program instructions can be loaded into the processor of a general-purpose computer, a special-purpose computer, or other programmable data processing equipment, the instructions executed through the processor of the computer or other programmable data processing equipment create means to perform the functions described in the flow diagram block(s). Since these computer program instructions can also be stored in computer-available or computer-readable memory that can be directed toward the computer or other programmable data processing equipment to implement the function in a specific way, the instructions stored in computer-available or computer-readable memory can also produce a manufactured item containing instruction means to perform the function described in the flow diagram block(s). Since computer program instructions can be loaded onto a computer or other programmable data processing equipment, instructions that perform a series of operation steps on the computer or other programmable data processing equipment to create a process executed by the computer can also provide steps for executing the functions described in the flowchart block(s).

[0036] Additionally, each block may represent a module, segment, or part of code containing one or more executable instructions for executing a specific logical function(s). It should also be noted that in some alternative execution examples, the functions mentioned in the blocks may occur out of order. For example, two blocks described in succession may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order according to their corresponding functions.

[0037] In this embodiment, the term "part" refers to a software or hardware component such as an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit), and the "part" performs certain roles. However, the meaning of "part" is not limited to software or hardware. The "part" may be configured to reside in an addressable storage medium or configured to run one or more processors. Thus, as an example, the "part" includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functions provided within the components and "parts" may be combined into a smaller number of components and "parts" or further separated into additional components and "parts." In addition, the components and 'parts' may be implemented to utilize one or more CPUs within the device or secure multimedia card. Also, in the embodiments, 'parts' may include one or more processors.

[0038] 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 components in any other aspect (e.g., importance or order).

[0039] 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.

[0040] 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.

[0041] 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."

[0042] In the present disclosure, upper layer signaling refers 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 can 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).

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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 aim to provide ultra-high-speed data services reaching several Gbps by utilizing significantly wider ultra-wide bandwidths. Accordingly, 5G systems are considering ultra-high frequency bands ranging from several GHz to up to 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.

[0047] 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.

[0048] To overcome the disadvantage of reduced coverage in the ultra-high frequency band, beamforming technology can be applied. This technology uses multiple antennas to concentrate radio wave radiated energy toward a specific target point, thereby increasing the reach of the radio waves. In other words, a signal to which beamforming technology is applied has a relatively narrower beam width, and as radiated energy is concentrated within this narrowed beam width, the reach of the radio waves increases. Beamforming technology can be applied to both the transmitting and receiving ends. In addition to the effect of increasing coverage, beamforming technology also has the effect of reducing interference in areas outside the beamforming direction. For beamforming technology to operate properly, accurate measurement and feedback methods for the transmit and receive beams are required. Beamforming technology can be applied to control channels or data channels that correspond one-to-one between a specific terminal and a base station. Furthermore, beamforming technology can be applied to control channels and data channels used to transmit common signals—such as synchronization signals, physical broadcast channels (PBCH), and system information—that a base station transmits to multiple terminals within the system, in order to increase coverage. When applying beamforming technology to a common signal, 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.

[0049] 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.

[0050] FIG. 1 is a diagram showing the basic structure of a time-frequency resource domain of a 5G system according to one embodiment of the present disclosure. That is, FIG. 1 is a diagram showing the basic structure of a time-frequency resource domain, which is a wireless resource domain where data or control channels of a 5G system are transmitted.

[0051] 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 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 BWIt can be composed of several subcarriers (104).

[0052] In the time-frequency domain, the basic unit of a resource is a resource element (RE) (112), which can be represented by an OFDM symbol index and a subcarrier index. A resource block (RB or Physical Resource Block, PRB) is 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.

[0053] In a 5G system, base stations map data in RB units and can generally perform scheduling on RBs that constitute a 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.

[0054] OFDM symbol count It is 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.

[0055] 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.

[0056] From the perspective of the operating frequency band, a larger subcarrier spacing is advantageous for recovering phase noise in the high-frequency band.

[0057] - 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 is advantageous for supporting ultra-low latency services such as URLLC.

[0058] - 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 is a concept referring to the area covered by a single base station.

[0059] Subcarrier spacing and CP length are essential information for OFDM transmission and reception; therefore, smooth transmission and reception are possible only when the base station and the terminal recognize these values ​​as common. shows the subcarrier spacing configuration (μ) and subcarrier spacing ( It shows an example of the relationship between ), CP lengths.

[0060] [Table 1]

[0061]

[0062] shows the number of symbols per slot for each subcarrier spacing setting (μ) in the case of the general type CP ( ), number of slots per frame( ), and number of slots per subframe( Represents an example of ).

[0063] [Table 2]

[0064]

[0065] 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 ).

[0066] [Table 3]

[0067]

[0068] 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, existing LTE / LTE-A systems can provide stable system operation to terminals, while 5G systems can perform the role of providing enhanced services to terminals. Therefore, the frame structure of a 5G system needs to include at least the frame structure of LTE / LTE-A or a set of essential parameters (subcarrier spacing = 15 kHz).

[0069] 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), compared to frame structure A, frame structure B shows that the subcarrier spacing and RB size are doubled, while the slot length and symbol length are doubled. In the case of frame structure B, two slots can form one subframe, and 20 subframes can form one frame.

[0070] 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 slot length, have an integer multiple relationship with each other for each frame structure. Additionally, a subframe of fixed length of 1ms can be defined to represent a reference time unit independent of the frame structure.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] In the initial access phase, when the terminal first connects to the system, the terminal can synchronize downlink time and frequency from the synchronization signal transmitted by the base station through 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 one of the following information.

[0075]

[0076] 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.

[0077] Additionally, the terminal can receive system information transmitted by the base station and obtain cell-common transmission and reception related control information. The cell-common transmission and reception related control information may include at least one of random access related control information, paging related control information, and 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). The control information may be configuration information for each channel or signal. The system information may be referred to, for example, as SIB1 or RMSI (remaining minimum system information).

[0078] 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 data channels or control channels, 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 PSS (primary synchronization signal), SSS (secondary synchronization signal), and PBCH (Physical broadcast channel) can be referred to as an SS / PBCH block or SSB.

[0079] In addition to the initial connection procedure described above, 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.

[0080] After the terminal obtains MIB and system information from the base station through the initial access procedure, the terminal may perform a random access procedure to transition the link with the base station to a connected state (connected state or RRC_CONNECTED state). Upon 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 random access procedure will be described in detail below with reference to FIG. 2.

[0081] FIG. 2 is a diagram illustrating a random access procedure according to one embodiment of the present disclosure.

[0082] 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.

[0083] In the second step (220), the base station may transmit a message to the terminal containing an uplink transmission timing control command based on the 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 the downlink control channel and receive the message over the 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.

[0084] If the terminal does not receive message 2, which is scheduling information for message 3, from the base station within a predetermined time during 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 by the base station by increasing the transmission power of the random access preamble by a predetermined step (power ramping).

[0085] 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.

[0086] In step 4 (240), if the base station determines 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. Then, the terminal may transmit HARQ-ACK information indicating successful reception of message 4 to the base station through the Physical Uplink Control Channel (PUCCH).

[0087] 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).

[0088] The four-step random access procedure described above 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.

[0089] 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 based on the UE capability information of the terminal. Through the UE capability information, the terminal can inform the base station of whether it supports a specific function and / or the maximum allowable value of the function supported by the terminal. Therefore, the UE capability information reported by each terminal to the base station may be different for each terminal.

[0090] 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.

[0091] - Control information related to frequency bands supported by the terminal

[0092] - Control information related to channel bandwidth supported by the terminal

[0093] - Control information regarding the maximum modulation scheme supported by the terminal

[0094] - Control information regarding the maximum number of beams supported by the terminal

[0095] - Control information regarding the maximum number of layers supported by the terminal

[0096] - Control information related to CSI reporting supported by the terminal

[0097] - Control information on whether the terminal supports frequency hopping

[0098] - Bandwidth-related control information when Carrier Aggregation (CA) is supported

[0099] - Control information on whether cross-carrier scheduling is supported when carrier bundling is supported

[0100] 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.

[0101] 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.

[0102] Next, the Bandwidth Part (BWP) setting in the 5G communication system will be explained in detail with reference to the drawing.

[0103] Figure 4 is a diagram illustrating an example of a bandwidth portion setting in a 5G communication system.

[0104] 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 below for each bandwidth portion.

[0105] [Table 4]

[0106]

[0107] 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 upper-layer signaling, for example, RRC 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).

[0108] According to one embodiment, prior to the RRC connection, the terminal may receive an Initial Bandwidth Part (Initial BWP) for initial connection from the base station via the MIB. More specifically, 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 PDCCH (physical downlink control channel) for receiving system information required for initial connection can be transmitted. The control resource set and the 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 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.

[0109] The settings for the bandwidth portion supported by the above 5G can be used for various purposes.

[0110] 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 receive data at a specific frequency position within the system bandwidth.

[0111] In addition, 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.

[0112] In addition, according to one embodiment, for the purpose of reducing 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. In particular, 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 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 receive data using the 100 MHz bandwidth portion according to the instructions of the base station.

[0113] In the method for configuring the above 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. More specifically, the terminal can receive a control area (i.e., CORESET) for a downlink control channel through which a DCI for scheduling SIBs can be transmitted from the MIB of the PBCH. The bandwidth of the control area configured based on the MIB can be considered as the Initial Bandwidth Part, and through the configured Initial Bandwidth Part, the terminal can receive the PDSCH through which SIBs are transmitted. In addition to receiving SIBs, the Initial Bandwidth Part may also be utilized for paging or random access.

[0114] Next, we will explain Downlink Control Information (DCI) in 5G systems in detail.

[0115] In a 5G system, scheduling information for uplink data (or physical uplink data channel (PUSCH)) or scheduling information for downlink data (or physical downlink data channel (PDSCH)) can be transmitted from a base station to a terminal via DCI. The terminal can monitor the DCI format for fallback and the DCI format for non-fallback 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.

[0116] DCI can be transmitted via the 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, such as terminal-specific (UE-specific) data transmission, power control commands, or random access responses. In other words, the RNTI may not be transmitted explicitly but may be included in the CRC calculation process. Upon receiving a DCI message transmitted via the PDCCH, the terminal checks the CRC using the assigned RNTI; if the CRC check result is correct, the terminal knows that the message has been transmitted to it.

[0117] 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 an 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).

[0118] A base station may operate by applying a predetermined DCI format to a terminal to be scheduled, depending on whether the DCI is for downlink assignment, uplink grant, or other purposes other than data scheduling, such as power control.

[0119] The base station can transmit downlink data to the terminal via the 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.

[0120] The terminal can transmit uplink data to the base station via the PUSCH, which is a physical channel for uplink data transmission. 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 the DCI related to uplink data scheduling information among the DCIs transmitted via the PDCCH.

[0121] The time-frequency resource to which the PDCCH is mapped is called a Control Resource Set (CORESET). In the frequency domain, a CORESET can be set on all or part of the frequency resources within the bandwidth supported by the terminal. In the time domain, it can be set on one or more OFDM symbols, which can be defined as the CORESET Length (Control Resource Set Duration). A base station can set one or more CORESETs to the terminal through higher-layer signaling (e.g., System Information, MIB, 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 a CORESET may include at least some of the information included in .

[0122] [Table 5]

[0123]

[0124] CORESET in the frequency domain It can be composed of RBs, and in the time domain It can be composed of 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.

[0125] Interleaved and non-interleaved methods may be supported as transmission methods for PDCCH. The base station may configure 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 configured by the base station, the terminal may determine the CCE-to-REG mapping method in the corresponding CORESET in the manner shown in below.

[0126] [Table 6]

[0127]

[0128] The base station can inform the terminal of configuration information, such as which symbol the PDCCH is mapped to within the slot and the transmission period, through signaling.

[0129] The search space of a PDCCH is described as follows. The number of CCEs required to transmit a PDCCH can be 1, 2, 4, 8, or 16 depending on the aggregation level (AL), and different numbers of CCEs can be used for link adaptation of the downlink control channel. For example, when AL=L, one downlink control channel can be transmitted through L CCEs. The terminal performs blind decoding to detect signals without knowing information about the downlink control channel; to this end, a search space representing a set of CCEs can 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. Since there are various aggregation levels that form a group 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.

[0130] Search spaces can be classified into a common search space (CSS) and a UE-specific search space (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 (SIB). 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 pre-agreed set of CCEs. Scheduling allocation information for the terminal-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.

[0131] The base station may set configuration information for the search space of the PDCCH to the 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 the PDCCH may include at least one of the information shown in below.

[0132] [Table 7]

[0133]

[0134]

[0135]

[0136] According to the configuration information, the base station may set one or more sets of search spaces for the terminal. According to one embodiment, the base station may set search space set 1 and search space set 2 for the 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.

[0137] According to the 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.

[0138] In a common 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.

[0139] - 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

[0140] - DCI format 2_0 with CRC scrambled by SFI-RNTI

[0141] - DCI format 2_1 with CRC scrambled by INT-RNTI

[0142] - DCI format 2_2 with CRC scrambled by TPC-PUSCH-RNTI, TPC-PUCCH-RNTI

[0143] - DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI

[0144] 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.

[0145] - DCI format 0_0 / 1_0 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0146] - DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI, CS-RNTI, TC-RNTI

[0147] RNTIs may follow at least one of the following definitions and uses.

[0148] C-RNTI (Cell RNTI): Used for terminal-specific PDSCH or PUSCH scheduling

[0149] TC-RNTI (Temporary Cell RNTI): Used for terminal-specific PDSCH scheduling

[0150] CS-RNTI (Configured Scheduling RNTI): Used for semi-static terminal-specific PDSCH scheduling.

[0151] RA-RNTI (Random Access RNTI): Used for PDSCH scheduling during the random access phase

[0152] P-RNTI (Paging RNTI): Used for PDSCH scheduling where paging is transmitted.

[0153] SI-RNTI (System Information RNTI): Used for PDSCH scheduling where system information is transmitted.

[0154] INT-RNTI (Interruption RNTI): Used to indicate whether PDSCH has been punctured.

[0155] TPC-PUSCH-RNTI (Transmit Power Control for PUSCH RNTI): Used to instruct power control commands to the PUSCH

[0156] TPC-PUCCH-RNTI (Transmit Power Control for PUCCH RNTI): Used to instruct power control commands to the PUCCH

[0157] TPC-SRS-RNTI (Transmit Power Control for SRS RNTI): Used to instruct power regulation commands to the SRS

[0158] The DCI formats described above may follow the definitions in below.

[0159] [Table 8]

[0160]

[0161] In CORESET p and search space set s, the search space of aggregation level L can be expressed as Equation 1 below.

[0162] [Mathematical Formula 1]

[0163]

[0164] - L: Lamination Level

[0165] - n CI : Carrier Index

[0166] - N CCE,p : Total number of CCEs existing in control resource set p

[0167] - n μ s,f : Slot Index

[0168] - M (L) p,s,max : Number of PDCCH candidates at assembly level L

[0169] - m snCI = 0,..., M (L) p,s,max -1: PDCCH candidate index of aggregation level L

[0170] - i = 0,..., L-1

[0171] -

[0172] - n RNTI : Terminal identifier

[0173] The value may be 0 for the common search space.

[0174] 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 for the terminal by the base station) and the time index.

[0175] The following describes in detail how a terminal measures channel conditions in a 5G communication system and reports them to a base station.

[0176] Channel state information (CSI) may include at least one of the following information.

[0177] - 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.

[0178] - Precoding Matrix Indicator (PMI): Precoding matrix indicator information selected by the terminal

[0179] - CRI (CSI-RS resource indicator): CSI-RS information measured by the terminal

[0180] - RI (Rank Indicator): Rank indicator information selected by the terminal

[0181] - LI (Layer indicator): Indicator information for the best layer among the precoding matrices reported by the terminal

[0182] - SSBRI (SS / PBCH block resource indicator): SSB information measured by the terminal

[0183] - L1-RSRP (Reference Signal Received Power): L1 RSRP information measured by the terminal

[0184] The base station can control at least one of the time and frequency resources for the aforementioned CSI measurement and reporting of the terminal.

[0185] For CSI measurement and reporting operations, 'Aperiodic', 'Semi-Persistent', and 'Periodic' methods are supported, and the base station can configure which method to use for the terminal via signaling. Semi-persistent CSI reporting methods may support 'Semi-PersistentOnPUCCH' and 'Semi-PersistentOnPUSCH'. In the case of periodic or semi-persistent CSI reporting methods, the terminal can receive the PUCCH or PUSCH resources to transmit the CSI from the base station via upper-layer signaling. The period and slot offset of the PUCCH or PUSCH resources to transmit the CSI can 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.

[0186] Non-periodic CSI reporting by the terminal can utilize PUSCH, and periodic CSI reporting can utilize PUCCH. Additionally, semi-permanent CSI reporting can be performed using PUSCH when triggered or activated by DCI, and using PUCCH after being activated by a MAC control element (MAC CE).

[0187] Non-periodic CSI reporting can be triggered by the "CSI request" field of the aforementioned DCI format 0_1, which corresponds to the scheduling DCI for PUSCH.

[0188] 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. Carrier aggregation technology enables ultra-high-speed data services by combining individual component carriers with relatively small bandwidths to increase the total frequency bandwidth when a mobile operator has not secured a frequency bandwidth sufficient for providing ultra-high-speed data services through a single component carrier.

[0189] As described above, the frequency bands utilized by 5G systems range from hundreds of MHz to tens of GHz. Figure 5 illustrates the interrelationships between frequency band, coverage, and bandwidth.

[0190] Figure 5 illustrates 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 the low frequency band, frequencies available for mobile communication are fragmented, resulting in a small bandwidth, whereas in the high frequency band, it is relatively easy to secure wide bandwidth frequencies, making it 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.

[0191] Generally, mobile carriers can secure multiple frequency bands to provide mobile communication services to users. For example, a mobile carrier can operate a combined LTE and 5G system by combining existing frequency bands for LTE systems with newly secured frequency bands for 5G systems. As another example, a mobile carrier 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.

[0192] 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.

[0193] As another measure to support ultra-high-speed data services, data rates can be increased through spatial multiplexing using multiple transmitting and receiving antennas. Generally, the number of required power amplifiers (PAs) increases in proportion to the number of transmitting antennas equipped in a 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 a base station varies depending on the cell size it covers. Maximum output is usually expressed in dBm units. The maximum output of a terminal is typically 23 dBm or 26 dBm.

[0194] As an example of a commercial 5G base station, it is equipped with 64 transmitting antennas and a corresponding 64 power amplifiers in the 3.5GHz frequency band and can operate at a bandwidth of 100MHz. Consequently, the energy consumption of the base station increases in proportion to the output of the power amplifiers and their operating time. Compared to LTE base stations, 5G base stations are characterized by a relatively higher operating frequency band, requiring a wider bandwidth and a larger number of transmitting antennas. While this characteristic has the effect of increasing data rates, it incurs the cost of higher base station energy consumption. Therefore, the more base stations that constitute a mobile communication network, the greater the energy consumption of the entire network becomes in proportion to that number.

[0195] As mentioned above, the energy consumption of a base station is largely determined by the operation of the power amplifier. Since the power amplifier is involved in the base station's transmission operation, the base station's downlink (DL) transmission operation is highly correlated with the base station's energy consumption. Relatively speaking, the base station's uplink (UL) reception operation does not account for a large portion of the base station's energy consumption. The physical channel and physical signal transmitted by the base station over the downlink are as follows.

[0196] - PDSCH: Downlink data channel containing data to be transmitted to one or more terminals

[0197] - PDCCH: A downlink control channel containing scheduling information for PDSCH and PUSCH. Alternatively, PDCCH alone can transmit control information such as slot formats and power control commands without PDSCH or PUSCH to be scheduled. The scheduling information includes resource information mapped to PDSCH or PUSCH, HARQ-related information, power control information, etc.

[0198] - PBCH: A downlink broadcast channel that provides MIB, which is essential system information required for the transmission and reception of the terminal's data and control channels.

[0199] - PSS: Provides some cell ID information as a reference signal for DL ​​time / frequency synchronization.

[0200] - SSS: 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.

[0201] - DM-RS (Demodulation Reference Signal): A reference signal for terminal channel estimation for each of PDSCH, PDCCH, and PBCH.

[0202] - CSI-RS (Channel-state Information Reference Signal): A downlink signal that serves as a reference for measuring the downlink channel state of a terminal.

[0203] - PT-RS (Phase-tracking Reference Signal): Downlink signal for phase tracking

[0204] From the perspective of base station energy conservation, stopping downlink transmission operations can enhance energy savings by halting power amplifier operation. Additional energy savings are possible as the operation of other base station devices, such as baseband units, is also reduced. Similarly, even though uplink reception accounts for a relatively small portion of the base station's total energy consumption, suspending uplink reception can yield additional energy savings.

[0205] Various methods for saving base station energy will be explained below with reference to FIGS. 6, 7, 8, and 9.

[0206] - Base Station Energy Saving Method 1: The downlink transmission operation of a base station depends 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. Alternatively, if transmission can be temporarily deferred for reasons such as the data not being sensitive to transmission delay, the base station may not transmit PDSCH or / and PDCCH. This is illustrated, for example, through Fig. 6.

[0207] FIG. 6 is a drawing illustrating an example of a base station energy saving method according to one embodiment of the present disclosure.

[0208] Referring to FIG. 6, the amount of traffic that the base station intends to transmit may be maintained at a level higher than a threshold value 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 level lower than a threshold value during the T2 period (620). At this time, the base station may stop or minimize the operation of the base station power amplifier, base station RF device, baseband device, etc., by not transmitting the PDSCH for data transmission and the PDCCH for scheduling the PDSCH during the T2 period, thereby saving base station energy. 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, during the T1 and T3 periods, the PDSCH (602) for data transmission and the PDCCH (601) for scheduling the PDSCH are transmitted without restriction, so that there is no hindrance to the provision of communication services by the base station. The base station state in the above T1 and T3 intervals is referred to as the base station normal state, and the base station state in the above T2 interval is referred to as the base station energy saving state (ES state). The threshold value for the amount of traffic may be communicated to the base station by a higher-level entity controlling base station operations through signaling, or the base station may determine it on its own.

[0209] - Base Station Energy Saving Method 2: Physical channels and physical signals such as PSS, SSS, PBCH, and CSI-RS are characterized by being transmitted repeatedly at a predetermined interval, 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 radio link quality. In other words, PSS, SSS, PBCH, and CSI-RS are necessarily transmitted via the downlink regardless of downlink data traffic, thereby causing base station energy consumption. Therefore, base station energy can be saved by controlling the transmission of signals unrelated to (or with low relevance to) data traffic to occur less frequently. This is illustrated with an example using Figure 7.

[0210] FIG. 7 is a drawing illustrating an example of a base station energy saving method according to one embodiment of the present disclosure.

[0211] 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, 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.

[0212] - Base Station Energy Saving Method 3: The base station can reduce energy consumption by switching off part of the base station's antenna or power amplifier. This is illustrated, for example, through Fig. 8.

[0213] FIG. 8 is a drawing illustrating an example of a base station energy saving method according to one embodiment of the present disclosure.

[0214] Referring to FIG. 8, in the T1 (810) and T3 (830) sections, which are the base station normal state, the base station transmits a downlink signal based on a predefined transmission power of 1 or M1 transmission antennas (801). On the other hand, in the T2 (820) section, which is the base station power saving state, the base station transmits a downlink signal based on a transmission power of 2, which is smaller than the transmission power of 1, or M2 transmission antennas (802), which are fewer than the M1 transmission antennas (801), thereby stopping or minimizing the operation of the base station power amplifier, base station RF device, baseband device, etc., and saving base station energy.

[0215] - 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 value, the base station transmits the traffic through a designated configuration carrier and switches 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.

[0216] FIG. 9 is a drawing illustrating an example of a base station energy saving method according to one embodiment of the present disclosure.

[0217] 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 kept high above a threshold value, and the amount of traffic that the base station intends to transmit may be kept low below a threshold value during the T2 period (920). 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, during the T1 period (910) and the T3 period (930), which are the base station normal state, both configuration carrier 1 (901) and configuration carrier 2 (902) are activated to quickly process a relatively large amount of traffic.

[0218] The above-described base station energy saving methods 1, 2, 3, and 4 can be applied and operated individually, or combined and operated together.

[0219] In the above description, the base station state is described in two stages: the base station general state and the base station power saving state; however, the base station power saving state can be distinguished and described in more detail. For example, the base station power saving state can be linked with the base station energy saving method, so that base station power saving state 1 represents the base station power saving state according to the base station energy saving method 1, base station power saving state 2 represents the base station power saving state according to the base station energy saving method 2, base station power saving state 3 represents the base station power saving state according to the base station energy saving method 3, and base station power saving state 4 represents the base station power saving state according to the base station energy saving method 4.

[0220] The operation of the system proposed in the present disclosure is explained below through specific embodiments.

[0221] The main gist of the present invention is that, when applying the base station energy saving method, the base station informs the terminal of the base station power saving status and defines operations related to the terminal and the base station accordingly. Additionally, a measurement state reflecting the base station power saving status, the terminal power saving status, and the terminal's RRC status is defined, and operations related to the terminal and the base station are defined accordingly. The initial access procedure described below may be understood to include at least one of the transmission and reception of synchronization signals and system information between the terminal and the base station, and a random access procedure between the terminal and the base station. Subsequently, the terminal may request to attach to the network, and after the attachment procedure is completed, the terminal may transmit and receive packets (or data) through the network.

[0222] The following is a description of each specific embodiment. The present invention may include a plurality of embodiments, each of which is distinguished for convenience to explain the implementation according to the present disclosure and may be implemented independently; 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.

[0223] <1st Embodiment>

[0224] In the first embodiment, when the above-described base station energy saving method is applied, the base station informs the terminal of the base station power saving status and explains the terminal and base station-related operations accordingly.

[0225] The signaling method for a base station to inform a terminal whether the base station status is in a power saving state or a normal state is as follows.

[0226] - Signaling Method 1: A base station may signal the base station status to a terminal by utilizing a synchronization signal, such as PSS or SSS. For example, the PSS or SSS sequence transmitted by the base station when it is in a base station power saving state (hereinafter referred to as Sequence 1 for convenience of explanation) and the PSS or SSS sequence transmitted by the base station when it is in a base station normal state (hereinafter referred to as Sequence 2 for convenience of explanation) may be different. Sequence 1 and Sequence 2 may be generated by applying methods such as varying sequence initialization conditions according to the base station status, varying wireless resource mapping methods according to the base station status, or varying input values ​​for sequence generation according to the base station status. A method for determining the sequence of synchronization signals according to the state of the base station (or a method for determining the sequence of synchronization signals for the base station power saving state and the sequence of synchronization signals for the base station normal state) may be agreed upon in advance between the base station and the terminal, and they may have the same understanding. Since the terminal cannot know the state of the base station before detecting the above sequence, the terminal attempts to detect the sequence according to the aforementioned agreed method, assuming that the base station state is in a power saving state; if the sequence detection is successful, the terminal can confirm that the base station is in a power saving state. If the sequence detection fails, the terminal attempts to detect the sequence according to the aforementioned agreed method, assuming that the base station state is in a normal state; if the sequence detection is successful, the terminal can confirm that the base station is in a normal state. The sequence detection order of the terminal is provided as an example and is not restricted by the detection order.

[0227] - Signaling Method 2: The base station may add base station status information to the DM-RS of the PBCH and transmit it to the terminal. For example, depending on the base station status, the initialization conditions of the PBCH DM-RS may be different, the radio resource mapping method of the PBCH DM-RS may be different, the input values ​​for generating the PBCH DM-RS may be different, or the OCC (orthogonal cover code) applied to the PBCH DM-RS may be different. The method of adding the base station status information to the DM-RS of the PBCH may be agreed upon in advance between the base station and the terminal, or may be set by the base station. Therefore, the terminal can check the base station status information based on the above PBCH DM-RS.

[0228] - Signaling method 3: The base station can signal to the terminal by including base station status information as control information in the PBCH. Accordingly, the terminal can check the base station status information based on the control information obtained by decoding the PBCH.

[0229] - Signaling Method 4: The base station may notify the terminal by including base station status information as control information in the system information. The control information may explicitly indicate whether the base station is in a base station power saving state or a base station normal state. For example, the control information may include information indicating whether the base station is in a base station power saving state or a base station normal state. Alternatively, the configuration information included in the control information may be divided into specific configuration information for the case of a base station power saving state and specific configuration information for the case of a base station normal state, and the terminal can check the status of the base station based on the configuration information included in the control information. For example, if the control information is set so that the transmission cycle of the SSB is greater than a predetermined threshold value or the transmission power of the SSB is set so that it is less than a predetermined threshold value, it indicates that the base station is in a power saving state; conversely, if the control information is set so that the transmission cycle of the SSB is less than a predetermined threshold value or the transmission power of the SSB is set so that it is greater than a predetermined threshold value, it indicates that the base station is in a normal state. Therefore, the terminal can check the base station status information based on the control information obtained by decoding the system information.

[0230] - Signaling Method 5: A base station may notify a terminal by including base station status information in a DCI. The DCI may be a scheduling DCI for scheduling data from the terminal, or a DCI for group common signaling. For example, the base station may indicate the base station status to the terminal by including additional information indicating base station status information in the scheduling DCI or the group common DCI. Alternatively, if it is a group common DCI, the DCI may be scrambled using a dedicated RNTI to identify that it is a DCI representing base station status information. Thus, the terminal can check the base station status information based on the control information obtained from the DCI.

[0231] - Signaling Method 6: The base station may include base station status information in MAC signaling to notify the terminal. For example, additional bits indicating base station status information may be included in the MAC CE, a new MAC CE format may be defined, or reserved bits from an existing MAC CE may be utilized. Accordingly, the terminal can check the base station status information based on control information obtained from the MAC signaling.

[0232] - Signaling method 7: The base station can include base station status information in the RRC signaling and notify the terminal. Accordingly, the terminal can check the base station status information based on the control information obtained from the RRC signaling.

[0233] For a terminal undergoing an initial connection procedure or a terminal in an idle state, the base station may provide base station status information to the terminal through at least one of the signaling methods 1, 2, 3, and 4. For a terminal in a connected state, the base station may provide base station status information to the terminal through at least one of the signaling methods 5, 6, and 7.

[0234] Referring to FIG. 10 below, the operation of the base station and the terminal according to the signaling method during the initial connection procedure of the terminal is described.

[0235] FIG. 10 is a diagram illustrating a signaling method and a terminal procedure according to one embodiment of the present disclosure.

[0236] When the terminal initiates initial connection, it detects a synchronization signal from the base station to synchronize downlink time and frequency, and can obtain a cell identifier (cell ID). Then, the terminal uses the obtained cell ID to receive the PBCH and can obtain the MIB, which is essential system information, from the PBCH.

[0237] Meanwhile, in accordance with one embodiment of the present disclosure, when signaling method 1 is applied, in which a base station signals the status of the base station to a terminal using a synchronization signal (PSS or SSS), the terminal can check the status of the base station based on the synchronization signal. At this time, if the base station is determined to be in a base station energy saving state, the terminal can determine that it cannot receive smooth communication services from the cell it intends to connect to and perform cell reselection. Meanwhile, if signaling method 1 is not applied, the above process may be omitted.

[0238] In step 1010, the terminal attempts to obtain the MIB by decoding the PBCH. If the terminal fails to decode the PBCH and does not obtain the MIB, it proceeds to step 1060 to perform a cell reselection operation to connect to a different cell other than the cell currently intended for connection.

[0239] Meanwhile, during the process of decoding the PBCH, the terminal can estimate the channel by searching the PBCH DMRS. At this time, if signaling method 2, which transmits base station status information through the PBCH DM-RS according to one embodiment of the present disclosure, is used, the terminal can check the status of the base station based on the PBCH DM-RS. If, as a result of the check, it is confirmed that the base station is in a power saving state, the terminal can perform cell reselection in step 1060. Meanwhile, if signaling method 2 is not applied, the above process may be omitted.

[0240] If the terminal succeeds in acquiring the MIB in step 1010 above, the terminal checks the control information contained in the MIB in step 1020.

[0241] According to one example of the present disclosure, when signaling method 3, in which base station status information is included in the MIB, is applied, the terminal can check the status of the base station based on the base station status information in the MIB. If it is confirmed that the base station is in a power saving state, the terminal determines that it cannot receive smooth communication services from the cell it intends to connect to and proceeds to step 1060 to perform a cell reselection operation to connect to another cell. Meanwhile, if signaling method 3 is not applied, the above process may be omitted.

[0242] The terminal can receive system information at step 1030. As described above, when signaling method 3 is applied, the terminal can receive system information when the state of the base station is the base station general state. However, in this embodiment, when signaling method 3 is not applied, the terminal can receive system information at step 1030 (without checking the state of the base station).

[0243] If the terminal fails to obtain system information, proceed to step 1060 to perform a cell reselection operation to connect to a cell other than the cell currently intended for connection. If the terminal succeeds in obtaining system information in step 1030, check the control information included in the system information in step 1040.

[0244] According to one example of the present disclosure, when signaling method 4, in which base station status information is included in system information, is applied, the terminal can check the status of the base station based on the system information. If the base station status is confirmed to be a base station power saving state, the terminal determines that it cannot receive smooth communication services from the cell it intends to connect to, and proceeds to step 1060 to perform a cell reselection operation to connect to another cell.

[0245] If the base station status information is in the base station general state, the terminal can perform a random access procedure. The terminal that has successfully completed the random access procedure transitions to the connected state (CONNECTED state) in step 1050. In the example of FIG. 10, base station status information is described as being included as control information in both the MIB and SIB, respectively, but this is merely one embodiment of the present disclosure. Base station status information may be included only in the MIB or only in the SIB, and base station status information may be indicated via a synchronization signal or PBCH DM-RS. That is, at least one of signaling methods 1 to 4 may be used.

[0246] Referring to FIG. 11 below, a method in which a terminal in a connected state operates according to the signaling method is described.

[0247] FIG. 11 is a diagram illustrating a signaling method and a terminal procedure according to one embodiment of the present disclosure.

[0248] A connected terminal can check base station status information through at least one of DCI, MAC signaling, and RRC signaling transmitted by the base station.

[0249] The terminal can obtain at least one of DCI, MAC signaling, and RRC signaling in step 1110. The terminal can check base station status information based on the corresponding signaling.

[0250] If the base station status information is in the base station general state, in step 1120, the terminal performs normal transmission and reception operations with the base station according to the base station general state.

[0251] If the base station status information is in a base station power saving state, in step 1130, the terminal performs transmission and reception operations with the base station in accordance with the base station power saving state.

[0252] When the wireless channel environment with the base station deteriorates, the terminal in the connected state may enter the radio link failure stage. In this case, the terminal may have difficulty receiving the DCI, MAC signaling, and RRC signaling. Therefore, the terminal can obtain base station status information through the reception of the PBCH or system information, which is relatively reliable. That is, when the terminal in the connected state enters the radio link failure stage, the terminal can obtain base station status information by applying the procedure of FIG. 10.

[0253] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names PSS, SSS, PBCH, SIB, etc. described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0254] <Second Embodiment>

[0255] A second embodiment defines a measurement state that reflects various states of a base station and a terminal to support a measurement operation of the terminal, and describes operations related to the terminal and the base station accordingly.

[0256] The above measurement state is intended to define the measurement operation of the terminal by reflecting various states of the terminal and the base station, and may be determined by considering at least some of the following items.

[0257] - Base Station Status: As described above, this indicates whether the base station is in a normal state or a base station power saving state.

[0258] - Terminal State 1: Similar to the base station state above, it indicates whether the terminal is in a normal state or a terminal power saving state.

[0259] - Terminal State 2: Indicates whether the terminal is in a connected state capable of performing smooth communication after completing the initial connection procedure with the base station, or whether it has not yet completed the initial connection procedure or is in an idle state after spending a certain amount of time in a connected state.

[0260] Among the states described above, the base station general state, terminal general state, and terminal connection state are states in which both the terminal and the base station are performing or are ready to perform active communication operations, and communication quality above a certain level is maintained by performing terminal measurement operations relatively frequently. In this case, the terminal measurement state is referred to as the general state.

[0261] On the other hand, the base station power saving state, terminal power saving state, and terminal idle state are states in which there is little need for the terminal and the base station to perform general communication operations, and the minimum communication quality is maintained by performing terminal measurement operations relatively intermittently. In this case, the terminal measurement state is referred to as the relaxed state.

[0262] FIG. 12 shows a measurement state of a terminal and a terminal measurement procedure according to a second embodiment of the present disclosure.

[0263] Referring to FIG. 12, the terminal can determine the terminal measurement state by referring to inputs such as base station state (1230), terminal state 1 (1220), and terminal state 2 (1230) as described above (1240). Cases in which the terminal measurement state is determined as a general state may include the following cases.

[0264] - Case 1: Base Station Status = Base Station General Status AND Terminal Status 1 = Terminal General Status AND Terminal Status 2 = Terminal Connection Status

[0265] - Case 2: Base Station Status = Base Station General Status OR Terminal Status 1 = Terminal General Status OR Terminal Status 2 = Terminal Connection Status

[0266] And cases in which the terminal measurement status is determined to be in a relaxed state may include the following cases.

[0267] - Case 3: Base Station Status = Base Station Power Saving Status AND Terminal Status 1 = Terminal Power Saving Status AND Terminal Status 2 = Terminal Idle Status

[0268] - Case 4: Base Station Status = Base Station Power Saving Status OR Terminal Status 1 = Terminal Power Saving Status OR Terminal Status 2 = Terminal Idle Status

[0269] When the terminal determines that the terminal measurement state is a normal state (1250), the terminal performs a terminal measurement operation according to the normal state in step 1260. For example, the terminal may perform a measurement based on the number of measurement samples (N1) collected when the terminal performs a measurement operation corresponding to the normal state, the length of the measurement time interval (W1), the measurement frequency (F1), the minimum requirement (R1), etc.

[0270] When the terminal determines that the terminal measurement state is a relaxed state (1270), the terminal performs a terminal measurement operation according to the relaxed state in step 1280. For example, the terminal may perform measurements based on the number of measurement samples (N2) collected when the terminal performs a measurement operation corresponding to the measurement state being a relaxed state, the length of the measurement time interval (W2), the measurement frequency (F2), the minimum requirement (R2), etc.

[0271] Comparing the measurement conditions in the normal state and the relaxed state, the relationships are relatively N1 > N2, W1 < W2, and F1 > F2. In other words, in the normal state, measurement operations are performed relatively frequently. Furthermore, the normal state must satisfy relatively stricter minimum requirements than the relaxed state.

[0272] The number of measurement samples, the length of the measurement time interval, the measurement frequency, minimum requirements, etc., mentioned above can be set on the terminal by the base station. For example, the base station may set on the terminal a measurement setting including the number of measurement samples (N2), the length of the measurement time interval (W2), the measurement frequency (F2), and the minimum requirements (R2) corresponding to a relaxed state of the terminal measurement, and a measurement setting including the number of measurement samples (N1), the length of the measurement time interval (W1), the measurement frequency (F1), and the minimum requirements (R1) corresponding to a normal state of the terminal measurement.

[0273] Alternatively, parameters corresponding to the terminal measurement state may be predetermined. For example, when the terminal measurement state is in a relaxed state, a measurement setting including the number of measurement samples (N1), the length of the measurement time interval (W1), the measurement frequency (F1), and the minimum requirement (R1) corresponding to that state may be predetermined, and when the terminal measurement state is in a normal state, a measurement setting including the number of measurement samples (N1), the length of the measurement time interval (W1), the measurement frequency (F1), and the minimum requirement (R1) corresponding to that state may be predetermined.

[0274] After performing the above measurement operation, the terminal may report the measurement result to the base station. The base station may instruct the terminal to report the measurement result at a specific time, to report periodically, or to report when certain conditions are satisfied, through the report setting information transmitted to the terminal. Additionally, the base station may instruct the terminal to report the measurement result differently depending on the base station status, terminal status 1, terminal status 2, etc., through the report setting information.

[0275] The above measurement results may include various forms. For example, they may include RSRP, which indicates the received signal strength of the reference signal being measured, and RSRQ (Reference Signal Received Quality), which indicates the received signal quality as a ratio between the received signal strength of the reference signal being measured and the amount of interference.

[0276] Although the names of 5G systems have been used to describe the embodiments of the present disclosure, the names described above are merely examples and can be understood as messages that include information or perform the same role as described above.

[0277] FIG. 13 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.

[0278] Referring to FIG. 13, the terminal may be configured to include at least one of a transmitter (1304) composed of an uplink transmission processing block (1301), a multiplexer (1302), and a transmission RF block (1303), a receiver (1308) composed of a downlink reception processing block (1305), a demultiplexer (1306), and a reception RF block (1307), and a control unit (1309). The control unit (1309) can control each of the configuration blocks of the receiver (1308) 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 (1304) for transmitting an uplink signal.

[0279] In the transmission unit (1304) of the terminal, the uplink transmission processing block (1301) can generate a signal to be transmitted by performing processes such as channel coding and modulation. The signal generated in the uplink transmission processing block (1301) can be multiplexed with other uplink signals by a multiplexer (1302), then processed by a transmission RF block (1303), and then transmitted to a base station.

[0280] The receiving unit (1308) 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 (1305) 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 (1308) of the terminal can apply the output result of the downlink receiving processing block to the control unit (1309) to support the operation of the control unit (1309).

[0281] FIG. 14 is a block diagram showing an example of the configuration of a terminal according to one embodiment of the present disclosure.

[0282] As illustrated in FIG. 14, the terminal of the present disclosure may include at least one of a processor (1430), a transceiver (1410), or a memory (1420). 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 (1430), the transceiver (1410), and the memory (1420) may be implemented in the form of a single chip. According to one embodiment, the transceiver (1410) of FIG. 14 may include the transceiver (1304) and the receiver (1308) of FIG. 13. Additionally, the processor (1430) of FIG. 14 may include the control unit (1309) of FIG. 13.

[0283] According to one embodiment, the processor (1430) 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 or a terminal measurement according to the base station status signaling of the base station. The processor (1430) may include at least one processor, and the processor (1430) 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 (1420).

[0284] The transceiver (1410) 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 (1410) may be composed of an RF transmitter that up-converts and amplifies the frequency of a transmitted signal, and an RF receiver that low-noise amplifies a received signal and down-converts the frequency. However, this is merely an example of the transceiver (1410), and the components of the transceiver (1410) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1410) can receive a signal through a wireless channel and output it to a processor (1430), and transmit the signal output from the processor (1430) through a wireless channel.

[0285] According to one embodiment, the memory (1420) may store programs and data necessary for the operation of the terminal. Additionally, the memory (1420) may store control information or data included in signals transmitted and received by the terminal. The memory (1420) 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 (1420). According to one embodiment, the memory (1420) may store a program for performing the transmission and reception or terminal measurement operation of the terminal according to the base station status signaling of the base station, which is one of the embodiments of the present disclosure described above.

[0286] FIG. 15 is a block diagram showing an example of the configuration of a base station according to one embodiment of the present disclosure.

[0287] As illustrated in FIG. 15, the base station of the present disclosure may include at least one of a processor (1530), a transceiver (1510), or a memory (1520). 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 (1530), the transceiver (1510), and the memory (1520) may be implemented in the form of a single chip.

[0288] The processor (1530) 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 according to the base station status signaling of the base station. The processor (1530) may include at least one processor, and the processor (1530) can perform a method of scheduling a terminal according to the frequency instruction of the base station of the present disclosure described above by executing a program stored in memory (1520).

[0289] The transceiver (1510) can transmit and receive signals with a terminal. The signals transmitted and received with the terminal may include control information and data. The transceiver (1510) 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 (1510), and the components of the transceiver (1510) are not limited to an RF transmitter and an RF receiver. Additionally, the transceiver (1510) can receive a signal through a wireless channel and output it to a processor (1530), and transmit the signal output from the processor (1530) through a wireless channel.

[0290] According to one embodiment, the memory (1520) may store programs and data necessary for the operation of the base station. Additionally, the memory (1520) may store control information or data included in signals transmitted and received by the base station. The memory (1520) 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 (1520). According to one embodiment, the memory (1520) may store a program for performing a method of scheduling a terminal according to the base station status signaling of the base station, which is one of the embodiments of the present disclosure described above.

[0291] 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.

[0292] 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.

[0293] 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. A method performed by a terminal in a wireless communication system, A step of receiving, from a base station, first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state; A step of checking the base station status based on information received from the base station; A step of checking the terminal measurement status based on the above base station status and terminal status; A step of performing a measurement based on measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information; and A method characterized by including the step of transmitting a measurement result determined based on the above measurement to the base station.

2. In Paragraph 1, A method characterized in that information received from the base station is included in at least one of a synchronization signal, MIB (master information block), PBCH-DMRS (physical broadcast channel-demodulation reference signal), SIB (system information block), DCI (downlink control information), MAC CE (medium access control control element), and RRC (radio resource control).

3. In Paragraph 1, The first measurement state indicates that the terminal measurement state is in a normal state, and the second measurement state indicates that the terminal measurement state is in a relaxed state. The above first measurement setting information includes at least one of the number of measurement samples (N1), the length of the measurement interval (W1), and the measurement frequency (F1). The above second measurement setting information includes at least one of the number of measurement samples (N2), the length of the measurement interval (W2), and the measurement frequency (F2). A method characterized by satisfying N1 > N2, W1 < W2, F1 > F2.

4. In Paragraph 1, When the above terminal measurement state is in a normal state, It includes cases where the base station state is in a normal state and the terminal state is not in a power saving state and the terminal is in a connected state, or cases where the base station state is in a normal state or the terminal state is not in a power saving state or the terminal is in a connected state, and cases where the terminal measurement state is in a relaxed state, A method characterized by including cases where the base station state is a power saving state and the terminal state is a power saving state and the terminal is in an idle state, or cases where the base station state is a power saving state or the terminal state is a power saving state or the terminal is in an idle state.

5. In a method performed by a base station in a wireless communication system, A step of transmitting information related to the base station status to a terminal; A step of transmitting to the terminal first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state; and The method includes the step of receiving a result measured from the terminal based on measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information, and A method characterized in that the above terminal measurement state is determined based on the above base station state and terminal state.

6. In Paragraph 5, A method characterized in that information related to the base station status is included in at least one of a synchronization signal, MIB (master information block), PBCH-DMRS (physical broadcast channel-demodulation reference signal), SIB (system information block), DCI (downlink control information), MAC CE (medium access control control element), and RRC (radio resource control).

7. In Paragraph 5, The first measurement state indicates that the terminal measurement state is in a normal state, and the second measurement state indicates that the terminal measurement state is in a relaxed state. The above first measurement setting information includes at least one of the number of measurement samples (N1), the length of the measurement interval (W1), and the measurement frequency (F1). The above second measurement setting information includes at least one of the number of measurement samples (N2), the length of the measurement interval (W2), and the measurement frequency (F2). A method characterized by satisfying N1 > N2, W1 < W2, F1 > F2.

8. In Paragraph 5, When the above terminal measurement state is in a normal state, It includes cases where the base station state is in a normal state and the terminal state is not in a power saving state and the terminal is in a connected state, or cases where the base station state is in a normal state or the terminal state is not in a power saving state or the terminal is in a connected state, and cases where the terminal measurement state is in a relaxed state, A method characterized by including cases where the base station state is a power saving state and the terminal state is a power saving state and the terminal is in an idle state, or cases where the base station state is a power saving state or the terminal state is a power saving state or the terminal is in an idle state.

9. In a terminal of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The terminal is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, so that the terminal, Receive from a base station first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state, and Check the base station status based on information received from the above base station, and Based on the above base station status and terminal status, check the terminal measurement status, and A measurement is performed based on the measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information, and A terminal characterized by including a memory that stores a command to transmit a measurement result determined based on the above measurement to the base station.

10. In Paragraph 9, A terminal characterized by having information received from the above-mentioned base station included in at least one of a synchronization signal, MIB (master information block), PBCH-DMRS (physical broadcast channel-demodulation reference signal), SIB (system information block), DCI (downlink control information), MAC CE (medium access control control element), and RRC (radio resource control).

11. In Paragraph 9, The first measurement state indicates that the terminal measurement state is in a normal state, and the second measurement state indicates that the terminal measurement state is in a relaxed state. The above first measurement setting information includes at least one of the number of measurement samples (N1), the length of the measurement interval (W1), and the measurement frequency (F1). The above second measurement setting information includes at least one of the number of measurement samples (N2), the length of the measurement interval (W2), and the measurement frequency (F2). A terminal characterized by satisfying N1 > N2, W1 < W2, and F1 > F2.

12. In Paragraph 9, When the above terminal measurement state is in a normal state, It includes cases where the base station state is in a normal state and the terminal state is not in a power saving state and the terminal is in a connected state, or cases where the base station state is in a normal state or the terminal state is not in a power saving state or the terminal is in a connected state, and cases where the terminal measurement state is in a relaxed state, A terminal characterized by including cases where the base station state is a power saving state and the terminal state is a power saving state and the terminal is in an idle state, or cases where the base station state is a power saving state or the terminal state is a power saving state or the terminal is in an idle state.

13. In a base station of a wireless communication system, At least one transceiver; At least one processor connected to the above at least one transceiver so as to be able to communicate; and The base station is connected to communicate with at least one processor and is capable of executing individually or in any combination of the at least one processor, and, Transmits information related to the base station status to the terminal, and Transmitting first measurement setting information related to a first measurement state and second measurement setting information related to a second measurement state to the terminal, It includes a memory that stores a command to receive a result measured based on measurement setting information corresponding to the terminal measurement state among the first measurement setting information or the second measurement setting information from the terminal, and A base station characterized in that the above terminal measurement state is determined based on the above base station state and terminal state.

14. In Paragraph 13, The information related to the above base station status is included in at least one of the synchronization signal, MIB (master information block), PBCH-DMRS (physical broadcast channel-demodulation reference signal), SIB (system information block), DCI (downlink control information), MAC CE (medium access control control element), and RRC (radio resource control). When the above terminal measurement state is in a normal state, It includes cases where the base station state is in a normal state and the terminal state is not in a power saving state and the terminal is in a connected state, or cases where the base station state is in a normal state or the terminal state is not in a power saving state or the terminal is in a connected state. If the above terminal measurement state is in a relaxed state, A base station characterized by including cases where the base station state is a power saving state and the terminal state is a power saving state and the terminal is in an idle state, or cases where the base station state is a power saving state or the terminal state is a power saving state or the terminal is in an idle state.

15. In Paragraph 13, The first measurement state indicates that the terminal measurement state is in a normal state, and the second measurement state indicates that the terminal measurement state is in a relaxed state. The above first measurement setting information includes at least one of the number of measurement samples (N1), the length of the measurement interval (W1), and the measurement frequency (F1). The above second measurement setting information includes at least one of the number of measurement samples (N2), the length of the measurement interval (W2), and the measurement frequency (F2). A base station characterized by satisfying N1 > N2, W1 < W2, and F1 > F2.

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